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