TI公司的LP8758是四路DC/DC降压电源转换器,包含有四个降压DC/DC转换器核,最大输出电流16A,自动PWM-PFM和强迫PWM工作模式,输出电压0.5 V - 3.36 V,由I2C兼容的串口控制,主要用在智能手机,电子书和平板电脑以及游戏机.本文介绍了LP8758-B0主要特性,框图和四相应用配置图,以及评估板LP8758EVM主要特性,电路图,材料清单和PCB设计图.

The LP8758 is designed to meet the power management requirements of the latest application processors in mobile phones and similar portable applications. The device contains four step-down DC-DC converter cores, which are bundled together in a single 4-phase buck converter. The device is controlled by an I²C-compatible serial interface.

The automatic PWM-PFM (AUTO mode) operation, together with the automatic phase adding/shedding, maximizes efficiency over a wide output-current range. The LP8758 supports remote differential voltage sensing to compensate IR drop between the regulator output and the point-of-load, thus improving the accuracy of the output voltage.

The LP8758 supports programmable start-up and shutdown delays synchronized to Enable signal.

The protection features include short-circuit protection, current limits, input supply UVLO, and temperature warning and shutdown functions. Several error flags are provided for status information of the device. In addition, the LP8758 device supports load current measurement without the addition of external current sense resistors. During start-up and voltage change, the device controls the output slew rate to minimize output voltage overshoot and the inrush current.

LP8758-B0主要特性:

High-Efficiency Step-Down Four-Phase DC-DC Converter Cores:
Maximum Output Current 16 A
Auto PWM-PFM and Forced-PWM Operations
Auto Phase Adding/Shedding and Force Multi- Phase Operations
Remote Differential Feedback Voltage Sensing
Programmable Output Voltage Slew-Rate from 30 mV/µs to 0.5 mV/µs
V_OUT Range = 0.5 V to 3.36 V with DVS
Programmable Start-up and Shutdown Delays with Enable Signal
I²C-Compatible Interface which Supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) Modes
Interrupt Function with Programmable Masking
Load Current Measurement
Output Short-Circuit and Overload Protection
Spread-Spectrum Mode and Phase Interleaving for EMI Reduction
Overtemperature Warning and Protection
Undervoltage Lockout (UVLO)

LP8758-B0应用:

• Smart Phones, eBooks and Tablets
• Gaming Devices

图1.LP8758-B0功能框图

图2.LP8758-B0四相应用配置图

评估板LP8758EVM

The LP8758EVM demonstrates the integrated circuit LP8758 from Texas Instruments. The LP8758 is a high-performance, multiphase step-down converter designed to meet the power management requirements of the latest applications processors in mobile phones and similar portable applications. The device contains four step-down DC-DC converter cores, which are bundled together in a single 4-phase buck converter. The LP8758 is capable of driving up to 16A of load current with excellent combination of solution size and efficiency. The device is controlled via a PC and the supplied GUI.A50.

评估板LP8758EVM主要特性:

Software Controller
USB-TO-I2C interface supports 3.4 MHz clock rate on the I2C bus
Versatile GUI:  Output current measurement and status indicators.
Console application allows running scripts. Application can execute user specified scripts
Convenient test points for all I/O’s

图3.评估板LP8758EVM外形图

图4.评估板LP8758EVM电路图
评估板LP8758EVM材料清单:



图5.评估板LP8758EVM PCB顶层视图

图6.评估板LP8758EVM PCB设计图(顶层)

图7.评估板LP8758EVM PCB设计图(二层:地线)

图8.评估板LP8758EVM PCB设计图(三层:VIN)

图9.评估板LP8758EVM PCB设计图(底层)
详情请见:
http://www.ti.com/lit/ds/snvsa06a/snvsa06a.pdf
和http://www.ti.com/lit/ug/snvu421/snvu421.pdf

snvsa06a.pdf
snvu421.pdf