TPS65251 - 4.5V 至 18V 输入、3A/2A/2A 输出、三路同步降压转换器

TPS65251是TI德州仪器公司的一款转换器（集成开关）产品，TPS65251是4.5V 至 18V 输入、3A/2A/2A 输出、三路同步降压转换器，本站介绍了TPS65251的封装应用图解、特点和优点、功能等，并给出了与TPS65251相关的TI元器件型号供参考。

TPS65251 - 4.5V 至 18V 输入、3A/2A/2A 输出、三路同步降压转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

Wide Input Supply Voltage Range (4.5 to 18 V)
0.8 V, 1% Accuracy Reference
Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)
Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)
Adjustable Switching Frequency 300 kHz to 2.2 MHz Set by External Resistor
Dedicated Enable for Each Buck
External Synchronization Pin for Oscillator
External Enable/Sequencing and Soft-Start Pins
Adjustable Current Limit Set By External Resistor
Soft-Start Pins
Current-Mode Control With Simple Compensation Circuit
Powergood
Optional Low-Power Mode Operation for Light Loads
VQFN Package, 40-Pin 6 mm × 6 mm RHA

产品应用

Set Top Boxes
Blu-ray DVD
DVR
DTV
Car Audio/Video
Security Camera

产品说明

The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.

The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS65251	VQFN (40)	6.00 mm × 6.00 mm

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