Intersil ISL9305H 3MHz微处理器电源解决方案

Intersil公司的ISL9305H是密你电源管理IC(mini-PMIC), 集成了两个高效的3MHz同步降压转换器(DCD1和DCD2)以及两个低输入低压降的线路稳压器(LDO1和LDO2), DCD1和DCD2可提供1.5A电流, LDO1和LDO2可提供300A电流,主要用于手机和智能手机,PDA,PMP和手持仪表,DSP内核电源以及用单节锂电池电源的设备.本文介绍了ISL9305H主要特性,方框图, 典型应用电路图以及ISL9305IRTZEVAL1Z评估板电路图,材料清单与PCB布局图.

ISL9305H is an integrated mini Power Management IC (mini-PMIC) for powering low-voltage microprocessor, or applications using a single Li-Ion or Li-Polymer cell battery to power multiple voltage rails. ISL9305H integrates two high-efficiency 3MHz synchronous step-down converters (DCD1 and DCD2) and two low-input, low-dropout linear regulators (LDO1 and LDO2).

The 3MHz PWM switching frequency allows the use of very small external inductors and apacitors. Both step-down converters can enter skip mode under light load conditions to further improve the efficiency and maximize the battery life.

For noise sensitive applications, they can also be programmed through I2C interface to operate in forced PWM mode regardless of the load current condition. The I2C interface supports on-the-fly slew rate control of the output voltage from 0.825V to 3.6V at 25mV/step size for dynamic power saving.
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