AP255x

AP2552/ AP2553/ AP2552A/ AP2553A
PRECISION ADJUSTABLE CURRENT-LIMITED POWER SWITCHES
Description
Pin Assignments
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
(Top View)
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.
OUT
1
ILIM
2
FAULT
3
The devices have fast short-circuit response time for improved overall
PAD
6
5
IN
GND
4
EN
U-DFN2020-6
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-
Top View
current, over-temperature and short-circuit protection, as well as
controlled rise time and under-voltage lockout functionality. A
IN
1
6
OUT
GND
2
5
ILIM
EN
3
4
FAULT
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
SOT26
reverse-voltage conditions.
All devices are available in SOT26 and U-DFN2020-6 packages.
Features
Applications

Up to 2.1A Maximum Load Current

Accurate Adjustable Current Limit, 75mA - 2360mA

Set-Top Boxes

LCD TVs & Monitors

Residential Gateways

Laptops, Desktops, Servers, e-Readers, Printers, Docking
Stations, HUBs

±6% Accurate Adjustable Current Limit, 1.63A with RLIM = 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)
Notes:

UL Recognized, File Number E322375, Vol. 1

1IEC60950-1 CB Scheme Certified
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
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AP2552/ AP2553/ AP2552A/ AP2553A
Typical Applications Circuit
120µF Output Capacitance is a Requirement of USB
Available Options
Part Number
Channel
Enable Pin (EN)
AP2552
AP2553
AP2552A
1
1
1
Active Low
Active High
Active Low
AP2553A
1
Active High
Recommended Maximum
Continuous Load Current (A)
Current-Limit
Protection
Package
2.1
Constant-Current
U-DFN2020-6
SOT26
2.1
Latch-Off
U-DFN2020-6
SOT26
Pin Descriptions
Pin
Name
IN
Pin Number
AP2552W6-7 AP2553W6-7
1
I/O
AP2552FDC-7
AP2553FDC-7
6
6
I
1
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.
GND
2
2
5
5
—
EN
3
—
4
—
I
Enable input, logic low turns on power switch.
EN
—
3
—
4
I
FAULT
4
4
3
3
O
ILIM
5
5
2
2
O
Enable input, logic high turns on power switch.
Active-low open-drain output, asserted during overcurrent, over-temperature, or reverse-voltage conditions.
Use external resistor to set current-limit threshold;
recommended 10kΩ≦RLIM≦232kΩ.
OUT
6
6
1
1
O
Exposed
Pad
—
—
Pad
Pad
—
AP2552/AP2553/AP2552A/AP2553A
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Output
No internal connection; recommend to connect to GND
externally for improved power dissipation. It should not be
used as electrical ground conduction path.
October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Functional Block Diagram
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
HBM
CDM
ESD
IEC system
level
VIN, VOUT, V FAULT ,
VILIM, VEN, V
EN
—
—
ILOAD
TJ(MAX)
TST
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
Ratings
2
500
Unit
kV
V
15
kV
-0.3 to +6.5
V
25
mA
1
mA
Internal Limited
A
Maximum Junction Temperature
-40 to +150
°C
Storage Temperature Range (Note 4)
-65 to +150
°C
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.
Dissipation Rating Table
Board
Package
Thermal
Resistance
θJA
Thermal
Resistance
θJC
TA ≤ +25°C
Power
Rating
Derating Factor
Above
TA = +25°C
TA = +70°C
Power Rating
TA = +85°C
Power
Rating
High-K (Note 6)
High-K (Note 6)
W6
FDC
160°C/W
120°C/W
55°C/W
34°C/W
625mW
833mW
6.25mW/°C
8.33mW/°C
340mW
450mW
250mW
330mW
Note:
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 (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Min
Max
Unit
2.7
5.5
V
Continuous Output Current (-40°C ≤ TA ≤ +85°C)
0
2.1
A
Enable Voltage
0
5.5
V
High-Level Input Voltage on EN or EN
2.0
VIN
V
Low-Level Input Voltage on EN or EN
0
0.8
V
Current-Limit Threshold Resistor Range
(1% initial tolerance)
10
210
kΩ
VIN
Input Voltage
IOUT
VEN, VEN
VIH
VIL
RLIM
IO
Continuous FAULT Sink Current
0
10
mA

