Diodes AP2821 User Manual

High-side Power Distribution Switch with Enable AP2821

Advance Datasheet

General Description

The AP2821 is an integrated high-side power switch
that consists of TTL compatible enables input, a
charge pump, and N-Channel MOSFET. The switch’s
low RDS (ON), 120mΩ, meets USB voltage drop
requirements. It includes soft-start to limit inrush
current, over-current protection with fold-back, and
thermal shutdown to avoid switch failure during hot
plug-in. Under voltage lockout (UVLO) function is
used to ensure the device remain off unless there is a
valid input voltage present. And no reverse current
when power off, with shutdown pull-low resistor to
discharge the output capacitor when EN is disable.

The AP2821 is available in standard package of
SOT-23-5.

Features

•

Low MOSFET on Resistance: 120mΩ

=5.0V

@V

IN

Compliant to USB Specifications

•

• Operating Voltage Range: 2.7V to 5.5V

• Low Supply Current: 35μA (Typ.)

• Low Shutdown Current: <1μA

• Current Limit with Fold-back: 2A

• Under-voltage Lockout

• Soft Start-up

• Over-current Protection

• Over Temperature Protection

• Load Short Protection with Fold-back

• No Reverse Current when Power off

• Pass System ESD: IEC61000-4-2

± 16KV (Air Discharge) and ± 8KV (Contact
Discharge) on USB Connector

Applications

• USB Power Management

USB Bus/Self Powered Hubs

•

• Hot-plug Power Supplies

• Battery-charger Circuits

• Notebooks, Motherboard PCs

Figure 1. Package Type of AP2821

SOT-23-5

Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited

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Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Pin Configuration

K Package

（SOT-23-5）

Figure 2. Pin Configuration of AP2821 (Top View)

Pin Descriptions

Pin No. Name Descriptions

1 VOUT Switch Output Voltage
2 GND Ground
3 EN Chip Enable Control Input, Active High

4, 5 VIN Supply Input Pin

Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited

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Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Functional Block Diagram

VIN

EN

3

4, 5

GND

2

Clock

Band Gap
Reference

UVLO

Gate Control

Over Current

Limiting

Thermal

Sense

Figure 3. Functional Block Diagram of AP2821

CMP

Current

Sense

Shutdown

Signal

1

VOUT

Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited

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Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Ordering Information

AP2821 -

Circuit Type

Package
K: SOT-23-5

Package

SOT-23-5

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant

and Green.

Temperature

Range

-40 to 85°C

Part Number Marking ID Packing Type

AP2821KTR-G1 G4E Tape & Reel

G1: Green

TR: T ape & Reel

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Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Power Supply Voltage VIN 6.0 V
Operating Junction Temperature

Range
Storage Temperature Range T
Lead Temperature (Soldering,10

Seconds)
Thermal Resistance
(Junction to Ambient)

ESD (Machine Model)

150 ºC

T

J

-65 to 150 ºC

STG

260 ºC

T

LEAD

θ

JA

235 ºC/W
200 V

ESD (Human Body Model) 2000 V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage VIN 2.7 5.5 V
Ambient Operation Temperature

Range

-40 85 °C

T

A

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t

f

Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Electrical Characteristics

(VIN=5.0V, CIN=4.7μF, C

Parameter Symbol Test Conditions Min Typ Max Unit

=4.7μF , Typical TA=25°C, unless otherwise specified)

OUT

Input Voltage Range VIN

Switch On Resistance R

Current Limit I

Supply Current I

Fold-back Short Current I

Shutdown Supply Current I

Output Leakage Current I

Enable High Voltage V

Enable Low Voltage V

DS(ON)

LIMIT

SUPPLY

SHORT

SHUTDOWN

LEAKAGE

ENH

ENL

VIN=5V, I

V

OUT

VIN=5V, R

V

OUT

=0.5A 120 140 mΩ

OUT

=4.0V 1.5 2.0 2.8 A

Open 35 65 μA

LOAD

=0V 1.5 A

VEN=0V, Shutdown Mode 0.1 1 μA

VEN=0V, V

=0V 0.1 1 μA

OUT

Enable Logic High 2.0 6.0 V

Enable Logic Low 0 1.2 V

2.7 5.5 V

Enable Pin Input Current IEN Force 0V to 5.0V at EN Pin 0 1.0 μA
Under Voltage Lockou

Threshold Voltage
Under Voltage Hysteresis V

Reverse Current I

V

VIN Increasing from 0V 2.2 2.5 2.7 V

UVLO

0.2 V

UVLOHY

VEN=0V, V

REVERSE

OUT>VIN

0.1 1.0 μA

Shutdown Pull Low Resistance R

DISCHARGE

Output Turn-on Time tON
Thermal Shutdown

Temperature

T

Thermal Shutdown Hysteresis T
Thermal Resistance

(Junction to Case)

VEN is disable 100 250

OTSD

HYOTSD

θ

JC

From Enable Active to 90% o
Output, R

=10Ω

L

1.9 ms

145

20

70 ºC/W

Ω

o

C

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