LTC3416

1

3416f

s

High Efficiency: Up to 95%

s

4A Output Current

s

s

Tracking Input to Provide Easy Supply Sequencing

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Programmable Frequency: 300kHz to 4MHz

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2.25V to 5.5V Input Voltage Range

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±2% Output Voltage Accuracy

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0.8V Reference Allows Low Output Voltage

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Low Dropout Operation: 100% Duty Cycle

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Power Good Output Voltage Monitor

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Overtemperature Protected

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Available in a 20-Lead Thermally Enhanced

TSSOP Package

4A, 4MHz, Monolithic

Synchronous Step-Down

Regulator with Tracking

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Portable Instruments

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Notebook Computers

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Distributed Power Systems

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Battery-Powered Equipment

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POL Board Power

SVIN

PGOOD

22

µF

2.5V

100

µF

×2

1.8V

4A

0.2

µH

SW

LTC3416

PGND

SGND

RUN/SS

TRACK

PVIN

127k

7.5k

200k

255k

200k

255k

3416 F01a

820pF

2.5V TO 5.5V

I/O VOLTAGE

Figure 1a. 2.5V/4A Step-Down Regulator with Tracking

The LTC

nous, step-down DC/DC converter utilizing a constant

frequency, current mode architecture. It operates from an

input voltage range of 2.25V to 5.5V and provides a

regulated output voltage from 0.8V to 5V while delivering

up to 4A of output current. The internal synchronous

power switch with 67m

Ω of on-resistance increases effi-

ciency and eliminates the need for an external Schottky

diode. Switching frequency is set by an external resistor.

100% duty cycle provides low dropout operation extend-

ing battery life in portable systems. OPTI-LOOP

sation allows the transient response to be optimized over

a wide range of loads and output capacitors.

The LTC3416 operates in forced continuous operation and

provides tracking of another power supply rail. Forced

continuous operation reduces noise and RF interference and

provides excellent transient response. Fault protection is

provided by an overcurrent comparator, and adjustable

compensation allows the transient response to be optimized

over a wide range of loads and output capacitors.

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

OPTI-LOOP is a registered trademark of Linear Technology Corporation.

Figure 1b. Efficiency vs Load Current

LOAD CURRENT (A)

0.01

40

50

60

70

80

0.10

1

10

3416 G09

30

20

10

0

90

100

f = 2MHz

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO