FN7931 Rev 3.00

Page 1 of 13

September 20, 2012

FN7931

Rev 3.00

September 20, 2012

ISL9307

3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs

DATASHEET

The ISL9307 is an integrated mini Power Management IC

(mini-PMIC) ideal for applications for powering low-voltage

microprocessor or multiple voltage rails with a battery as an

input source, such as a single Li-ion or Li-polymer. ISL9307

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 efficiency and maximize battery life.

The ISL9307 features EN pins for each channel, thus allowing

startup delay for power sequencing.

The ISL9307 also provides two 300mA low-dropout (LDO)

regulators. The input voltage range is 1.5V to 5.5V, which

allows them to be powered from one of the on-chip step-down

converters or directly from a battery. The default LDO power-up

output comes with factory pre-set fixed output voltage options

between 0.9V and 3.3V.

The ISL9307 is available in a 4mmx4mm 16 Ld TQFN.

Features

• Dual 1500mA, Synchronous Step-down Converters and Dual

300mA, General-purpose LDOs

• Input Voltage Range

- DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V to 5.5V

- VINLDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V

• Adjustable Output Voltage

for each Enabled LDO

• EN Pins for DCD1/DCD2 and LDO1/LDO2

• Small, Thin, 4mmx4mm TQFN

Applications

• Cellular Phones, Smart Phones

• PDAs, Portable Media Players, Portable Instruments

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

•DSP Core Power

FIGURE 1. TYPICAL APPLICATION DIAGRAM

ISL9307

2.5V TO 5.5V

1500mA

1500mA

1.5V TO 5.5V

300mA

300mA

1µF

10µF

10µF

1µF

1µF

ENDCD1

VINDCD1

VINLDO

VINDCD2

ENDCD2

ENLDO1

ENLDO2

GNDDCD1

GNDDCD2

GNDLDO

10µF

VOLDO2

SW 1

FB1

SW 2

FB2

VOLDO1

NOTE: ONLY FOR ADJUSTABLE OUTPUT VERSION . FOR FIXED

OUTPUT VERSION, DIRECTLY CONNECT THE FB PIN TO THE

OUTPUT OF THE BUCK CONVERTER .