AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 1 of 13
www.diodes.com January 2011
© Diodes Incorporated
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 devic e is turned on when EN
pin is set to logic high level.
The characteristics of lo w dropout voltage and lo w 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
Features
• 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” Moldi ng
Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
Applications
• 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_fr ee.html
IN
EN
OUT
5
3
2
1
GND
NC
4
GND
OUT
4IN
EN
NC
5
3
2
1NC
6
GND
OUT
4
IN
EN
NC
5
3
2
1ADJ
6
SOT2 5 (Fix ed Output)
(Top View)
SOT25 (ADJ Output)
(Top View)
DFN2020-6 (Fixed O utput)
(Top View)
DFN2020- 6 (ADJ Output)
(Top View)
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 2 of 13
www.diodes.com January 2011
© Diodes Incorporated
Typical Application Circuit
1uF
IN
GND
EN
OUT
Enable 1uF
VIN VOUT
AP7331
Fixed Output
1uF
IN
GND
EN
OUT
Enable ADJ
R2
R1 1uF
VIN VOUT
AP7331
Adjustable Output
Pin Descriptions
Pin Name Pin Numbe
r
Description
SOT25
(fixed) DFN2020-6
(fixed) SOT25
(adj) DFN2020-6
(adj)
IN 1 3 1 3
Voltage input pin. Bypass to ground through at least
1µF capacitor
GND 2 2 2 2 Ground
EN 3 1 3 1 Enable input, active high
ADJ - - 4 6 Output feedback pin
NC 4 5, 6 - 5 No connection
OUT 5 4 5 4
Voltage output pin. Bypass to ground thro ugh 1µF
ceramic capacitor
Functional Block Diagram
IN
EN
GND
OUT
Gate
Driver
0.4V
Current Limit
and Thermal
Shutdown
Fixed Version
R
R
IN
EN
GND
ADJ
OUT
Gate
Driver
0.4V
C u rrent L im i t
and Thermal
Shutdown
A d justa b le Vers ion
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛+= 2
R1
R
1
REF
V
OUT
V
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 3 of 13
www.diodes.com January 2011
© Diodes Incorporated
Absolute Maximum Ratings
Symbol Parameter Ratings Units
ESD HBM Human Body Model ESD Protection 6 kV
ESD MM Machine Model ESD Protection 400 V
VIN Input Voltage 7 V
EN Voltage VIN + 0.3 V
Continuous Load Current Internal Limited
TOP Operating Junction Temperature Range -40 ~ 125 °C
TST Storage Temperature Range -65 ~150 °C
PD Power Dissipation (Note 2) SOT25 640 mW
DFN2020-6 740 mW
TJ Maximum Junction Temperature 150 °C
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VIN Input voltage 2 6 V
IOUT Output Current (Note 3) 0 300 mA
TA Operating Ambient Temperature -40 85 °C
Notes: 2. Ratings apply to ambient temperature at 25°C
3. The device maintains a stable, regulated output voltage without a load current.
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 4 of 13
www.diodes.com January 2011
© Diodes Incorporated
Electrical Characteristics
(TA = 25oC, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless oth erwise stated)
Symbol Parameter Test Conditions Min Typ. Max Unit
IQ Input Quiescent Current VEN = VIN, IOUT = 0mA
⎯
55 75 μA
VEN = VIN, IOUT = 300mA 65 85
ISHDN Input Shutdown Current VEN = 0V, IOUT = 0mA
⎯
1 μA
ILEAK Input Leakage Current VEN = 0V, OUT grounded
⎯
1 μA
VDropou
t
Dropout Voltage (Note 4) IOUT = 300mA 300 550 mV
VREF ADJ Reference Voltage (Adjustable version) IOUT= 0mA 0.4 V
IADJ ADJ Leakage (Adjustable version)
⎯
1 μA
VOUT Output Voltage Accuracy TA = -40oC to 85oC,
IOUT = 30mA -2 2 %
ΔVOUT
/ΔVIN/V Line Regulation VIN = (VOUT +1V) to VIN-Max,
VEN = VIN, IOUT = 1mA 0.01 0.20 %/V
ΔVOUT
/VOUT Load Regulatio n VIN = (VOUT +1V) to VIN-Max,
IOUT from 1mA to 300mA -0.6 0.6 %
tST Start-up Time VEN = 0V to 2.0V, VOUT = 1V,
IOUT = 300mA 80 μs
PSRR PSRR VIN = [VOUT +1V]VDC + 0.5VppAC,
f = 100Hz, IOUT =30mA 65 dB
