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MC34701EK Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc

Part No. MC34701EK
Description  1.5 A Switch-Mode Power Supply with Linear Regulator
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34701EK Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
4
Freescale Semiconductor
34701
TERMINAL CONNECTIONS
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
LDRV
Linear Drive
LDO gate drive of the external pass N-channel MOSFET.
22
VIN1
Input Voltage 1
The input supply terminal for the integrated circuit. The internal circuits of the IC are
supplied through this terminal.
23
VDDI
Power Supply
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is
recommended.
26
ADDR
Address
I2C address selection. This terminal can either be left open, tied to VDDI, or
grounded through a 10 k
Ω resistor.
27
EN1
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.
28
EN2
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.
29
RT
Reset Timer
This terminal allows programming of the Power-ON Reset delay by means of an
external RC network.
30
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
CLKSEL
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.
32
CLKSYN
Clock Synchronization
Oscillator output/synchronization input terminal.
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
Terminal
Name
Formal Name
Definition


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