TPS54331DR/TPS54331Ddatasheet_TPS54331DR资源-CSDN文库

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### TPS54331DR/ TPS54331D 数据手册解析 #### 概述 TPS54331DR/ TPS54331D 是一款高效能、非同步降压转换器，适用于需要高效率且稳定电源供应的应用场景。该器件集成了低导通电阻 (Rds(on)) 的高端 MOSFET，并具有自动脉冲跳过 Eco-mode™ 特性，能够在轻负载条件下提高效率。此外，它还提供了多种保护机制，确保在不同工作条件下系统稳定运行。 #### 主要特性 - **宽输入电压范围**：支持从 3.5V 至 28V 的输入电压范围。 - **可调节输出电压**：输出电压可调降至 0.8V。 - **集成的 MOSFET**：集成的 80mΩ 高端 MOSFET 支持高达 3A 的连续输出电流。 - **高效率轻负载模式**：通过脉冲跳过 Eco-mode™ 功能，在轻负载条件下自动提高效率。 - **低关断电流**：1µA 的关断静态电流，适用于电池供电应用。 - **固定开关频率**：采用固定的 570kHz 开关频率。 - **内部斜率补偿**：简化外部补偿设计并减少元件数量。 - **可编程欠压锁定阈值**：通过电阻分压器设置输入欠压锁定 (UVLO) 的阈值。 - **过电压瞬态保护**：防止启动及瞬态条件下的电压过冲。 - **逐周期电流限制**：提供过载保护。 - **频率折返与热关断**：在过载情况下进行频率折返，并提供热关断保护。 - **易于使用的封装**：采用 8 引脚 SOIC 封装，优化内部布局以改善热性能。 - **软件工具支持**：SwitcherPro™ 软件工具提供设计支持 (http://focus.ti.com/docs/toolsw/folders/print/switcherpro.html)。 - **SWIFT™ 文档**：可通过 TI 官网获取更多 SWIFT™ 相关文档 (www.ti.com/swift)。 #### 应用领域 - **消费电子产品**：如机顶盒、客户终端设备 (CPE)、液晶显示器、外设及电池充电器等。 - **工业与车载音频电源**：为各种工业应用和车载音频设备提供稳定的电源解决方案。 - **标准电压应用**：如 5V 和 12V 的电源供应。 #### 效率曲线分析根据提供的效率曲线图，可以看出 TPS54331DR/ TPS54331D 在不同的输入电压下 (12V, 18V, 24V, 28V, 5V)，以及在输出电压为 3.3V 时的效率变化情况。随着负载电流的增加，效率逐渐提升。例如，当输入电压为 12V 且输出电压为 3.3V 时，效率从轻载时的大约 60% 提升到满载时的近 90%。这表明了 TPS54331DR/ TPS54331D 在宽泛的工作范围内均能保持较高的转换效率。 #### 典型应用电路 TPS54331 的典型应用电路包括输入电源 (VIN)、输出电压 (VOUT)、使能端 (EN) 等关键组件。该电路还包括了外部补偿组件 (COMP)、软启动控制 (SS)、电流检测 (VSENSE) 等部分。此外，还有外部电容 (CI, CBOOT, CO, C1, C2) 以及电阻 (R1, R2, R3) 等辅助元件，用于实现完整的电源转换系统。 TPS54331DR/ TPS54331D 是一款高性能、高效率的降压转换器，适用于需要稳定电源的各种应用场景。通过其丰富的特性和灵活的设计选项，能够满足不同领域的电源需求。

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FEATURES

DESCRIPTION

APPLICATIONS

100

0.01 0.1 1 10

Efficiency-%

I -LoadCurrent- A

V =3.3V

V =12V

V =18V

V =24V

V =28V

V =5V

VIN

GND

BOOT

VSENSE

COMP

VIN

VOUT

TPS54331

BOOT

Ren1

Ren2

TPS54331

www.ti.com

...................................................................................................................................................... SLVS839B – JULY 2008 – REVISED OCTOBER 2008

3A, 28V INPUT, STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™

• 3.5V to 28V Input Voltage Range

• Adjustable Output Voltage Down to 0.8V

The TPS54331 is a 28-V, 3-A non-synchronous buck

converter that integrates a low Rds(on) high side

• Integrated 80 m Ω High Side MOSFET Supports

MOSFET. To increase efficiency at light loads, a

up to 3A Continuous Output Current

pulse skipping Eco-mode™ feature is automatically

• High Efficiency at Light Loads with a Pulse

activated. Furthermore, the 1 µ A shutdown supply

Skipping Eco-mode™

current allows the device to be used in battery

powered applications. Current mode control with

• Fixed 570kHz Switching Frequency

internal slope compensation simplifies the external

• Typical 1 µ A Shutdown Quiescent Current

compensation calculations and reduces component

• Adjustable Slow Start Limits Inrush Currents

count while allowing the use of ceramic output

capacitors. A resistor divider programs the hysteresis

• Programmable UVLO Threshold

of the input under-voltage lockout. An overvoltage

• Overvoltage Transient Protection

transient protection circuit limits voltage overshoots

• Cycle by Cycle Current Limit, Frequency Fold

during startup and transient conditions. A cycle by

Back and Thermal Shutdown Protection

cycle current limit scheme, frequency fold back and

thermal shutdown protect the device and the load in

• Available in Easy-to-Use SOIC8 Package

the event of an overload condition. The TPS54331 is

• Supported by SwitcherPro™ Software Tool

available in an 8-pin SOIC package that has been

(http://focus.ti.com/docs/toolsw/folders/print/s

internally optimized to improve thermal performance.

witcherpro.html )

• For SWIFT™ Documentation, See the TI

Website at www.ti.com/swift

• Consumer Applications such as Set-Top

Boxes, CPE Equipment, LCD Displays,

Peripherals, and Battery Chargers

• Industrial and Car Audio Power Supplies

• 5V, 12V and 24V Distributed Power Systems

SIMPLIFIED SCHEMATIC EFFICIENCY

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 SWIFT, Eco-mode, SwitcherPro are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

ABSOLUTE MAXIMUM RATINGS

(1)

PACKAGE DISSIPATION RATINGS

(1) (2) (3)

TPS54331

SLVS839B – JULY 2008 – REVISED OCTOBER 2008 ......................................................................................................................................................

