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Advance Datasheet

High-side Power Distribution Switch with Enable AP2821

Mar. 2013 Rev 2. 0 BCD Semiconductor Manufacturing Limited

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

•

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

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