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MC34702EK Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc

No. de pieza MC34702EK
Descripción Electrónicos  3.0 A Switch-Mode Power Supply with Linear Regulator
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34702EK Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
4
Freescale Semiconductor
34702
PIN CONNECTIONS
20
CS
Current Sense
Current sense pin of the LDO. Overcurrent protection of the linear regulator external
power MOSFET. The voltage drop over the LDO current sense resistor R
S 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 R
S.
21
LDRV
Linear Drive
LDO gate drive of the external pass N-channel MOSFET.
22
VIN1
Input Voltage 1
The input supply pin for the integrated circuit. The internal circuits of the IC are
supplied through this pin.
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 pin can either be left open, tied to V
DDI, 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 pin 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 pin sets the CLKSYN pin as either an oscillator output or a synchronization input
pin. The CLKSEL pin is also used for the I2C address selection.
32
CLKSYN
Clock Synchronization
Oscillator output/synchronization input pin.
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
Pin Name
Formal Name
Definition


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