ISL9305 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

ISL9305

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

Renesas Electronics 

ISL9305

Pin Configuration

ISL9305

(16 LD 4x4 TQFN)

TOP VIEW

16 15 14 13

VINDCD1 1

12 VINDCD2

FB1 2

SCLK 3

SDAT 4

5

E-PAD

6

7

11 FB2

10 DCDPG

9 GNDLDO

8

Pin Descriptions

PIN

NUMBER

(TQFN)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

E-pad

NAME

VINDCD1

FB1

SCLK

SDAT

VINLDO1

VOLDO1

VOLDO2

VINLDO2

GNDLDO

DCDPG

FB2

VINDCD2

SW2

GNDDCD2

GNDDCD1

SW1

E-pad

DESCRIPTION

Input voltage for buck converter DCD1 and it also serves as the power supply pin for the whole internal digital/ analog

circuits.

Feedback pin for DCD1, connect external voltage divider resistors between DCDC1 output, this pin and ground. For

fixed output versions, connect this pin directly to the DCD1 output.

I2C interface clock pin.

I2C interface data pin.

Input voltage for LDO1.

Output voltage of LDO1.

Output voltage of LDO2.

Input voltage for LDO2.

Power ground for LDO1 and LDO2.

The DCDPG pin is an open-drain output to indicate the state of the DCD1/DCD2 output voltages. When both DCD1

and DCD2 are enabled, the output is released to be pulled high by an external pull-up resistor if both converter

voltages are within the power-good range. The pin will be pulled low if either DCD is outside their range. When only

one DCD is enabled, the state of the enabled DCD’s output will define the state of the DCDPG pin. The DCDPG state

can be programmed for a delay of up to 200ms before being released to rise high. The programming range is

1ms~200ms through the I2C interface.

Feedback pin for DCD2, connect external voltage divider resistors between DCD2 output, this pin and ground. For

fixed output versions, connect this pin directly to the DCD2 output.

Input voltage for buck converter DCD2.

Switching node for DCD2, connect to one terminal of the inductor.

Power ground for DCD2.

Power ground for DCD1.

Switching node for DCD1, connect to one terminal of the inductor.

Exposed Pad. Connect to system ground.

FN7605 Rev 2.00

February 9, 2015

Page 3 of 17

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