AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Description
The AP7331 is a 300mA, adjustable and fixed output
voltage, low dropout linear regulator. The device included
pass element, error amplifier, band-gap, current limit and
thermal shutdown circuitry. The device is turned on when EN
pin is set to logic high level.
The characteristics of low dropout voltage and low quiescent
current make it suitable for low power applications, for
example, battery powered devices. The typical quiescent
current is approximately 65μA.
Built-in current-limit and thermal-shutdown functions prevent
IC from damage in fault conditions.
The AP7331 is available in SOT25 and DFN2020-6
packages.
Pin Assignments
SOT25 (Fixed Output)
(Top View)
IN 1
GND 2
EN 3
4 NC
5 OUT
SOT25 (ADJ Output)
(Top View)
DFN2020-6 (Fixed Output)
(Top View)
EN 1
GND 2
IN 3
6 NC
5 NC
4 OUT
DFN2020-6 (ADJ Output)
(Top View)
EN 1
GND 2
IN 3
6 ADJ
5 NC
4 OUT
Features
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Applications
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300mA Low Dropout Regulator with EN
Very low I
Q
over full load: 65µA
Wide input voltage range: 2V to 6V
Wide adjustable output: 0.8V to 5.0V
Fixed output options: 1.0V to 3.3V
PSRR: 65dB typical at 100Hz
Fast start-up time: 80µs
Stable with low ESR, 1µF ceramic output capacitor
Excellent Load/Line Transient Response
Low dropout: 300mV typical at 300mA
Current limit protection
Short circuit protection
Thermal shutdown protection
Ambient temperature range: -40ºC to 85°C
SOT25 and DFN2020-6: Available in “Green” Molding
Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
XDSL Routers
Wireless LAN Cards
Desktop and Notebook Computers
Battery Powered Equipments
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html
AP7331
Document number: DS31914 Rev. 3 - 2
1 of 13
www.diodes.com
January 2011
© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Application Circuit
V
IN
IN
AP7331
1uF
Enable
1uF
EN
GND
1uF
Enable
EN
GND
ADJ
R2
V
OUT
OUT
V
IN
IN
AP7331
OUT
V
OUT
R1
1uF
Fixed Output
Adjustable Output
⎛
R
⎞
VOUT
=
VREF
⎜
1
+
1
⎟
⎜
R2
⎟
⎝
⎠
Pin Descriptions
Pin Name
IN
GND
EN
ADJ
NC
OUT
SOT25
(fixed)
1
2
3
-
4
5
Pin Number
DFN2020-6
SOT25
(fixed)
(adj)
3
2
1
-
5, 6
4
1
2
3
4
-
5
DFN2020-6
(adj)
3
2
1
6
5
4
Description
Voltage input pin. Bypass to ground through at least
1µF capacitor
Ground
Enable input, active high
Output feedback pin
No connection
Voltage output pin. Bypass to ground through 1µF
ceramic capacitor
Functional Block Diagram
IN
Current Limit
and Thermal
Shutdown
OUT
IN
Current Limit
and Thermal
Shutdown
OUT
EN
Gate
Driver
R
EN
Gate
Driver
ADJ
0.4V
R
0.4V
GND
GND
Fixed Version
Adjustable Version
AP7331
Document number: DS31914 Rev. 3 - 2
2 of 13
www.diodes.com
January 2011
© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Absolute Maximum Ratings
Symbol
ESD HBM
Parameter
Human Body Model ESD Protection
Ratings
6
Units
kV
ESD MM
V
IN
T
OP
T
ST
P
D
T
J
Machine Model ESD Protection
Input Voltage
EN Voltage
Continuous Load Current
Operating Junction Temperature Range
Storage Temperature Range
Power Dissipation (Note 2)
Maximum Junction Temperature
SOT25
DFN2020-6
400
7
V
IN
+ 0.3
Internal Limited
-40 ~ 125
-65 ~150
640
740
150
V
V
V
°C
°C
mW
mW
°C
Recommended Operating Conditions
Symbol
V
IN
I
OUT
T
A
Notes:
Parameter
Input voltage
Output Current (Note 3)
