AMS AS1331 Datasheet
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General Description
AS1331
300mA Buck-Boost Synchronous DC/DC
Converter
This special device is a synchronous buck-boost DC/DC converter which can handle input voltages above, below, or equal to the output voltage.
Due to the internal structure of the AS1331 which is working continuously through all operation modes this device is ideal for dual or triple cell alkaline/NiCd/NiMH as well as single cell
Li-Ion battery applications.
Because of the implemented Power Save Mode, the solution footprint and the component count is minimized and also over a wide range of load currents a high conversion efficiency is provided.
The device includes two N-channel MOSFET switches and two
P-channel switches. Also following features are implemented: a quiescent current of typically 22μA (ideal for battery power applications), a shutdown current less than 1μA, current limiting, thermal shutdown and output disconnect.
The AS1331 is available in a 10-pin 3x3mm TDFN package with fixed and adjustable output voltage.
and
Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1331, 300mA Buck-Boost
Synchronous DC/DC Converter are listed below:
Figure 1:
Added Value of Using AS1331
Benefits
•
Ideal for single Li-Ion battery powered applications
•
Supports a variety of end applications
•
Built-in self-protection
•
Small system area
Features
•
Input voltage range: 1.8V to 5.5V
•
Output voltage range: 2.5V to 3.3V
•
Output current: 300mA @ 3.3V
•
Automatic transition between buck and boost mode
•
Short-circuit protection
•
Overtemperature protection
•
Output disconnection in shutdown
•
10-pin 3x3mm TDFN package
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
General Description
Applications
The AS1331 is an ideal solution for handheld computers, handheld instruments, portable music players and PDA’s. Two and three cell Alkaline, NiCd or NiMH or single cell Li battery powered products.
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
Typical Application Diagram
L1
6.8µH
1.8V to 5.5V
C
1
10µF
R
4
R
5
On
Off
5
VIN
7
LBI
6
EN
4
SW1
2
SW2
AS1331-AD
8
LBO
1
VOUT
10
FB
3
PGND
9
GND
R
3
Low Battery Detect
R
1
R
2
C
2
22µF
V
OUT
2.5V to 3.3V
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AS1331 −
Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram (Top View)
VOUT 1
SW
2
2
PGND
3
SW1 4
VIN 5
AS1331
11
7
6
10
9
FB
GND
8
LBO
LBI
EN
Figure 4:
Pin Description
Pin Name
VOUT
SW1
PGND
SW2
VIN
EN
LBI
Pin Number
1
2
3
4
5
6
7
Description
Output of the Buck/Boost Converter.
Buck/Boost Switch Pin.
Connect the inductor from SW1 to SW2.
Power Ground.
Both GND pins must be connected.
Buck/Boost Switch Pin.
Connect the inductor from SW1 to SW2. An optional Schottky diode can be connected between this pin and
VOUT to increase efficiency.
Input Supply Pin.
A minimum 2.2μF capacitor should be placed between VIN and GND.
Enable Pin
. Logic controlled shutdown input.
1 = Normal operation
0 = Shutdown; quiescent current <1μA
VIN must be present and stable before EN operation is valid during start-up.
Low Battery Comparator Input
. 1.25V Threshold. May not be left floating. If connected to GND LBO is working as Output Power okay.
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Pin Assignment
Pin Name
LBO
GND
FB
NC
Pin Number
8
9
10
11
Description
Low Battery Comparator Output
. This open-drain output is low when the voltage on LBI is less than 1.25V.
Ground.
Both GND pins must be connected.
Feedback Pin
. Feedback input for the adjustable version. Connect a resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 3.3V by: V
OUT
= 1.25V[1 + (R
1
/R
2
)].
Exposed Pad.
This pad is not connected internally. It can be used for ground connection between GND and PGND.
Note(s):
1. For the fixed Output Voltage Version contact this pin to VOUT.
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AS1331 −
Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed in Absolute maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Figure 5:
Absolute Maximum Ratings
Parameter
SW1, SW2, VIN, VOUT, EN
PGND to GND
SW1, SW2
Electrostatic Discharge ESD
Thermal Resistance
θ
JA
Junction Temperature
Operating Temperature Range
Storage Temperature Range
Package Body Temperature
Relative humidity (non-condensing)
Moisture sensitivity level
Min
-0.3
-0.3
-0.3
±4
+33
150
Max
+7
+0.3
+7
-40
-65
85
125
5
260
1
85
Units
V kV
V
V
ºC/W
ºC
ºC
ºC
Notes
HBM MIL-Std. 883E 3015.7
methods
ºC
The reflow peak soldering temperature (body temperature) specified is in accordance with
IPC/JEDEC J-STD-020D
“Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin (100% Sn).
