Diodes AP3503 Manuel d'utilisateur télécharger pdf (Page 5)

Data Sheet

340kHz, 3A Synchronous DC-DC Buck Converter AP3503

May. 2012 Rev. 1. 7 BCD Semiconductor Manufacturing Limited

Electrical Characteristics

=25ºC, V

=12V, V

OUT

=3.3V, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Unit

SUPPLY VOLTAGE (IN PIN)

Input Voltage V

4.5 18 V

Quiescent Current I

=1V,V

=3V 1.2 1.4 mA

Shutdown Supply Current I

SHDN

=0V 0.1 10

µA

UNDER VOLTAGE LOCKOUT

Input UVLO Threshold V

UVLO

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 Shutdown Threshold Voltage Hysteresis

(Note 2)

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

0.907 0.925 0.943 V

Feedback Over Voltage Threshold V

FBOV

1.1 V

Feedback Bias Current I

=1V -0.1 0.1

µA

MOSFET

High-side Switch On-resistance(Note 3) R

DSONH

=0.2A/0.7A

100

mΩ

Low-side Switch On-resistance(Note 3) R

DSONL

=-0.2A/-0.7A

100

mΩ

CURRENT LIMIT

High-side Switch Leakage Current I

LEAKH

=18V,V

=0V 0.1 10

µA

High-side Switch Current Limit I

LIMH

4.3 5.6 A

Low-side Switch Current Limit I

LIML

From drain to Source 1.4 A

SWITCHING REGULATOR

Oscillator Frequency f

OSC1

280 340 400 kHz

Short Circuit Oscillator Frequency f

OSC2

90 kHz

Max. Duty Cycle D

MAX

=0.85V 90 %

Min. Duty Cycle D

MIN

=1V 0 %

ERROR AMPLIFIER

Error Amplifier Voltage Gain (Note 2) A

400 V/V

Error Amplifier Transconductance G

800

A/V

COMP to Current Sense Transconductance G

5.2 A/V

THERMAL SHUTDOWN

Thermal Shutdown (Note 2) T

OTSD

160 ºC

Thermal Shutdown Hysteresis (Note 2) T

HYS

20 ºC

SOFT START (SS PIN)

Soft-start Time (Note 2) t

=0.1µF

15 ms

Soft-start Current V

=0V 6

µA

Note 2: Not tested, guaranteed by design.

Note 3: R

DSON

SW2SW1

I-I

V-V

1 2 3 4 5 6 7 8 9 10 11

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Diodes AP3503 Manuel d'utilisateur Page 5

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