iD9305 - iDESYN
iD9305
300mA Ultra-Fast Output Voltage LDO Regulator
General Description
Features
The iD9305 is a 300mA with fixed output voltage
„
Ultra-Low-Noise application
options ranging from 1.05V to 1.4V, low dropout and
„
Wide 2.5V to 6V Operating Range
low noise linear regulator with high ripple rejection
„
Quick Start-Up
ratio and fast turn-on time.
„
Four Fixed Voltage Options Available
It includes a reference voltage source, an error
„
Current Limiting Protection
amplifier, driver transistors and an internal current
„
Thermal Shutdown Protection
limiter. The current limiter’s holdback circuit operates
„
Standby Current Less Than 0.1μA
as a short circuit protection.
„
Auto Discharge
The iD9305 works well with low ESR ceramic
capacitors,
suitable
wireless
Applications
battery-powered
applications with stringent space requirements and
„
Battery-Powered Equipment
demanding performance. It also offers ultra low noise
„
Portable Instruments
output and has low quiescent current.
„
Digital Camera
„
WLAN Communication
„
Hand-Held Instruments
Marking Information
Ordering Information
iD9305 - □□ □□□ □
For marking information, contact our sales
representative directly or through an iDESYN
Package
Packing
distributor located in your area, otherwise visit our
R: Tape and Reel
website for detail.
A30:SOT23-3
A50:SOT23-5
C40:SC-82
C50:SC70-5
Output Voltage Voltage Code
1.1
11
1.2
12
1.3
13
1.4
14
Apr. 2011
1
Rev 0.5
iD9305
Typical Application Circuit
V IN
C IN =1μF
V IN
V OUT
iD9305
EN
Enable
C OUT=1μF
V OUT
GND
100K
Absolute Maximum Ratings
Supply Voltage VIN
Recommended Operating Conditions
6V
Input Voltage VIN
2.5V to 6V
EN Input Voltage
0V to 6V
Power Dissipation, PD @ TA=25°C
SC70-5 / SC-82
300mW
Junction Temperature
SOT23-5 / SOT23-3
400mW
Ambient Operating Temperature
-40°C to 125°C
-40°C to 85°C
Thermal Resistance, θja
SC70-5 / SC-82
333°C/W
SOT23-5 / SOT23-3
250°C/W
Lead Temperature
Storage Temperature
ESD Susceptibility
HBM (Human Body Mode)
MM (Machine Mode)
Apr. 2011
260°C
-65°C to 150°C
2kV
200V
2
Rev 0.5
iD9305
Electrical Characteristics (Unless otherwise specified VIN = 2.5V, TA = 25°C)
Parameters
Symbol
Output Voltage Accuracy
Standby Current
Supply Current Limit
Quiescent Current
EN Input Bias Current
Dropout Voltage (Note 2)
Operating Voltage Range
ΔVOUT
ISBY
ILimit
IQ
IIBSD
VDROP
VIN
Line Regulation
ΔVLINE
Load Regulation
ΔVLOAD
Output Noise Voltage
Fast Discharge N-MOSFET Turn On
Resistance
Thermal Shutdown
Temperature
Thermal Shutdown
Temperature Hysteresis
Logic-Low V
EN Threshold
Logic-High V
Power Supply
Rejection Rate
f = 100Hz
eNO
RDISCHARGE
Condition
IOUT =1mA
VEN = GND, Shutdown
RLOAD = 1Ω
VEN ≧1.2V, IOUT = 0mA
VEN = GND or VIN
VOUT = 1.2V, IOUT = 150mA
Min
Typ
-30
400
2.5
0.01
800
80
0
700
--
VIN = 2.5V to 6V
IOUT = 1mA
1mA < IOUT < 300mA
10Hz to 100KHz,
IOUT = 200mA, COUT = 1μF
10
VIN = 4V, VEN = 0V
35
Max
Units
+30
1
120
100
900
6
mV
μA
mA
μA
nA
mV
V
6
mV/V
35
mV
100
μVRMS
Ω
TSD
165
o
ΔTSD
30
o
VIL
VIH
VIN = 2.5V to 6V, Shutdown
VIN = 2.5V to 6V, Start-Up
PSRR
COUT = 1μF, IOUT = 10mA
C
C
0.4
1.6
-55
V
dB
Note 1: Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated
in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may remain possibility to affect device reliability.
