3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface

The ISL9305 is an integrated mini Power Management IC (mini-PMIC) ideal for applications of powering low-voltage microprocessor or multiple voltage rails with battery as input sources, such as a single Li-ion or Li-Polymer. ISL9305 integrates two high-efficiency 3MHz synchronous step-down converters (DCD1 and DCD2) and two low-input, low-dropout linear regulators (LDO1 and LDO2).

Features

• Dual 800mA, Synchronous Step-down Converters and Dual

300mA, General-purpose LDOs

• Input Voltage Range

- DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3V to 5.5V

- LDO1/LDO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V

• 400kb/s I2C-bus Series Interface Transfers the Control Data

Between the Host Controller and the ISL9305

• Adjustable Output Voltage

- VODCD1/VODCD2 . . . . . . . . . . . . . . . . . . . . . . . . 0.8V to VIN

• Fixed Output I2C Programmability

- At 25mV/Step . . . . . . . . . . . . . . . . . . . . . . . . 0.825V to 3.6V

• LDO1/LDO2 Output Voltage I2C Programmability

- At 50mV/Step . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9V to 3.6V

• 50μA IQ (Typ) with DCD1/DCD2 in Skip Mode; 20μA IQ (Typ)

for each Enabled LDO

• On-the-fly I2C Programming of DC/DC and LDO Output

Voltages

• DCD1/DCD2 I2C Programmable Skip Mode Under Light

Load or Forced Fixed Switching Frequency PWM Mode

• Small, Thin, 4mmx4mm TQFN Package

Applications

• Cellular Phones, Smart Phones

• PDAs, Portable Media Players, Portable Instruments

• Single Li-ion/Li-Polymer Battery-Powered Equipment

• DSP Core Power

ISL9305属于集成电路（IC） > 线性稳压器控制器。瑞萨科技有限公司制造生产的ISL9305稳压器 - 线性 + 开关此产品族中的产品用于构建执行 DC-DC 转换或电压调节功能的电路，采用的是开关模式和线性稳压器功能的组合。虽然具体的拓扑各不相同，但此类产品的主要目的是将开关模式技术的效率优势与线性稳压技术的低噪声特性结合在一起。