AP7331

AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Description
Pin Assignments
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.
SOT25 (Fixed Output)
SOT25 (ADJ Output)
(Top View)
(Top View)
IN 1
5 OUT
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.
GND 2
Built-in current-limit and thermal-shutdown functions prevent
IC from damage in fault conditions.
DFN2020-6 (Fixed Output)
DFN2020-6 (ADJ Output)
(Top View)
(Top View)
EN 3
The AP7331 is available in SOT25 and DFN2020-6
packages.
4 NC
EN 1
6 NC
EN 1
GND 2
5 NC
GND 2
IN 3
Features
Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
300mA Low Dropout Regulator with EN
Very low IQ 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)
Notes:
•
•
•
4 OUT
IN 3
6 ADJ
5 NC
4 OUT
XDSL Routers
Wireless LAN Cards
Desktop and Notebook Computers
Battery Powered Equipments
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
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Application Circuit
VIN
VOUT
IN
VIN
VOUT
OUT
IN
AP7331
1uF
Enable
OUT
AP7331
R1
1uF
1uF
1uF
Enable
EN
ADJ
EN
GND
GND
R2
Adjustable Output
Fixed Output
⎛
R ⎞
VOUT = VREF ⎜⎜ 1 + 1 ⎟⎟
R2 ⎠
⎝
Pin Descriptions
Pin Number
DFN2020-6
SOT25
(fixed)
(adj)
Pin Name
SOT25
(fixed)
IN
1
3
1
3
GND
EN
ADJ
NC
2
3
4
2
1
5, 6
2
3
4
-
2
1
6
5
OUT
5
4
5
4
Description
DFN2020-6
(adj)
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
OUT
IN
EN
Gate
Driver
Current Limit
and Thermal
Shutdown
IN
EN
R
OUT
Gate
Driver
Current Limit
and Thermal
Shutdown
ADJ
0.4V
0.4V
R
GND
GND
Fixed Version
AP7331
Document number: DS31914 Rev. 3 - 2
Adjustable Version
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Absolute Maximum Ratings
Symbol
ESD HBM
Parameter
Human Body Model ESD Protection
ESD MM
VIN
TOP
TST
Machine Model ESD Protection
Input Voltage
EN Voltage
Continuous Load Current
Operating Junction Temperature Range
Storage Temperature Range
PD
Power Dissipation (Note 2)
TJ
Maximum Junction Temperature
SOT25
DFN2020-6
Ratings
6
Units
kV
400
7
VIN + 0.3
Internal Limited
-40 ~ 125
-65 ~150
640
740
V
V
V
°C
°C
mW
mW
150
°C
Recommended Operating Conditions
Symbol
VIN
IOUT
TA
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
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Electrical Characteristics
(TA = 25oC, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless otherwise stated)
Symbol
Parameter
Test Conditions
VEN = VIN, IOUT = 0mA
IQ
Input Quiescent Current
VEN = VIN, IOUT = 300mA
ISHDN
Input Shutdown Current
VEN = 0V, IOUT = 0mA
ILEAK
Input Leakage Current
VEN = 0V, OUT grounded
VDropout Dropout Voltage (Note 4)
IOUT = 300mA
VREF
ADJ Reference Voltage (Adjustable version) IOUT= 0mA
IADJ
ADJ Leakage (Adjustable version)
TA = -40oC to 85oC,
VOUT
Output Voltage Accuracy
IOUT = 30mA
VIN = (VOUT +1V) to VIN-Max,
ΔVOUT
Line Regulation
VEN = VIN, IOUT = 1mA
/ΔVIN/V
VIN = (VOUT +1V) to VIN-Max,
ΔVOUT
Load Regulation
IOUT from 1mA to 300mA
/VOUT
VEN = 0V to 2.0V, VOUT = 1V,
tST
Start-up Time
IOUT = 300mA
VIN = [VOUT +1V]VDC + 0.5VppAC,
PSRR PSRR
f = 100Hz, IOUT =30mA
VIN = VIN-Min to VIN-Max,
ISHORT Short-circuit Current
VOUT < 0.2V
ILIMIT
Current Limit
VOUT/ROUT = 1A
VIL
EN Input Logic Low Voltage
VIN = VIN-Min to VIN-Max
VIH
EN Input Logic High Voltage
VIN = VIN-Min to VIN-Max
IEN
EN Input Current
VIN = 0V or VIN-Max
TSHDN
Thermal Shutdown Threshold
THYS
Thermal Shutdown Hysteresis
SOT25 (Note 5)
θJA
Thermal Resistance Junction-to-Ambient
DFN2020-6 (Note 6)
Notes:
Min
⎯
Typ.
