Uses Low Equivalent Series Resistance (ESR) Ceramic
Capacitors
Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
Factory-Programmed Output Voltages
SOT23 6-Pin or SC70JW 8-Pin Package
General Description
The AAT3238 MicroPower low dropout (LDO) linear regu-
lator is ideally suited for portable applications where
very fast transient response, extended battery life, and
small size are critical. The AAT3238 has been specifically
designed for high-speed turn-on and turn-off perfor-
mance, fast transient response, good power supply rip-
ple rejection (PSRR), and is reasonably low noise, mak-
ing it ideal for powering sensitive circuits with fast
switching requirements.
Other features include low quiescent current, typically
70µA, and low dropout voltage, typically less than
400mV at the maximum output current level of 300mA.
The device is output short-circuit protected and has a
thermal shutdown circuit for additional protection under
extreme operating conditions.
The AAT3238 also features a low-power shutdown mode
for extended battery life. A reference bypass pin has
been provided to improve PSRR performance and output
noise by connecting a small external capacitor from the
AAT3238’s reference output to ground.
The AAT3238 is available in a Pb-free, space-saving
6-pin SOT23 or 8-pin SC70JW package in factory-pro-
grammed voltages.
Applications
•
•
•
•
•
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
V
IN
IN
OUT
V
OUT
AAT3238
ON/OFF
EN
GND
1µF
10nF
2.2µF
BYP
GND
GND
3238.2008.05.1.7
www.analogictech.com
1
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPower
TM
High Performance LDO Linear Regulator
Pin Descriptions
Pin #
SOT23-6
1
2, 5
3
4
6
SC70JW-8
5, 6
8
7
1
2, 3, 4
Symbol
IN
GND
EN
BYP
OUT
Function
Input voltage pin; should be decoupled with 1µF or greater capacitor.
Ground connection pin.
Enable pin; this pin should not be left floating. When pulled low, the PMOS pass transistor
turns off and all internal circuitry enters low-power mode, consuming less than 1µA.
Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF capacitor to
GND. This will also provide a soft-start function.
Output pin; should be decoupled with 2.2µF ceramic capacitor.
Pin Configuration
SOT23-6
(Top View)
SC70JW-8
(Top View)
IN
GND
EN
1
6
OUT
GND
BYP
BYP
OUT
OUT
OUT
1
2
3
4
8
7
6
5
2
5
3
4
GND
EN
IN
IN
2
www.analogictech.com
3238.2008.05.1.7
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPower
TM
High Performance LDO Linear Regulator
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ENIN(MAX)
I
OUT
T
J
Description
Input Voltage
Maximum EN to Input Voltage
DC Output Current
Operating Junction Temperature Range
Value
6
0.3
P
D
/(V
IN
- V
O
)
-40 to 150
Units
V
V
mA
°C
Recommended Operating Conditions
Symbol
V
IN
T
Description
Input Voltage
Ambient Temperature Range
2
Rating
(V
OUT
+ V
DO
) to 5.5
-40 to +85
Units
V
°C
Thermal Information
3
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
Rating
150
667
Units
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a demo board.
3. To calculate minimum input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
as long as V
IN
≥
2.5V.
