LTC3526 datasheet(7/16 Pages) LINER

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LTC3526/LTC3526B

3526bfd

–

GATE DRIVERS

AND

ANTI-CROSS

CONDUCTION

LOGIC

CLK

IPK

COMP

SLOPE

COMP

IZERO

COMP

ERROR AMP

SLEEP COMP

IZERO

WAKE

EXPOSED

PAD

–

WELL

SWITCH

MODE

CONTROL

UVLO

VREF

SHDN

VBEST

START-UP

1MHz

OSC

TSD

THERMAL

SHUTDOWN

ANTI-RING

VSEL

VIN

VOUT

4.7µH

SHUTDOWN

CLAMP

CSS

VREF

VOUT

GND

3526 BD

COUT

4.7µF

VOUT

1.6V

TO 5.25V

CIN

2.2µF

VIN

0.85V

TO 5V

block Diagram

(Refer to Block Diagram)

operaTion

The LTC3526/LTC3526B are 1MHz synchronous boost

converters housed in a 6-lead 2mm

× 2mm DFN package.

With the ability to start up and operate from inputs less

than 1V, these devices feature fixed frequency, current

mode PWM control for exceptional line and load regula-

tion. The current mode architecture with adaptive slope

compensation provides excellent transient load response,

requiring minimal output filtering. Internal soft-start and

internal loop compensation simplifies the design process

while minimizing the number of external components.

With its low RDS(ON) and low gate charge internal N-chan-

nel MOSFET switch and P-channel MOSFET synchronous

rectifier, the LTC3526 achieves high efficiency over a wide

range of load currents. Automatic Burst Mode operation

maintains high efficiency at very light loads, reducing

the quiescent current to just 9µA. Operation can be best

understood by referring to the Block Diagram.

LOW VOLTAGE START-UP

The LTC3526/LTC3526B include an independent start-up

oscillator designed to start up at an input voltage of 0.85V

(typical).Soft-startandinrushcurrentlimitingareprovided

during start-up, as well as normal mode.

When either VIN or VOUT exceeds 1.4V typical, the IC

enters normal operating mode. When the output voltage

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