Note 2: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT.
.
Apr. 2011
3
Rev 0.5
iD9305
Pin Configurations
(Top View)
VIN
VOUT
4
3
1
2
EN
GND
SC-82
Description
Pin Name
Pin Function
EN
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ
resistor connected to GND when the control signal is floating.
GND
Ground
VOUT
Output Voltage
VIN
Input Voltage
Function Block Diagram
Apr. 2011
4
Rev 0.5
iD9305
Typical Operating Characteristics
Quiescent Current vs. Input Voltage
Load Regulation
100
Quiescent Current (μA)
1.23
Output Voltage (V)
1.22
1.21
1.20
1.19
90
80
70
60
50
1.18
0
50
100
150
200
250
3
300
3.5
Line Regulation
5.5
6
0.06
Shutdown Current (μA)
1.22
Output Voltage (V)
5
Shutdown Current vs. Input Voltage
1.23
1.21
1.2
1.19
0.05
0.04
0.03
0.02
0.01
0
1.18
2.5
3
3.5
4
4.5
5
5.5
3
6
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Input Voltage (V)
Current Limit vs. Input Voltage
Dropout Voltage vs. Load Current
1000
1100
900
Dropout Voltage (mV)
1000
Current Limit (mA)
4.5
Input Voltage (V)
Load Current (mA)
900
800
700
600
500
800
700
600
500
400
300
200
2.5
3
3.5
4
4.5
0
5
Input Voltage (V)
Apr. 2011
4
50
100
150
200
250
300
Load Current (mA)
5
Rev 0.5
iD9305
Enable Threshold vs. Temperature
Enable Threshold vs. Input Voltage
1
EN-on
EN-off
1.1
EN Pin Voltage (V)
EN Pin Voltage (V)
VOUT Off to On
1
0.9
0.8
VOUT On to Off
0.7
0.6
0.5
-50
-25
0
25
50
75
100
125
0.9
0.8
0.7
0.6
0.5
150
2.5
Temperature (℃)
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
PSRR
70
65
60
PSRR (dB)
55
50
45
40
35
30
VIN =3.3V+0.5VP-PAC
VOUT=1.2V, IOUT=10mA
CIN=COUT=1uF
25
20
10
100
1000
10000
100000
Frequency (Hz)
Apr. 2011
6
Rev 0.5
iD9305
Line Transient Response
Load Transient Response
VOUT-AC
VOUT-AC
(20mV/Div)
(20mV/Div)
VIN -DC
ILOAD-DC
(1V/Div)
Offset 2.5V
VIN = 2.5V ~ 3.5V, ILOAD = 10mA
(200mA/Div)
VIN = 2.5V, ILOAD = 1mA ~ 300mA
Time (400μs/Div)
Time (1ms/Div)
Line Transient Response
Start Up Response
VOUT-AC
(20mV/Div)
VOUT-DC
(500mV/Div)
VIN -DC
(1V/Div)
Offset 2.5V
VEN -DC
VIN = 2.5V ~ 3.5V, ILOAD = 100mA
(1V/Div)
VIN = 2.5V,VOUT= 1.2V, ILOAD = 0mA
Time (40μs/Div)
Time (1ms/Div)
Load Transient Response
Shutdown Response
VOUT-AC
(20mV/Div)
VOUT-DC
(500mV/Div)
ILOAD-DC
VEN -DC
(100mA/Div)
VIN = 2.5V, ILOAD = 1mA ~ 150mA
(1V/Div)
Time (400μs/Div)
Apr. 2011
VIN = 2.5V, VOUT=1.2V, ILOAD = 0mA
Time (100μs/Div)
7
Rev 0.5
iD9305
Application Information
is at least 1μF with ESR is > 25mΩ on the iD9305
Capacitor Selection and Regulator
Stability
output ensures stability. The iD9305 still works well
with output capacitors of other types due to the wide
Input Capacitor
stable ESR range. Figure 1 shows the curves of
An input capacitance of 1μF is required between the
allowable ESR range as a function of load current for
device input pin and ground directly (the amount of the
various output capacitor values. Output capacitors of
capacitance may be increased without limit). The input
larger capacitance can reduce noise and improve load
capacitor MUST be located less than 1 cm from the
transient response, stability and PSRR. The output
device to assure input stability (see PCB Layout
capacitor should be located not more than 0.5 inches
Section). A lower ESR capacitor allows the use of less
from the VOUT pin of the iD9305 and returned to a clean
capacitance, while higher ESR type (like aluminum
analog ground.
