33730_10 Datasheet, PDF (4/26 Pages) Freescale Semiconductor, Inc – Switch Mode Power Supply with Multiple Linear Regulators

PIN CONNECTIONS
Table 1. 33730 Pin Definitions(continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on page 11.
Pin Number Pin Name Pin Function Formal Name
Definition
17
18
19
20
21,22
P2
PFD
BOOT
SR
SW
Logic Input Programming Pin 2
Analog
Output
Protection FET Drive
Analog Input
Bootstrap
Analog Input
Slew-rate
Power Output
Switch Node
Programming pin 2 for the V_DD3, V_DDL, V_KAM reference voltages.
Reverse battery protection FET gate drive.
This pin is connected to the bootstrap capacitor.
Slew-rate Control of the switching regulator.
These pins are the source of the internal power switch (N-channel
MOSFET).
23,24
25
26
27
28
29
30
31
VBAT
Power Input
Battery Voltage
Supply
Voltage supply to the IC (external reverse battery protection needed in
some applications).
KA_VBAT Power Input Keep Alive Supply ^{This pin is the keep alive supply input.}
CP
Analog
Charge Pump
External capacitor reservoir of the internal charge pump.
Output
VKAM Power Output Keep Alive Memory ^{Keep-Alive Memory (standby) supply output.}
VDD3
Analog Input V_DD3 Linear Regulator This is a VDD3 regulator output feedback pin.
This pin is also the output of the V_DD3 standby regulator.
VDD3_B
Analog
Output
VDD3 Linear
This pin can be used also as an additional standby regulator without the
Regulator Base Drive ^{external pass transistor.}
GND
Ground
Ground
This pin is a ground.
VIGN
Analog Input
Voltage Ignition
This pin is the ignition switch control input pin. It contains an internal
protection diode.
32
P3
Logic Input Programming Pin 3 ^{Programming pin 3 for the V}DD3^{, V}DDL^{, and V}KAM ^{reference voltages.}
33730
4
Analog Integrated Circuit Device Data
Freescale Semiconductor