34704 datasheet(6/54 Pages) FREESCALE

6 / 54 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

34704

PIN CONNECTIONS

FB7

Input

REG7 voltage feedback

input for voltage

regulation/programming

Connect the feedback resistor divider to this pin.

AGND1

Pin 30 is connected to AGND

DRV7

Output

REG7 external Power

MOSFET gate drive

REG7 external Power MOSFET gate drive.

NC3

No Connect

Pin 31 is not connected

VOUT7

Output

REG7 output voltage

return pin.

This is the discharge path of REG7 output voltage.

PGND1

Pin 32 is connected to PGND

FB6

Input

REG6 voltage feedback

input for voltage

regulation/programming

Connect the feedback resistor divider to this pin.

AGND2

Pin 33 is connected to AGND

BT6

Passive

REG6 bootstrap capacitor

input pin.

Connect a 0.01

μF capacitor between this pin and SW6 pin to

enhance the gate of the Synchronous Power MOSFET.

NC4

No Connect

Pin 34 is not connected

SW6

Output

REG6 switching node

The inductor is connected between this pin and the VIN pin.

PGND2

Pin 35 is connected to PGND

VOUT6

Output

REG6 regulated output

voltage pin

Connect this pin directly to the load directly and to the output

filter as close to the pin as possible.

PGND3

Pin 36 is connected to PGND

A/B

AGND

Ground

Analog ground of the IC

Analog ground of the IC.

A/B

VIN

Power

Battery voltage

connection

Input decoupling /filtering is required for the device to operate

properly.

A/B

VDDI

Output

Internal supply voltage

Connect a 1.0

μF low ESR decoupling filter capacitor between

this pin and GND.

A/B

LION

Input

Battery Detection

Always pull this pin High with a 470kohm Resistor to indicate

Input power is present.

A/B

ONOFF

Input

Dual function IC turn On/

Off

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

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

A/B

BT2U

Passive

REG2 Boost Stage

bootstrap capacitor input

Connect a 1.0

μF capacitor between this pin and SW2U pin to

enhance the gate of the Switch Power MOSFET.

A/B

COMP2

Passive

REG2 compensation

network connection

REG2 compensation network connection.

A/B

FB2

Input

REG2 voltage feedback

input for voltage

regulation/programming

Connect the feedback resistor divider to this pin.

A/B

BT2D

Passive

REG2 Buck Stage

bootstrap capacitor input

Connect a 1.0

μF capacitor between this pin and SW2D pin to

enhance the gate of the Switch Power MOSFET.

A/B

PVIN2

Power

REG2 power supply input

voltage

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

Input decoupling /filtering is required for proper REG2 operation.

Use a 10uf decoupling capacitor for better performance

Table 2. 34704 Pin Definitions (continued)

A functional description of each pin can be found in the Functional Pin Description section beginning on page 17.

Pin Number Device Pin Name Pin Function

Formal Name

Definition

34704 Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc

34704 Datasheet(HTML) 6 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL