AiT A4775E5R Schematic [ru]

AiT Semiconductor Inc.

www.ait-ic.com

A4775

SWITCH

70mΩ, 3A SMART UNIVERSAL POWER SWITCH

DESCRIPTION

FEATURES

The A4775 is a low voltage, high performance
single N-MOSFET power switch, designed for
power rail on/off control with low R

DS(ON)

≈70mΩ and

full protection functions. The A4775 equipped with a
charge pump circuitry to drive the internal MOSFET
switch . In order to fit different application, an ISET
pin is offered for current limit point setting, a resistor
from ISET to ground sets the current limit for the
switch.

Additional features include soft-start to limit inrush
current during plug-in, thermal shutdown to prevent
catastrophic switch failure from high-current loads,
Output anti back irrigation Protection whether EN
pin is connected GND or VIN, under-voltage lockout
(UVLO) to ensure that the device remains off
unless there is a valid input voltage present, a
precision resistor-programmable output current limit
up to 3.5A. Besides, the lower quiescent current as

40μA making this device ideal for portable

battery-operated equipment.

The A4775 is available in SOT-25 package.

ORDERING INFORMATION

Package Type

Part Number

SOT-25

E5

A4775E5R

A4775E5VR

Note

V: Halogen free Package
R: Tape & Reel

AiT provides all RoHS products
Suffix “ V “ means Halogen free Package

 Adjustable Current Limiting up to 3.5A
 Built-In (Typically 70mΩ) N-MOSFET
 Reverse Current Flow Blocking (no body diode)
 Output Can Be Forced Higher than Input (Off or

On State)

 Low Supply Current :

40μA Typical at Switch on State
Less than 1μA Typical at Switch Off State

 Guaranteed Continuous Load Current : 2.1A
 Wide Input Voltage Ranges : 2V to 5.5V
 Hot Plug-In Application (Soft-Start)
 1.7V Typical Under-Voltage Lockout (UVLO)
 Thermal Shutdown Protection
 Available in SOT-25 Package

APPLICATION

 USB 3G Datacard
 USB Dongle
 MiniPCI Accessories
 LCD Monitor, LCD-TV
 USB Power Module for ADSL
 Information Appliance and Set-Top Box
 Battery-Powered Equipment
 Hot-Plug Power Supplies
 ACPI Power Distribution
 PCI Bus Power Switching
 Motherboard & Notebook PCs
 PC Card Hot Swap Application

TYPICAL APPLICATION

REV1.1 - JUN 2014 RELEASED, JUN 2014 UPDATAED - - 1 -

AiT Semiconductor Inc.

www.ait-ic.com

A4775

SWITCH

70mΩ, 3A SMART UNIVERSAL POWER SWITCH

PIN DESCRIPTION

Top View

Pin #

Symbol

Function

1

OUT

Output Voltage.

2

GND

Ground. 3 ISET

Current Limit Programming Input.

4

EN

Chip Enable (Active High).

5

IN

Power Input Voltage.

REV1.1 - JUN 2014 RELEASED, JUN 2014 UPDATAED - - 2 -

AiT Semiconductor Inc.

www.ait-ic.com

A4775

SWITCH

70mΩ, 3A SMART UNIVERSAL POWER SWITCH

ABSOLUTE MAXIMUM RATINGS

Supply Voltage

6.5V

Chip Enable Input Voltage

-0.3V~6.5V

PD, Power Dissipation @ TA = 25°C

SOT-25

0.6W

Package Thermal Resistance

SOT-25

200°C/W

Junction Temperature

125℃

Lead Temperature (Soldering, 10 sec.)

260°C

Storage Temperature Range

-65°C ~150°C

ESD Susceptibility

HBM (Human Body Mode)

8kV

MM (Machine Mode)

800V

Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and
operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

REV1.1 - JUN 2014 RELEASED, JUN 2014 UPDATAED - - 3 -