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Ap1635, Electrical characteristics, Pwm/pfm dual mode step-down dc/dc converter – Diodes AP1635 User Manual

Page 4

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AP1635

PWM/PFM DUAL MODE STEP-DOWN DC/DC

CONVERTER

AP1635 Rev. 4

4 of 8

FEBRUARY 2009

www.diodes.com

©

Diodes Incorporated

Electrical Characteristics


V

IN

=5V, V

OUT

=2V, Load=300mA, T

A

=25°C

Symbol

Parameter

Conditions

Min

Typ.

Max

Units

V

FB

FB

0.975 1.0 1.025

V

V

IN

Input

Voltage

2.2 - 5 V

Line

Regulation V

IN

=2.2~5V, Load=10mA

-

-

0.12

%

Load

Regulation I

OUT

=10~1200mA -

-

1.2

%

V

UVLO

UVLO Voltage(min.
operating voltage)

V

CC

, voltage required to maintain H at V

OUT

- - 2 V

I

CC

Operating

Current

CE/SS=V

IN

, No Load

-

100

150

μA

I

CCQ

Supply

Current

No external components,
CE/SS=V

IN

, V

FB

=1.2V

- 90

120

μA

I

STB

Stand-by

Current

No external components,
CE/SS=0V, V

FB

=0V

- 6 -

μA

I

CL

Current

Limit

Peak current
V

IN

=5V, V

OUT

=2V

1200 1400 1600 mA

Fosc Oscillator

Frequency Load=300mA,

V

IN

=5V, V

OUT

=2V 500

700

-

kHz

MAXDTY Maximum Duty Ratio

85

90

-

%

PFMDTY PFM Duty Ratio

No load

15

25

35

%

V

CEH

CE/SS

”High”

Voltage

Apply 1.4V (min.) to CE/SS, determine
V

OUT

“High”

1.4

- - V

V

CEL

CE/SS ”Low” Voltage Same as V

CEH

, determine V

OUT

/“Low” -

-

0.6

V

EFFI Efficiency

V

CC

=5V, V

OUT

=3.3V,

Load=300mA

- 93 - %

Rdson Rdson

Condition

I

OUT

=300mA, V

IN

=5V, V

OUT

=2V -

350

450

m