55
65
⎯
⎯
Max
75
85
1
1
550
Unit
μA
⎯
1
μA
μA
mV
V
μA
-2
2
%
0.20
%/V
0.6
%
300
0.4
0.01
-0.6
400
80
μs
65
dB
100
mA
600
0.4
1.4
-1
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
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© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Characteristics
Quiescent Current vs Input Voltage
Iload=0mA
Quiescent Current vs Input Voltage
Iload=300mA
62
56
Quiescent Current (uA)
Quiescent Current (uA)
VOUT = 3.3V
61
90°C
60
59
58
57
-45°C
25°C
C
56
55
VOUT = 3.3V
54
52
50
48
46
25°C
44
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
4.3
6.1
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
5.9
6.1
Input Voltage (V)
Input Voltage (V)
Reference Voltage vs Input Voltage
Line Regulation (% /V)
0.41
0.1
Output Voltage Variation (%/V)
-45°C
0.405
0.4
0.395
0.39
90°C
25°C
0.385
VOUT = 3.3V
VIN = VOUT +1V
0.08
90°C
0.06
0.04
-45°C
0.02
0.38
25°C
0
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
4.3
4.5
4.7
4.9
Input Voltage (V)
5.1
5.3
5.5
5.7
Input Voltage (V)
Dropout Voltage
Load Regulation (% )
0.6
400
VOUT = 3.3V
VIN = VOUT + 1V
0.4
0.2
0
-0.2
-45°C
VOUT = 3.3V
350
Dropout Voltage (mV)
Output Voltage Variation (%)
-45°C
42
54
Reference Voltage (V)
90°C
25°C
90°C
-0.4
90°C
300
250
25°C
C
200
150
100
-45°C
50
-0.6
0
50
100
150
200
250
300
Output Current (mA)
AP7331
Document number: DS31914 Rev. 3 - 2
0
0
50
100
150
200
250
300
Output Current (mA)
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Characteristics (Continued)
Current Limit vs Input Voltage
Short Circuit vs Input Voltage
115
600
Current Limit (mA)
110
Output Current (mA)
-45°C
VOUT=3.3V
105
100
95
90
85
25°C
C
80
3.5
TA = 25°C
VOUT = 1.8V
550
500
450
90°C
400
4
4.5
5
5.5
2.8
6
3.2
3.6
4
PSRR
4.8
5.2
5.6
6
PSRR
70
70
VOUT = 1.8V
VIN = 2.8V
CIN = COUT = 1uF
TA = 25°C
60
VOUT = 3.3V
VIN = 4.3V
CIN = COUT = 1uF
TA = 25°C
65
60
PSRR (dB)
65
PSRR (dB)
4.4
Input Voltage (V)
Input Voltage (V)
55
50
45
40
55
50
45
40
35
35
0.1
1
10
100
Frequency (kHz)
AP7331
Document number: DS31914 Rev. 3 - 2
0.1
1
10
100
Frequency (kHz)
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Characteristics (Continued)
Start-Up Time (No Load)
Start-Up Time (300mA Load)
VEN = 0 to 2V (1V/div)
VIN = 4.3V
CIN = COUT =1uF
VEN = 0 to 2V (1V/div)
VIN = 4.3V
CIN = COUT =1uF
VOUT = 3.3V (1V/div)
VOUT = 3.3V (1V/div)
IOUT = 300mA (300mA/div)
Time (50us/div)
Time (50us/div)
Line Transient Response
Line Transient Response
VIN = 5.3V to 4.3V (1V/div)
Tf =1 0us
VIN =4.3V to 5.3V (1V/div)
Tr = 10us
VOUT = 3.3V (50mV/div)
VOUT = 3.3V (50mV/div)
IOUT = 300mA (300mA/div)
IOUT = 300mA (300mA/div)
Time (50us/div)
Time (50us/div)
Load Transient Response
Load Transient Response
VOUT = 3.3V
(100mV/div)
VOUT = 0.8V
(100mV/div)
IOUT = 1mA to 300mA
(100mA/div)
IOUT = 1mA to 300mA
(100mA/div)
Tr = Tf = 10us
VIN =4.3V
Time (100us/div)
Time (100us/div)
AP7331
Document number: DS31914 Rev. 3 - 2
Tr = Tf = 10us
VIN = 2V
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Application Note
Input Capacitor
ON/OFF Input Operation
A 1μF ceramic capacitor is recommended to connect
between VIN and GND pins to decouple input power supply
glitch and noise. The amount of the capacitance may be
