AP2553W6-7 - DIODES INC - Datasheet.Live

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

1 of 17

www.diodes.com

October 2014

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

Pin Assignments

Features

 Up to 2.1A Maximum Load Current

 Accurate Adjustable Current Limit, 75mA - 2360mA

 ±6% Accurate Adjustable Current Limit, 1.63A with RLIM = 15k

 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

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.

PAD

GND

OUT

FAULT

ILIM

U-DFN2020-6

(

Top View

)

Top View

SOT26

OUTIN

GND

ILIM

FAULT

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

2 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Typical Applications Circuit

120µF Output Capacitance is a Requirement of USB

Available Options

Part Number Channel Enable Pin (EN) Recommended Maximum

Continuous Load Current (A)

Current-Limit

Protection Package

AP2552 1 Active Low 2.1 Constant-Current

U-DFN2020-6

SOT26

AP2553 1 Active High

AP2552A 1 Active Low 2.1 Latch-Off

U-DFN2020-6

SOT26

AP2553A 1 Active High

Pin Descriptions

Name

Pin Number I/O Function

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

IN 1 1 6 6 I

Input, connect a 0.1µF or greater ceramic capacitor from

IN to GND as close to IC as possible.

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

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

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

FAULT

4 4 3 3 O

Active-low open-drain output, asserted during over-

current, over-temperature, or reverse-voltage conditions.

ILIM 5 5 2 2 O

Use external resistor to set current-limit threshold;

recommended 10k≦RLIM≦232k.

OUT 6 6 1 1 O Output

Exposed

Pad — — Pad Pad —

No internal connection; recommend to connect to GND

externally for improved power dissipation. It should not be

used as electrical ground conduction path.

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

3 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Functional Block Diagram

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

4 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)

Symbol Parameter Ratings Unit

ESD

HBM Human Body Model ESD Protection 2 kV

CDM Charged Device Model ESD Protection 500 V

IEC system

level

Surges per EN61000-4-2. 1999 Applied to Output

Terminals of EVM Note (5) 15 kV

VIN, VOUT, VFAULT ,

VILIM, ,EN

VEN

V Voltage on IN, OUT, FAULT , ILIM, EN, EN -0.3 to +6.5 V

— Continuous FAULT Sink Current 25 mA

— ILIM Source Current 1 mA

ILOAD Maximum Continuous Load Current Internal Limited A

TJ(MAX) Maximum Junction Temperature -40 to +150 °C

TST 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) 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 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

VIN Input Voltage 2.7 5.5 V

IOUT Continuous Output Current (-40°C  TA  +85°C) 0 2.1 A

,EN

VEN

V Enable Voltage 0 5.5 V

VIH High-Level Input Voltage on EN or EN 2.0 VIN V

VIL Low-Level Input Voltage on EN or EN 0 0.8 V

RLIM Current-Limit Threshold Resistor Range

(1% initial tolerance) 10 210 k

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

Document number: DS35404 Rev. 10 - 2

5 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Electrical Characteristics (@TA = +25°C, VIN = 2.7V to 5.5V, VEN = 0V or VEN = VIN, RFAULT = 10k, unless otherwise specified.)

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

Supply

VUVLO 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 VIN = 5.5V, Enabled, OUT = Open, RLIM = 20k  100 140 µA

VIN = 5.5V, Enabled, OUT = Open, RLIM = 210k  80 120 µA

IREV Reverse Leakage Current Disabled, VIN = 0V, VOUT = 5.5V, IREV at VIN  0.01 1 µA

Power Switch

RDS(ON) Switch On-Resistance

SOT26 Package, TJ = +25°C, VIN = 5.0V  70 95

m

-40°C  TA  +85°C   135

U-DFN2020-6 Package TJ = +25°C, VIN = 5.0V  80 105

-40°C  TA  +85°C   150

tR Output Turn-On Rise Time VIN = 5.5V, CL = 1µF, RLOAD = 100. See Figure 1  1.1 1.5 ms

VIN = 2.7V, CL = 1µF, RLOAD = 100.  0.7 1 ms

tF Output Turn-Off Fall Time VIN = 5.5V, CL = 1µF, RLOAD = 100. See Figure 1 0.1  0.5 ms

