TPS2044DR.B中文资料德州仪器数据手册PDF规格书

135-mW -Maximum (5-V Input) High-Side

MOSFET Switch

500 mA Continuous Current per Channel

Short-Circuit and Thermal Protection With

Overcurrent Logic Output

Operating Range . . . 2.7-V to 5.5-V

Logic-Level Enable Input

2.5-ms Typical Rise Time

Undervoltage Lockout

20-mA-Maximum Standby Supply Current

Bidirectional Switch

16-pin SOIC Package

Ambient Temperature Range, –40°C to 85°C

2-kV Human-Body-Model, 200-V

Machine-Model ESD Protection

UL Listed – File No. E169910

description

The TPS2044 and TPS2054 quad powerdistribution

switches are intended for applications

where heavy capacitive loads and short circuits

are likely to be encountered. The TPS2044 and the TPS2054 incorporate in single packages four 135-mW

N-channel MOSFET high-side power switches for power-distribution systems that require multiple power

switches. Each switch is controlled by a logic enable that is compatible with 5-V logic and 3-V logic. Gate drive

is provided by an internal charge pump that controls the power-switch rise times and fall times to minimize

current surges during switching. The charge pump, requiring no external components, allows operation from

supplies as low as 2.7 V.

When the output load exceeds the current-limit threshold or a short is present, the TPS2044 and TPS2054 limit

the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (OCx) logic

output low. When continuous heavy overloads and short circuits increase the power dissipation in the switch

causing the junction temperature to rise, a thermal protection circuit shuts off the switch to prevent damage.

Recovery from a thermal shutdown is automatic once the device has cooled sufficiently. Internal circuitry

ensures the switch remains off until valid input voltage is present.

The TPS2044 and TPS2054 are designed to limit at 0.9-A load. These power-distribution switches are available

in 16-pin small-outline integrated-circuit (SOIC) packages and operate over an ambient temperature range of

–40°C to 85°C.