Input De-Coupling Capacitance, IN to GND
0.1

µF
TA
Operating Ambient Temperature
-40
+85
C
TJ
Operating Junction Temperature
-40
+125
C
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Electrical Characteristics (@TA = +25°C, VIN = 2.7V to 5.5V, VEN = 0V or VEN = VIN, RFAULT = 10kΩ, unless otherwise specified.)
Symbol
Supply
Parameter
Test Conditions (Note 7)
Min
Typ
Max
Unit
Input UVLO
VIN Rising

2.4
2.65
V
VUVLO
Input UVLO Hysteresis
VIN Decreasing

25

mV
ISHDN
Input Shutdown Current
VIN = 5.5V, Disabled, OUT = Open

0.1
1
µA
IQ
Input Quiescent Current
VUVLO
Reverse Leakage Current
IREV
VIN = 5.5V, Enabled, OUT = Open, RLIM = 20kΩ

100
140
µA
VIN = 5.5V, Enabled, OUT = Open, RLIM = 210kΩ

80
120
µA
Disabled, VIN = 0V, VOUT = 5.5V, IREV at VIN

0.01
1
µA
TJ = +25°C, VIN = 5.0V

70
95
-40°C ≤ TA ≤ +85°C


135
TJ = +25°C, VIN = 5.0V

80
105
-40°C ≤ TA ≤ +85°C


150
VIN = 5.5V, CL = 1µF, RLOAD = 100Ω. See Figure 1

1.1
1.5
VIN = 2.7V, CL = 1µF, RLOAD = 100Ω.

0.7
1
ms
VIN = 5.5V, CL = 1µF, RLOAD = 100Ω. See Figure 1
0.1

0.5
ms
VIN = 2.7V, CL = 1µF, RLOAD = 100Ω.
0.1

0.5
ms
2542
Power Switch
SOT26 Package,
RDS(ON)
Switch On-Resistance
U-DFN2020-6 Package
Output Turn-On Rise Time
tR
Output Turn-Off Fall Time
tF
mΩ
ms
Current Limit
Current-Limit Threshold
(maximum DC output current),
VOUT = VIN -0.5V
ILIMIT
RLIM = 10kΩ
-40°C ≤ TA ≤ +85°C
2200
2365
RLIM = 15kΩ
-40°C ≤ TA ≤ +85°C
1540
1632
1730
TJ = +25°C
1180
1251
1326
-40°C ≤ TA ≤ +85°C
1160
1251
1340
TJ = +25°C
500
530
562
RLIM = 20kΩ
RLIM = 49.9kΩ
mA
485
529
573
RLIM = 210kΩ
121
142
162
ILIM Shorted to IN or GND
50
75
100
RLIM = 10kΩ

2620

RLIM = 15kΩ

1820

RLIM = 20kΩ

1380

RLIM = 49.9kΩ

570

RLIM = 210kΩ

150

ILIM Shorted to IN or GND

75

Short-Circuit Response Time
VOUT = 0V to IOUT = ILIMIT (OUT shorted to ground)
See Figure 2

2

µs
EN Input Leakage Current
VIN = 5V, VEN = 0V and 6V
-0.5

0.5
µA
tON
Turn-On Time
CL = 1µF, RL = 100Ω. See Figure 1


3
ms
tOFF
Turn-Off Time
CL = 1µF, RL = 100Ω. See Figure 1


1
ms
Discharge Resistance (Note 8)
VIN = 5V, Disabled, IOUT =1mA

600

Ω
Discharge Resistance During
Latch-Off
VIN = 5V, Latch-Off, AP2552A/53A Only

1000

Ω
ISHORT
tSHORT
Short-Circuit Current Limit, OUT
Connected to GND
-40°C ≤ TA ≤ +85°C
mA
Enable Pin
ILEAK-EN
Output Discharge
RDIS
RDIS_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 VIN< VUVLO).
The discharge function offers a resistive discharge path for the external storage capacitor for limited time.
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Electrical Characteristics (cont.)
(@TA = +25°C, VIN = 2.7V to 5.5V, VEN = 0V or VEN = VIN, RFAULT = 10kΩ, unless otherwise specified.)
Symbol
Parameter
Test Conditions (Note 6)
Min
Typ
Max
Unit
Reverse Voltage Protection
VRVP
Reverse-Voltage Comparator Trip Point
VOUT – VIN
95
135
190
mV
Reverse Current Limit
VOUT – VIN = 200mV