%
Unlimited floor life time
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Electrical Characteristics
AS1331 −
Electrical Characteristics
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
V
IN
= 3.6V, V
OUT
= 3.3V, T
AMB
= -40°C to 85ºC. Typical values are at T
AMB
= 25ºC. Unless otherwise specified.
Figure 6:
Electrical Characteristics
Symbol
V
IN
V
UV
V
OUT
V
FB
I
FB
IQ
I
SHDN
Parameter Conditions
Input
Input voltage range
Minimum startup voltage
I
LOAD
< 1mA
Undervoltage lockout
V
IN
decreasing
Regulation
Output voltage adjustable version
Output voltage 3.3V
Output voltage 3.0V
Quiescent current V
Quiescent current V
Shutdown current
IN
OUT
No Load
Output voltage 2.5V
FB voltage adjustable version
No Load
FB input current adjustable version
V
OUT
V
FB
= 1.3V, T
AMB
= 25°C
Rising Edge
Operating Current
V
IN
= 5V
V
IN
= 5V, V
OUT
= 3.6V,
V
FB
= 1.3V
EN = 0V, V
OUT
= 0V,
T
AMB
= 25ºC
Min
1.8
1.5
2.50
3.201
2.910
2.425
1.212
2.0
Typ
1.6
1.6
3.3
3.0
2.5
1.25
1
2.15
2
20
0.01
Max
5.5
1.8
1.7
3.30
3.399
3.090
2.575
1.288
100
2.3
6
32
1
Units
V
V
V nA
V
μA
μA
μA
V
V
V
V
V
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AS1331 −
Electrical Characteristics
Symbol
I
MOS
R
ON
I
PEAK
V
ENH
V
ENL
I
EN
V
LBI
Parameter
MOS switch leakage
NMOS B, C
PMOS A
PMOS D
Peak current limit
EN input high
EN input low
EN input current
LBI Threshold
LBI Hysteresis
LBI Leakage current
LBO Voltage low
LBO Leakage current
Power-OK threshold
Conditions
Switches
V
IN
= 5V, T
AMB
=25°C,
Switches A-D
V
IN
= 5V
V
IN
= 5V
V
OUT
= 3.3V
L = 6.8μH, V
IN
= 5V
Enable
Min
450
Typ
0.01
0.13
0.17
0.21
600
Max
1
750
1.4
LBI = 5.5V, T
AMB
= 25°C
I
LBO
= 1mA
LBO = 5.5V, T
AMB
= 25°C
LBI = 0V, falling edge
Thermal Protection
10°C hysteresis
90
145
0.4
100
EN = 5.5V, T
AMB
= 25°C
Low Battery and Power-OK
Falling Edge 1.212
1
1.25
10
1
0.05
1
92.5
1.288
100
0.2
100
95
Units
V nA
%
V mV nA
μA
Ω
Ω
Ω mA
V
V nA
°C Thermal shutdown
Note(s):
1. If the input voltage falls below this value during normal operation the device goes in startup mode.
2. The regulator is in startup mode until this voltage is reached. Caution: Do not apply full load current until the device output > 2.3V.
3. LBO goes low in startup mode as well as during normal operation if:
1) The voltage at the LBI pin is below LBI threshold.
2) The voltage at the LBI pin is below 0.1V and V
OUT
is below 92.5% of its nominal value.
ams Datasheet
[v1-06] 2015-Dec-07
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Typical Operating
Characteristics
AS1331 −
Typical Operating Characteristics
Circuit of
IN
= 2.4V, V
OUT
= 3.3V, T
AMB
= 25°C, unless otherwise specified.
