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AP7335A
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Description
The AP7335A is a 300mA, 5.0V fixed output voltage, low
dropout linear regulator with ±1% output voltage accuracy.
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 35μA. Built-in current-limit and thermal-shutdown
functions prevent IC from damage in fault conditions.
This device is only available as 5.0V fixed version. Please
contact your local sales office for any other voltage options.
The AP7335A is packaged in SOT25 and U-DFN2020-6.
Applications
• Smart Phones
NEW PRODUCT
• MP3/MP4
• Battery-powered devices
• Bluetooth headset
• Battery Charger
• LCD TV
• Multifunction Monitors
Note: 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
.
Pin Assignments
IN
1
GND
2
EN
34
Features
• 300mA Low Dropout Regulator with EN
• Very low I
• Fixed output at 5.0V
o V
• High PSRR: 65dB at 1kHz
• Fast start-up time 220µs
• Stable with low ESR, 1µF ceramic output capacitor
• Excellent Load/Line Transient Response
• Low dropout 150mV at 300mA
• Current limit and short circuit protection
• Thermal shutdown protection
• Ambient temperature range -40ºC to 85°C
• SOT25, and U-DFN2020-6 Available in “Green”
Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
SOT25
(Fixed Output)
35µA
Q
5.5V
IN MIN
5
OUT
NC
1
EN
GND
2
3
IN
U-DFN2020-6
(Fixed Output)
6
5
4
NC
NC
OUT
Typical Application Circuit
V
AP7335A
Document number: DS35267 Rev. 2 - 2
IN
IN
OUT
AP7335
1uF
Enable
EN
GND
Fixed Output
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V
OUT
1uF
October 2011
© Diodes Incorporated
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AP7335A
Pin Descriptions
Pin Number
Pin Name
IN 1 3 Voltage input pin. Bypass to ground through at least 1µF MLCC capacitor
GND 2 2 Ground
EN 3 1 Enable input, active high
ADJ - - Output feedback pin
NC 4 5, 6 No connection
OUT 5 4 Voltage output pin. Bypass to ground through 1µF MLCC capacitor
Functional Block Diagram
SOT25
(fixed)
U-DFN2020-6
(fixed)
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Description
NEW PRODUCT
IN
EN
Gate
Driver
Fixed Version
Current Limit
and Thermal
Shutdown
0.8V
OUT
R
R
GND
AP7335A
Document number: DS35267 Rev. 2 - 2
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AP7335A
Absolute Maximum Ratings
Symbol Parameter Ratings Unit
ESD HBM Human Body Model ESD Protection 2000 V
ESD MM Machine Model ESD Protection 200 V
VIN
OUT, EN Voltage
Continuous Load Current per Channel Internal Limited
TST
TJ
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional
operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by
exposure to absolute maximum rating conditions for extended periods of time.
Recommended Operating Conditions
NEW PRODUCT
Symbol Parameter Min Max Unit
V
IN
I
OUT
T
A
Notes: 2. The device maintains a stable, regulated output voltage without a load current.
3. V
IN(MIN)
Input Voltage 6.5 V
Storage Temperature Range -65 to 150 °C
Maximum Junction Temperature 150 °C
Input voltage (Note 3) 2 (Note 3) 6 V
Output Current (Note 2) 0 300 mA
Operating Ambient Temperature -40 85 °C
= 5.5V for 5.0V, V
at 300mA I
OUT
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
+ 0.3
V
IN
OUT
V
AP7335A
Document number: DS35267 Rev. 2 - 2
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300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Electrical Characteristics
= 25oC, V
(T
A
Symbol Parameter Test Conditions Min Typ. Max Unit
V
OUT
ΔV
OUT
/V
/ΔV
IN
ΔV
OUT
/V
OUT
V
DROPOUT
I
Q
I
SHDN
I
LEAK
tST
NEW PRODUCT
PSRR PSRR
I
SHORT
I
LIMIT
V
IL
V
IH
I
EN
T
SHDN
T
HYS
θ
JA
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.
5. Test condition for all packages: Device mounted on FR-4 substrate PC board, 1oz copper, with minimum recommended pad layout.