0.72

A
Time from Reverse-Voltage Condition to
MOSFET Turn Off
(AP2552A/AP2553A)
VIN = 5V
3
4.75
7
ms
VOL
FAULT Output Low Voltage
IFAULT = 1mA


180
mV
IFOH
FAULT Off Current
VFAULT = 6V


1
µA
Assertion or deassertion due to overcurrent
5
7.5
10
ms
Assertion or deassertion due to
reverse-voltage
2
3.75
6
ms
Thermal Shutdown Threshold
Enabled, RLOAD = 1kΩ

160

°C
Thermal Shutdown Threshold under
Current Limit
Enabled, RLOAD = 1kΩ

140

°C

20

°C
IROCP
tTRIG
Fault Flag
FAULT Blanking and Latch Off Time
tBlank_OC
(Over-Current)
FAULT Blanking Time
tBlank_RV
(Reverse-Voltage)
Thermal Shutdown
TSHDN
TSHDN_OCP
THYS

Thermal Shutdown Hysteresis
Typical Performance Characteristics
VEN
50%
TD(ON)
TD(ON)
90%
10%
10%
TD(OFF)
TR
TF
90%
50%
50%
TD(OFF)
TR
VOUT
VEN
50%
VOUT
TF
90%
10%
90%
10%
Figure 1 Voltage Waveforms: AP2552/52A (left), AP2553/53A (right)
Figure 2 Response Time to Short Circuit Waveform
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Typical Performance Characteristics (cont.)
VIN= 5V
RLIM = 20kΩ
ROUT = 5Ω
VIN = 5V
RLIM = 20kΩ
ROUT = 5Ω
2ms/div
Figure 3 Turn-On Delay and Rise Time
2ms/div
Figure 4 Turn-Off Delay and Fall Time
VIN = 5V
RLIM = 20kΩ
ROUT = 0Ω
500µs/div
Figure 5 Device Enabled into Short-circuit
2ms/div
Figure 6 No Load to 1Ω Transient Response
2ms/div
Figure 7 Short-Circuit Current Limit Response
20ms/div
Figure 8 Extended Short-Circuit into Thermal Cycles
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Typical Performance Characteristics (cont.)
1ms/div
Figure 9 Reverse Current Limit Response(AP2552A/AP2553A)
Figure 10 Reverse Current Limit vs. Ambient Temperature
Figure 11 Quiescent Current vs. Ambient Temperature
Figure 12 Quiescent Current vs. Ambient Temperature
Figure 13 Switch On-Resistance vs. Ambient Temperature
Figure 14 Under-Voltage Lock Out vs. Ambient Temperature
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Application Information
The AP2552/53 AND AP2552A/53A are integrated high-side power switches optimized for Universal Serial Bus (USB) that require protection
functions. The power switches are equipped with a driver that controls the gate voltage and incorporates slew-rate limitation. This, along with the
various protection features and special functions, makes these power switches ideal for hot-swap or hot-plug applications.
Protection Features:
Under-Voltage Lockout (UVLO)
Whenever the input voltage falls below UVLO threshold (~2.5V), the power switch is turned off. This facilitates the design of hot-insertion
systems where it is not possible to turn off the power switch before input power is removed.
Over-Current and Short-Circuit Protection
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series
resistance of the current path. When an overcurrent condition is detected, AP2552/53 maintains a constant output current and reduces the
output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting.
For AP2552A/53A, when an overcurrent condition is detected, the devices will limit the current until the overload condition is removed or the
internal deglitch time (7-ms typical) is reached, and AP2552A/53A will be turned off. AP2552A/53A will remain latched off until power is cycled
or the device enable is toggled.
The different overload conditions and the corresponding response of the AP2552/53 and AP2552A/53A are outlined below:
NO
1
Conditions
Short-circuit condition at
start-up
Explanation
Output is shorted before input
voltage is applied or before the
part is enabled
Behavior of the AP2552/53
The IC senses the short circuit and immediately clamps output
current to a certain safe level namely ISHORT.
 At the instance the overload occurs, higher current may flow
for a very short period of time before the current limit function
can react.
 After the current limit function has tripped (reached the overcurrent trip threshold), the device switches into current
limiting mode and the current is clamped at ISHORT /ILIMIT.
The current rises until ILIMIT or thermal limit. Once the threshold
has been reached, the device switches into its current limiting
mode and is set at ILIMIT.
2
Short-circuit or overcurrent
condition
Short-Circuit or Overload
condition that occurs when the
part is enabled.
3
Gradual increase from
nominal operating current to
ILIMIT
Load increases gradually until
the current-limit threshold.(ITRIG)
NO
1
Conditions
Short-circuit condition at
start-up
Explanation
Output is shorted before input
voltage is applied or before the
part is enabled
Behavior of the AP2552A/53A
The IC senses the short circuit and immediately clamps output
current to a certain safe level namely ISHORT. When the internal
deglitch time (7-ms typical) is reached and the devices will be
turned off.
2
Short-circuit or overcurrent
condition
Short-Circuit or Overload
condition that occurs when the
part is enabled.
 At the instance the overload occurs, higher current may flow
for a very short period of time before the current limit function
can react.
 After the current limit function has tripped (reached the overcurrent trip threshold), the device switches into current
limiting mode and the current is clamped at ISHORT /ILIMIT.
When the internal deglitch time (7-ms typical) is reached and
the devices will be turned off.
3
Gradual increase from
nominal operating current to
ILIMIT
Load increases gradually until