electrolytic) requires more capacitance. Capacitor
types (aluminum, ceramic and tantalum) can be mixed
in parallel, but the total equivalent input capacitance
/ESR must be defined as above for stable operation.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient
must be considered when selecting the capacitor to
ensure the capacitance is 1 μF over the entire
operating range.
Output Capacitor
Like any low-dropout regulator, the external capacitors
used with the iD9305 must be carefully selected for
Enable Function
regulator stability and performance. Use a capacitor
The iD9305 is shut down by pulling the EN pin low, and
whose value is > 1μF on the iD9305 input, however the
turned on by driving the input high. If the shutdown
amount of capacitance can be increased without limit.
feature is not required, the EN pin should be tied to
The input capacitor must be located a distance of not
VIN to keep the regulator on at all times (the EN pin
more than 0.5 inch of from the input pin of the IC and
MUST NOT be left floating).
returned to a clean analog ground. Any good quality
To assure proper operation, the signal source used to
ceramic or tantalum can be used for this capacitor.
drive the EN pin must be able to swing above and
Capacitor with larger value and lower ESR (equivalent
below the specified turn-on/off voltage thresholds listed
series resistance) provides better PSRR and line-
in the “Electrical Characteristics” under VIH and VIL. The
transient response. The output capacitor must meet
ON/OFF signal may come from either CMOS output, or
both requirements for minimum amount of capacitance
an open-collector output with pull-up resistor to the
and ESR in all LDOs application. The iD9305 is
device input voltage or another logic supply. The high-
designed specifically to work with low ESR ceramic
level voltage may exceed the device input voltage, but
output capacitors in space-saving and performance
must remain within the absolute maximum ratings for
consideration. Using a ceramic capacitor whose value
the EN pin.
Apr. 2011
8
Rev 0.5
iD9305
Operating Region and Power Dissipation
Since the iD9305 is a linear regulator, its power
dissipation is always given by P = IOUT (VIN – VOUT). The
maximum power dissipation is given by: PD(MAX) = (TJ–
TA) /θJA=(125°C -25°C)/250°C /W = 400mW where (TJ–
Safe Operation Area of IOUT=300mA
TA) is the temperature difference the iD9305 die and
[Power Dissipation Limit]
400
the ambient air, θJA is the thermal resistance of the
device, heat sinking is accomplished by using the heat
300
Output Current IOUT (mA)
chosen package to the ambient air. For surface mount
350
spreading capabilities of the PC board and its copper
traces. In the case of a SOT23-5 package, the thermal
resistance is typically 250°C/Watt. Refer to Figure 2 & 3
for the iD9305 valid operating region (Safe Operating
Area) and refer to Figure 4 for maximum power
dissipation information of SOT23-5.
Still air SOT23-5 package
Mounted on recommended footprint (θJA =250°C/W)
250
TA=25°C
200
TA=55°C
150
100
50
TA=85°C
0
The die attachment area of the iD9305 lead frame is
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
connected to pin 2, which is the GND pin. Therefore,
Input-Output Voltage Differential VIN-VOUT(V)
Fig 3
the GND pin of iD9305 can dissipate the heat from the
die very effectively. To improve the maximum power
providing capability, connect the GND pin to ground
using a large ground plane near the GND pin.
