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
    - DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 3.3V
• 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