Diodes AP2552, AP2553, AP2552A, AP2553A User Manual

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P2552/ AP2553/ AP2552A/ AP2553A

PRECISION ADJUSTABLE CURRENT-LIMITED POWER SWITCHES

Description

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

adjustable current-limited switches optimized for applications that

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 2.36A (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 time for 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-DFN2020-6 packages.

Applications

 Set-Top-Boxes

 LCD TVs & Monitors

 Residential Gateways

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

Stations, HUBs

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/quality/lead_free.html 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.

Pin Assignments

Top View

OUT

ILIM

FAULT

1

PAD

2

3

U-DFN2020-6

GND

EN

Top View

1

2

3

SOT26

6

IN

5

GND

EN

4

6

5

4

OUTIN

ILIM

FAU LT

Features

 Up to 2.1A Maximum Load Current

 Accurate Adjustable Current Limit, 75mA - 2360mA

 ±6% Accurate Adjustable Current Limit, 1.63A with R

 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 U-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 E322375, Vol. 1

 1IEC60950-1 CB Scheme Certified

LIM

= 15k

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 8 - 2

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P2552/ AP2553/ AP2552A/ AP2553A

Typical Applications Circuit

Available Options

Part Number Channel Enable Pin (EN)

AP2552 1 Active Low

AP2553 1 Active High

AP2552A 1 Active Low

AP2553A 1 Active High

120µF Output Capacitance is a Requirement of USB

Recommended Maximum

Continuous Load Current (A)

2.1 Constant-Current

2.1 Latch-Off

Current-Limit

Protection

Package

U-DFN2020-6

SOT26

U-DFN2020-6

SOT26

Pin Descriptions

Pin

Name

GND 2 2 5 5 — Ground, connect to external exposed pad.

FAULT

ILIM 5 5 2 2 O

OUT 6 6 1 1 O Output

Exposed

Pad

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 8 - 2

AP2552W6-7 AP2553W6-7 AP2552FDC-7 AP2553FDC-7

IN 1 1 6 6 I

EN

EN — 3 — 4 I Enable input, logic high turns on power switch.

— — Pad Pad —

Pin Number

3 — 4 — I Enable input, logic low turns on power switch.

4 4 3 3 O

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I/O Function

Input, connect a 0.1µF or greater ceramic capacitor from
IN to GND as close to IC as possible.

Active-low open-drain output, asserted during over­current, over-temperature, or reverse-voltage conditions.

Use external resistor to set current-limit threshold;
recommended 10k≦RLIM≦232k.

No internal connection; recommend to connect to GND
externally for improved power dissipation. . It should not
be used as electrical ground conduction path.

February 2014

© Diodes Incorporated

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Functional Block Diagram

P2552/ AP2553/ AP2552A/ AP2553A

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 8 - 2

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P2552/ AP2553/ AP2552A/ AP2553A

Absolute Maximum Ratings (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Ratings Unit

ESD

VIN, V

VILIM,

HBM Human Body Model ESD Protection 2 kV

CDM Charged Device Model ESD Protection 500 V

IEC system

level

, V

OUT

FAULT

VENV

,EN

—

Surges per EN61000-4-2. 1999 applied to output

terminals of EVM Note (5)

,

Voltage on IN, OUT,

Continuous

FAULT

sink current

FAULT

, ILIM, EN, EN

15 kV

-0.3 to +6.5 V

25 mA

— ILIM source current 1 mA

I

LOAD

T

J(MAX)

TST

Notes: 4. UL Recognized Rating from -30°C to +70°C (Diodes qualified TST from -65°C to +150°C)

5. External capacitors need to be connected to the output, EVM board was tested with capacitor 2.2uF 50V 0805. This level is a pass test only and not a
limit.

Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices.

Maximum Continuous Load Current Internal Limited A

Maximum Junction Temperature -40 to +150 °C

Storage Temperature Range (Note 4) -65 to +150 °C

Dissipation Rating Table

Thermal

Board Package

Resistance

Thermal

Resistance

θ

JA

θJC

T

≤ +25°C

A

Power

Rating

Derating Factor

Above

= +25°C

T

A

T

= +70°C

A

Power Rating

= +85°C

T

A

Power
Rating

High-K (Note 6) W6 160°C/W 55°C/W 625mW 6.25mW/°C 340mW 250mW

High-K (Note 6) FDC 120°C/W 34°C/W 833mW 8.33mW/°C 450mW 330mW

Note: 6. The JEDEC high-K (2s2p) board used to derive this data was a 3in x 3in, multilayer board with 1-ounce internal power and ground planes with
2-ounce copper traces on top and bottom of the board.

