AMS AS1382 Datasheet
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General Description
AS1382
1A, High Efficiency, DC-DC Step Down
Converter
The AS1382 is a high-efficiency, constant-frequency synchronous buck converter available in adjustabe- and fixed-voltage versions. The wide input voltage range (2.7V to
5.5V), automatic powersave mode and minimal external component requirements make the AS1382 perfect for any single Li-Ion battery-powered application.
Typical supply current with no load is 95μA and decreases to
0.04μA in shutdown mode.
An internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The internally fixed switching frequency (2MHz, 3MHz or 4MHz) allows the usage of small surface mount external components.
Very low output voltages can be delivered with the internal
0.58V feedback reference voltage.
The AS1382 is available in a 6-pin WL-CSP package.
appear at end of datasheet.
Key Benefits & Features
The benefits and features of this device are listed below:
Figure 1:
Added Value of Using AS1382
Benefits
• Ideal for single Li-Ion battery powered applications
• Extended battery life
• Supports a variety of end applications
• Over – temperature protection and shutdown
• Cost effective, small package
Features
• Wide input voltage range (2.7V to 5.5V)
• High efficiency up to 96%
• Output voltage range (0.58V to 3.35V)
• Output current of 1A
• Switching frequency: 2MHz, 3MHz, 4MHz
• High efficiency/low noise operation
• Integrated temperature monitoring
• WL-CSP6 with 0.4mm pitch
ams Datasheet
[v1-05] 2016-Oct-25
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AS1382 − General Description
Applications
The device is ideal for mobile communication devices, laptops and PDAs, ultra-low-power systems, medical instruments, or any other space-limited application with low power-consumption requirements.
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
Functional Blocks of AS1382
MODE
EN
Clk
Ref + 8%
Overvoltage
-
Σ
+
Logic
I
MIN
-
-
I
LIMIT
250mA
1.2A
I
SENSEP
VIN
SW
I
SENSEN
GND
Skip
Ref = 0.58V
buck_v
FB
Softstart
Block Diagram: Shows the detailed Block Diagram of the AS1382 Step Down DCDC Converter
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AS1382 − Pin Assignments
Pin Assignments
Ball Assignments: Shows the TOP view ball assignment of the AS1382.
Figure 3:
6 Balls WL-CSP with 0.4mm Pitch
Pin A1 indicator
B1
SW
C1
FB
A1
MODE
A2
VIN
B2
EN
C2
GND
Figure 4:
Pin Description
Pin # Pin Name Pin Type
A1 MODE DIG IN
B1
C1
A2
B2
C2
SW
FB
VIN
EN
GND
DIG OUT
ANA IN
SUP IN
DIG IN
GND
Description
Mode Selection
Switch Node Connection to Coil. This pin connects to the drains of the internal synchronous power MOSFET switches.
Feedback Pin. This pin receives the feedback voltage from the external resistor divider across the output. (Adjustable variant only)
Output Voltage Feedback Pin. An internal resistor divider steps the output voltage down for comparison to the internal reference voltage. (Fixed voltage variants only)
Input Supply Voltage. This pin must be closely de-coupled to GND with a ≥ 4.7μF ceramic capacitor. Connect to any supply voltage
Enable Input. Driving this pin above 1.2V enables the device. Driving this pin below 0.4V puts the device in shutdown mode. In shutdown mode all functions are disabled while SW goes high impedance, drawing < 1μA supply current.
Ground
Pin Description: Shows the pin number, type, name and description of every pin.
Note(s):
