TPS54202X中文资料德州仪器数据手册PDF规格书

1 Features

• Configured for a wide range of applications

– 4.5V to 30V input voltage range

– Selectable adjustable output (TPS542021),

fixed 5V output (TPS542025)

– Up to 2A continuous output current

– 0.6V ± 1.5% reference voltage (25°C)

– Supports low drop out mode

• High efficiency

– Integrated 100mΩ and 60mΩ MOSFETs

– Low 2μA shutdown, 26μA quiescent current

– Pulse frequency modulation (PFM) for high light

load efficiency

• Ease of use

– Peak current mode control with internal loop

compensation

– Fixed 500kHz switching frequency

– Internal 5ms soft start

– Frequency spread spectrum to reduce EMI

– Overcurrent protection for both MOSFETs with

hiccup mode protection

– Non-latched protection for over temperature

protection (OTP), overcurrent protection (OCP),

overvoltage protection (OVP), and undervoltage

lockout (UVLO)

– P2P, B2B with TPS54202

– SOT-23 (6) package

2 Applications

• 12V, 24V distributed power-bus supply

• Industry application

– White goods

• Consumer application

– Audio

– Set-Top Box (STB), Digital Television (DTV)

– Printer

3 Description

The TPS54202x is a 4.5V to 30V input voltage

range, 2A synchronous buck converter. The device

includes two integrated switching FETs, internal loop

compensation and 5ms internal soft start to reduce

component count.

By integrating the MOSFETs and employing the

SOT-23 package, the TPS54202x achieves the high

power density and offers a small footprint on the

PCB. TPS542025 has fixed 5V output which saves

BOM by further reducing FB resistors. TPS542021

has adjustable output by a different FB resistor

configuration.

The TPS54202x operates in pulse frequency

modulation for high light load efficiency and

reduces the power loss. The frequency spread

spectrum operation is introduced for Electromagnetic

Interference (EMI) reduction.

Cycle-by-cycle current limit in both high-side MOSFET

protects the converter in an overload condition and

is enhanced by a low-side MOSFET freewheeling

current limit which prevents current runaway. Hiccup

mode protection is triggered if the overcurrent

condition has persisted for longer than the present

time.