LTC1649CSPBF Linear Technology Corporation, LTC1649CSPBF Datasheet

LTC1649CSPBF

Manufacturer Part Number

LTC1649CSPBF

Description

SOP-16

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1649CSPBF.pdf (16 pages)

2.LTC1649CSPBF.pdf (16 pages)

Specifications of LTC1649CSPBF

Date_code

07+

Current page: 1 of 16
Download datasheet (219Kb)

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

SHDN

IRF7801 = INTERNATIONAL RECTIFIER

MBR0530 = MOTOROLA

*12TS-1R2HL = PANASONIC

3.3V

10 F

High Power 3.3V to 1.xV-2.xV Switching Regulator

Controller: Up to 20A Output

All N-Channel External MOSFETs

Provides 5V MOSFET Gate Drive with 3.3V Input

Excellent Output Regulation: 1% Over Line, Load

and Temperature Variations

Constant Frequency Operation Minimizes

Inductor Size

High Efficiency: Over 90% Possible

No Low-Value Sense Resistor Needed

Available in 16-Lead SO Package

3.3V Input Power Supply for Low Voltage

Microprocessors and Logic

Low Input Voltage Power Supplies

High Power, Low Voltage Regulators

Local Regulation for Multiple Voltage Distributed

Power Systems

220pF

MBR0530

7.5k

0.01 F

50k

0.1 F

IMAX

3.3V to 2.5V, 15A Converter

SHDN

COMP

GND

MAX

VCC1

VCC2

LTC1649

MBR0530

OUT

–

1 F

10 F

1 F

0.33 F

Q1, Q2

IRF7801

TWO IN

PARALLEL

IRF7801

DESCRIPTIO

The LTC

regulator controller optimized for use with very low supply

voltages. It operates from 2.7V to 5V input, and provides

a regulated output voltage from 1.26V to 2.5V at up to 20A

load current. A typical 3.3V to 2.5V application features

efficiency above 90% from 1A to 10A load. The LTC1649

uses a pair of standard 5V logic-level N-channel external

MOSFETs, eliminating the need for expensive P-channel

or super-low-threshold devices.

The LTC1649 shares its internal switching architecture

with the LTC1430, and features the same 1% line, load

and temperature regulation characteristics. Current limit

is user-adjustable without requiring an external low-value

sense resistor. The LTC1649 uses a 200kHz switching

frequency and voltage mode control, minimizing external

component count and size. Shutdown mode drops the

quiescent current to below 10 A.

The LTC1649 is available in the 16-pin narrow SO package.

3300 F

1.2 H

EXT

12.4k

12.7k

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

1649 is a high power, high efficiency switching

3.3V Input High Power

1649 TA01

4400 F

OUT

Step-Down Switching

2.5V

@15A

OUT

Regulator Controller

100

0.1

LTC1649 Efficiency

LOAD CURRENT (A)

LTC1649

1649 TA02

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