3238.2008.05.1.7
www.analogictech.com
3
PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPower
TM
High Performance LDO Linear Regulator
Electrical Characteristics
1
V
IN
= V
OUT(NOM)
+ 1V for V
OUT
options greater than 1.5V. V
IN
= 2.5V for V
OUT
≤
1.5V. I
OUT
= 1mA, C
OUT
= 2.2µF, C
IN
= 1µF,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
V
OUT
I
OUT
V
DO
I
SC
I
Q
I
SD
∆V
OUT
/
V
OUT
*∆V
IN
∆V
OUT
(line)
∆V
OUT
(load)
t
ENDLY
V
EN(L)
V
EN(H)
I
EN
PSRR
T
SD
T
HYS
e
N
TC
Description
Output Voltage Tolerance
Output Current
Dropout Voltage
2, 3
Short-Circuit Current
Ground Current
Shutdown Current
Line Regulation
Dynamic Line Regulation
Dynamic Load Regulation
Enable Delay Time
Enable Threshold Low
Enable Threshold High
Leakage Current on Enable Pin
Power Supply Rejection Ratio
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Output Noise
Output Voltage Temperature Coefficient
Conditions
I
OUT
= 1mA to 300mA
T
A
= 25°C
T
A
= -40 to 85°C
Min
-1.5
-2.5
300
Typ
Max
1.5
2.5
Units
%
mA
mV
mA
µA
%/V
mV
mV
µs
V
V
µA
dB
°C
°C
µVrms
ppm/°C
V
OUT
> 1.2V
I
OUT
= 300mA
V
OUT
< 0.4V
V
IN
= 5V, No Load, EN = V
IN
V
IN
= 5V, EN = 0V
V
IN
= V
OUT
+ 1 to 5.0V
V
IN
= V
OUT
+ 1V to V
OUT
+ 2V, I
OUT
= 300mA,
T
R
/T
F
= 2µs
I
OUT
= 1mA to 300mA, T
R
< 5µs
BYP = Open
70
400
600
125
600
µA
1
0.09
2.5
60
15
0.6
1.5
V
EN
= 5V
I
OUT
= 10mA, C
BYP
= 10nF
1kHz
10kHz
1MHz
67
47
45
145
12
50
22
1
1. The AAT3238 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
Modeling and design for winding loss of transformer with central tapAbstract: The coil loss of the center-tapped high-frequency power transformer is modeled and studied by using the current component ...
[i=s] This post was last edited by jameswangsynnex on 2015-3-3 20:01 [/i]A conversion voltage of +/- 15V is required, and the grayscale is only 16 levels (4bit)...
I bought an automatic mobile phone cleaner during a previous event. After a long wait, JD.com delivered the item to my company over the weekend. I unpacked it in the morning to take a look.
I thought ...
[b] [/b] Thank you for your attention and support to the forum. Here we have selected the netizens who have made outstanding contributions to the forum in September.[align=left][color=#000][font=Helve...
1. Introduction
RFID (radio frequency identification) is a non-contact automatic identification technology that emerged in the 1990s. It uses the characteristics of radio frequency signal prop...[Details]
0 Introduction
With the development of my country's economy, the number of motor vehicles continues to increase. The growth of existing roads and other hardware facilities can no longer meet t...[Details]
Electronic systems are located at different points on the automotive power bus and therefore often need to operate under very stringent power requirements. These include load dump, cold crank, very lo...[Details]
1. Principle of displacement angle sensor
The angle sensor is used to detect angles. It has a hole in its body that fits the LEGO axle. When connected to the RCX, the angle sensor counts once ...[Details]
A multi-point temperature control heating control system was designed using the SST89E564RC single-chip microcomputer and a new temperature measuring device. The heating system can be controlled in...[Details]
1. Overview
The Virtual CAN Interface (VCI) function library is an application program interface specifically provided for the use of ZLGCAN devices on PCs. The functions in the library ar...[Details]
1. Project Introduction
Shandong Dezhou Xingtai Paper Co., Ltd. is a newly built high-end paperboard production enterprise with domestic leading level established by Shandong Zhaodongfang Pape...[Details]
my country is a big country in agriculture, grain production and consumption. Grains are a necessary condition for our nation to survive and develop. The flour processing industry will exist forever w...[Details]
1. Introduction
Testing the temperature of steel billets before rolling is an important measure to ensure the quality of steel. Traditional manual testing is difficult to ensure product qu...[Details]
Experimental tasks
A DS18B20 is used to form a temperature measurement system. The temperature measurement accuracy reaches 0.1 degrees. The temperature range is between -20 degrees and +50 de...[Details]
Among the many members of the single-chip microcomputer family, the MCS-51 series of single-chip microcomputers has occupied the main market of industrial measurement and control and automation eng...[Details]
From the previous section, we have learned that the timer/counter in the microcontroller can have multiple uses, so how can I make them work for the purpose I need? This requires setting the timer/...[Details]
This paper designs a 16x16LED Chinese character display bar based on single-chip dynamic scanning control, briefly analyzes the principle of Chinese character display, and studies how the LED displ...[Details]
At very low temperatures, certain metals and alloys lose their resistance to electric
current
and become
superconductors
. Two parameters that are often measured are the transition ...[Details]
In 2012, more than half of the cars in the European, Japanese and American car markets will be equipped with color displays, navigation systems, satellite communications and other in-vehicle infota...[Details]
Analog electronics
京公网安备 11010802033920号
EEWORLD
