LT1578IS8 datasheet, PDF - EEWORLD Datasheet

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LT1578IS8: DescriptionConv DC-DC 4V to 15V Synchronous Step Down Single-Out 1.21V 8-Pin SOIC N; File Size361KB，28 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT1578IS8 Overview

Conv DC-DC 4V to 15V Synchronous Step Down Single-Out 1.21V 8-Pin SOIC N

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LT1578/LT1578-2.5

1.5A, 200kHz Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

1.5A Switch Current

High Efficiency—Low Loss 0.2Ω Switch

Constant 200kHz Switching Frequency

4V to 15V Input VoltageRange

Minimum Output: 1.21V

Low Supply Current: 1.9mA

Low Shutdown Current: 20µA

Easily Synchronizable Up to 400kHz

Cycle-by-Cycle Current Limit

Reduced EMI Generation

Low Thermal Resistance SO-8 Package

Uses Small Low Value Inductors

The LT

1578 is a 200kHz monolithic buck mode switching

regulator. A 1.5A switch is included on the die along with

all the necessary oscillator, control and logic circuitry. The

topology is current mode for fast transient response and

good loop stability. The LT1578 is a modified version of the

LT1507 that has been optimized for noise sensitive appli-

cations. It will operate over a 4V to 15V input range.

In addition, the reference voltage has been lowered to al-

low the device to produce output voltages down to 1.2V.

Quiescent current has been reduced by a factor of two.

Switch on resistance has been reduced by 30%. Switch tran-

sition times have been slowed to reduce EMI generation.

The oscillator frequency has been reduced to 200kHz to

maintain high efficiency over a wide output current range.

The pinout has been changed to improve PC layout by al-

lowing the high current, high frequency switching circuitry

to be easily isolated from low current, noise sensitive con-

trol circuitry. The new SO-8 package includes a fused

ground lead that significantly reduces the thermal resistance

of the device to extend the ambient operating temperature

range. Standard surface mount external parts can be used

including the inductor and capacitors.

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATIO S

Portable Computers

Battery-Powered Systems

Battery Chargers

Distributed Power Systems

TYPICAL APPLICATION

Efficiency vs Load Current

3.3V Buck Converter

INPUT

5V TO 15V

C3*

10µF TO

50µF

BOOST

0.33µF

EFFICIENCY (%)

L1**

15µH

1N914

OUTPUT**

3.3V, 1.25A

0.25

0.50 0.75 1.00

LOAD CURRENT (A)

1.25

1.50

OUT

= 3.3V

= 5V

L = 25µH

LT1578

OPEN = ON

SHDN

GND

100pF

1N5818

8.66k

4.99k

* RIPPLE CURRENT RATING

≥

OUT

** INCREASE L1 TO 30µH FOR LOAD

CURRENTS ABOVE 0.6A AND TO

60µH ABOVE 1A

SEE APPLICATIONS INFORMATION

100µF, 10V

SOLID

TANTALUM

1578 TA01

1578 TA02

LT1578IS8 Related Products

	LT1578IS8	LT1578IS8-2.5	LT1578CS8-2.5
Description	Conv DC-DC 4V to 15V Synchronous Step Down Single-Out 1.21V 8-Pin SOIC N	Conv DC-DC 4V to 15V Synchronous Step Down Single-Out 2.5V 8-Pin SOIC N	Conv DC-DC 4V to 15V Synchronous Step Down Single-Out 2.5V 8-Pin SOIC N

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