1. This pin should not be left floating.
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AS1382 − Absolute Maximum R atings
Absolute Maximum Ratings
Stresses beyond those listed under
may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Figure 5:
Absolute Maximum Ratings
Symbol
V
GND
P
T
ESD
HBM
T
A
R
THJA
T
J
T
STRG
T
BODY
RH
NC
MSL
Parameter Min Max Units
Electrical Parameters
Comments
Supply Voltage to Ground 5V pins -0.5
7.0
V
Input Current (latch-up immunity) -100 100 mA
Continuous Power Dissipation (T
A
= 70°C)
Applicable for pins VIN, EN,
MODE, FB, SW
Norm: JEDEC JESD78
Continuous power dissipation 0.55
W
P
T
(R
THJA
~95K/W)
Electrostatic Discharge HBM
Electrostatic Discharge
±2 kV
Temperature Ranges and Storage Conditions
-40 85 °C Operating Temperature
Junction to Ambient Thermal
Resistance
Junction Temperature
95
125
°C/W
°C
Storage Temperature Range -55 125 °C
Norm:
JEDEC JESD22-A114F
Package Body Temperature 260 °C
Norm: IPC/JEDEC
Relative Humidity non-condensing
Moisture Sensitivity Level
5
1
85 %
Represents an unlimited floor life time
Note(s):
1. Depending on actual PCB layout and PCB used
2. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Nonhermetic Solid State Surface Mount Devices”
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AS1382 − Electrical Characteristics
Electrical Characteristics
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
Figure 6:
Electrical Characteristics
Symbol Parameter Note Min
I
SUP_DCDC
V
I
V
V
I
V
IN
FB
FB
OUT
OUT_TOL
I
R
R
I
η
EFF
LNR
LDR
LIMIT
LOAD
T_COMP
PMOS
NMOS
V
IH
V
IL
Input Voltage
Current Consumption
Feedback Current
Logic in threshold
Pin VIN
Operating Current without Load
Shutdown Current
T
AMB
= 25°C pin EN, MODE
2.7
Feedback Voltage
Regulated Output Voltage
Output Voltage Tolerance
Efficiency
ADJ variant
Fixed V
OUT variant
ADJ variant
Fixed output variants, min. 40mV see figures below
0.56
0.6125
0.58
-3
Output Voltage Line Regulation Vin = 2.7V to 5.5V
Output Voltage Load Regulation
I
OUT
= 0 to 100mA
Peak Coil Current
Load Current
I
OUT
= 1A
V
OUT
≤ 1.8V
V
OUT
> 1.8V
Min load to guarantee correct output voltage in high temp
P-Channel FET R
DS(ON)
I
LSW
= 100mA
N-Channel FET R
DS(ON)
I
LSW
= -100mA
0
0
1.2
f
SW
Switching Frequency
Variant A
Variant B
Variant C
Typ
95
0.04
1
0.58
0.1
0.02
1.5
20
0.25
0.25
4
3
2
Max
5.5
30
0.60
3.35
3.35
3
96
1
0.7
0.55
0.55
0.4
Unit
V
μA
Ω
V
V
MHz
MHz
MHz
A
A
A
%
%/V
%/mA nA
V
V
V
%
μA
Ω
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AS1382 − Electrical Characteristics
Symbol
T
SHDN
ΔT
SHDN
Parameter
Thermal Shutdown
Thermal Shutdown Hysteresis
Note Min Typ
160
25
Max
Electrical Characteristics: Shows the Electrical Characteristics of the DCDC Converter. V
IN
= EN = 3.7V,
V
OUT
< V
IN
– 0.5V, T
AMB
= –40 to 85°C (unless otherwise specified)
Note(s):
1. Guaranteed per design
Unit
°C
°C
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AS1382 − Typical Operating Characteristics
Typical Operating
Characteristics
Figure 7:
Efficiency vs. Output Current for Various Output Voltages
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
Iload [A]
0.1
Vout=1.0V, M1, 4MHz
Vout=1.0V, M0, 4MHz
Vout=1.2V, M1, 2MHz
Vout=1.2V, M0, 2MHz
1
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
Iload [A]
0.1
Vout=1.8V, M1, 3MHz
Vout=1.8V, M0, 3MHz
Vout=3.3V, M1, 4MHz
Vout=3.3V, M0, 4MHz
1
Efficiency vs. Output Current: These figures show the Efficiency vs. Output Current for various Output Voltages.
V
IN
= 3.6V, T
AMB
= 25°C. Murata LQM2HPN1R0MG0 coil (1uH, DCR 55mΩ).
Figure 8:
Efficiency vs. Output Current for Various Input Voltages
Efficiency vs. Output Current: These figures show the Efficiency vs. Output
Current for various Input Voltages.
V
OUT
= 1.0V, T
AMB
= 25°C, 4MHz.
Murata LQM2HPN1R0MG0 coil
(1uH, DCR 55mΩ).
100
90
80
70
60
50
40
30
20
10
0
0.0010
0.0100
Iload [A]
0.1000
Vin=2.7V, M1
Vin=3.7V, M1
Vin=5.5V, M1
Vin=2.7V, M0
Vin=3.7V, M0
Vin=5.5V, M0
1.0000
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Efficiency vs. Input Voltage: These figures show the Efficiency vs. Input
Voltage for various Load Currents.
V
OUT
= 1.2V, T
AMB
= 25°C, 2MHz.
