MAX8952典型应用电路 (2.5A降压型调节器)

MAX8952 Typical Operating Circuit

The MAX8952 high-efficiency DC-to-DC step-down switching regulator delivers up to 2.5A of output current. The device operates from a 2.5V to 5.5V input voltage range, supporting commonly-used battery technologies in handsets. The output voltage is I²C programmable from 0.77V to 1.40V. Fully differential remote sense ensures precise DC regulation at the load. Total output error is less than ±1.5% over load, line, and temperature.

The IC operates at a 3.25MHz fixed frequency. The high operating frequency minimizes the size of external components. The switching frequency of the converter can be synchronized to the master clock of the application. When synchronizing to an external clock, the IC measures the frequency of the external clock to ensure that the clock is stable before changing the switching frequency to the external clock frequency.

An on-board DAC allows adjustment of the output voltage in 10mV steps. The output voltage can be programmed directly through the I²C interface, or by preloading a set of on-board registers and using the two VID logic signals to select the appropriate register. Other features include internal soft-start control circuitry to reduce inrush current, output overvoltage, overcurrent, and overtemperature protection.

关键特性

2.5A Guaranteed Output Current

I²C Programmable V_OUT (770mV to 1.40V in 10mV Steps)

Initial Accuracy ±0.5% at 1.40V Output

±1.5% Output Accuracy Over Load, Line, and Temperature (DCR ≤ 38.5mΩ)

Power-Save Mode Increases Light Load Efficiency

Fixed 3.25MHz PWM Switching Frequency

Small 1.0µH Inductor

Synchronizes to 13MHz, 19.2MHz, or 26MHz System Clock When Available

Overvoltage and Overcurrent Protection

Operates from 2.5V to 5.5V Input Supply

Thermal Shutdown Protection

On-Chip FET and Synchronous Rectifier

400kHz I²C Interface

< 1µA Shutdown Current

16-Bump, 2mm x 2mm WLP Package

应用/使用

蜂窝电话与智能电话
PDA和MP3播放器
台式PC