increased without limit. This input capacitor must be
located as close as possible to the device to assure input
stability and less noise. For PCB layout, a wide copper
trace is required for both VIN and GND. A lower ESR
capacitor allows the use of less capacitance, while higher
ESR type requires more capacitance.
The AP7331 is turned on by setting the EN pin high, and
is turned off by pulling it low. If this feature is not used,
the EN pin should be tied to IN pin to keep the regulator
output on at all time. To ensure proper operation, the
signal source used to drive the EN pin must be able to
swing above and below the specified turn-on/off voltage
thresholds listed in the Electrical
Output Capacitor
Current Limit Protection
The output capacitor is required to stabilize and help
transient response for LDO. The AP7331 is stable with
very small ceramic output capacitors. The recommended
capacitance is from 1μF to 4.7μF, Equivalent Series
Resistance (ESR) is from 10mΩ to 200mΩ, and
temperature characteristic is X7R or X5R. Higher
capacitance values help to improve load/line transient
response. The output capacitance may be increased to
keep low undershoot/overshoot. Place output capacitor as
close as possible to OUT and GND pins, and keep the
leads as short as possible.
When output current at OUT pin is higher than current
limit threshold, the current limit protection will be
triggered and clamp the output current to approximately
600mA to prevent over-current and to protect the
regulator from damage due to overheating.
Characteristics section under VIL and VIH.
Short Circuit Protection
When OUT pin is short-circuit to GND or OUT pin voltage
is less than 200mV, short circuit protection will be
triggered and clamp the output current to approximately
100mA. This feature protects the regulator from overcurrent and damage due to overheating.
Adjustable Operation
The AP7331 provides output voltage from 0.8V to 5.0V
through external resistor divider as shown below.
V IN
V OUT
IN
OUT
A P 73 3 1
1uF
E n a ble
R1
1uF
ADJ
EN
GND
R2
Thermal Shutdown Protection
Thermal protection disables the output when the junction
temperature rises to approximately +140°C, allowing the
device to cool down. When the junction temperature
reduces to approximately +125°C the output circuitry is
enabled again. Depending on power dissipation, thermal
resistance, and ambient temperature, the thermal
protection circuit may cycle on and off. This cycling limits
the heat dissipation of the regulator, protecting it from
damage due to overheating.
Ultra Fast Start-up
After enabled, the AP7331 is able to provide full power in
as little as tens of microseconds, typically 80µs, without
sacrificing low ground current. This feature will help load
circuitry move in and out of standby mode in real time,
eventually extend battery life for mobile phones and other
portable devices.
The output voltage is calculated by:
⎛
R ⎞
VOUT = VREF ⎜⎜1 + 1 ⎟⎟
R
2⎠
⎝
Where VREF=0.4V (the internal reference voltage)
Rearranging the equation will give the following that is
used for adjusting the output to a particular voltage:
⎞
⎛V
R1 = R 2 ⎜⎜ OUT − 1⎟⎟
V
⎠
⎝ REF
To maintain the stability of the internal reference voltage,
R2 need to be kept smaller than 125kΩ.
