TPS54478

Name: TPS54478
Brand: TI
SKU: TPS54478
Price: 1.073 USD

現行

具 Hiccup 電流限制的 2.95V 至 6V 輸入、4A 同步降壓 SWIFT™ 轉換器

立即訂購

產品規格表

document-pdfAcrobat TPS54478 2.95-V to 6-V Input, 4-A Synchrns Step-Down SWIFT™ Cnvrtr w/ Hiccup datasheet (Rev. B) (英文)

TPS54478

現行

產品規格表

立即訂購

產品詳細資料

Rating

Catalog

Operating temperature range (°C)

-40 to 150

Topology

Buck

Type

Converter

Iout (max) (A)

4

Vin (min) (V)

2.95

Vin (max) (V)

6

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

2000

Features

Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable

Control mode

current mode

Vout (min) (V)

0.6

Vout (max) (V)

4.5

Iq (typ) (µA)

525

Duty cycle (max) (%)

98

Rating

Catalog

Operating temperature range (°C)

-40 to 150

Topology

Buck

Type

Converter

Iout (max) (A)

4

Vin (min) (V)

2.95

Vin (max) (V)

6

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

2000

Features

Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable

Control mode

current mode

Vout (min) (V)

0.6

Vout (max) (V)

4.5

Iq (typ) (µA)

525

Duty cycle (max) (%)

98

WQFN (RTE)

16

9 mm² 3 x 3

Two 30-mΩ (typical) MOSFETs for High Efficiency at 4-A Loads
200-kHz to 2-MHz Switching Frequency
0.6-V ± 1% Voltage Reference Over Temperature (–40°C to +150°C)
Start-up With Prebiased Voltage
Synchronizes to External Clock
Adjustable Slow Start / Sequencing
UV and OV Power-Good Output
Cycle by Cycle Current Limit and Hiccup Current Protection
Thermally Enhanced 3-mm × 3-mm 16-Pin WQFN (RTE)
Pin Compatible to TPS54418
Create a Custom Design Using the TPS54478 With the WEBENCH^® Power Designer

Two 30-mΩ (typical) MOSFETs for High Efficiency at 4-A Loads
200-kHz to 2-MHz Switching Frequency
0.6-V ± 1% Voltage Reference Over Temperature (–40°C to +150°C)
Start-up With Prebiased Voltage
Synchronizes to External Clock
Adjustable Slow Start / Sequencing
UV and OV Power-Good Output
Cycle by Cycle Current Limit and Hiccup Current Protection
Thermally Enhanced 3-mm × 3-mm 16-Pin WQFN (RTE)
Pin Compatible to TPS54418
Create a Custom Design Using the TPS54478 With the WEBENCH^® Power Designer

The TPS54478 device is a full featured 6-V, 4-A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54478 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2-MHz switching frequency, and minimizing the IC footprint with a small 3-mm × 3-mm thermally enhanced WQFN package.

The TPS54478 provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (V_REF) over temperature. Efficiency is maximized through the integrated 30-mΩ MOSFETs and 525-µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5 µA by entering a shutdown mode.

Undervoltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage start-up ramp is controlled by the soft-start pin. An open-drain power-good signal indicates the output is within 93% to 107% of its nominal voltage.

Cycle-by-cycle current limit, hiccup overcurrent protection, and thermal shutdown protect the device during an overcurrent condition.

For more SWIFT™ documentation, see the TI website at www.ti.com/swift.

The TPS54478 device is a full featured 6-V, 4-A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54478 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2-MHz switching frequency, and minimizing the IC footprint with a small 3-mm × 3-mm thermally enhanced WQFN package.

The TPS54478 provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (V_REF) over temperature. Efficiency is maximized through the integrated 30-mΩ MOSFETs and 525-µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5 µA by entering a shutdown mode.

Undervoltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage start-up ramp is controlled by the soft-start pin. An open-drain power-good signal indicates the output is within 93% to 107% of its nominal voltage.

Cycle-by-cycle current limit, hiccup overcurrent protection, and thermal shutdown protect the device during an overcurrent condition.

For more SWIFT™ documentation, see the TI website at www.ti.com/swift.

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檢視所有 11

	類型	標題		日期
*	Data sheet	TPS54478 2.95-V to 6-V Input, 4-A Synchrns Step-Down SWIFT™ Cnvrtr w/ Hiccup datasheet (Rev. B)		2018年 4月 18日
	Application note	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	2024年 3月 25日
	Analog Design Journal	Control-Mode Quick Reference Guide (Rev. B)	PDF \| HTML	2023年 8月 29日
	Selection guide	Buck Converter Quick Reference Guide (Rev. B)		2021年 4月 8日
	Application note	Calculating Efficiency (Rev. A)		2020年 3月 6日
	Application note	Minimizing Output Ripple During Startup (Rev. A)		2019年 5月 20日
	Selection guide	SWIFT DC/DC Converters Selector Guide (Rev. G)		2019年 2月 6日
	Selection guide	Power Management Guide 2018 (Rev. R)		2018年 6月 25日
	Application note	Minimizing Output Ripple During Startup		2017年 6月 22日
	User guide	TPS54478EVM-037 4-A, SWIFT Regulator Evaluation Module		2011年 6月 15日
	Application note	Understanding Thermal Dissipation and Design of a Heatsink		2011年 5月 4日

設計與開發

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開發板

TPS54478EVM-037 — 用於具有預偏壓啟動的 TPS54478 同步降壓轉換器的評估模組

The TPS54478EVM-037 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS54478 Synchronous Step-Down Switcher. The EVM operates from a 3V to 6V supply and provides a 1.8V output at 4A.

使用指南: PDF