ISHORT Short-circuit Current VIN = VIN-Min to VIN-Max,
VOUT < 0.2V 100 mA
ILIMIT Current Limit VOUT/ROUT = 1A 400 600 mA
VIL EN Input Logic Low Voltage VIN = VIN-Min to VIN-Ma
x
0.4 V
VIH EN Input Logic High Voltage VIN = VIN-Min to VIN-Max 1.4 V
IEN EN Input Curre nt VIN = 0V or VIN
-
Ma
x
-1 1 μA
TSHDN Thermal Shutdown Threshold 140 °C
THYS Thermal Shutdown Hysteresis 15 °C
θJA Thermal Resistance Junction-to-Ambient SOT25 (Note 5) 190 oC/W
DFN2020-6 (Note 6) 167 oC/W
Notes: 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
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 5 of 13
www.diodes.com January 2011
© Diodes Incorporated
Typical Characteristics
Q ui esce nt Curr ent vs I nput Vol tage
Iload=300mA
54
55
56
57
58
59
60
61
62
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
Input V ol t age (V )
Qui escent Curre nt (u A )
Q ui escent Current vs I nput Volt age
Iload=0mA
42
44
46
48
50
52
54
56
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
Input Voltage (V)
Quiescent Current (uA)
Re fe re nce Volta ge vs Input Volta ge
0.38
0.385
0.39
0.395
0.4
0.405
0.41
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
Input Vol tage (V )
Ref erenc e Vol tage (V)
Li ne Regul at ion (%/V)
0
0.02
0.04
0.06
0.08
0.1
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
Input V ol t age (V )
Output V ol tage Variation (%/V )
Load Regula t i on ( %)
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0 50 100 150 200 250 300
Output Current (mA)
Out p ut Voltage V ari ation (%)
Dropout Volta ge
0
50
100
150
200
250
300
350
400
0 50 100 150 200 250 300
Outp ut Current (m A)
Dropout V ol t age (mV)
90°C
-45°C 25°C
90°C
90°C
25°C 25°C -45°C
90°C
25°C
C
-45°C
25°C -45°C 90°C
90°C
-45°C
25°C
C
-45°C
VOUT = 3.3V VOUT = 3.3V
VOUT = 3.3V
VIN = VOUT +1V
VOUT = 3.3V
VIN = VOUT + 1V VOUT = 3.3V
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 6 of 13
www.diodes.com January 2011
© Diodes Incorporated
Typical Characteristics (Continued)
Short Circuit vs Input Voltage
80
85
90
95
100
105
110
115
3.5 4 4.5 5 5.5 6
Input Vol ta ge (V)
Output Current (mA)
Curr ent Limit vs I nput Vol t age
400
450
500
550
600
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
Input Voltage (V)
Cu r re n t L i mi t (mA )
PSRR
35
40
45
50
55
60
65
70
0.1 1 10 100
Frequency (kH z)
PSRR (dB
)
PSRR
35
40
45
50
55
60
65
70
0.1 1 10 100
Frequency (kHz)
PSRR (dB
)
90°C
-45°C
25°C
C
TA = 25°C
VOUT = 1.8V
VOUT=3.3V
VOUT = 1.8V
VIN = 2.8V
CIN = COUT = 1uF
TA = 25°C
VOUT = 3.3V
VIN = 4.3V
CIN = COUT = 1uF
TA = 25°C
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 7 of 13
www.diodes.com January 2011
© Diodes Incorporated
Typical Characteristics (Continued)
Start-Up Time (No Load)
Time (50us/div)
Start-Up Time (300mA Load)
Time (50us/div)
Line Transient Response
Time (50us/div)
Line Transient Response
Time (50us/div)
Load Transient Response
Time (100us/div)
Load Transient Response
Time (100us/div)
VEN = 0 to 2V (1V/div)
VIN = 4.3V
CIN = COUT =1uF
VOUT = 3.3V (1V/div)
VEN = 0 to 2V (1V/div)
VIN = 4.3V
CIN = COUT =1uF
VOUT = 3.3V (1V/div)
VOUT = 3.3V (50mV/div)
IOUT = 300mA (300mA/div)
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)
IOUT = 300mA (300mA/div)
IOUT = 300mA (300mA/div)
IOUT = 1mA to 300mA
(100mA/div)
VOUT = 3.3V
(100mV/div)
Tr = Tf = 10us
VIN =4.3V
VOUT = 0.8V
(100mV/div)
IOUT = 1mA to 300mA
(100mA/div)
Tr = Tf = 10us
VIN = 2V
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 8 of 13
www.diodes.com January 2011
© Diodes Incorporated
Application Note
Input Capacitor
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.
