The 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 capacitors. 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.

Each step-down converter can supply up to 1.5A load current.

The default output voltage can be set from 0.8V to VIN using

external feedback resistors on the adjustable version, or the

ISL9305H can be ordered in factory pre-set power-up default

voltages in increments of 100mV from 0.9V to 3.6V.

The ISL9305H also provides two 300mA low dropout (LDO)

regulators. The input voltage range is 1.5V to 5.5V allowing them

to be powered from one of the on-chip step-down converters or

directly from the battery. The default LDO output comes with

factory pre-set fixed output voltage options between 0.9V to 3.3V.

The ISL9305H is available in a 4mmx4mm 16 Ld TQFN

package.

特性 Features

? Dual 1.5A, Synchronous Step-down Converters and Dual

300mA, General-purpose LDOs

? Input Voltage Range

- DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V 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 ISL9305H

? 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