L7985ATR datasheet(1/42 Pages) STMICROELECTRONICS

Part #	L7985ATR

Description	Voltage feed-forward

PDF	42 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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This is information on a product in full production.

September 2014

DocID022446 Rev 7

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L7985

2 A step-down switching regulator

Datasheet

- production data

Features

 2 A DC output current

 4.5 V to 38 V input voltage

 Output voltage adjustable from 0.6 V

 250 KHz switching frequency, programmable

up to 1 MHz

 Internal soft-start and enable

 Low dropout operation: 100% duty cycle

 Voltage feed-forward

 Zero load current operation

 Overcurrent and thermal protection

 VFQFPN 3 x 3 - 10L and HSOP8 package

Applications

 Consumer: STB, DVD, DVD recorder, car

audio, LCD TV and monitors

 Industrial: PLD, PLA, FPGA, chargers

 Networking: XDSL, modems, DC-DC modules

 Computer: optical storage, hard disk drive,

printers, audio/graphic cards

 LED driving

Description

The L7985/A is a step-down switching regulator

with a 2.5 A (minimum) current limited embedded

power MOSFET, so it is able to deliver up to 2 A

current to the load depending on the application

conditions. The input voltage can range from

4.5 V to 38 V, while the output voltage can be set

starting from 0.6 V to VIN. Requiring a minimum

set of external components, the device includes

an internal 250 kHz switching frequency oscillator

that can be externally adjusted up to 1 MHz. The

QFN and the HSOP packages with exposed pad

allow the reduction of RthJA down to 60 °C/W and

40 °C/W respectively.

Figure 1. Application circuit

VFQFPN10 3 x 3 mm

HSOP8 exp. pad

www.st.com

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