No Load Stability
Other than external resistor divider, no minimum load is
required to keep the device stable. The device will remain
stable and regulated in no load condition.
AP7331
Document number: DS31914 Rev. 3 - 2
Fast Transient Response
Fast transient response LDOs can extend battery life.
TDMA-based cell phone protocols such as Global
System for Mobile Communications (GSM) have a
transmit/receive duty factor of only 12.5 percent, enabling
power savings by putting much of the baseband circuitry
into standby mode in between transmit cycles. In
baseband circuits, the load often transitions virtually
instantaneously from 100µA to 100mA. To meet this load
requirement, the LDO must react very quickly without a
large voltage drop or overshoot — a requirement that
cannot be met with conventional, general-purpose LDOs.
8 of 13
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Application Note (Continued)
Fast Transient Response (Continued)
Low Quiescent Current
The AP7331’s fast transient response from 0 to 300mA
provides stable voltage supply for fast DSP and GSM
chipset with fast changing load.
The AP7331, consuming only around 65µA for all input
range and output loading, provides great power saving in
portable and low power applications.
Small Overshoot and Undershoot
Wide Output Range
The AP7331 has small and controlled overshoot and
undershoot in load and line transitions. This helps to
protect supplied circuit from damage and operation error
caused by glitches. This feature also permits the usage
of small value output decoupling capacitor with AP7331.
The AP7331, with a wide output range of 0.8V to 5.0V,
provides a versatile LDO solution for many portable
applications.
Ordering Information
AP7331 - XX XX G - 7
Output
Blank : ADJ
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
20 : 2.0V
25 : 2.5V
28 : 2.8V
30 : 3.0V
33 : 3.3V
Package
Green
Packing
W : SOT25
SN : DFN2020-6
G : Green
7 : Tape & Reel
Device
Package Code
Packaging
(Note 7)
AP7331-XXWG-7
AP7331-XXSNG-7
W
SN
SOT25
DFN2020-6
Note:
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3000/Tape & Reel
-7
7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Marking Information
1. SOT25
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
( Top View )
4
7
5
XX Y W X
1
2
3
Device
AP7331-ADJ
AP7331-10
AP7331-12
AP7331-15
AP7331-18
AP7331-20
AP7331-25
AP7331-28
AP7331-30
AP7331-33
XX : Identification code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
Identification Code
QJ
QK
QL
QM
QN
QT
QP
QQ
QR
QS
2. DFN2020-6
( Top View )
XX
Y WX
Device
AP7331-ADJ
AP7331-10
AP7331-12
AP7331-15
AP7331-18
AP7331-20
AP7331-25
AP7331-28
AP7331-30
AP7331-33
XX : Identification Code
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
DFN2020-6
Identification Code
QJ
QK
QL
QM
QN
QT
QP
QQ
QR
QS
Package Outline Dimensions (All Dimensions in mm)
1. Package Type: SOT25
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
0.43mon.
0.57/0.63
2. Package Type: DFN2020-6
Marking
0.05 C
2x
0/0.05
0.15max.
0.15 C
0.08 C
Seating plane
C
1.95/2.075
A
0.30/0.40
1.45/1.65
0.76/0.96
1.95/2.075
B
(Active area depth)
.1
R0
2x-
0.15 C
0.65nom.
0.2/0.3
Bottom View
0.05 M C A B
Pin#1 ID
Tape Orientation (Note 8)
DFN2020-6
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Notes:
8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AP7331
Document number: DS31914 Rev. 3 - 2
12 of 13
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© Diodes Incorporated
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
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notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2011, Diodes Incorporated
www.diodes.com
AP7331
Document number: DS31914 Rev. 3 - 2
13 of 13
www.diodes.com
January 2011
© Diodes Incorporated
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