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AAT4702 Datasheet

Auto-Restarting Current Limiting Load Switch

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DATA SHEET
AAT4702
Auto-Restarting Current Limiting Load Switch with LDO Regulator
General Description
The AAT4702 SmartSwitch™ is a member of Skyworks'
Application Specific Power MOSFET™ (ASPM™) product
family. This device integrates a high side P-channel
MOSFET current limiting load switch with a nanopower
low dropout (LDO) linear voltage regulator, making the
AAT4702 ideal for use in load current protected applica-
tions that also require a system power supply. The load
switch operates with input voltages ranging from 2.4V to
5.5V, making it ideal for 2.5V, 3V, and 5V systems. A
fault flag is provided to alert the system to an over-
current event. The fault flag has a 5ms blanking time to
prevent from reporting false events such as inrush cur-
rents during system startup.
The load switch current limit is 150mA by default or pro-
grammed up to 1A through an external set resistor.
The AAT4702 LDO linear regulator is designed to deliver
a regulated 1.8V supply voltage for load levels up to
100mA. The regulator section may be powered directly
from an input source supply or from the load switch out-
put.
The AAT4702 is offered in a Pb-free, space-saving 8-pin
2x2mm FTDFN22 package, and is specified for operation
over the -40°C to +85°C ambient temperature range.
Features
Load Switch:
 2.4V-5.5V Input Voltage Range
 150mA Default Current Limit Level
 270mTypical RDS(ON) at 2.4V
 400ns Response to Short Circuit
 Reverse Voltage Protection
 Current Limit Shutdown with Output Pull Down
 Auto Restart with 40ms Timer
 5ms Fault Blanking Timeout
 Under-Voltage Lockout Protection
LDO Regulator:
 Output Current up to 100mA
 1.8V Output Voltage with ±2% Accuracy
 Thermal and Short Circuit Protection
 Active Shutdown Output Pull-Down
 Low Quiescent Current 15μA Typical for Switch and
LDO
 Less than 1μA Shutdown Current
 Only 1μF Ceramic Output Capacitor Required
 Available in FTDFN22-8L Package.
Applications
 Cell Phones
 Device Peripheral Ports
 Fingerprint Sensors
 Hot Swap Supplies
 Media Players
 Notebook Computers
Typical Application
INPUT
ENABLE
FAULT FLAG
1μF
N/C
IN OUT
AAT4702
SET IN_REG
ON / ON
VREG
FLT
GND
1μF
OUTPUT
LDO REG OUTPUT
1μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201964A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 17, 2012
1




Skyworks

AAT4702 Datasheet Preview

AAT4702 Datasheet

Auto-Restarting Current Limiting Load Switch

No Preview Available !

DATA SHEET
AAT4702
Auto-Restarting Current Limiting Load Switch with LDO Regulator
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
Symbol
OUT
IN_REG
VREG
GND
SET
FLT
ON (ON)
IN
Description
Current limited P-channel MOSFET load switch output. A 0.47μF to 1μF ceramic capacitor connected from
OUT to GND is recommended for best circuit response.
LDO regulator power input. Connect to IN to power from a common input supply with the load switch, in
which case, bypass with a 1μF ceramic capacitor connected between this pin and ground. Alternatively, this
pin may be powered from the load switch output by connecting IN_REG to OUT; a 1μF or greater ceramic
capacitor should be placed between the OUT pin and ground for this application
LDO regulator output. Connect a 1μF or larger capacitor from VREG to GND for best operating performance.
IC ground pin.
Current limit set input. Connect a resistor from SET to ground to program current limit set point for the load
switch. Or leave open for 150mA default current limit level.
Fault ag, open drain output. Pull to a logic high level through an external resistor for normal operation.
Pulled low when fault is present. Leave open if unused.
Enable input for load switch and LDO regulator.
AAT4702 -1: Active low; pull to a logic low level to enable.
AAT4702 -2: Active high; pull to a logic high level to enable.
Input to the P-channel MOSFET source. Connect a 1μF capacitor from IN to GND.
Pin Configuration
FTDFN22-8L
(Top View)
OUT
IN_REG
VREG
GND
1
2
3
4
8 IN
7 ON (ON)
6 FLT
5 SET
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 201964A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 17, 2012


Part Number AAT4702
Description Auto-Restarting Current Limiting Load Switch
Maker Skyworks
Total Page 20 Pages
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