= 5.5 to 6V, C
IN
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage (Note 4)
Input Quiescent Current
Input Shutdown Current
Input Leakage Current
Start-up Time
Short-circuit Current
Current limit
EN Input Logic Low Voltage
EN Input Logic High Voltage
EN Input Current
= 1μF, C
IN
OUT
= 1μF, V
= 2V, unless otherwise stated)
EN
T
= -40oC to 85oC,
A
I
= 10% of I
OUT
OUT-Max
VIN = 5.5V to 6V,
V
= VIN, I
EN
= 5.5V to 6V,
V
IN
I
= 1mA to 300mA
OUT
I
= 300mA
OUT
V
= VIN, I
EN
V
= 0V, I
EN
V
= 0V, OUT grounded
EN
V
= 0V to 2.0V in 1μs,
EN
I
= 300mA
OUT
V
= 5.5VDC + 0.5V
IN
f = 1kHz, I
VIN = V
IN-Min
V
< 0.2V (fixed) or
OUT
V
= V
IN
IN-Min
V
OUT/ROUT
V
= V
IN
IN-Min
V
= V
IN
IN-Min
V
= 0V or V
IN
OUT
OUT
= 0mA
OUT
= 50mA
OUT
to V
to V
= 1.2A
to V
to V
IN-Max
= 1mA
= 0mA
IN-Max
IN-Max
IN-Max
IN-Max
ppAC
-1 1 %
0.02 0.20 %/V
-0.6 0.6 %
150 200 mV
35 80 μA
0.1 1
0.1 1
220 μs
,
,
,
65 dB
160 mA
400 650 mA
0.4 V
1.4 V
-1 1 μA
Thermal shutdown threshold 145 °C
Thermal shutdown hysteresis 15 °C
Thermal Resistance Junction-to-Ambient
SOT25 (Note 5) 187
U-DFN2020-6 (Note 5) 251
AP7335A
μA
μA
o
C/W
AP7335A
Document number: DS35267 Rev. 2 - 2
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μ
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
Typical Performance Characteristics
AP7335A
LOW DROPOUT LINEAR REGULATOR
NEW PRODUCT
V
EN
V
IN
C
IN=COUT
V
=5.0V (2V/div)
OUT
with no load
Line Transient Response
V
IN
Tr=Tf=2μs
C
Start-Up Time
=0 to 2V (1V/div)
=5.5V
=1μF
Time (40μs/div)
=5.5V to 6.0V (1V/div)
=none, C
IN
OUT
=1μF
Start-Up Time
=0 to 2V (1V/div)
V
EN
=5.5V
V
IN
=1μF
=5.0V (2V/div)
V
OUT
C
IN=COUT
with 300mA load
Time (40μs/div)
Line Transient Response
V
=5.5V to 6.0V (1V/div)
IN
Tr=Tf=2μs
=none, C
C
IN
OUT
=1μF
V
IN=VEN
C
IN=COUT
Tr=Tf=1
I
OUT
V
=5.0V (10mV/div)
OUT
=30mA(50mA/div)
I
OUT
Time (40μs/div)
Load Transient Response
=5.5V
=1μF
s
=5.0V (100mV/div)
V
OUT
=10mA to 150mA (200mA/div)
Time (100μs/div)
V
=5.0V (10mV/div)
OUT
I
=300mA(200mA/div)
OUT
Time (40μs/div)
Load Transient Response
IN=VEN
IN=COUT
=5.5V
=1μF
V
C
Tr=Tf=1μs
V
=5.0V (100mV/div)
OUT
=10mA to 300mA (200mA/div)
I
OUT
Time (100μs/div)
AP7335A
Document number: DS35267 Rev. 2 - 2
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Typical Performance Characteristics (cont.)
NEW PRODUCT
80
70
60
50
40
30
PSRR(dB)
VIN=5.5V+0.5V
20
10
0
0.1 1 10 100
V
OUT
=none, C
C
IN
=25°C
T
A
=5.0V
PSRR
I
=50mA
OUT
ppAC
=1μF
OUT
Frequency(kHz)
I
OUT
=300mA
AP7335A
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Dropout Voltage vs Output Current
200
V
=5.0V
OUT
150
100
25°C
50
Dropout Volt age(mV )
0
0 50 100 150 200 250 300
Output Current (m A )
90°C
-45°C
Sh o rt-c i r cu it Cur r en t vs Te mpera tu r e
200
800
Current limit vs Temperature
VIN=5.5V
175
150
125
Short -circuit Current (m A)
100
-50 -25 0 25 50 75 100 125
Temperature(℃)
700
600
Current limit(mA)
500
VIN=5.5V
=5.0V
V
400
OUT
-50 -25 0 25 50 75 100 125
Temperature(℃)
AP7335A
Document number: DS35267 Rev. 2 - 2
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Application Note
AP7335A
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Input Capacitor
A 1μF ceramic capacitor is recommended between IN 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 reduce
noise. For PCB layout, a wide copper trace is required for
both IN and GND pins. A lower ESR capacitor type allows
the use of less capacitance, while higher ESR type
requires more capacitance.
Output Capacitor
The output capacitor is required to stabilize and improve
the transient response of the LDO. The AP7335A is stable
with very small ceramic output capacitors. Using a ceramic
capacitor value that is at least 1μF with ESR > 15mΩ on
the output ensures stability. Higher capacitance values
help to improve line and load transient response. The
output capacitance may be increased to keep low
undershoot and overshoot. Output capacitor must be
NEW PRODUCT
placed as close as possible to OUT and GND pins.
Region of Stabl e C
100
10
1
Stable Range
ESR (Ω)
0.1
OUT
C
0.01
0.001
0 50 100 150 200 250 300
Load Current (mA)
ESR vs. Load Current
OUT
Unstable Range
VIN=5.5V
C
IN=COUT
Unstable Range
No Load Stability
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 AP7335A 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 Characteristics section
under V
and VIH.