Murata LQM2HPN1R0MG0 coil
(1uH, DCR 55mΩ).
AS1382 − Typical Operating Characteristics
Figure 9:
Efficiency vs. Input Voltage for Various Load Currents
100
90
80
70
60
50
40
30
20
10
0
2.5000
3.0000
3.5000
4.0000
Vin [V]
4.5000
Iload=50mA, M0
Iload=500mA, M0
Iload=50mA, M1
Iload=500mA, M1
5.0000
5.5000
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AS1382 − Detailed Description
Detailed Description
The step-down converter is a high efficiency fixed frequency current mode regulator. By using low resistance internal PMOS and NMOS switches efficiency up to 96% can be achieved. The fast switching frequency allows using small inductors, without increasing the current ripple. The unique feedback and regulation circuit guarantees optimum load and line regulation over the whole output voltage range, up to an output current of 1A with an output capacitor of only 10
µF. The implemented current limitation protects the DCDC and the coil during overload condition.
Mode Settings
Low-Ripple, Low-Noise Operation
MODE pin = high
In this mode there is no minimum coil current necessary before switching OFF the PMOS. As result, the ON time of the PMOS will be reduced down to tmin_on at no or light load conditions, even if the coil current is very small or the coil current is inverted. This results in a very low ripple and noise, but decreased efficiency, at light loads, especially at low input to output voltage differences. Because of the inverted coil current in that case the regulator will not operate in pulse skip mode.
Figure 10:
AS1382 Low Noise Mode
coil current (200mA/div)
LX (2V/div)
VOUT (50mV/div) time (5us/div)
DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for low noise operation
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AS1382 − Detailed Description
High-Efficiency Operation
MODE pin = low
In this mode there is a minimum coil current necessary before switching OFF the PMOS. As result there are less pulses at low output load necessary, and therefore the efficiency at low output load is increased. This results in higher ripple, and noisy pulse skip operation up to a higher output current.
Figure 11:
AS1382 High Efficiency Mode
coil current (200mA/div)
LX (2V/div)
VOUT (50mV/div) time (20us/div)
DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for high efficiency operation
It is also possible to switch between these two modes during operation.
For Example:
MODE pin = low: System is in idle state. No audio, RF signal.
Decreased supply current preferred. Increased ripple doesn’t affect system performance.
MODE pin = high: System is operating. Audio signal on and/or
RF signal used. Decreased ripple and noise preferred. Increased power supply current can be tolerated.
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AS1382 − Application Information
Application Information
The AS1382 is perfect for mobile communications equipment like cell phones and smart phones, digital cameras and camcorders, portable MP3 and DVD players, PDA’s and palmtop computers and any other handheld instruments.
Figure 12:
Typical Application Circuit
V
IN
2.7V to 5.5V
C
IN
4.7uF
VIN
EN
MODE
AS1382-12
SW
FB
GND
1uH
C
OUT
10uF
V
OUT
1.2V, 1A
Typical Application: This figure shows the typical application of the DCDC Step Down Converter.
External Components
Inductors
Figure 13:
Recommended Inductors
Part Number
XFL4020-102
LQM2HPN1R0MG0
L
1uH
1uH
DCR
12mΩ
55mΩ
Current
Rating
4.5A
1.6A
Dimensions
(L/W/H)
4.3/4.3/2.1
2.5/2.0/0.9
Manufacturer
www.coilcraft.com
www.murata.com
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AS1382 − Application Information
Ceramic Input and Output Capacitors
When choosing ceramic capacitors for C
IN
and C
OUT
, the X5R or
X7R dielectric formulations are recommended. These dielectrics have the best temperature and voltage characteristics for a given value and size. Y5V and Z5U dielectric capacitors, aside from their wide variation in capacitance over temperature, become resistive at high frequencies and therefore should not be used.
Figure 14:
Recommended Input and Output Capacitors
Part Number
GRM21BR61E475KA12L
GRM219R60J106KE19D
C
4.7μF
10μF
TC
Code
X5R
X5R
Voltage
Rating
25V
6.3V
Dimensions
(L/W/H)
0805
0805
Manufacturer
www.murata.com
www.murata.com
Because ceramic capacitors lose a lot of their initial capacitance at their maximum rated voltage, it is recommended that either a higher input capacity or a capacitance with a higher rated voltage is used.
Feedback Resistor Selection
In the AS1382-AD, the output voltage is set by an external resistor divider connected to FB . This circuitry allows for remote voltage sensing and adjustment.
