33730 datasheet(13/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33730

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

PROGRAMMING PIN 2 (P2)

Programming Pin 2 for the VDD3, VDDL, and VKAM

reference voltage. The output voltage of the VDD3, VDDL

and VKAM regulators can be programmed by the P1, P2, and

P3 pins (see Table 6).

PROGRAMMING PIN 3 (P3)

Programming Pin 3 for the VDD3, VDDL, and VKAM

reference voltages. The output voltage of the VDD3, VDDL

and VKAM regulators can be programmed by the P1, P2, and

P3 pins (see Table 6).

PROTECTION FET DRIVE (PFD)

Reverse battery protection FET gate drive. This pin is an

output drive for the gate of the external Reverse Battery

Protection N-channel FET.

BOOTSTRAP (BOOT)

This pin is connected to the bootstrap capacitor. It

provides the supply power for the switching regulator high-

side drive.

SLEW-RATE (SR)

Slew-rate Control of the switching regulator. The slew-rate

of the switching regulator can be adjusted by connecting this

pin to switch node (SW pin, slow slew-rate selection), BOOT

pin (fast slew-rate selection), or it can be left open (medium

slew-rate selection).

SWITCH NODE (SW)

This pin is the source of the switching regulator internal

power switch (N-channel MOSFET source).

BATTERY VOLTAGE SUPPLY (VBAT)

Voltage supply to the IC (external reverse battery

protection is recommended).

KEEP ALIVE SUPPLY (KA_VBAT)

This pin is the keep alive supply input. This input is reverse

battery protected. This input supplies power to the internal

supply and bias circuits that have to do with this VKAM and

other always-on supplies.

CHARGE PUMP (CP)

External reservoir capacitor of the internal charge pump.

This charge pump provides the voltage needed to sufficiently

enhance the gates of the internal n-channel mosfets (VREF1,

VREF2, and VDDH) during the low battery condition.

KEEP ALIVE MEMORY (VKAM)

Keep Alive Memory (standby) supply output. This output

supplies power for the module Keep-Alive memory. This

output is always on, if the voltage at the KA_VBAT pin is

above 4.5V.

VDD3

LINEAR REGULATOR (VDD3)

This is a VDD3 regulator output feedback pin.The emitter

of VDD3 regulator external NPN pass transitory is connected

to this pin.

This pin can programmed to be the output of the VDD3

Standby regulator (see Table 6).

VDD3 LINEAR REGULATOR BASE DRIVE

(VDD3_B)

This pin can be used also as an additional standby

regulator without the external pass transistor.This output

supplies current into the base of the regulator external pass

NPN transistor.

GROUND (GND)

This pin is the ground pin of the integrated circuit.

VOLTAGE IGNITION (VIGN)

This pin is the turn-on control input that is controlled

through an ignition switch. This pin is reverse battery

protected.

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