TI 公司的TPS657051/52是小型（2-mm x 2-mm WCSP）封裝的3路電源管理單元，主要用于嵌入照相機(jī)模塊或其它手提低功耗消費(fèi)類(lèi)終端設(shè)備。 TPS657051/52包括兩個(gè)效率高達(dá)92%的400mA降壓轉(zhuǎn)換器，輸入電壓從3.3V到6V，固定工作頻率2.25MH ，此外還有一個(gè)200mA LDO，其工作電壓從1.7V到6.0V.本文介紹了TPS657051/52主要特性， 功能方框圖， 應(yīng)用電路和TPS657051/2EVM-522 評(píng)估模塊主要特性，性能指標(biāo)以及電路圖和材料清單（BOM）。

PMU for Embedded Camera Module

TPS657051/52 are small power management units targeted for embedded camera module or other portable low power consumer end equipments. It contains two high efficient step down converters， a low dropout linear regulator and additional supporting functions. The 2.25MHz step-down converter enters a low power mode at light load for maximum efficiency across the widest possible range of load currents. For low noise applications the devices can be forced into fixed frequency PWM mode using the MODE pin. The device allows the use of small inductors and capacitors to achieve a small sized solution. TPS657051/52 provides an output current of up to 400mA on both DCDC converters and integrates one 200mA LDO with different output settings.

TPS657051/52主要特性：

Two 400mA Step-Down Converters

Up to 92% Efficiency

VIN Range for DCDC Converter From 3.3V to 6V

2.25 MHz Fixed Frequency Operation

Power Save Mode at Light Load Current

Output Voltage Accuracy in PWM Mode ±1.5%

100% Duty Cycle for Lowest Dropout

180°Out of Phase Operation

1 General Purpose 200mA LDO

VIN Range for LDO From 1.7V to 6.0V

Available in a 16 Ball WCSP With 0.5mm Pitch

TPS657051/52應(yīng)用：

Digital Cameras

Portable Media Players

Handheld Equipment

圖1.TPS657051/52功能方框圖

圖2.TPS657051/52應(yīng)用電路

TPS657051/2EVM-522 評(píng)估模塊

The TPS657051/2EVM evaluation module （EVM） is designed to help the user easily evaluate and test the operation and functionality of the TPS657051/2. This user’s guide includes setup instructions for the hardware， a schematic diagram， a bill of materials， and printed-circuit board layout drawings for the evaluation module.

TPS657051/2EVM-522 評(píng)估模塊主要特性：

? Input voltage rating

? 2 × 200-mA Step-down converter for TPS657051/2

? 2.25-MHz switching frequency

? 1 General-purpose 200-mA LDO
PS657051/2EVM-522 評(píng)估模塊電和性能指標(biāo)：

圖3.TPS657051/2EVM-522 評(píng)估模塊電路圖

TPS657051/2EVM-522 評(píng)估模塊材料清單(BOM):