ISL9305IRTHWCNLZ-T View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

ISL9305IRTHWCNLZ-T

3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface

Renesas Electronics 

DATASHEET

ISL9305H

3MHz Dual 1.5A Step-Down Converters and Dual Low-Input LDOs with I2C

Compatible Interface

FN7724

Rev 2.00

March 7, 2014

The ISL9305H is an integrated mini Power Management IC

(mini-PMIC) for powering low-voltage microprocessors, or

applications using a single Li-Ion or Li-Polymer cell battery to

power multiple voltage rails. The 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 voltage options

from 0.9V to 3.6V in 50mV step.

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.

Related Literature

• FN7605, ISL9305 Data Sheet

• AN1564 “ISL9305 and ISL9305H Evaluation Boards”

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

- 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

2.5V TO 5.5V

C10

10µF

1.5V TO 5.5V

C2

1µF

1.5V TO 5.5V

C3

1µF

PG

VINDCD1

VINDCD2

SW1

FB1

L1 = 1.5µH

R1

SDAT

SCLK ISL9305H

VINLDO1

SW2

FB2

L2 = 1.5µH

R3

VINLDO2

VOLDO1

VOLDO2

GNDDCD1 GNDDCD2 GNDLDO

C6

1µF

1.5A

R2*

C4

10µF

1.5A

*

R4

C5

10µF

300mA

300mA

C7

1µF

*Only for adjustable output version. For fixed output version, directly

connect the FB pin to the output of the buck converter.

FIGURE 1. TYPICAL APPLICATION DIAGRAM

FN7724 Rev 2.00

March 7, 2014

Page 1 of 17

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