Operating Ambient Temperature
Min
2
0
-40
Max
6
300
85
Unit
V
mA
°
C
2. Ratings apply to ambient temperature at 25°C
3. The device maintains a stable, regulated output voltage without a load current.
AP7331
Document number: DS31914 Rev. 3 - 2
3 of 13
www.diodes.com
January 2011
© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Electrical Characteristics
(T
A
= 25
o
C, V
IN
= V
OUT
+1V, C
IN
= 1uF, C
OUT
= 1uF, V
EN
= 2V, unless otherwise stated)
Symbol
Parameter
Test Conditions
V
EN
= V
IN
, I
OUT
= 0mA
I
Q
Input Quiescent Current
V
EN
= V
IN
, I
OUT
= 300mA
I
SHDN
Input Shutdown Current
V
EN
= 0V, I
OUT
= 0mA
I
LEAK
Input Leakage Current
V
EN
= 0V, OUT grounded
V
Dropout
Dropout Voltage (Note 4)
I
OUT
= 300mA
V
REF
ADJ Reference Voltage (Adjustable version) I
OUT
= 0mA
I
ADJ
ADJ Leakage (Adjustable version)
T
A
= -40
o
C to 85
o
C,
V
OUT
Output Voltage Accuracy
I
OUT
= 30mA
V
IN
= (V
OUT
+1V) to V
IN-Max
,
Δ
V
OUT
Line Regulation
V
EN
= V
IN
, I
OUT
= 1mA
/
Δ
V
IN
/V
V
IN
= (V
OUT
+1V) to V
IN-Max
,
Δ
V
OUT
Load Regulation
I
OUT
from 1mA to 300mA
/V
OUT
V
EN
= 0V to 2.0V, V
OUT
= 1V,
t
ST
Start-up Time
I
OUT
= 300mA
V
IN
= [V
OUT
+1V]V
DC
+ 0.5V
ppAC
,
PSRR PSRR
f = 100Hz, I
OUT
=30mA
V
IN
= V
IN-Min
to V
IN-Max
,
I
SHORT
Short-circuit Current
V
OUT
< 0.2V
I
LIMIT
Current Limit
V
OUT
/R
OUT
= 1A
V
IL
EN Input Logic Low Voltage
V
IN
= V
IN-Min
to V
IN-Max
V
IH
EN Input Logic High Voltage
V
IN
= V
IN-Min
to V
IN-Max
I
EN
EN Input Current
V
IN
= 0V or V
IN-Max
T
SHDN
Thermal Shutdown Threshold
T
HYS
Thermal Shutdown Hysteresis
SOT25 (Note 5)
θ
JA
Thermal Resistance Junction-to-Ambient
DFN2020-6 (Note 6)
Notes:
Min
⎯
⎯
⎯
Typ.
55
65
300
0.4
⎯
Max
75
85
1
1
550
Unit
μA
μA
μA
mV
V
μA
%
%/V
%
μs
dB
mA
1
2
0.01
0.20
0.6
80
65
100
-2
-0.6
400
1.4
-1
600
0.4
1
140
15
190
167
mA
V
V
μA
°
C
°
C
o
C/W
o
C/W
4. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value.
This parameter only applies to output voltages above 1.8V.
5. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided
6. Test conditions for DFN2020-6: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, double sided,
bottom layer is a copper plane.
AP7331
Document number: DS31914 Rev. 3 - 2
4 of 13
www.diodes.com
January 2011
© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Characteristics
Quiescent Current vs Input Voltage
Iload=300mA
62
61
56
Quiescent Current vs Input Voltage
Iload=0mA
V
OUT
= 3.3V
90°C
V
OUT
= 3.3V
90°C
Quiescent Current (uA)
54
52
50
48
46
44
42
Quiescent Current (uA)
60
59
58
57
56
55
54
4.3
4.5
4.7
4.9
5.1
-45°C
25°C
C
25°C
-45°C
5.3
5.5
5.7
5.9
6.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
Input Voltage (V)
Input Voltage (V)
Reference Voltage vs Input Voltage
0.41
0.1
Line Regulation (% /V)
Output Voltage Variation (%/V)
-45°C
Reference Voltage (V)
0.405
0.4
0.395
0.39
0.08
V
OUT
= 3.3V
V
IN
= V
OUT
+1V
90°C
0.06
0.04
90°C
25°C
0.385
0.38
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
0.02
-45°C
25°C
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
0
Input Voltage (V)
Input Voltage (V)
Load Regulation (% )
0.6
400
Dropout Voltage
V
OUT
= 3.3V
90°C
Output Voltage Variation (%)
0.4
0.2
0
-0.2
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
Dropout Voltage (mV)
350
300
250
200
150
100
25°C
C
-45°C
-0.4
-0.6
0
50
100
25°C
90°C
-45°C
50
150
200
250
300
0
0
50
100
150
200
250
300
Output Current (mA)
Output Current (mA)
AP7331
Document number: DS31914 Rev. 3 - 2
5 of 13
www.diodes.com
January 2011
© Diodes Incorporated
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