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Preliminary datasheet, Electrical characteristics (continued), Parameters symbol conditions min typ max unit – Diodes AP3408 User Manual

Page 6

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Preliminary Datasheet

2A, 4MHz High Efficiency Synchronous Buck Converter AP3408

Jan. 2013 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

6

Electrical Characteristics (Continued)

V

IN

=V

DD

=V

PVDD

=3.3V, T

A

=25℃, unless otherwise specified.

Parameters

Symbol

Conditions

Min

Typ

Max

Unit

OSCILLATOR SECTION

RT Pin Voltage

V

RT

0.8

V

Switching Frequency

f

OSC

R

OSC

=330k

0.8 1 1.2

MHz

ADJ Frequency

0.3

4

MHz

Maximum Duty Cycle

D

MAX

V

FB

=0.75V 100

%

POWER SWITCH SECTION

Switch Current Limit

I

LIMIT

V

FB

=0.75V 2.2

3.8 A

Internal P-FET On
Resistance

R

PDSON

I

SW

=500mA

0.11

0.16

Internal N-FET On
Resistance

R

NDSON

I

SW

=-500mA

0.11

0.17

SHDN/RT SECTION

Shutdown Threshold

V

DD

-0.7 V

DD

-0.4

V

PGOOD SECTION

PGOOD Voltage Range

±12.5

±15 %

PGOOD Pull Down
Resistance

120

TOTAL DEVICE

Output Current

I

OUT

V

DD

=2.6 to 5.5V

V

OUT

=2.5V

2 A

Output Voltage Line
Regulation

LNR

V

DD

=2.7 to 5.5V

I

OUT

=100mA

0.4 %/V

Output Voltage Load
Regulation

LOD I

OUT

=0.01 to 2A

±0.2 %

Soft-start Time

t

SS

I

OUT

=10mA

1.5 ms

Thermal Shutdown
Temperature

T

OTSD

160

ºC

Thermal Shutdown
Temperature Hysteresis

T

HYS

20

ºC