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

ORDERING INFORMATION

(1)

PACKAGE SWITCHING FREQUENCY PART NUMBER

(2)

– 40 ° C to 150 ° C 8 pin SOIC 570 kHz TPS54331D

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2) The D package is also available taped and reeled. Add an R suffix to the device type (i.e., TPS54331DR). See applications section of

data sheet for layout information.

over operating free-air temperature range (unless otherwise noted)

VALUE UNIT

VIN – 0.3 to 30

EN – 0.3 to 5

BOOT 38

Input Voltage V

VSENSE – 0.3 to 3

COMP – 0.3 to 3

SS – 0.3 to 3

BOOT-PH 8

Output Voltage PH – 0.6 to 30 V

PH (10 ns transient from ground to negative peak) – 5

EN 100 µ A

BOOT 100 mA

Source Current

VSENSE 10 µ A

PH 9 A

VIN 9 A

Sink Current COMP 100

µ A

SS 200

Electrostatic Discharge (HBM) 2 kV

Electrostatic Discharge (CDM) 500 V

Operating Junction Temperature – 40 to 150 ° C

Storage Temperature – 65 to 150 ° C

(1) Stresses beyond 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-rated conditions for extended periods may affect device reliability.

PACKAGE THERMAL IMPEDANCE JUNCTION TO PSEUDO THERMAL IMPEDANCE JUNCTION TO

AMBIENT TOP

SOIC8 100 ° C/W 5 ° C/W

(1) Maximum power dissipation may be limited by overcurrent protection

(2) Power rating at a specific ambient temperature T

should be determined with a junction temperature of 150 ° C. This is the point where

distortion starts to substantially increase. Thermal management of the PCB should strive to keep the junction temperature at or below

150 ° C for best performance and long-term reliability. See power dissipation estimate in application section of this data sheet for more

information.

(3) Test board conditions:

a. 2 inches x 1.5 inches, 2 layers, thickness: 0.062 inch

b. 2-ounce copper traces located on the top and bottom of the PCB

c. 6 thermal vias located under the device package

Product Folder Link(s): TPS54331

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

TPS54331

www.ti.com

...................................................................................................................................................... SLVS839B – JULY 2008 – REVISED OCTOBER 2008

over operating free-air temperature range (unless otherwise noted)

MIN TYP MAX UNIT

Operating Input Voltage on (VIN pin) 3.5 28 V

Operating junction temperature, T

– 40 150 ° C

= – 40 ° C to 150 ° C, VIN = 3.5V to 28V (unless otherwise noted)

DESCRIPTION TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY VOLTAGE (VIN PIN)

Internal undervoltage lockout threshold Rising and Falling 3.5 V

Shutdown supply current EN = 0V, VIN = 12V, – 40 ° C to 85 ° C 1 4 µ A

Operating – non switching supply current VSENSE = 0.85 V 110 190 µ A

ENABLE AND UVLO (EN PIN)

Enable threshold Rising and Falling 1.25 1.35 V

Input current Enable threshold – 50 mV -1 µ A

Input current Enable threshold + 50 mV -4 µ A

VOLTAGE REFERENCE

Voltage reference 0.772 0.8 0.828 V

HIGH-SIDE MOSFET

On resistance BOOT-PH = 3 V, VIN = 3.5 V 115 200 m Ω

BOOT-PH = 6 V, VIN = 12 V 80 150

ERROR AMPLIFIER

Error amplifier transconductance (gm) – 2 µ A < ICOMP < 2 µ A, V(COMP) = 1 V 92 µ mhos

Error amplifier DC gain

(1)

VSENSE = 0.8 V 800 V/V

Error amplifier unity gain bandwidth

(1)

5 pF capacitance from COMP to GND pins 2.7 MHz

Error amplifier source/sink current V(COMP) = 1.0 V, 100 mV overdrive ± 7 µ A

Switch current to COMP transconductance VIN = 12 V 12 A/V

SWITCHING FREQUENCY

TPS54331 Switching Frequency VIN = 12V, 25 ° C 456 570 684 kHz

Minimum controllable on time VIN = 12V, 25 ° C 105 130 ns

Maximum controllable duty ratio

(1)

BOOT-PH = 6 V 90 93 %

PULSE SKIPPING ECO-MODE™

Pulse skipping Eco-mode™ switch current threshold 160 mA

CURRENT LIMIT

Current limit threshold VIN = 12 V 3.5 5.8 A

THERMAL SHUTDOWN

Thermal Shutdown 165 ° C

SLOW START (SS PIN)

Charge current V(SS) = 0.4 V 2 µ A

SS to VSENSE matching V(SS) = 0.4 V 10 mV

(1) Specified by design

Product Folder Link(s): TPS54331

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