AP2552/ 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.
Pin Assignments
(Top View)
OUT
ILIM
FAULT
1
2
3
PAD
6
5
4
IN
GND
EN
U-DFN2020-6
Top View
IN
GND
EN
1
2
3
SOT26
6
5
4
OUT
ILIM
FAULT
Features
Up to 2.1A Maximum Load Current
Accurate Adjustable Current Limit, 75mA - 2360mA
±6% Accurate Adjustable Current Limit, 1.63A with R
LIM
= 15kΩ
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
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.
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
1 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Typical Applications Circuit
120µF Output Capacitance is a Requirement of USB
Available Options
Part Number
AP2552
AP2553
AP2552A
AP2553A
Channel
1
1
1
1
Enable Pin (EN)
Active Low
Active High
Active Low
Active High
Recommended Maximum
Continuous Load Current (A)
2.1
2.1
Current-Limit
Protection
Constant-Current
Latch-Off
Package
U-DFN2020-6
SOT26
U-DFN2020-6
SOT26
Pin Descriptions
Pin
Name
IN
GND
Pin Number
AP2552W6-7 AP2553W6-7
1
2
3
—
4
5
6
—
1
2
—
3
4
5
6
—
AP2552FDC-7
6
5
4
—
3
2
1
Pad
AP2553FDC-7
6
5
—
4
3
2
1
Pad
I/O
I
—
I
I
O
O
O
—
Function
Input, connect a 0.1µF or greater ceramic capacitor from
IN to GND as close to IC as possible.
Ground, connect to external exposed pad.
Enable input, logic low turns on power switch.
Enable input, logic high turns on power switch.
Active-low open-drain output, asserted during over-
current, over-temperature, or reverse-voltage conditions.
Use external resistor to set current-limit threshold;
recommended 10kΩ≦RLIM≦232kΩ.
Output
No internal connection; recommend to connect to GND
externally for improved power dissipation. It should not be
used as electrical ground conduction path.
EN
EN
FAULT
ILIM
OUT
Exposed
Pad
AP2552/AP2553/AP2552A/AP2553A
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Functional Block Diagram
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
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AP2552/ AP2553/ AP2552A/ AP2553A
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
HBM
CDM
ESD
IEC system
level
V
IN
, V
OUT
, V
FAULT
,
VILIM,
V
EN,
V
EN
—
—
I
LOAD
T
J(MAX)
T
ST
Notes:
Parameter
Human Body Model ESD Protection
Charged Device Model ESD Protection
Surges per EN61000-4-2. 1999 Applied to Output
Terminals of EVM Note (5)
Voltage on IN, OUT,
FAULT
, ILIM, EN,
EN
Continuous
FAULT
Sink Current
ILIM Source Current
Maximum Continuous Load Current
Maximum Junction Temperature
Storage Temperature Range (Note 4)
Ratings
2
500
15
-0.3 to +6.5
25
1
Internal Limited
-40 to +150
-65 to +150
Unit
kV
V
kV
V
mA
mA
A
°C
°C
4. UL Recognized Rating from -30°C to +70°C (Diodes qualified T
ST
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.
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.
Caution:
Dissipation Rating Table
Board
High-K (Note 6)
High-K (Note 6)
Note:
Package
W6
FDC
Thermal
Resistance
θ
JA
160°C/W
120°C/W
Thermal
Resistance
θ
JC
55°C/W
34°C/W
T
A
≤
+25°C
Power
Rating
625mW
833mW
Derating Factor
Above
T
A
= +25°C
6.25mW/°C
8.33mW/°C
T
A
= +70°C
Power Rating
340mW
450mW
T
A
= +85°C
Power
Rating
250mW
330mW
6. The JEDEC high-K (2s2p) board used to derive this data was a 3in x 3in, multilayer board with 1oz internal power and ground planes with
2oz copper traces on top and bottom of the board.
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
IN
I
OUT
Input Voltage
Continuous Output Current (-40°C
≤
T
A
≤
+85°C)
Enable Voltage
High-Level Input Voltage on EN or
EN
Low-Level Input Voltage on EN or
EN
Current-Limit Threshold Resistor Range
(1% initial tolerance)
Continuous
FAULT
Sink Current
Input De-Coupling Capacitance, IN to GND
Operating Ambient Temperature
Operating Junction Temperature
Parameter
Min
2.7
0
0
2.0
0
10
0
0.1
-40
-40
Max
5.5
2.1
5.5
V
IN
0.8
210
10
+85
+125
Unit
V
A
V
V
V
kΩ
mA
µF
C
C
V
EN,
V
EN
V
IH
V
IL
R
LIM
I
O
T
A
T
J
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
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AP2552/ AP2553/ AP2552A/ AP2553A
Electrical Characteristics
(@T
A
= +25°C, V
IN
= 2.7V to 5.5V, V
EN
= 0V or V
EN
= V
IN
, R
FAULT
= 10kΩ, unless otherwise specified.)