Safe Operation Area of IOUT=150mA
Maximum Power Dissipation
[Power Dissipation Limit]
0.5
Still air SOT23-5 package
Mounted on recommended footprint (θJA=250°C/W)
200
TA=85°C
150
TA=55°C
Still air SOT23-3/SOT23-5/SC70-5/SC-82 package
Mounted on recommended footprint
0.45
Power Dissipation PD(W)
Output Current IOUT (mA)
250
TA=25°C
100
50
0.4
0.35
0.3
0.25
SOT23-3 / SOT23-5
0.2
0.15
SC70-5 / SC-82
0.1
0.05
0
0
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
25
45
55
65
75
85
95
105
115
Ambient Temperature TA(°C)
Input-Output Voltage Differential VIN-VOUT(V)
Fig 2
Apr. 2011
35
Fig 4
9
Rev 0.5
125
iD9305
Packaging
SC70-5
SYMBOLS
A
A1
A2
b
C
D
E
E1
e
e1
L
Apr. 2011
DIMENSIONS IN
MILLIMETERS
MIN
NOM
MAX
0.90
--1.10
0.025
--0.10
0.875
--1.00
0.20
--0.40
0.10
--0.15
1.90
--2.10
1.15
--1.35
2.00
--2.20
0.65 BSC.
1.30 BSC.
0.425 REF.
10
DIMENSIONS IN INCH
MIN
0.036
0.001
0.035
0.008
0.004
0.076
0.046
0.080
NOM
----------------0.026 BSC.
0.052 BSC.
0.017 REF.
MAX
0.044
0.004
0.040
0.016
0.006
0.084
0.054
0.088
Rev 0.5
iD9305
SOT23-3
SYMBOLS
A
A1
A2
b
C
D
E
e
H
L
Θ1
Apr. 2011
DIMENSIONS IN MILLIMETERS
MIN
1.00
0.00
0.70
0.35
0.10
2.70
1.40
--2.60
0.370
1°
NOM
1.10
--0.80
0.40
0.15
2.90
1.60
1.90(TYP)
2.80
--5°
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
--3.00
--9°
11
DIMENSIONS IN INCH
MIN
0.039
0.000
0.027
0.013
0.004
0.106
0.055
--0.102
0.015
1°
NOM
0.043
--0.031
0.016
0.006
0.114
0.063
0.075
0.110
--5°
MAX
0.051
0.004
0.035
0.020
0.001
0.122
0.071
--0.118
--9°
Rev 0.5
iD9305
SOT23-5
SYMBOLS
A
A1
A2
b
C
D
E
e
H
L
Θ1
e1
Apr. 2011
DIMENSIONS IN MILLIMETERS
MIN
1.00
0.00
0.70
0.35
0.10
2.70
1.50
--2.60
0.370
1°
---
NOM
1.10
--0.80
0.40
0.15
2.90
1.60
1.90(TYP)
2.80
--5°
0.95(TYP)
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
--3.00
--9°
---
12
DIMENSIONS IN INCH
MIN
0.039
0.000
0.027
0.013
0.004
0.106
0.059
--0.102
0.015
1°
---
NOM
0.043
--0.031
0.016
0.006
0.114
0.063
0.075
0.110
--5°
0.037
MAX
0.051
0.004
0.035
0.020
0.001
0.122
0.071
--0.118
--9°
---
Rev 0.5
iD9305
SC-82
SYMBOLS
A
A1
A2
b
b1
C
D
E
E1
e
e1
e2
L
Apr. 2011
DIMENSIONS IN MILLIMETERS
MIN
0.85
0.00
0.85
0.20
0.5
0.10
1.90
1.15
2.00
NOM
----------------0.65 BSC.
1.30 BSC.
0.15 BSC.
0.425 REF.
MAX
1.05
0.10
0.95
0.40
0.7
0.15
2.10
1.35
2.30
13
DIMENSIONS IN INCH
MIN
0.033
0.000
0.033
0.008
0.020
0.004
0.075
0.045
0.080
NOM
----------------0.026 BSC.
0.052 BSC.
0.006 BSC.
0.017 REF.
MAX
0.041
0.004
0.037
0.016
0.028
0.006
0.083
0.053
0.091
Rev 0.5
iD9305
Footprints
SOT23-3
SOT23-5
Apr. 2011
14
Rev 0.5
iD9305
SC70-5
SC-82
Apr. 2011
15
Rev 0.5
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