SS6550COTB datasheet(8/13 Pages) SSC

No. de pieza	SS6550COTB

Descripción Electrónicos	Low-Noise Synchronous PWM Step-Down DC/DC Converter

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Fabricante Electrónico	SSC [Silicon Standard Corp.]

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SS6550

n BLOCK DIAGRAM

10

Q3

5

VIN

REF

FB

REF

GND

LX

SHDN

BP

C hip Supply

C ontrol Logic

Selection

Frequency

SYNC

RT

O scillator

500KHz

+

-

C ompensation

S lope

C urrent Limit

C omparator

C urrent AMP .

+

-

X 5

0.75V

REF

Zero C ross

C omparator

A nti-

Shoot-

Through

+

-

+

-

VIN

Control

PWM/PFM

PFM

+

-

C omparator

PWM

AMP .

Error

+

-

P hase

Compensation

FB

Q1

x1

Q1

X20

n PIN DESCRIPTIONS

PIN 1: VIN-

Supply voltage input. Input range

from +2.5V to +5.5V. Bypass with a

10µF capacitor.

PIN 2: BP-

Supply bypass pin, internally con-

nected to VIN. Bypass with a 0.1µF

capacitor. Do not connect to an ex-

ternal power source other than VIN.

PIN 3: SHDN - Active-low, shutdown-control input.

Reduces supply current to 0.1µA in

shutdown.

PIN 4: FB-

Feedback input.

PIN 5: RT-

Frequency adjustable pin. Connect a

resistor from this pin to GND to de-

crease the frequency.

PIN 6: SYNC/MODE- Oscillator sync and low-noise,

mode-control Input.

SYNC/MODE = VIN (Forced PWM

mode)

SYNC/MODE = GND (PWM/PFM

mode)

An external clock signal connected

to this pin allows for LX switching

synchronization.

PIN 7: GND-

Ground.

PIN 8: LX-

Inductor connection to the drains of

the internal power MOSFETs

Rev.2.01 6/06/2003

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SS6550COTB Datasheet(PDF) 8 Page - Silicon Standard Corp.

SS6550COTB Datasheet(HTML) 8 Page - Silicon Standard Corp.

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