VIN = 2.7V, CL = 1µF, RLOAD = 100. 0.1  0.5 ms

Current Limit

ILIMIT

Current-Limit Threshold

(maximum DC output current),

VOUT = VIN -0.5V

RLIM = 10k -40°C  TA  +85°C 2200 2365 2542

RLIM = 15k -40°C  TA  +85°C 1540 1632 1730

RLIM = 20k TJ = +25°C 1180 1251 1326

-40°C  TA  +85°C 1160 1251 1340

RLIM = 49.9k TJ = +25°C 500 530 562

-40°C  TA  +85°C 485 529 573

RLIM = 210k 121 142 162

ILIM Shorted to IN or GND 50 75 100

ISHORT Short-Circuit Current Limit, OUT

Connected to GND

RLIM = 10k  2620 

RLIM = 15k  1820 

RLIM = 20k  1380 

RLIM = 49.9k  570 

RLIM = 210k  150 

ILIM Shorted to IN or GND  75 

tSHORT Short-Circuit Response Time VOUT = 0V to IOUT = ILIMIT (OUT shorted to ground)

See Figure 2  2  µs

Enable Pin

ILEAK-EN EN Input Leakage Current VIN = 5V, VEN = 0V and 6V -0.5  0.5 µA

tON Turn-On Time CL = 1µF, RL = 100. See Figure 1   3 ms

tOFF Turn-Off Time CL = 1µF, RL = 100. See Figure 1   1 ms

Output Discharge

RDIS Discharge Resistance (Note 8) VIN = 5V, Disabled, IOUT =1mA  600  

RDIS_LATCH Discharge Resistance During

Latch-Off VIN = 5V, Latch-Off, AP2552A/53A Only  1000  

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

Document number: DS35404 Rev. 10 - 2

6 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Electrical Characteristics (cont.)

(@TA = +25°C, VIN = 2.7V to 5.5V, VEN = 0V or VEN = VIN, RFAULT = 10k, 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

IROCP Reverse Current Limit VOUT – VIN = 200mV  0.72  A

tTRIG

Time from Reverse-Voltage Condition to

MOSFET Turn Off

(AP2552A/AP2553A)

VIN = 5V 3 4.75 7 ms

Fault Flag

VOL FAULT Output Low Voltage IFAULT = 1mA   180 mV

IFOH FAULT Off Current VFAULT = 6V   1 µA

tBlank_OC FAULT Blanking and Latch Off Time

(Over-Current) Assertion or deassertion due to overcurrent 5 7.5 10 ms

tBlank_RV FAULT Blanking Time

(Reverse-Voltage)

Assertion or deassertion due to

reverse-voltage 2 3.75 6 ms

Thermal Shutdown

TSHDN Thermal Shutdown Threshold Enabled, RLOAD = 1k  160  °C

TSHDN_OCP Thermal Shutdown Threshold under

Current Limit Enabled, RLOAD = 1k  140  °C

THYS Thermal Shutdown Hysteresis   20  °C

Typical Performance Characteristics

VEN

90%

VOUT

TD(ON)

10%

TD(OFF)

50% 50%

10%

90%

VEN

90%

VOUT

TD(ON)

10%

TD(OFF)

50% 50%

10%

90%

Figure 1 Voltage Waveforms: AP2552/52A (left), AP2553/53A (right)

Figure 2 Response Time to Short Circuit Waveform

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

7 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Typical Performance Characteristics (cont.)

2ms/div

Figure 3 Turn-On Delay and Rise Time

2ms/div

Figure 4 Turn-Off Delay and Fall Time

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

VIN = 5V

RLIM = 20k

ROUT = 5

VIN= 5V

RLIM = 20k

ROUT = 5

VIN = 5V

RLIM = 20k

ROUT = 0

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

8 of 17

www.diodes.com

October 2014

P2552/ 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

Document number: DS35404 Rev. 10 - 2

9 of 17

www.diodes.com

October 2014

P2552/ 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 Conditions Explanation Behavior of the AP2552/53

1 Short-circuit condition at

start-up

Output is shorted before input

voltage is applied or before the

part is enabled

The IC senses the short circuit and immediately clamps output

current to a certain safe level namely ISHORT.

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 over-

current trip threshold), the device switches into current

limiting mode and the current is clamped at ISHORT /ILIMIT.

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.

NO Conditions Explanation Behavior of the AP2552A/53A

1 Short-circuit condition at

start-up

Output is shorted before input

voltage is applied or before the

part is enabled

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 over-

current 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.

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

Document number: DS35404 Rev. 10 - 2

10 of 17

www.diodes.com

October 2014

P2552/ 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

LIM

The recommended 1% resistor range for R

LIM

is 10k R

LIM

210k. 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 R

LIM

and the maximum desired load current on the I

OS(max)

LIM

)

curve and choose a value of R

LIM

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 R

LIM

and the I

OS(min)

LIM

) curve.

