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Ap1635, Block diagram, Absolute maximum ratings – Diodes AP1635 User Manual

Page 3: Pwm/pfm dual mode step-down dc/dc converter

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AP1635

PWM/PFM DUAL MODE STEP-DOWN DC/DC

CONVERTER

AP1635 Rev. 4

3 of 8

FEBRUARY 2009

www.diodes.com

©

Diodes Incorporated

Block Diagram


Phase

Compensation

Vref with

CE

+

-

PWM/PFM

Controller

+

-

Ramp Wave

Generator,

OSC

SW

CE/SS

GND

PVcc

PWM

Comparator

FB

Current Limit

Soft

Start

ERR

AMP

SVcc


Absolute Maximum Ratings

(T

A

=25°C)

Symbol

Parameter

Ratings

Units

V

CC

/SV

CC

V

IN

Pin Voltage

-0.3 ~ 5.0

V

V

SW

SW Pin Voltage

-0.3 ~ V

IN

+0.3 V

V

FB

FB Pin Voltage

-0.3 ~ V

IN

+0.3 V

V

CE/SS

CE/SS Pin Voltage

-0.3 ~ V

IN

+0.3 V

P

D

Continuous Total Power Dissipation

Internal limited

T

OPR

Operating Ambient Temperature

-25 ~ +80

°C

T

STG

Storage Temperature

-40 ~ +125

°C