PIN CONNECTIONS
Table 1.
Pin Function Description (continued)
A functional description of each pin can be found in the
FUNCTIONAL PIN DESCRIPTION
section beginning on
page 16.
Pin
20
Pin Name
CS
Formal Name
Current Sense
Definition
Current sense pin of the LDO. Overcurrent protection of the linear regulator external
power MOSFET. The voltage drop over the LDO current sense resistor RS is sensed
between the CS and LDO pins. The LDO current limit can be adjusted by selecting
the proper value of the current sensing resistor RS.
LDO gate drive of the external pass N-channel MOSFET.
The input supply pin for the integrated circuit. The internal circuits of the IC are
supplied through this pin.
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is
recommended.
I
2
C address selection. This pin can either be left open, tied to VDDI, or grounded
through a 10 kΩ resistor.
Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2
inputs determines operation mode and type of power sequencing of the IC.
Enable 2 Input. The combination of the logic state of the Enable 1 and Enable 2
inputs determines operation mode and type of power sequencing of the IC.
This pin allows programming of the Power-ON Reset delay by means of an external
RC network.
The Reset Control circuit monitors both the switching regulator and the LDO
feedback voltages. It is an open drain output and has to be pulled up to some supply
voltage (e.g., the output of the LDO) by an external resistor.
This pin sets the CLKSYN pin as either an oscillator output or a synchronization input
pin. The CLKSEL pin is also used for the I
2
C address selection.
Oscillator output/synchronization input pin.
21
22
LDRV
VIN1
Linear Drive
Input Voltage 1
23
VDDI
Power Supply
26
ADDR
Address
27
EN1
Enable 1
28
EN2
Enable 2
29
RT
Reset Timer
30
RST
Reset Output
(Active LOW)
31
CLKSEL
Clock Selection
32
CLKSYN
Clock Synchronization
34701
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