Figure 7:
Efficiency vs. Output Current; V
OUT
= 2.5V
100
90
80
70
60
50
40
30
0.1
1 10 100
Output Current (mA)
Vi n = 1.8V
Vi n = 3.6V
Vi n = 5.5V
1000
Figure 8:
Efficiency vs. Output Current; V
OUT
= 3.0V
100
90
80
70
60
50
40
30
0.1
1 10 100
Output Current (mA)
Vi n = 1.8V
Vi n = 3.6V
Vi n = 5.5V
1000
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AS1331 −
Typical Operating Characteristics
Figure 9:
Efficiency vs. Output Current; V
OUT
= 3.3V
100
90
80
70
60
50
40
30
0.1
1 10 100
Output Current (mA)
Vi n = 1.8V
Vi n = 3.6V
Vi n = 5.5V
1000
Figure 10:
Efficiency vs. Input Voltage
100
90
80
70
60
50
Iout = 10mA
40
Iout = 100mA
Iout = 300mA
30
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
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AS1331 −
Typical Operating Characteristics
Figure 11:
I
OUT
Max vs. Input Voltage
500
400
300
200
100
0
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V)
Figure 12:
Sleep Currents vs. Input Voltage
30
25
20
15
I
VOUT
10
5
I
VIN
0
1.8 2.2
2.6 3.0 3.4
3.8 4.2
4.6 5.0 5.4
Input Voltage (V)
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 −
Typical Operating Characteristics
Figure 13:
I
IN
Short Circuit vs. Input Voltage
30
25
20
15
10
5
0
1.8 2.2
2.6 3.0 3.4
3.8 4.2
4.6 5.0 5.4
Input Voltage (V)
Figure 14:
V
OUT
Ripple vs. Input Voltage
250
200
150
100
50
10uF / Vpp
22uF / Vpp
47uF / Vpp
0
1.5
2 2.5
3 3.5
4 4.5
5 5.5
Input Voltage (V)
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Typical Operating Characteristics
Figure 15:
Load Regulation vs. Load Current
3.38
3.36
3.34
3.32
3.3
3.28
3.26
3.24
0.1
1 10 100
Load Current (mA)
Vout - 10uF
Vout - 22uF
Vout - 47uF
1000
Figure 16:
V
OUT
Regulation vs. Temperature
3.5
3.25
3
2.75
2.5
2.25
V
OUT
= 3.3V
V
OUT
= 3.0V
V
OUT
= 2.5V
2
-45 -30 -15 0 15 30 45 60 75 90
Temperature (°C)
ams Datasheet
[v1-06] 2015-Dec-07
AS1331 −
Typical Operating Characteristics
Figure 17:
I
FB
vs. Temperature; V
IN
= 5V
0.4
0.3
0.2
0.1
0
-0.1
3.6V
5.0V
5.5V
-0.2
-45 -30 -15 0 15 30 45 60 75 90
Temperature (°C)
Figure 18:
EN Pin Threshold
1
0.9
0.8
0.7
up-ON down-OFF
0.6
-45 -30 -15 0 15 30 45 60 75 90
Temperature (°C)
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Typical Operating Characteristics
Figure 19:
V
IN
= 4.4V, V
OUT
= 3.3V, I
OUT
= 200mA
5µs/Div
Figure 20:
V
IN
= 4.4V, V
OUT
= 3.3V, I
OUT
= 50mA
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5µs/Div
ams Datasheet
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AS1331 −
Typical Operating Characteristics
Figure 21:
V
IN
= 3.6V, V
OUT
= 3.3V, I
OUT
= 200mA
5µs/Div
Figure 22:
V
IN
= 3.6V, V
OUT
= 3.3V, I
OUT
= 50mA ams Datasheet
[v1-06] 2015-Dec-07
5µs/Div
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AS1331 −
Typical Operating Characteristics
Figure 23:
V
IN
= 2.5V, V
OUT
= 3.3V, I
OUT
= 200mA
5µs/Div
Figure 24:
V
IN
= 2.5V, V
OUT
= 3.3V, I
OUT
= 50mA
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5µs/Div
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AS1331 −
Typical Operating Characteristics
Figure 25:
Shorted Output; V
IN
= 3.6V
ams Datasheet
[v1-06] 2015-Dec-07
1µs/Div
Figure 26:
Startup; V
IN
= 3.6V, R load
= 3.3k
Ω
500µs/Div
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Detailed Description
Figure 27:
Block Diagram - Fixed Output Voltage
AS1331 −
Detailed Description
The synchronous buck-boost converter AS1331 uses a Power
Save Mode control technique to reach a high efficiency over a wide dynamic range of load currents. The output voltage is monitored by a comparator with 3% accuracy. The Power Save
Mode puts the device into “sleep mode” when V
OUT
is above its programmed reference threshold. Meaning, the switching is stopped and only quiescent current is drawn from the power source. The switching is started again when V
OUT
drops below the reference threshold and the output capacitor is charged again.
The numbers of current pulses which are necessary to load the output capacitor are set by the value of the output capacitor, the load current, and the comparator hysteresis (~1%).