the current-limit threshold.(ITRIG)
The current rises until ILIMIT or thermal limit. Once the threshold
has been reached, the device switches into its current limiting
mode and is set at ILIMIT. When the internal deglitch time (7-ms
typical) is reached and the devices will be turned off.
Over-Current FAULT Signal
The FAULT signal will be asserted in response to OCP before the device reaches its current limit. The output current upon FAULT signal
triggered will be lower than the I_limit value. To implement FAULT signal for precision system protection control, it is recommended to leave
enough margin from maximum continuous operating current for each RLIM value condition.
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Application Information (cont.)
Current-Limit Threshold Programming
The current-limit threshold can be programmed using an external resistor. The current-limit threshold is proportional to the current sourced out of
ILIM.
The recommended 1% resistor range for RLIM is 10kΩ ≤RLIM≤210kΩ. Figure 15 includes current-limit tolerance due to variations caused by
temperature and process. This graph does not include the external resistor tolerance. The traces routing the RLIM resistor to the AP2552/53 and
AP2552A/53A should be as short as possible to reduce parasitic effects on the current-limit accuracy.
To design below a maximum current-limit threshold, find the intersection of RLIM and the maximum desired load current on the IOS(max) (ILIM)
curve and choose a value of RLIM above this value. Programming the current limit below a maximum threshold is important to avoid current
limiting upstream power supplies causing the input voltage bus to droop. The resulting minimum current-limit threshold is the intersection of the
selected value of RLIM and the IOS(min) (ILIM) curve.
Best Fit Current-Limit Threshold Equations (ILIMIT):
I LIM ( MAX ) (mA) 
20.08
R
0.904
LIM
k
ILIM( TYP ) (mA ) 
19 .94
RLIM
0.925
k
ILIM(MIN) (mA ) 
20 .26
RLIM
0.956
k
Figure 15 Current-Limit Threshold vs. RLIM
Thermal Protection
Thermal protection prevents the IC from damage when the die temperature exceeds safe margins. This mainly occurs when heavy-overload or
short-circuit faults are present for extended periods of time. The AP2552/53 AND AP2552A/53A implements a thermal sensing to monitor the
operating junction temperature of the power distribution switch. Once the die temperature rises to approximately +160°C (+140°C in case the
part is under current limit), the thermal protection feature activates as follows: The internal thermal sense circuitry turns the power switch off and
the FAULT output is asserted, thus preventing the power switch from damage. Hysteresis in the thermal sense circuit allows the device to cool
down by approximately +20°C before the output is turned back on. This built-in thermal hysteresis feature is an excellent feature, as it avoids
undesirable oscillations of the thermal protection circuit. The switch continues to cycle in this manner until the load fault is removed, resulting in
a pulsed output.
AP2552/AP2553/AP2552A/AP2553A
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AP2552/ AP2553/ AP2552A/ AP2553A
Application Information (cont.)
Reverse-Current and Reverse-Voltage Protection
The USB specification does not allow an output device to source current back into the USB port. In a normal MOSFET switch, current will flow in
reverse direction (from the output side to the input side) when the output side voltage is higher than the input side. A reverse-current limit
(ROCP) feature is implemented in the AP2552/53 AND AP2552A/53A to limit such back currents. The ROCP circuit is activated when the output
voltage is higher than the input voltage. After the reverse current circuit has tripped (reached the reverse current trip threshold), the current is
clamped at this IROCP level.
In addition to ROCP, reverse over-voltage protection (ROVP) is also implemented. The ROVP circuit is activated by the reverse voltage
comparator trip point; i.e., the difference between the output voltage and the input voltage.
For AP2552/53, once ROVP is activated, FAULT assertion occurs at a de-glitch time of 4ms. Recovery from ROVP is automatic when the fault is
removed. FAULT de-assertion de-glitch time is same as the de-assertion time.
For AP2552A/53A, once ROVP is activated and when the condition exists for more than 5ms (TYP), output device is disabled and shut down.
This is called the "Time from Reverse-Voltage Condition to MOSFET Turn Off”. FAULT assertion occurs at a de-glitch time of 4ms after ROVP is
reached. Recovery from this fault is achieved by recycling power or toggling EN. FAULT de-assertion de-glitch time is same as the de-assertion
time.
Special Functions:
Discharge Function
When enable is de-asserted, or when the input voltage is under UVLO level, the discharge function is active. The output capacitor is discharged
through an internal NMOS that has a discharge resistance of 100Ω. Hence, the output voltage drops down to zero. The time taken for discharge
is dependent on the RC time constant of the resistance and the output capacitor.
FAULT Response
The FAULT open-drain output goes active low for any of following faults: Current limit threshold, short- circuit current limit, reverse-voltage
condition or thermal shutdown. The time from when a fault condition is encountered to when the FAULT output goes low is 7ms (TYP). The
