FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
REG1 REGULATED OUTPUT VOLTAGE PIN
(VOUT1) (34704A ONLY)
REG6 SWITCHING NODE (SW6) (34704A ONLY)
The inductor is connected between this pin and the VIN
pin.
Connect this pin directly to the load directly and to the
output filter as close to the pin as possible.
REG6 REGULATED OUTPUT VOLTAGE PIN
(VOUT6) (34704A ONLY)
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.
Connect this pin directly to the load directly and to the
output filter as close to the pin as possible.
2
I C SERIAL INTERFACE CLOCK INPUT (SCL)
ANALOG GROUND (AGND)
I2C serial interface clock input.
Analog ground of the IC.
2
I C SERIAL INTERFACE DATA INPUT (SDA)
BATTERY VOLTAGE CONNECTION (VIN)
I2C serial interface data input
Input decoupling /filtering is required for the device to
operate properly.
POWER RESET OUTPUT SIGNAL
(MICROPROCESSOR RESET) (RST)
INTERNAL SUPPLY VOLTAGE (VDDI)
Connect a 1.0 μF low ESR decoupling filter capacitor
between this pin and GND.
This is an open drain output and must be pulled up by an
external resistor to a supply voltage like VIN.
BATTERY DETECTION (LION)
REG7 COMPENSATION NETWORK CONNECTION
(COMP7)
Pull this pin high to VIN to indicate a connection to a Li-Ion
battery.
REG7 compensation network connection.
DUAL FUNCTION IC TURN ON/OFF (ONOFF)
REG7 RESISTOR FEEDBACK NETWORK
This is a hardware enable/disable for the 34704. It can be
connected to a mechanical switch to turn the power On or Off.
REFERENCE VOLTAGE (VREF7) (34704A ONLY)
Connect this pin to the bottom of the feedback resistor
divider.
REG2 BOOST STAGE BOOTSTRAP CAPACITOR
INPUT PIN (BT2U)
REG7 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB7)
(34704A ONLY)
Connect a 1.0 μF capacitor between this pin and SW2U
pin to enhance the gate of the Switch Power MOSFET.
Connect the feedback resistor divider to this pin.
REG2 COMPENSATION NETWORK CONNECTION
(COMP2)
REG7 EXTERNAL POWER MOSFET GATE DRIVE
(DRV7) (34704A ONLY)
REG2 compensation network connection.
REG7 external Power MOSFET gate drive.
REG2 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB2)
REG7 OUTPUT VOLTAGE RETURN PIN (VOUT7)
(34704A ONLY)
Connect the feedback resistor divider to this pin.
This is the discharge path of REG7 output voltage.
REG2 BUCK STAGE BOOTSTRAP CAPACITOR
INPUT PIN (BT2D)
REG6 VOLTAGE FEEDBACK INPUT FOR
VOLTAGE REGULATION/PROGRAMMING (FB6)
(34704A ONLY)
Connect a 1.0 μF capacitor between this pin and SW2D
pin to enhance the gate of the Switch Power MOSFET.
Connect the feedback resistor divider to this pin.
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.
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.
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
18
FREESCALE [ Freescale ]
