AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 5 - 2

1 of 16

www.diodes.com

December 2012

© Diodes Incorporated

AP2552/ AP2553/ AP2552A/ AP2553A

PRECISION ADJUSTABLE CURRENT-LIMITED POWER SWITCHES

Description

The AP2552/53and AP2552A/53A are single channel precision

adjustable current-limited switches optimized for the applications

require precision current limiting or to provide up to 2.1A of

continuous load current during heavy loads/short circuits. These

devices offer a programmable current-limit threshold between 75mA

and 2.35A (typ) via an external resistor. Current limit accuracy ±6%

can be achieved at high current-limit settings. The rise and fall times

are controlled to minimize current surges during turn on/off.

The devices have fast short-circuit response timefor improved overall

system robustness. They provide a complete protection solution for

applications subject to heavy capacitive loads and the prospect of

short circuit, offering reverse current blocking and limiting, over-

current, over-temperature and short-circuit protection, as well as

controlled rise time and under-voltage lockout functionality. A

7ms deglitch capability on the open-drain Flag output prevents false

over-current reporting and does not require any external components.

AP2552/53 limits the output current to a safe level when the output

current exceeds current-limit threshold.

AP2552A/53A provides latch-off function during over-current or

reverse-voltage conditions.

All devices are available in SOT26 and U-DFN2020C-6 packages.

Applications

•

Set-Top-Boxes

•

LCD TVs & Monitors

•

Residential Gateways

•

Laptops, Desktops, Servers, e-Readers, Printers, Docking

Stations, HUBs

Pin Assignments

PAD

1

2

3

6

5

4

IN

GND

EN

OUT

FAULT

ILIM

U-DFN2020C-6

(Top View)

IN

GND

EN

OUT

FAULT

ILIM

6

5

4

1

2

3

(Top View)

SOT26

Features

•

Up to 2.1A maximum load current

•

Accurate adjustable current limit, 75mA - 2350mA

•

•

Constant-current (AP2552/53) during over-current

•

Output latch-off (AP2552A/53A) at over-current

•

Fast short-circuit response time: 2µs (typ)

•

Reverse current blocking during shutdown and reverse current

limiting during enable

•

Operating range: 2.7V – 5.5V

•

Built-in soft-start with 3ms typical rise time

•

Over-current , output over-voltage and thermal protection

•

Fault report (FAULT) with blanking time

•

ESD protection: 2kV HBM, 500V CDM

•

Active low (AP2552/52A) or active high (AP2553/53A) enable

•

Ambient temperature range: -40ºC to +85°C

•

SOT26 and DFN2020-6 package: Available in “Green”Molding

Compound (No Br, Sb)

•

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

•

Halogen and Antimony Free. “Green” Device (Note 3)

•

15kV ESD Protection per IEC 61000-4-2 (with external

capacitance)

•

UL Recognized, File Number (to be completed)

•

IEC60950-1 CB Scheme Certified (to be completed)

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.