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DT3910 -- 5V 1A Current Limit USD Switcher

Issue Date: 2013-12-13
Description:

The DT3910 is an integrated 80mΩ power switch with programmable current limiting for self-powered and bus-powered Universal Series Bus (USB) applications. A built-in charge pump is used to drive the MOSFET that is free of parasitic body diode to eliminate any reversed current flow across the switch when it is powered off in case the output is pulled higher than the input voltage. Its low quiescent current and small package is particularly suitable in battery-powered portable equipment. Several protection functions include soft start to limit inrush current during plug-in, current limiting at 1.1A to meet USB power requirement, and thermal shutdown to protect damage under over current conditions. The DT3910 is available in SOT23-5 package.


GENERAL DESCRIPTION

The DT3910 is an integrated 80mΩ power switch with programmable current limiting for self-powered and bus-powered Universal Series Bus (USB) applications. A built-in charge pump is used to drive the MOSFET that is free of parasitic body diode to eliminate any reversed current flow across the switch when it is powered off in case the output is pulled higher than the input voltage. Its low quiescent current and small package is particularly suitable in battery-powered portable equipment.

Several protection functions include soft start to limit inrush current during plug-in, current limiting at 1.1A to meet USB power requirement, and thermal shutdown to protect damage under over current conditions.

The DT3910 is available in SOT23-5 package.

 

FEATURES

  • Distribution voltages: 2.4V to 5.5V
  • Ultra-low RDSON: 80mΩ
  • Programmable current limit
  • Maximum Output Current: 1.1A
  • Low Quiescent Current: 16uA
  • Reverse blocking
  • Soft Start Function
  • Built-in Short-circuit Protection
  • Over temperature shutdown and automatic retry
  • Automatic output discharge at shutdown
  • Package type: SOT23-5

APPLICATIONS

  • USB 3G Datacard
  • USB Dongle
  • MiniPCI Accessories
   

TYPICAL APPLICATION CIRCUIT

PIN ASSIGNMENT

 
PIN DESCRIPTION

PIN No

SYMBOL

DESCRIPTTION

1

OUT

Output pin.

2

GND

Ground

3

ISET

Current Limit Programming Pin.

4

EN

Chip Enable pin.

5

IN

Power Supply Input.

 

 

ABSOLUTE MAXIMUM RATINGS (Note 1)

SYMBOL

ITEM

RATING

UNIT

VIN

Supply Voltage

-0.3~7.0V

V

VIO

OUT, EN, ISEN pin Voltage

-0.3V to (VIN+0.3V)

V

PD

Maximum Power Dissipation SOT23-5

400

mW

PTR

Package Thermal Resistance SOT23-5, ΘJA

200

?W

TJ

Junction Temperature Range

-40~125

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TSTG

Storage Temperature Range

-65~150

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TSOLDER

Lead Temperature (Soldering)

260? 10s

 

 Note1: Absolute Maximum Ratings are threshold limit values that must not be exceeded even for an instant under any condition. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits.

 

RECOMMANDED OPERATING RANGE

SYMBOL

ITEMS

VALUE

UNIT

VIN

VIN Supply Voltage

2.4 to 5.5

V

TOPT

Operating Temperature

-40 to +85

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