34704 datasheet(18/54 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34704

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

REG1 REGULATED OUTPUT VOLTAGE PIN

(VOUT1) (34704A ONLY)

Connect this pin directly to the load directly and to the

output filter as close to the pin as possible.

REG1 BOOTSTRAP CAPACITOR INPUT PIN (BT1)

Connect a 1.0

μF capacitor between this pin and SW1 pin

to enhance the gate of the Switch Power MOSFET.

I2C SERIAL INTERFACE CLOCK INPUT (SCL)

I2C serial interface clock input.

I2C SERIAL INTERFACE DATA INPUT (SDA)

I2C serial interface data input

POWER RESET OUTPUT SIGNAL

(MICROPROCESSOR RESET) (RST)

This is an open drain output and must be pulled up by an

external resistor to a supply voltage like VIN.

REG7 COMPENSATION NETWORK CONNECTION

(COMP7)

REG7 compensation network connection.

REG7 RESISTOR FEEDBACK NETWORK

REFERENCE VOLTAGE (VREF7) (34704A ONLY)

Connect this pin to the bottom of the feedback resistor

divider.

REG7 VOLTAGE FEEDBACK INPUT FOR

VOLTAGE REGULATION/PROGRAMMING (FB7)

(34704A ONLY)

Connect the feedback resistor divider to this pin.

REG7 EXTERNAL POWER MOSFET GATE DRIVE

(DRV7) (34704A ONLY)

REG7 external Power MOSFET gate drive.

REG7 OUTPUT VOLTAGE RETURN PIN (VOUT7)

(34704A ONLY)

This is the discharge path of REG7 output voltage.

REG6 VOLTAGE FEEDBACK INPUT FOR

VOLTAGE REGULATION/PROGRAMMING (FB6)

(34704A ONLY)

Connect the feedback resistor divider to this pin.

REG6 BOOTSTRAP CAPACITOR INPUT PIN (BT6)

(34704A ONLY)

Connect a 0.01

μF capacitor between this pin and SW6 pin

to enhance the gate of the Synchronous Power MOSFET.

REG6 SWITCHING NODE (SW6) (34704A ONLY)

The inductor is connected between this pin and the VIN

pin.

REG6 REGULATED OUTPUT VOLTAGE PIN

(VOUT6) (34704A ONLY)

Connect this pin directly to the load directly and to the

output filter as close to the pin as possible.

ANALOG GROUND (AGND)

Analog ground of the IC.

BATTERY VOLTAGE CONNECTION (VIN)

Input decoupling /filtering is required for the device to

operate properly.

INTERNAL SUPPLY VOLTAGE (VDDI)

Connect a 1.0

μF low ESR decoupling filter capacitor

between this pin and GND.

BATTERY DETECTION (LION)

Pull this pin high to VIN to indicate a connection to a Li-Ion

battery.

DUAL FUNCTION IC TURN ON/OFF (ONOFF)

This is a hardware enable/disable for the 34704. It can be

connected to a mechanical switch to turn the power On or Off.

REG2 BOOST STAGE BOOTSTRAP CAPACITOR

INPUT PIN (BT2U)

Connect a 1.0

μF capacitor between this pin and SW2U

pin to enhance the gate of the Switch Power MOSFET.

REG2 COMPENSATION NETWORK CONNECTION

(COMP2)

REG2 compensation network connection.

REG2 VOLTAGE FEEDBACK INPUT FOR

VOLTAGE REGULATION/PROGRAMMING (FB2)

Connect the feedback resistor divider to this pin.

REG2 BUCK STAGE BOOTSTRAP CAPACITOR

INPUT PIN (BT2D)

Connect a 1.0

μF capacitor between this pin and SW2D

pin to enhance the gate of the Switch Power MOSFET.

REG2 POWER SUPPLY INPUT VOLTAGE (PVIN2)

This is the connection to the drain of the high side switch

FET. Input decoupling /filtering is required for proper REG2

operation.

34704 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

34704 Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc

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