Output Capacitor
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.
Adjustable Operation
The AP7331 provides output voltage from 0.8V to 5.0V
through external resistor divider as shown below.
1uF
IN
GND
EN
OUT
Enable ADJ
R2
R1
1uF
VIN VOUT
AP7331
The output voltage is calculated by:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛+= 2
R1
R
1
REF
V
OUT
V
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:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−= 1
REF
VOUT
V
2
R
1
R
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.
ON/OFF Input Operation
The AP7331 is t urned on by setting t he 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
Characteristics section under VIL and VIH.
Current Limit Protection
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.
Short Circuit Protection
When OUT pin is short-circ uit to GND or OUT pin voltag e
is less than 200mV, short circuit protection will be
triggered and clamp the output current to approximately
100mA. This feature protects the regulator from over-
current and damage due to overheating.
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 AP733 1 is able to provide full po wer 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 exte nd batt ery lif e for mobile pho nes and ot her
portable devices.
Fast Transient Respon se
Fast transient response LDOs can extend battery life.
TDMA-based cell phone protocols such as Global
System for Mobile Communications (GSM) have a
transmit/receiv e dut y factor of only 1 2.5 perc ent, enabli ng
power savings by putting much of the baseband circuitry
into standby mode in between transmit cycles. In
baseband circuits, the load often transitions virtually
instantaneousl y 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 conventi onal, general-purpose LDOs.
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 9 of 13
www.diodes.com January 2011
© Diodes Incorporated
Application Note (Continued)
Fast Transient Respon se (Continued)
The AP7331’s fast transient response from 0 to 300mA
provides stable voltage supply for fast DSP and GSM
chipset with fast changing load.
Small Overshoot and Undershoot
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.
Low Quiescent Current
The AP7331, consuming only around 65µA for all input
range and output loading, provides gr eat power saving in
portable and low power applications.
Wide Output Range
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
Packing
Package Green
W : SOT25 G : Green 7 : Ta pe & Reel
SN : DFN2020-6
Blank : ADJ
10 : 1.0V
Output
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
28 : 2.8V
30 : 3.0V
33 : 3.3V
20 : 2.0V
Device Package Code Packaging
(Note 7) 7” Tape and Reel
Quantity Part Number Suffix
AP7331-XXWG-7 W SOT25 3000/Tape & Reel -7
AP7331-XXSNG-7 SN DFN2020-6 3000/Tape & Reel -7
Note: 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
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 10 of 13
www.diodes.com January 2011
© Diodes Incorporated
1 2 3
5
7
4
XX YW X
( Top View )
XX : Identification code
W : Week : A~Z : 1~26 week;
X : A~Z : Green
Y : Year 0~9
a~z : 27~52 week; z represents
52 and 53 week
Device Package Identification Code
AP7331-ADJ SOT25 QJ
AP7331-10 SOT25 QK
AP7331-12 SOT25 QL
AP7331-15 SOT25 QM
AP7331-18 SOT25 QN
AP7331-20 SOT25 QT
AP7331-25 SOT25 QP
AP7331-28 SOT25 QQ
AP7331-30 SOT25 QR
AP7331-33 SOT25 QS
2. DFN2020-6
Y : Year : 0~9
( Top View )
Y WX
XX XX : Identification Code
X : A~Z : Gree n
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
Device Package Identification Code
AP7331-ADJ DFN2020-6 QJ
AP7331-10 DFN2020-6 QK
AP7331-12 DFN2020-6 QL
AP7331-15 DFN2020-6 QM
AP7331-18 DFN2020-6 QN
AP7331-20 DFN2020-6 QT
AP7331-25 DFN2020-6 QP
AP7331-28 DFN2020-6 QQ
AP7331-30 DFN2020-6 QR
AP7331-33 DFN2020-6 QS
Package Outline Dimensions (All Dimensions in mm)
1. Package Type: SOT25
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 11 of 13
www.diodes.com January 2011
© Diodes Incorporated
2. Package Type: DFN2 020-6
0.05 M C A B
B
0.15
Bottom View
A
C
0/0.05
0.57/0.63
0.15max.
C
0.15 C
2x-
2x
0.08 C
0.05 C
Seating plane
1.45/1.65
1.95/2.075
0.30/0.40
0.2/0.3
0.65nom.
0.76/0.96
1.95/2.075
Pin#1 ID
R0.1
Marking
0.43mon.
(Active area depth)
Tape Orientation (Note 8)
DFN2020-6
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 12 of 13
www.diodes.com January 2011
© Diodes Incorporated
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
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2 13 of 13
www.diodes.com January 2011
© Diodes Incorporated
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