Figure 15:
Adjustable Variant
AS1382-AD
SW
FB
GND
1uH
R1
R2
C
OUT
10uF
0.58V ≤ V
OUT
≤ 3.35V
AS1382-AD: Shows the application diagram for the adjustable output version with the external resistor divider
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AS1382 − Application Information
The Resistor values for the circuit shown above can be calculated with the following equation:
(EQ1)
V
OUT
= V
FB
×
1 +
1
R
2
The output voltage can be adjusted by selecting different values for R1 and R2. For R2 a value between 10k
Ω and 50kΩ is recommended. To minimize current to FB pin it is recommended to keep sum of R
1
and R
2
below 100 k
Ω. It is also recommended to keep V
IN
500mV higher than V
OUT
.
An optional feedback capacitor (C
FB
) can be added in parallel with R
1
to reduce output ripple. Typical value for the C
FB
is below 300pF
PCB Layout
Long printed circuit tracks can generate additional ripple and noise that mask correct operation and prove difficult to
“de-bug” during production testing. Thus the input loop formed by C
IN
, V
IN
and GND pins should be minimized. Similarly, the output loop formed by C
OUT
, VOUT and GND should also be minimized.
Figure 16 shows a PCB layout example for the
AS1382.
Figure 16:
PCB Layout Example For The Adjustable Variant
Mode
Vin
L
1 uH
2.5mm x 2.0mm
A1
SW
B1
A2
B2
C1 C2
Cin
4.7 uF
1.6mm x
0.8mm
FB
Cout
10 uF
1.6mm x 0.8mm
GND
R1
R2
Vout
En
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Package Drawings & Markings
Figure 17:
6 Balls WL-CSP With 0.4mm Pitch
AS1382 − Pack age Drawings & Mark ings
Note(s):
1. Pin 1 = A1
2. ccc Coplanarity
3. All dimensions are in
μm
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RoHS
Green
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AS1382 − Package Drawings & Markings
AS1382 Marking: Shows the package marking of the WL-CSP product version
Figure 18:
WL-CSP Marking
Figure 19:
Package Code
YYY
Marking code
XXXX
Tracecode
AS1382 Package Code: Shows the package code of the WL-CSP product version
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AS1382 − Ordering & Contac t Information
Ordering & Contact Information
Figure 20:
Ordering Information
Ordering Code
AS1382-BWLT-ES
AS1382C-BWLT-AD
AS1382A-BWLT-AD
AS1382C-BWLT-18
Marking
ABZ
AA6
ACD
AA7
ABW
ABX
ABY
Output Description
Adjustable
Adjustable
1.0V
1.2V
1.5V
1.8V
Manually programmed engineering sample
2MHz, 1A Synchronous
DCDC Converter
4MHz, 1A Synchronous
DCDC Converter
4MHz, 1A Synchronous
DCDC Converter
4MHz, 1A Synchronous
DCDC Converter
4MHz, 1A Synchronous
DCDC Converter
2MHz, 1A Synchronous
DCDC Converter
Delivery
Form
T & R
Package
6-pin WL-CSP
T & R
T & R
T & R
T & R
T & R
T & R
6-pin WL-CSP
6-pin WL-CSP
6-pin WL-CSP
6-pin WL-CSP
6-pin WL-CSP
6-pin WL-CSP
Ordering Information: Specifies the available variants of the AS1382
Note(s):
1. Available upon 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
Tobelbader Strasse 30
8141 Premstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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AS1382 − 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.
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Copyrights & Disclaimer
AS1382 − Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten,
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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AS1382 − 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
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AS1382 − Revision Information
Revision Information
Changes from 1-04 (2015-Jun-19) to current revision 1-05 (2016-Oct-25)
Updated Figure 6 and added note below
Updated Equation 1
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
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AS1382 − Content Guide
Content Guide
1 General Description
1 Key Benefits & Features
1 Applications
2 Block Diagram
3 Pin Assignments
4 Absolute Maximum Ratings
5 Electrical Characteristics
6 Typical Operating Characteristics
8 Detailed Description
8 Mode Settings
8 Low-Ripple, Low-Noise Operation
9 High-Efficiency Operation
10 Application Information
10 External Components
10 Inductors
11 Ceramic Input and Output Capacitors
11 Feedback Resistor Selection
12 PCB Layout
13 Package Drawings & Markings
15 Ordering & Contact Information
16 RoHS Compliant & ams Green Statement
17 Copyrights & Disclaimer
18 Document Status
19 Revision Information
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