LTC1874 Linear Technology, LTC1874 Datasheet

LTC1874

Manufacturer Part Number

LTC1874

Description

Dual Constant Frequency Current Mode Step-Down DC/DC Controller

Manufacturer

Linear Technology

Datasheet

1.LTC1874.pdf (12 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC1874EGN

Manufacturer:

Quantity:

10 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC1874EGN#TR

Manufacturer:

PHI

Quantity:

480

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FEATURES

TYPICAL

APPLICATIO S

High Efficiency: Up to 94%

High Output Currents Easily Achieved

Wide V

Constant Frequency 550kHz Operation

Burst Mode

Low Dropout: 100% Duty Cycle

0.8V Reference Allows Low Output Voltages

Current Mode Operation for Excellent

Line and Load Transient Response

Low Quiescent Current: 270 A (Each Controller)

Separate Shutdown Pin for Each Controller

Shutdown Mode Draws Only

8 A Supply Current (Each Controller)

Available in 16-Lead Narrow SSOP

Each Controller Functions Independent of the Other

1- or 2-Cell Lithium-Ion-Powered Applications

Personal Information Appliances

Portable Computers

Distributed 3.3V, 2.5V or 1.8V Power Systems

2.5% Reference Accuracy

C1, C2: SANYO POSCAP 6TPA47M

D1, D2: MBRM120

L1, L2: COILCRAFT D01608C-472

M1, M2: Si3443DV

R1, R2: DALE 0.25W

: TAIYO YUDEN CERAMIC

EMK325BJ106MNT ( 2)

Range: 2.5V to 9.8V

APPLICATION

Operation at Light Load

TO 9.5V

3.5V

Figure 1. LTC1874 3.5V-9.5V Input to 3.3V/1A and 1.8V/1A Dual Step-Down Converter

OUT1

3.3V

80.6k

249k

10 F

16V

47 F

4.7 H

0.04

220pF

10k

DESCRIPTIO

Burst Mode is a trademark of Linear Technology Corporation.

The LTC

step-down DC/DC controller with excellent AC and DC load

and line regulation. Each controller has an accurate

undervoltage lockout that shuts down the individual con-

troller when the input voltage falls below 2.0V.

The LTC1874 boasts 2.5% output voltage accuracy and

consumes only 270 A of quiescent current per controller.

The LTC1874 is configured with Burst Mode operation,

which enhances efficiency at low output current for appli-

cations where efficiency is a prime consideration.

To further maximize the life of a battery source, each

external P-channel MOSFET is turned on continuously in

dropout (100% duty cycle). In shutdown, each controller

draws a mere 8 A. High constant operating frequency of

550kHz allows the use of small external inductors.

The LTC1874 is available in a small footprint 16-lead

narrow SSOP.

SENSE1

GND1

PGND1

PGATE1

IN1

FB1

Current Mode Step-Down

Dual Constant Frequency

IN1

/RUN1

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

LTC1874

–

SENSE2

PGATE2

PGND2

/RUN2

GND2

1874 is a dual constant frequency current mode

FB2

IN2

–

220pF

DC/DC Controller

10k

0.04

4.7 H

LTC1874

47 F

100k

80.6k

1874 TA01

1.8V

OUT2

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