SW1
SW A
VIN
600mA
Peak
Current
Limit
AS1331
SW B
State
Machine and
Logic
EN
VIN
1.6V
UVLO
Shutdown Thermal Shutdown
Gate Drivers and
Anticross
Conduction
V
BEST
SW C
V
BEST
V
OUT
Comp
SW2
SW D
IZERODetect
1.25V
R1
VIN
VOUT
VOUT
R2
FB
PGND
GND
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AS1331 −
Detailed Description
Modes of Operation
When V
OUT
drops below the reference threshold, the AS1331 switches on the transistors SW A and SW C until the inductor current reaches approximately 400mA. In the next step SW A and SW D are closed and depending on the difference between
V
IN and V
OUT
the inductor current raises, falls or stays constant.
•
V
IN
> V
OUT
: The inductor current is going up to 600mA.
•
V
IN
~ V
OUT
: The device stops after 2μs.
•
V
IN
< V
OUT
: The inductor current falls down to 0mA.
If the inductor current is not 0mA, the transistors SW B and SW
D are closed to ramp down the current to zero. If V
OUT
is still below the threshold voltage the next cycle is started. If I
MAX
(600mA) wasn’t reached in the previous cycle, SW A and SW D are closed until the inductor current is 600mA.
Note(s):
The 4-switch-mode
(SW A+SW C => SW B+SW D => SW A + SW C...) and also the buck-mode (SW A+SW D => SW B+SW D => SW A+SW D...) are never used.
Start-Up Mode
At start-up the switch SW D is disabled and its diode is used to transfer current to the output capacitor until V
OUT reaches approximately 2.15V. The inductor current is controlled by an alternate algorithm during start-up.
Note(s):
Do not apply loads >1mA until V
OUT
= 2.3V is reached.
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AS1331 −
Detailed Description
Other AS1331 Features
Shutdown
The part is in shutdown mode while the voltage at pin EN is below 0.4V and is active when the voltage is higher than 1.4V.
EN operation during start-up is valid only after V
IN
is present and stable. Do not connect EN directly to V
IN
as this does not ensure reliable start-up of the regulator.
Note(s):
EN can be driven above V
IN
or V
OUT
, as long as it is limited to less than 5.5V.
In start-up enable pin must be pulled up after VIN is settled.
Recommended delay is 100
μ s between EN and VIN.
Figure 28:
AS1331 Start-Up Sequence
V
VIN
EN t
Output Disconnect and Inrush Limiting
During shutdown V
OUT
is going to 0V so that no current from the input source is running thru the device. The inrush current is also limited at turn-on mode to minimize the surge currents seen by the input supply. These features of the AS1331 are realized by opening both P-channel MOSFETs of the rectifiers, allowing a true output disconnect.
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AS1331 −
Detailed Description
Power-OK and Low-Battery-Detect Functionality
LBO goes low in startup mode as well as during normal operation if:
•
The voltage at the LBI pin is below LBI threshold (1.25V).
This can be used to monitor the battery voltage.
•
LBI pin is connected to GND and V
OUT
is below 92.5% of its nominal value. LBO works as a power-OK signal in this case.
The LBI pin can be connected to a resistive-divider to monitor a particular definable voltage and compare it with a 1.25V internal reference. If LBI is connected to GND an internal resistive-divider is activated and connected to the output.
Therefore, the Power-OK functionality can be realized with no additional external components.
The Power-OK feature is not active during shutdown and provides a power-on-reset function that can operate down to
V
IN
= 1.8V. A capacitor to GND may be added to generate a power-on-reset delay. To obtain a logic-level output, connect a pull-up resistor from pin LBO to pin V
OUT
. Larger values for this resistor will help to minimize current consumption; a 100k
Ω resistor is perfect for most applications
For the circuit shown in the left of
current into LBI is very low, permitting large-value resistor-divider networks while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a defined resistor for R
5
and then calculate R
4
as:
(EQ1)
R
4
= R
5
⋅
V
------------
V
LBI
–
1
Where:
V
LBI
(the internal sense reference voltage) is 1.25V.
In case of the LBI pin is connected to GND, an internal resistor-divider network is activated and compares the output voltage with a 92.5% voltage threshold. For this particular
Power-OK application, no external resistive components are necessary.
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[v1-06] 2015-Dec-07
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Figure 29:
Li-Ion to Adjustable Output Voltage
AS1331 −
Detailed Description
Thermal Shutdown
To prevent the AS1331 from short-term misuse and overload conditions the chip includes a thermal overload protection. To block the normal operation mode all switches will be turned off. The device is in thermal shutdown when the junction temperature exceeds 145°C. To resume the normal operation the temperature has to drop below 135°C.
