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273Z

1.2A Low Quiescent Current 1.5MHz High Efficiency Synchronous Buck Regulator

Intersil 

Block Diagram

ISL6273

Shutdown

Soft

Start

25pF

400k

EN

Bandgap 0.8V

EAMP

0.8pF

+

COMP

Oscillator

+

FB

Note 1

MODE

Shutdown

PW M/PFM

LOGIC

CONTROLLER

PROTECTION

DRIVER

VCC

5ΩΩ

POR

RSI

0.864V

+

+

0.736V

Slope

Comp

200ms

Delay

+

OCP

+

CSA1

1V

+

SKIP

0.2V

Zero -Cross

Sensing

PVIN

PHASE

PGND

SGND

0.2V

SCP

+

Note 1:

For adjustable output version, the internal feedback resistor divider is disabled and the FB pin is directly connected

to the error amplifier.

FIGURE 17. FUNCTIONAL BLOCK DIAGRAM

8

FN9256.0

March 7, 2006

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