AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 1 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
• 300mA Low Dropout Regulator in 3-pin package
• Very low IQ over full load: 65µA
• Wide input voltage range: 2V to 6V
• 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
• SOT23 and SOT23R: Available in “Green” Molding
Compound ( No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
The AP7333 is a 300mA, fixed output voltage, low dropout linear
regulator. The device included pass element, error amplifier,
band-gap, current limit and thermal shutdown circuitry.
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 AP7333 is available in SOT23 packages with different
pin-outs.
Applications
• XDSL Router
• Wireless LAN Cards
• Desktop and Notebook Computers
• Battery Powered Equipments
• Mouse, Keyboards
Typical Application Circuit
1uF
IN
GND
OUT
1uF
VIN VOUT
AP7333
Features Description
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 2 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Ordering Information
AP7333 - XX XX G - 7
Packing
Package Green
SA : SOT23 G : Green 7 : Tape & Reel
SR : SOT23R
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 2) 7” Tape and Reel
Quantity Part Number Suffix
AP7333-XXSAG-7 SA SOT23 3000/Tape & Reel -7
AP7333-XXSRG-7 SR SOT23R 3000/Tape & Reel -7
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
2. 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.
Pin Assignment
(1) SOT23 (1) SOT23R
GND
( Top View )
3
IN 1
OUT 2
IN
( Top View )
3
GND 1
OUT 2
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 3 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Pin Descriptions
Pin Name Pin Num ber Description
SOT23 SOT23R
IN 1 3
Voltage input pin. Bypass to ground through at least 1µF
capacitor
OUT 2 2
Voltage output pin. Bypass to ground through 1µF ceramic
capacitor
GND 3 1 Ground
Functional Block Diagram
IN
GND
OUT
Gate
Driver
VREF
Current Limit
and Thermal
Shutdown R
R
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 4 of 12 NOVEMBER 2009
www.diodes.com © 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
Continuous Load Current Internal Limited
TOP Operating Junction Temperature Range -40 ~ 125 °C
TST Storage Temperature Range -65 ~150 °C
PD Power Dissipation (Note 3) SOT23 600 mW
SOT23R 540 mW
TJ Maximum Junction Temperature 150 °C
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VIN Input voltage 2 6 V
IOUT Output Curren t (Note 4) 0 300 mA
TA Operating Ambient Temperature -40 85 °C
Notes: 3. Ratings apply to ambient temperature at 25°C
4. The device maintains a stable, regulated output voltage without a load current.
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 5 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Electrical Characteristics
(TA = 25oC, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, unless otherwise stated)
Symbol Parameter Test Conditions Min Typ. Max Unit
IQ Input Quiescent Current IOUT = 0mA
⎯
55 75 μA
IOUT = 300mA 65 85
VDro
p
out Dropout Voltage (Note 5) IOUT = 300mA 300 550 mV
VOUT Output Voltage Accuracy TA = -40oC to 85oC,
IOUT = 30mA -2 2 %
ΔVOUT
/ΔVIN/V Line Regulation VIN = (VOUT +1V) to VIN-Max,
IOUT = 1mA 0.01 0.20 %/V
ΔVOUT
/VOUT Load Regulation VIN = (VOUT +1V) to VIN-Max,
IOUT from 1mA to 300mA -0.6 0.6 %
tST Start-up Time VIN = 0V t o 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
TSHDN Thermal Shutdown Threshold 140 °C
THYS Thermal Shutdown Hysteresis 15 °C
θJA Thermal Resistance Junction-to-Ambient SOT23 (Note 6) 207 oC/W
SOT23R (Note 6) 230 oC/W
Notes: 5. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value.
This paramet er only applies to output voltages above 1.8V.
6. Test conditions for SOT23 and SOT23R: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single
sided.
