33730_12 Datasheet, PDF (5/28 Pages) Freescale Semiconductor, Inc – Switch Mode Power Supply with Multiple Linear Regulators

PIN CONNECTIONS
Table 2. 33730 Pin Definitions(continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on page 12.
Pin Number
16
17
18
19
20
21,22
Pin Name Pin Function Formal Name
Definition
P1⁽¹⁾
P2⁽¹⁾
PFD
Logic Input
Logic Input
Analog
Output
Programming Pin 1
Programming Pin 2
Protection FET Drive
Programming pin 1 for the V_DD3, V_DDL, and V_KAM reference voltages.
Programming pin 2 for the V_DD3, V_DDL, V_KAM reference voltages.
Reverse battery protection FET gate drive.
BOOT Analog Input
Bootstrap
This pin is connected to the bootstrap capacitor.
SR
Analog Input
Slew-rate
Slew-rate Control of the switching regulator.
SW
Power Output
Switch Node
These pins are the source of the internal power switch (N-channel
MOSFET).
23,24
VBAT
Power Input
Battery Voltage
Supply
Voltage supply to the IC (external reverse battery protection needed in
some applications).
25
KA_VBAT Power Input Keep Alive Supply This pin is the keep alive supply input.
26
CP
Analog
Charge Pump
External capacitor reservoir of the internal charge pump.
Output
27
VKAM Power Output Keep Alive Memory Keep-Alive Memory (standby) supply output.
28
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.
29
VDD3_B
Analog
VDD3 Linear
This pin can be used also as an additional standby regulator without the
Output Regulator Base Drive external pass transistor.
30
GND
Ground
Ground
This pin is a ground.
31
VIGN Analog Input Voltage Ignition ^{This pin is the ignition switch control input pin. It contains an internal}
protection diode.
32
P3⁽¹⁾
Logic Input Programming Pin 3 ^{Programming pin 3 for the V}_DD3^{, V}_DDL^{, and V}_KAM ^{reference voltages.}
Notes
1. Programming pins must never be left floating, they must be tied to ground or protected battery voltage depending on the output voltage
selections desired.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33730
5