FAULT output remains low until over-current, short-circuit current limit and over-temperature conditions are removed. Connecting a heavy
capacitive load to the output of the device can cause a momentary over-current condition, which does not trigger the FAULT due to the 7ms
deglitch timeout. This 7-ms timeout is also applicable for over-current recovery and over-temperature recovery. The AP2552/53 and
AP2552-2/53A are designed to eliminate erroneous over-current reporting without the need for external components, such as an RC delay
network.
For the AP2552/53 and AP2552A/53A when the reverse voltage condition is triggered, FAULT output goes low after 4ms (TYP). This 4ms (TYP)
timeout is also applicable for the recovery from reverse voltage fault.
When the ILIM pin is shorted to IN or GND, current-limit threshold and short-circuit current limit will be clamped at typically 75mA. When the ILIM
pin is shorted to IN or GND, the AP2552/53 and AP2552A/53A FAULT pin will not assert during current limiting conditions; The FAULT pin will
assert during short circuit conditions.
Power Supply Considerations
A 0.01-μF to 0.1-μF X7R or X5R ceramic bypass capacitor between IN and GND, close to the device, is recommended. This limits the input
voltage drop during line transients. Placing a high-value electrolytic capacitor on the input (10μF minimum) and output pin (120µF) is
recommended when the output load is heavy. This precaution also reduces power-supply transients that may cause ringing on the input.
Additionally, bypassing the device output with a 0.1μF to 4.7μF ceramic capacitor improves the immunity of the device to short-circuit transients.
This capacitor also prevents output from going negative during turn-off due to parasitic inductance.
Power Dissipation and Junction Temperature
The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current. Using the maximum operating
ambient temperature (TA) and RDS(ON), the power dissipation can be calculated by:
2
PD = RDS(ON)× I
Finally, calculate the junction temperature:
TJ = PD x ΘJA + TA
Where:
TA = Ambient temperature °C
θJA = Thermal resistance
PD = Total power dissipation
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
11 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Application Information (cont.)
Generic Hot-Plug Applications
In many applications it may be necessary to remove modules or PC boards while the main unit is still operating. These are considered hot-plug
applications. Such implementations require the control of current surges seen by the main power supply and the card being inserted. The most
effective way to control these surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in which a
power supply normally turns on. Due to the controlled rise and fall times of the AP2552/53 AND AP2552A/53A, these devices can be used to
provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature of the AP2552/53 AND AP2552A/53A also
ensures that the switch is off after the card has been removed, and that the switch is off during the next insertion.
Generic Hot-Plug Applications
By placing the AP2552/53 AND AP2552A/53A between the VCC input and the rest of the circuitry, the input power reaches these devices first
after insertion. The typical rise time of the switch is approximately 1ms, providing a slow voltage ramp at the output of the device. This
implementation controls system surge current and provides a hot-plugging mechanism for any device.
Ordering Information
Part Number
AP2552W6-7
AP2552W6-7R
AP2552FDC-7
AP2552FDC-7R
AP2553W6-7
AP2553W6-7R
AP2553FDC-7
AP2553FDC-7R
AP2552AW6-7
AP2552AW6-7R
AP2552AFDC-7
AP2552AFDC-7R
AP2553AW6-7
AP2553AW6-7R
AP2553AFDC-7
Enable
Active
Output Fault
Condition
Low
Output Current
Limits
High
Low
Output Latches
Off
High
AP2553AFDC-7R
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3000/Tape & Reel
-7R
Package
Code
Packaging
W6
W6
SOT26
SOT26
FDC
FDC
W6
W6
FDC
FDC
W6
U-DFN2020-6
U-DFN2020-6
SOT26
SOT26
U-DFN2020-6
U-DFN2020-6
SOT26
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
-7
-7R
-7
-7R
-7
-7R
-7
W6
FDC
FDC
W6
W6
FDC
SOT26
U-DFN2020-6
U-DFN2020-6
SOT26
SOT26
U-DFN2020-6
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
-7R
-7
-7R
-7
-7R
-7
FDC
U-DFN2020-6
3000/Tape & Reel
-7R
12 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Marking Information
(1)
SOT26
( Top View )
5
4
7
6
XX Y W X
1
(2)
2
3
XX : Identification Code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : Internal Code
Device
Package
Identification Code
AP2552W6-7
AP2552W6-7R
AP2553W6-7
AP2553W6-7R
AP2552AW6-7
AP2552AW6-7R
SOT26
SOT26
SOT26
SOT26
SOT26
SOT26
BJ
BJ
BK
BK
BM
BM
AP2553AW6-7
AP2553AW6-7R
SOT26
SOT26
BN
BN
U-DFN2020-6
( Top View )
XX
YWX
XX : Identification Code
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : Internal Code
Device
AP2552FDC-7
AP2552FDC-7R
AP2553FDC-7
AP2553FDC-7R
AP2552AFDC-7
Package
U-DFN2020-6
U-DFN2020-6
U-DFN2020-6
U-DFN2020-6
U-DFN2020-6
Identification Code
BJ
BJ
BK
BK
BM
AP2552AFDC-7R
AP2553AFDC-7
AP2553AFDC-7R
U-DFN2020-6
U-DFN2020-6
U-DFN2020-6
BM
BN
BN
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
13 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
(1)
Package Type: SOT26
A
B C
H
K
M
J
(2)
L
D
SOT26
Dim Min Max Typ
A
0.35 0.50 0.38
B
1.50 1.70 1.60
C
2.70 3.00 2.80
D

