Diodes AT5503 Manuel d'utilisateur télécharger pdf (Page 5)

Preliminary Datasheet

18V, 3A Synchronous DC-DC Buck Converter AT5503

Mar. 2013 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

Electrical Characteristics

=12V, V

OUT

=3.3V, T

=25ºC, 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,

=3.3V

1.2 1.4 mA

Shutdown Supply Current I

SHDN

=0V 0.1 1.0 µA

UNDER VOLTAGE LOCKOUT

Input UVLO Threshold V

UVLO

Rising 3.65 4.0 4.25 V

Input UVLO Hysteresis V

HYS

0.2 V

ENABLE (EN PIN)

EN Shutdown Threshold

Voltage

1.1 1.5 2 V

EN Shutdown Threshold

Voltage Hysteresis (Note 2)

350

EN Lockout Threshold Voltage

2.2 2.5 2.7 V

EN Lockout Hysteresis

210

VOLTAGE REFERENCE (FB PIN)

Feedback Voltage V

0.784 0.8 0.816 V

Feedback Over Voltage

Threshold

FBOV

1.1 V

Feedback Bias Current I

=1V -0.1 0.1 µA

MOSFET

High-side Switch On-resistance

(Note 3)

DSONH

=0.2A&0.7A 100 mΩ

Low-side Switch On-resistance

(Note 3)

DSONL

=-0.2A&-0.7A 100 mΩ

CURRENT LIMIT

High-side Switch Leakage

Current

LEAKH

=18V,

=0V, 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

50 mA

SWITCHING REGULATOR

Oscillator Frequency f

OSC1

410 500 590 kHz

Short Circuit Oscillator

Frequency

OSC2

180 kHz

1 2 3 4 5 6 7 8 9 10 11 12

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Diodes AT5503 Manuel d'utilisateur Page 5

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