TERMINAL CONNECTIONS
Table 1. Terminal Function Description (continued)
A functional description of each terminal can be found in the FUNCTIONAL TERMINAL DESCRIPTION section beginning
on page 15.
Terminal
Name
Terminal
Formal Name
Definition
20
CS
Current Sense
Current sense terminal 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 terminals. The LDO current limit can be adjusted
by selecting the proper value of the current sensing resistor RS.
21
22
LDRV
VIN1
Linear Drive
LDO gate drive of the external pass N-channel MOSFET.
Input Voltage 1
The input supply terminal for the integrated circuit. The internal circuits of the IC are
supplied through this terminal.
23
26
27
28
29
30
VDDI
ADDR
EN1
EN2
RT
Power Supply
Address
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is
recommended.
I2C address selection. This terminal can either be left open, tied to VDDI, or
grounded through a 10 kΩ resistor.
Enable 1
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
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.
Reset Timer
This terminal allows programming of the Power-ON Reset delay by means of an
external RC network.
RST
Reset Output
(Active LOW)
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.
31
32
CLKSEL
CLKSYN
Clock Selection
This terminal sets the CLKSYN terminal as either an oscillator output or a
synchronization input terminal. The CLKSEL terminal is also used for the I2C
address selection.
Clock Synchronization
Oscillator output/synchronization input terminal.
34701
Analog Integrated Circuit Device Data
Freescale Semiconductor
4
FREESCALE [ Freescale ]
