LTC3407A-2 Linear Technology, LTC3407A-2 Datasheet

LTC3407A-2

Manufacturer Part Number

LTC3407A-2

Description

Dual Synchronous 800mA2.25MHz Step-Down DC/DC Regulator

Manufacturer

Linear Technology

Datasheet

1.LTC3407A-2.pdf (16 pages)

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FEATURES

■

APPLICATIO S

■

TYPICAL APPLICATIO

High Efficiency: Up to 95%

Low Ripple (<35mV

2.25MHz Constant Frequency Operation

No Schottky Diodes Required

Low R

Current Mode Operation for Excellent Line

and Load Transient Response

Short-Circuit Protected

Low Dropout Operation: 100% Duty Cycle

Ultralow Shutdown Current: I

Output Voltages from 5V down to 0.6V

Power-On Reset Output

Externally Synchronizable Oscillator

Optional External Soft-Start

Small Thermally Enhanced MSOP and 3mm × 3mm

DFN Packages

PDAs/Palmtop PCs

Digital Cameras

Cellular Phones

Wireless and DSL Modems

OUT2

AT 800mA

= 40μA

= 2.5V

10μF

DS(ON)

TO 5.5V

= 2.5V

1mm High 2.5V/1.8V at 800mA Step-Down Regulators

Internal Switches: 0.35Ω

22pF

887k

280k

10μF

2.2μH

PK-PK

) Burst Mode Operation;

RUN/SS2

MODE/SYNC

SW2

FB2

<1μA

LTC3407A-2

GND

RUN/SS1

SW1

POR

FB1

2.2μH

100k

442k

RESET

22pF

887k

DESCRIPTIO

The LTC

nous step-down DC/DC converter. Intended for low power

applications, it operates from a 2.5V to 5.5V input voltage

range and has a constant 2.25MHz switching frequency,

enabling the use of tiny, low cost capacitors and inductors

1mm or less in height. Each output voltage is adjustable

from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power

switches provide high efficiency without the need for

external Schottky diodes.

A user selectable mode input is provided to allow the user

to trade-off ripple noise for low power efficiency. Burst

Mode

loads, while Pulse Skip Mode provides the lowest ripple

noise at light loads.

To further maximize battery life, the P-channel MOSFETs

are turned on continuously in dropout (100% duty cycle),

and both channels draw a total quiescent current of only

40μA. In shutdown, the device draws <1μA.

Corporation. All other trademarks are the property of their respective owners. Protected by

U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.

Dual Synchronous 800mA,

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

10μF

AT 800mA

OUT1

3407A2 TA01

operation provides the highest efficiency at light

= 1.8V

3407A-2 is a dual, constant frequency, synchro-

2.25MHz Step-Down

DC/DC Regulator

100

Efficiency/Power Loss Curve

LOAD CURRENT (mA)

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

LTC3407A-2

2.5V

www.DataSheet4U.com

= 3.3V

100

1.8V

3407A2 TA02

1000

0.1

0.01

0.001

0.0001

3407a2f

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