A good thermal path has to be provided to dissipate the heat generated within the package. Otherwise it’s not possible to operate the AS1331 at its usable maximal power. To dissipate as much heat as possible away from the package into a copper plane with as much area as possible, it’s recommended to use multiple vias in the printed circuit board. It’s also recommended to solder the Exposed Pad (pin 11) to the GND plane.
Note(s):
Continuing operation in thermal overload conditions may damage the device and is considered bad practice.
Output Voltage Selection
The AS1331 is available in two versions
Information . One version can only operate at one fixed output
voltage
and the other version can operate with user-adjustable output voltages from 2.5V to 3.3V by connecting a voltage divider between the pins V
OUT
and FB
Li-Ion Battery
C
1
10µF
L1
6.8µH
R
4
R
5
On
Off
5
VIN
7
LBI
6
EN
4
SW1
2
SW2
AS1331-AD
8
LBO
1
VOUT
10
FB
3
PGND
9
GND
R
3
R
1
R
2
C
2
22µF
V
OUT
2.5V to 3.3V
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AS1331 −
Detailed Description
The output voltage can be adjusted by selecting different values for R1 and R2.
Calculate V
OUT
by:
(EQ2)
V
OUT
= V
FB
×
1 +
R
------
R
2
Where:
VFB = 1.25V, V
OUT
= 2.5V to 3.3V;
R
2
(the predefined resistor in the resistor divider) should be
≤
270k
Ω
.
R
3
(the Pull-up resistor for the LBO pin) should be ~100k
Ω
.
Figure 30:
Li-Ion to 3.3V with POK - Fixed Output Voltage
L1
6.8µH
Li-Ion Battery
C
1
10µF
On
Off
5
VIN
7
LBI
6
EN
4
SW1
2
SW2
AS1331-3.3V
8
LBO
1
VOUT
10
FB
3
PGND
9
GND
R
3
C
2
22µF
V
OUT
3.3V
300mA
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[v1-06] 2015-Dec-07
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AS1331 −
Application Information
Application Information
Component Selection
Only three power components are required to complete the design of the buck-boost converter. For the adjustable version
V
OUT
programming resistors are needed. The high operating frequency and low peak currents of the AS1331 allow the use of low value, low profile inductors and tiny external ceramic capacitors.
Inductor Selection
For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. The inductor should have low DCR (DC resistance) to reduce the I²R losses, and must be able to handle the peak inductor current without saturating. A 6.8μH inductor with a >600mA current rating and
<400m
Ω
DCR is recommended.
Figure 31:
Recommended Inductors
Part Number
LPS3015-682M
EPL2014-682M
XPL2010-682M
L
6.8μH
6.8μH
6.8μH
DCR
300m
Ω
287m
Ω
336m
Ω
Current
Rating
0.89A
0.80A
0.73A
Dimensions
(L/W/T)
3.0x3.0x1.5mm
2.0x2.0x1.4mm
2.0x1.9x1.0mm
Manufacturer
Coilcraft www.coilcraft.com
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AS1331 −
Application Information
Capacitor Selection
The buck-boost convertor requires two capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage over temperature. The V
IN capacitor should be at least 2.2μF. The V
OUT
capacitor should be between 10μF and 47μF. A larger output capacitor should be used if lower peak to peak output voltage ripple is desired.
A larger output capacitor will also improve load regulation on
V
OUT
. See
Figure 32 for a list of capacitors for input and output
capacitor selection.
Figure 32:
Recommended Input Capacitor
Part Number
GRM188R61A225KE34
GRM188R60J475KE19
GRM219R60J106KE19
C
2.2μF
4.7μF
10μF
Figure 33:
Recommended Output Capacitor
TC
Code
X5R
X5R
X5R
Rated
Voltage
10V
6.3V
6.3V
Part Number
GRM21BR61A106KE19
GRM319R61A106KE19
GRM319R61A106KE19
GRM31CR61C226KE15
GRM31CR60J475ME19
C
10μF
10μF
10μF
22μF
47μF
TC
Code
X5R
X5R
X5R
X5R
X5R
Rated
Voltage
10V
10V
10V
16V
6.3V
Dimensions
(L/W/T)
0603, T=0.87mm
0603, T=0.87mm
0805, T=0.95mm
Manufacturer
Murata www.murata.com
Dimensions
(L/W/T)
0805, T=1.35mm
1206, T=0.95mm
1210, T=0.95mm
1206, T=1.8mm
1206, T=1.75mm
Manufacturer
Murata www.murata.com
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Pack age Drawings & Mark ings
Package Drawings & Markings
The device is available in a 10-pin 3x3mm TDFN package.