 0.95
H
2.90 3.10 3.00
J
0.013 0.10 0.05
K
1.00 1.30 1.10
L
0.35 0.55 0.40
M
0.10 0.20 0.15
0°
8°


All Dimensions in mm
Package Type: U-DFN2020-6
A
A3
A1
Seating Plane
D
D2
Pin #1 ID
E
E2
Z (4x)
L
e
b
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
U-DFN2020-6
Type C
Dim Min
Max
Typ
A
0.57 0.63 0.60
A1 0.00 0.05 0.02
A3
––
––
0.15
b
0.25 0.35 0.30
D
1.95 2.075 2.00
D2 1.55 1.75 1.65
E
1.95 2.075 2.00
E2 0.86 1.06 0.96
e
––
––
0.65
L
0.25 0.35 0.30
Z
––
––
0.20
All Dimensions in mm
14 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1)
Package Type: SOT26
C2
C2
Z
C1
G
Y
Dimensions Value (in mm)
Z
3.20
G
1.60
X
0.55
Y
0.80
C1
2.40
C2
0.95
X
(2)
Package Type: U-DFN2020-6
X2
X1
Y
Y2
Dimensions
C
X
X1
X2
Y
Y1
Y2
Y1
X
C
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
Value
(in mm)
0.650
0.350
1.650
1.700
0.525
1.010
2.400
15 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
Taping Orientation (Note 11)
(1) Package Type: SOT26
(2)
Package Type (-7) : U-DFN2020-6
(3) Package Type (-7R) : U-DFN2020-6
Note:
11. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
16 of 17
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October 2014
© Diodes Incorporated
AP2552/ AP2553/ AP2552A/ AP2553A
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2014, Diodes Incorporated
www.diodes.com
AP2552/AP2553/AP2552A/AP2553A
Document number: DS35404 Rev. 10 - 2
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October 2014
© Diodes Incorporated
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