Recommended Operating Conditions (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Min Max Unit

V

IN

I

OUT

VENV

,EN

VIH

VIL

R

LIM

IO



TA

TJ

Input Voltage 2.7 5.5 V

Continuous Output Current (-40°C  TA  +85°C)

Enable Voltage 0 5.5 V

High-Level Input Voltage on EN or

Low-Level Input Voltage on EN or

EN

EN

Current-Limit Threshold Resistor Range
(1% initial tolerance)

Continuous

FAULT

Sink Current

Input De-Coupling Capacitance, IN to GND 0.1

0 2.1 A

2.0

V

IN

0 0.8 V

10 210 k

0 10 mA



Operating Ambient Temperature -40 +85

Operating Junction Temperature -40 +125

V

µF

C

C

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 8 - 2

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P2552/ AP2553/ AP2552A/ AP2553A

Electrical Characteristics (@T

= +25°C, VIN = 2.7V to 5.5V, VEN = 0V or VEN = VIN, R

A

= 10k, unless otherwise specified.)

FAULT

Symbol Parameter Test Conditions (Note 7) Min Typ Max Unit

Supply

V

V

I

UVLO

UVLO

SHDN

I

Q

I

REV

Input UVLO

Input UVLO Hysteresis

Input Shutdown Current

Input Quiescent Current

Reverse Leakage Current

VIN rising 

VIN decreasing 

= 5.5V, disabled, OUT = open

V

IN

= 5.5V, enabled, OUT = open, R

V

IN

V

= 5.5V, enabled, OUT = open, R

IN

Disabled, V

= 0V, V

IN

OUT

= 5.5V, I

= 20k

LIM

= 210k 

LIM

at VIN

REV

2.4 2.65 V

25

0.1 1 µA



100 140 µA





80 120 µA

0.01 1 µA



Power Switch

70 95

135

80 105



150

1.1 1.5 ms

0.7 1 ms



0.5 ms



0.5 ms



R

DS(ON)

Switch On-Resistance

Output Turn-On Rise Time

tR

Output Turn-Off Fall Time

tF

SOT26 package,

U-DFN2020-6 package

V

= 5.5V, CL = 1µF, R

IN

VIN = 2.7V, CL = 1µF, R

V

= 5.5V, CL = 1µF, R

IN

VIN = 2.7V, CL = 1µF, R

T

= +25°C, V

J

= 5.0V 

IN

-40°C  TA  +85°C  

= +25°C, V

T

J

= 5.0V

IN

-40°C  TA  +85°C  

= 100. See Figure 1 

LOAD

= 100.

LOAD

= 100. See Figure 1

LOAD

= 100.

LOAD

0.1

0.1

Current Limit

2200 2365 2542

1540 1632 1730

1180 1251 1326

1160 1251 1340

500 530 562

485 529 573

121 142 162

50 75 100

2620

1820



1380



570

150



75





2















mA

I

LIMIT

I

SHORT

t

SHORT

Current-Limit Threshold
(maximum DC output current),

= V

V

OUT

IN

-0.5V

Short-Circuit Current Limit, OUT
Connected to GND

Short-Circuit Response Time

R

= 10k -40°C  TA  +85°C

LIM

R

= 15k -40°C  TA  +85°C

LIM

T

= +25°C

R

= 20k

LIM

R

= 49.9k

LIM

R

= 210k

LIM

I

shorted to IN or GND

LIM

= 10k 

R

LIM

R

= 15k

LIM

R

= 20k

LIM

R

= 49.9k 

LIM

R

= 210k

LIM

I

shorted to IN or GND

LIM

V

= 0V to I

OUT

OUT

= I

(OUT shorted to ground)

LIMIT

J

-40°C  TA  +85°C

T

= +25°C

J

-40°C  TA  +85°C

See Figure 2

Enable Pin

I

LEAK-EN

tON

t

OFF

EN Input Leakage Current

Turn-On Time

Turn-Off Time

V

IN

= 5V, V

= 0V and 6V

EN

-0.5

CL = 1µF, RL = 100. See Figure 1  

CL = 1µF, RL = 100. See Figure 1  

0.5 µA



3 ms

1 ms

Output Discharge

R

R

DIS_LATCH

Notes: 7. Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately.

8. The discharge function is active when the device is disabled (when enable is de-asserted or during power-up power-down when V
The discharge function offers a resistive discharge path for the external storage capacitor for limited time.

Discharge Resistance (Note 8)

DIS

Discharge Resistance During
Latch-Off

VIN = 5V, disabled, I

= 5V, latch-off, AP2552A/53A only 

V

IN

OUT

=1mA

600



1000





< V

).

IN

UVLO

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 8 - 2

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February 2014

© Diodes Incorporated

mV

m

mA

µs



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