Best Fit Current-Limit Threshold Equations (I

LIMIT





mAI

LIM

MAXLIM 904.0

)(

08.20

)(





94.19

)mA(I

925.0

LIM

)TYP(LIM





26.20

)mA(I

956.0

LIM

)MIN(LIM

Figure 15 Current-Limit Threshold vs. R

LIM

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

Document number: DS35404 Rev. 10 - 2

11 of 17

www.diodes.com

October 2014

P2552/ 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 100. 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-F to 0.1-F 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 (10F 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 0.1F to 4.7F 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:

D = RDS(ON)× I2

Finally, calculate the junction temperature:

J = PD x ΘJA + TA

Where:

A = Ambient temperature °C

JA = Thermal resistance

D = Total power dissipation

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

12 of 17

www.diodes.com

October 2014

P2552/ 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 Enable

Active

Output Fault

Condition

Package

Code Packaging 7” Tape and Reel

Quantity Part Number Suffix

AP2552W6-7

Low

Output Current

Limits

W6 SOT26 3000/Tape & Reel -7

AP2552W6-7R W6 SOT26 3000/Tape & Reel -7R

AP2552FDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7

AP2552FDC-7R FDC U-DFN2020-6 3000/Tape & Reel -7R

AP2553W6-7

High

W6 SOT26 3000/Tape & Reel -7

AP2553W6-7R W6 SOT26 3000/Tape & Reel -7R

AP2553FDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7

AP2553FDC-7R FDC U-DFN2020-6 3000/Tape & Reel -7R

AP2552AW6-7

Low

Output Latches

Off

W6 SOT26 3000/Tape & Reel -7

AP2552AW6-7R W6 SOT26 3000/Tape & Reel -7R

AP2552AFDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7

AP2552AFDC-7R FDC U-DFN2020-6 3000/Tape & Reel -7R

AP2553AW6-7

High

W6 SOT26 3000/Tape & Reel -7

AP2553AW6-7R W6 SOT26 3000/Tape & Reel -7R

AP2553AFDC-7 FDC U-DFN2020-6 3000/Tape & Reel -7

AP2553AFDC-7R FDC U-DFN2020-6 3000/Tape & Reel -7R

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

13 of 17

www.diodes.com

October 2014

P2552/ AP2553/ AP2552A/ AP2553A

Marking Information

(1) SOT26

1 2 3

XX YW X

XX : Identification Code

Y : Year 0~9

X : Internal Code

( Top View )

W : Week : A~Z : 1~26 week;

a~z : 27~52 week; z represents

52 and 53 week

Device Package Identification Code

AP2552W6-7 SOT26 BJ

AP2552W6-7R SOT26 BJ

AP2553W6-7 SOT26 BK

AP2553W6-7R SOT26 BK

AP2552AW6-7 SOT26 BM

AP2552AW6-7R SOT26 BM

AP2553AW6-7 SOT26 BN

AP2553AW6-7R SOT26 BN

(2) U-DFN2020-6

( Top View )

XX Y : Year : 0~9

X : Internal Code

XX : Identification Code

W : Week : A~Z : 1~26 week;

a~z : 27~52 week; z represents

52 and 53 week

Y W X

Device Package Identification Code

AP2552FDC-7 U-DFN2020-6 BJ

AP2552FDC-7R U-DFN2020-6 BJ

AP2553FDC-7 U-DFN2020-6 BK

AP2553FDC-7R U-DFN2020-6 BK

AP2552AFDC-7 U-DFN2020-6 BM

AP2552AFDC-7R U-DFN2020-6 BM

AP2553AFDC-7 U-DFN2020-6 BN

AP2553AFDC-7R U-DFN2020-6 BN

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

14 of 17

www.diodes.com

October 2014

P2552/ 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

(2) Package Type: U-DFN2020-6

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

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

B C

AA1 A3

Seating Plane

Pin #1 ID

Z (4x)

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

15 of 17

www.diodes.com

October 2014

P2552/ 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

(2) Package Type: U-DFN2020-6

Dimensions Value (in mm)

Z 3.20

G 1.60

X 0.55

Y 0.80

C1 2.40

C2 0.95

Dimensions Value

(in mm)

C 0.650

X 0.350

X1 1.650

X2 1.700

Y 0.525

Y1 1.010

Y2 2.400

AP2552/AP2553/AP2552A/AP2553A

Document number: DS35404 Rev. 10 - 2

16 of 17

www.diodes.com

October 2014

P2552/ 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

17 of 17

www.diodes.com

October 2014

P2552/ 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.