Figure 34:
10-Pin 3x3mm TDFN Package Diagram
RoHS
Green
Note(s):
1. Dimensioning and tolerancing conform to ASME Y14.5M-1994.
2. All dimensions are in millimeters (angles are in degrees).
3. Coplanarity applies to the exposed heat slug as well as the terminal.
4. Radius on terminal is optional.
5. N is the total number of terminals.
Symbol Min
A
A1
A3
L
D2
E2 aaa bbb ccc ddd eee
N
E e b
D
0.70
0
0.30
0.18
2.23
1.49
-
-
-
-
-
Typ
2.38
1.64
0.15
0.10
0.10
0.05
0.08
10
0.75
0.02
0.20 REF
0.40
0.25
3.00 BSC
3.00 BSC
0.50 BSC
Max
0.80
0.05
0.50
0.30
2.48
1.74
-
-
-
-
-
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AS1331 −
Package Drawings & Markings
Figure 35:
Package Marking
ASRx
YYWW
QZZ
Note(s):
1. Where x can be P, U, T, R.
Figure 36:
Package Code
YY
Manufacturing year
WW
Manufacturing week
Q
Plant’s identifier
ZZ
Letters of free choice
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Ordering & Contac t Information
Ordering & Contact Information
The device is available as the standard products shown in
Figure 37:
Ordering Information
Ordering Code Package
AS1331-BTDT-AD
AS1331-BTDT-25
AS1331-BTDT-30
AS1331-BTDT-33
10-pin 3x3mm
TDFN
10-pin 3x3mm
TDFN
10-pin 3x3mm
TDFN
10-pin 3x3mm
TDFN
Marking Output
ASRP
ASRR
ASRT
ASRU
Adjustable
2.5V
3.0V
3.3V
Delivery
Form
Tape & Reel
Delivery Quantity
1000 pcs/reel
Tape & Reel
Tape & Reel
Tape & Reel
1000 pcs/reel
1000 pcs/reel
1000 pcs/reel
Note(s):
1. On request.
Buy our products or get free samples online at: www.ams.com/ICdirect
Technical Support is available at: www.ams.com/Technical-Support
Provide feedback about this document at: www.ams.com/Document-Feedback
For further information and requests, e-mail us at: [email protected]
For sales offices, distributors and representatives, please visit: www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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ams Datasheet
[v1-06] 2015-Dec-07
AS1331 −
RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS:
The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br):
ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous material).
Important Information:
The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
ams Datasheet
[v1-06] 2015-Dec-07
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Copyrights & Disclaimer
AS1331 −
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141
Unterpremstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. This product is provided by ams AG “AS IS” and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services.
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ams Datasheet
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AS1331 −
Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
Product Status
Pre-Development
Pre-Production
Production
Discontinued
Definition
Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice
Information in this datasheet is based on products in the design, validation or qualification phase of development.
The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice
Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of
Trade
Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and should not be used for new designs
ams Datasheet
[v1-06] 2015-Dec-07
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AS1331 −
Revision Information
Revision Information
Changes from 1.4 (2010) to current revision 1-06 (2015-Dec-07)
1.4 (2010) to 1-05 (2015-Dec-02)
Content was updated to the latest
ams
design
Added benefits to Key Features
Updated Other AS1331 Features section
Updated Package Drawings & Markings section
1-05 (2015-Dec-02) to 1-06 (2015-Dec-07)
Updated Figure 34
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
Page
1
20
26
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AS1331 −
Content Guide
Content Guide
1 General Description
1 Key Benefits & Features
2 Applications
2 Block Diagram
3 Pin Assignment
5 Absolute Maximum Ratings
6 Electrical Characteristics
8 Typical Operating Characteristics
18 Detailed Description
19 Modes of Operation
19 Start-Up Mode
20 Other AS1331 Features
21 Power-OK and Low-Battery-Detect Functionality
22 Thermal Shutdown
22 Output Voltage Selection
24 Application Information
24 Component Selection
24 Inductor Selection
25 Capacitor Selection
26 Package Drawings & Markings
28 Ordering & Contact Information
29 RoHS Compliant & ams Green Statement
30 Copyrights & Disclaimer
31 Document Status
32 Revision Information
ams Datasheet
[v1-06] 2015-Dec-07
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