IL
AP7335A
Document number: DS35267 Rev. 2 - 2
=1μF
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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
650mA 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, short circuit
protection will be triggered and clamp the output current
to approximately 160mA. 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 +145°C, allowing the
device to cool down. When the junction temperature
reduces to approximately +130°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 AP7335A is able to provide full power
in as little as tens of microseconds, typically 220µs,
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 LDO 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 LDO.
The AP7335A’s fast transient response from 0 to 300mA
provides stable voltage supply for fast DSP and GSM
chipset with fast changing load.
Low Quiescent Current
The AP7335A, consuming only around 35µA for all input
range, provides great power saving in portable and low
power applications.
October 2011
© Diodes Incorporated
Page 8
AP
XX
X
X
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
Application Note (cont.)
Power Dissipation
The device power dissipation and proper sizing of the
thermal plane that is connected to the thermal pad is
critical to avoid thermal shutdown and ensure reliable
operation. Power dissipation of the device depends on
input voltage and load conditions and can be calculated by:
= (V
- V
P
D
IN
OUT
) X I
OUT
Ordering Information
7335A-
AP7335A
LOW DROPOUT LINEAR REGULATOR
The maximum power dissipation, handled by the device,
depends on the maximum junction to ambient thermal
resistance, maximum ambient temperature, and
maximum device junction temperature, which can be
calculated by the following equation:
)AT-C145(
°+
R
JA
θ
X -
(max@TA) =
P
D
NEW PRODUCT
Output
50 : 5.0V
Package
SN :
U-DFN2020-6
Packing
7: Tape & Reel
AP7335A - XX X - X
Output
50 : 5.0V
Package
W : SOT25
Packing
7 : Tape & Reel
Device Package Code
AP7335A-XXW-7 W SOT25 3000/Tape & Reel -7
AP7335A-XXSN-7 SN U-DFN2020-6 3000/Tape & Reel -7
Note: 6. 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.
Packaging
(Note 6)
7”/13” Tape and Reel
Quantity Part Number Suffix
AP7335A
Document number: DS32259 Rev. 2 - 2
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October 2011
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Page 9
Marking Information
(1) SOT25
(2) U-DFN2020-6
NEW PRODUCT
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
( Top View )
W X
7
4
XX : Identification code
: Year 0~9
Y
W
: Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
: A~Z : G = Green
X
5
XX
Y
1 2 3
Device Package Identification Code
AP7335A-50 SOT25 TP
( Top View )
AP7335A
XX
W
Y
XX : Identification Code
X
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 : G = Green
Device Package Identification Code
AP7335A-50 U-DFN20 20-6 TP
AP7335A
Document Number: DS35267 Rev. 3 - 2
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Page 10
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
Package Outline Dimensions (cont.)
(1) Package Type: SOT25
A
B C
K
J
H
N
D
L
NEW PRODUCT
(2) Package Type: U-DFN2020-6
Pin#1 ID
A
A1
D2
D
D2/2
A3
E
E2
e
b
L
M
SEATING PLANE
AP7335A
LOW DROPOUT LINEAR REGULATOR
Dim Min Max Typ
SOT25
A 0.35 0.50 0.38
B 1.50 1.70 1.60
C 2.70 3.00 2.80
D
⎯ ⎯
H 2.90 3.10 3.00
J 0.013 0.10 0.05
K 1.00 1.30 1.10
L 0.35 0.55 0.40
M 0.10 0.20 0.15
N 0.70 0.80 0.75
0° 8°
α
All Dimensions in mm
U-DFN2020-6
Dim Min Max Typ
A 0.57 0.63 0.60
A1 0 0.05 0.03
A3
⎯ ⎯
b 0.20 0.30 0.25
D 1.95 2.075 2.00
D2 1.45 1.65 1.55
e
⎯ ⎯
E 1.95 2.075 2.00
E2 0.76 0.96 0.86
L 0.30 0.40 0.35
All Dimensions in mm
0.95
⎯
0.15
0.65
AP7335A
Document Number: DS35267 Rev. 3 - 2
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Page 11
Taping Orientation (Note 7)
For U-DFN2020-6
AP7335A
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
NEW PRODUCT
Note: 7. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
AP7335A
Document Number: DS35267 Rev. 3 - 2
www.diodes.com
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October 2011
© Diodes Incorporated
Page 12
NEW PRODUCT
AP7335A
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY A ND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporat ed does not assume any liability
arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any
license under its patent or trademark rights, nor the rights of others. A ny Customer or user of this document or products described
herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies
whose products are represented on Diodes Incorporated website, harml ess ag ai nst all damages.
Diodes Incorporated does not warrant or acc ept any liability whatsoever in respec t of any products purchas ed through unauthorized
sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless agai nst all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death ass ociated with such unintended or unauthorized application.
Products described herein may be covered by one or more United Stat es, international or foreign patents pending. Product names
and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without
the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herei n:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructi ons for us e provided
in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure t o perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness .
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
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 agai nst any damages arising out of the use of Diodes
Incorporated products in such safety-critic al, l ife support devic es or syst ems .
Copyright © 2011, Diodes Incorporated
www.diodes.com
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
IMPORTANT NOTICE
LIFE SUPPORT
AP7335A
Document Number: DS35267 Rev. 3 - 2
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