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 6 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Typical Performance Characteristics
Q ui escent Curr ent vs Input Voltage
Iload=0mA
48
50
52
54
56
58
60
2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6
Input Vol ta ge (V)
Ou tp u t Cu r r en t (mA)
Line Regulation (%/V)
-0.1
-0.06
-0.02
0.02
0.06
0.1
3.5 4 4.5 5 5.5 6
Input Voltage (V)
Output Voltage Variation (%/V)
Load Regulat ion (%)
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0 50 100 150 200 250 300
Output Curre nt (mA)
Outp u t V o ltag e Va riatio n (%)
Dropou t Vol t age
0
50
100
150
200
250
300
350
0 50 100 150 200 250 300
Ou tpu t Cu rr en t (m A)
Dropout Vol tage (mV)
Short Ci r cuit vs I nput Vol t age
75
80
85
90
95
100
105
3.5 4 4.5 5 5.5 6
Input Volta ge (V)
Ou tp u t Cu r r en t (mA)
Current Limit vs Input Voltage
400
450
500
550
600
3.5 4 4.5 5 5.5 6
Input Voltage (V)
Current Lim i t (mA)
90℃
-45℃
25℃
-45℃
90℃
25℃
25℃
-45℃
90℃
90℃
-45℃
25℃
90℃
25℃-45℃
Vout=2.5V
Vout=2.5V
Vin=Vout +1V
Vout=2.5V
Vin=Vout +1V
Vout=2.5V
Vout=2.5V Ta=25℃
Vout=2.5V
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 7 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Typical Performance Characteristics (Continued)
PSRR
35
40
45
50
55
60
65
70
75
0.1 1 10 100
Frequ ency (kHz)
P SRR ( d B)
PSRR
35
40
45
50
55
60
65
70
75
0.1 1 10 100
Fre quency (kHz)
P SRR ( d B)
Line Transient Response
Time (50us/div)
Line Transient Response
Time (50us/div)
Vout=1V (50mV/div)
Vin=2V to 3V (1V/div)
Tr=10us
Vout=1V (50mV/d iv)
Iout=300mA (300mA/div)
Vin=3V to 2V (1V/div)
Tr=10us
Iout=300mA (300mA/div)
Vout=1V
Vin=2V
Cin=Cout=1uF
Ta=25℃
Vout=2.5V
Vin=3.5V
Cin=Cout=1uF
Ta=25℃
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 8 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Typical Performance Characteristics (Continued)
Load Transient Response
Time (200us/div)
Load Transient Response
Time (200us/div)
Start-Up Time (No Load)
Time (50us/div)
Start-Up Time (300mA Load)
Time (50us/div)
Vin=0 to 3.5V (1V/div)
Cin=Cout=1uF
Vout=2.5V (1 V/ d i v)
Vout=1V
(100mV/div)
Iout=1mA to 300mA
(100mA/div)
Tr=Tf=10us
Vin=3.5V
Iout=1mA to 300mA
(100mA/div)
Tr=Tf=10us
Vin=2V Vout=2.5V
(100mV/div)
Vout=2.5V (1V/div)
Iout (300mA/div)
Vin=0 to 3.5V (1V/div)
Cin=Cout=1uF
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 9 of 12 NOVEMBER 2009
www.diodes.com © 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 copp er 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 AP7333 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 charact eristic is X7 R 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.
No Load Stability
No minimum load is required to keep the device stable. The
device will remain stable and regulated in no load condition.
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-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 over-current and damage due to
overheating.
Thermal Shutdown Protection
Thermal protection disables the output when the junction
temperature rises to app roximately +140° C, allowing the dev ice
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 turned on, the AP7333 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.
Fast Transient Response
Fast transient response LDOs can also 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 circui try into standb y 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.
The AP7333’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 AP7333 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 AP7333.
Lo w Quiescent Cu rren t
The AP7333, consuming only around 65µA for all input range
and output loading, provides great power saving in portable
and low power applications.
Wide Output Options
The AP7333, with multiples of fixed output voltage options,
provides a versatile LDO solution for many portable
applications.
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 10 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
Marking Information
(1) SOT23 and SOT23R
1 2
3
XX Y W 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
AP7333-10SA SOT23 JR
AP7333-12SA SOT23 JS
AP7333-15SA SOT23 JT
AP7333-18SA SOT23 JU
AP7333-20SA SOT23 JV
AP7333-25SA SOT23 JW
AP7333-28SA SOT23 JX
AP7333-30SA SOT23 JY
AP7333-33SA SOT23 JZ
AP7333-10SR SOT23R RA
AP7333-12SR SOT23R RB
AP7333-15SR SOT23R RC
AP7333-18SR SOT23R RD
AP7333-20SR SOT23R RE
AP7333-25SR SOT23R RF
AP7333-28SR SOT23R RG
AP7333-30SR SOT23R RH
AP7333-33SR SOT23R RJ
AP7333
300mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7333 Rev. 2 12 of 12 NOVEMBER 2009
www.diodes.com © Diodes Incorporated
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