Data sheet, Electrical characteristics, I- i v - v – Diodes AP3502E User Manual

Page 5

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Data Sheet

340kHz, 2A Synchronous DC-DC Buck Converter AP3502E

Dec. 2012 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

5

Electrical Characteristics

T

A

=25ºC, V

IN

=V

EN

=12V, V

OUT

=3.3V, unless otherwise specified.

Parameter Symbol

Conditions

Min

Typ

Max

Unit

SUPPLY VOLTAGE (IN PIN)

Input Voltage

V

IN

4.5

18

V

Quiescent Current

I

Q

V

FB

=1V, V

EN

=3V

1.2

1.4

mA

Shutdown Supply Current

I

SHDN

V

EN

=0V

0.1

10

μA

UNDER VOLTAGE LOCKOUT

Input UVLO Threshold

V

UVLO

V

IN

Rising

3.65

4.00

4.25

V

Input UVLO Hysteresis

V

HYS

200

mV

ENABLE (EN PIN)

EN Shutdown Threshold Voltage

1.1

1.5

2

V

EN

1

Shutdown

1

Threshold

1

Voltage

1

Hystere-

sis (Note 3)

350

mV

EN Lockout Threshold Voltage

2.2

2.5

2.7

V

EN Lockout Hysteresis

210

mV

VOLTAGE REFERENCE (FB PIN)

Feedback Voltage

V

FB

0.907

0.925

0.943

V

Feedback Over Voltage Threshold

V

FBOV

1.1

V

Feedback Bias Current

I

FB

V

FB

=1V -0.1

0.1

μA

MOSFET

High-side Switch On-resistance (Note 2)

R

DSONH

I

SW

=0.2A/0.7A

100

mΩ

Low-side Switch On-resistance (Note 2)

R

DSONL

I

SW

=-0.2A/-0.7A

100

mΩ

CURRENT LIMIT

High-side Switch Leakage Current

I

LEAKH

V

IN

=18V,V

EN

=V

SW

=0V

0.1 10

μA

High-side Switch Current Limit

I

LIMH

2.7

3.5

A

Low-side Switch Current Limit

I

LIML

Drain to Source

0

mA

SWITCHING REGULATOR

Oscillator Frequency

f

OSC1

280

340

400

kHz

Short Circuit Oscillator Frequency

f

OSC2

90

kHz

Max. Duty Cycle

D

MAX

V

FB

=0.85V

90

%

Min. Duty Cycle

D

MIN

V

FB

=1V

0

%

ERROR AMPLIFIER

Error Amplifier Voltage Gain (Note 3)

A

EA

400

V/V

Error Amplifier Transconductance

G

EA

800

μA/V

COMP to Current Sense Transconductance

G

CS

3.5

A/V

THERMAL SHUTDOWN

Thermal Shutdown (Note 3)

T

OTSD

160

ºC

Thermal Shutdown Hysteresis (Note 3)

T

HYS

30

ºC

SOFT START (SS PIN)

Soft-start Time (Note 3)

t

SS

C5=0.1

μF

15 ms

Soft-start Current

5

μA

Note 2: R

DSON

=

SW2

SW1

SW2

SW1

I

-

I

V

-

V

Note 3: Not tested, guaranteed by design.

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