參數(shù)資料
型號(hào)： MC34701R2
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： 1.5 A Switch-Mode Power Supply with Linear Regulator
中文描述： 1.5開關(guān)模式電源，線性穩(wěn)壓器
文件頁數(shù)： 4/38頁
文件大?。?/td> 739K
代理商： MC34701R2
Analog Integrated Circuit Device Data
Freescale Semiconductor
4
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
I
2
C address selection. This terminal can either be left open, tied to VDDI, or
grounded through a 10 k
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 I
2
C
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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