Symbol
Supply
V
UVLO
V
UVLO
I
SHDN
I
Q
I
REV
Input UVLO
Input UVLO Hysteresis
Input Shutdown Current
Input Quiescent Current
Reverse Leakage Current
Parameter
V
IN
Rising
V
IN
Decreasing
V
IN
= 5.5V, Disabled, OUT = Open
V
IN
= 5.5V, Enabled, OUT = Open, R
LIM
= 20kΩ
V
IN
= 5.5V, Enabled, OUT = Open, R
LIM
= 210kΩ
Disabled, V
IN
= 0V, V
OUT
= 5.5V, I
REV
at V
IN
T
J
= +25°C, V
IN
= 5.0V
-40°C
≤
T
A
≤
+85°C
T
J
= +25°C, V
IN
= 5.0V
-40°C
≤
T
A
≤
+85°C
Test Conditions (Note 7)
Min
0.1
0.1
2200
1540
1180
1160
500
485
121
50
Typ
2.4
25
0.1
100
80
0.01
70
80
1.1
0.7
2365
1632
1251
1251
530
529
142
75
2620
1820
1380
570
150
75
2
Max
2.65
1
140
120
1
95
135
105
150
1.5
1
0.5
0.5
2542
1730
1326
1340
562
573
162
100
µs
mA
mA
ms
ms
ms
ms
mΩ
Unit
V
mV
µA
µA
µA
µA
Power Switch
SOT26 Package,
R
DS(ON)
Switch On-Resistance
U-DFN2020-6 Package
t
R
t
F
Output Turn-On Rise Time
Output Turn-Off Fall Time
V
IN
= 5.5V, C
L
= 1µF, R
LOAD
= 100Ω. See Figure 1
V
IN
= 2.7V, C
L
= 1µF, R
LOAD
= 100Ω.
V
IN
= 5.5V, C
L
= 1µF, R
LOAD
= 100Ω. See Figure 1
V
IN
= 2.7V, C
L
= 1µF, R
LOAD
= 100Ω.
R
LIM
= 10kΩ
R
LIM
= 15kΩ
-40°C
≤
T
A
≤
+85°C
-40°C
≤
T
A
≤
+85°C
T
J
= +25°C
-40°C
≤
T
A
≤
+85°C
T
J
= +25°C
-40°C
≤
T
A
≤
+85°C
Current Limit
I
LIMIT
Current-Limit Threshold
(maximum DC output current),
V
OUT
= V
IN
-0.5V
R
LIM
= 20kΩ
R
LIM
= 49.9kΩ
R
LIM
= 210kΩ
I
LIM
Shorted to IN or GND
R
LIM
= 10kΩ
R
LIM
= 15kΩ
I
SHORT
Short-Circuit Current Limit, OUT
Connected to GND
R
LIM
= 20kΩ
R
LIM
= 49.9kΩ
R
LIM
= 210kΩ
I
LIM
Shorted to IN or GND
V
OUT
= 0V to I
OUT
= I
LIMIT
(OUT shorted to ground)
See Figure 2
V
IN
= 5V, V
EN
= 0V and 6V
C
L
= 1µF, R
L
= 100Ω. See Figure 1
C
L
= 1µF, R
L
= 100Ω. See Figure 1
V
IN
= 5V, Disabled, I
OUT
=1mA
V
IN
= 5V, Latch-Off, AP2552A/53A Only
t
SHORT
Enable Pin
I
LEAK-EN
t
ON
t
OFF
R
DIS
R
DIS_LATCH
Notes:
Short-Circuit Response Time
EN Input Leakage Current
Turn-On Time
Turn-Off Time
Discharge Resistance (Note 8)
Discharge Resistance During
Latch-Off
-0.5
600
1000
0.5
3
1
µA
ms
ms
Ω
Ω
Output Discharge
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
IN
< V
UVLO
).
The discharge function offers a resistive discharge path for the external storage capacitor for limited time.
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
5 of 17
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October 2014
© Diodes Incorporated
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