參數(shù)資料
型號(hào)： MAX624
廠商： Maxim Integrated Products, Inc.
英文描述： Dual-Output, 1MHz DC-DC Boost Converter for PCMCIA Applications(升壓型，輸出電壓5V/12V/可調(diào),輸出電流200mA的DC-DC變換器)
中文描述： 雙輸出，1MHz的DC - DC升壓轉(zhuǎn)換器應(yīng)用為PCMCIA（升壓型，輸出電壓5V/12V /可調(diào)，輸出電流200毫安的直流變換器）
文件頁(yè)數(shù)： 7/16頁(yè)
文件大?。?/td> 215K
代理商： MAX624
M
Dual-Output, 1MHz DC-DC Boost Converter
for PCMCIA Applic ations
_______________________________________________________________________________________
7
______________________________________________________________Pin Desc ription
NAME
FUNCTION
1
EXT
Gate-Drive Output. Drives inrush surge-current limiting MOSFET. EXT is fed by an internal charge-pump tripler
that swings from GND to V
IN
x 3.
2
RESET
Power-On Reset Output. Low when V
IN
< 2.8V and for 4ms after V
IN
> 2.8V. EXT is low when RESET is low.
Swings from GND to V
IN
.
PIN
3
REF
2V Reference Output. Bypass to GND with 0.1μF. No external load current is allowed.
4
GND
Quiet Analog Ground and Low-Side Current-Sense Input for Auxiliary SMPS
8
SSA
Soft-Start Input for Auxiliary SMPS. An external soft-start capacitor varies the auxiliary SMPS start-up time. Ramp
time to full current limit is approximately 50μs per nF of soft-start capacitance.
7
SS5
Soft-Start Input for 5V Main SMPS. An external soft-start capacitor varies the 5V start-up time. Ramp time to full
current limit is approximately 50μs per nF of soft-start capacitance.
6
ONA
On/Off Control Input for Auxiliary SMPS, low = off
5
SHDN
Shutdown. Disables both SMPSs when low. In shutdown, the surge-protection input MOSFET is kept on.
13
FB5
Feedback Input for 5V Main SMPS. FB5 also serves as the supply voltage rail for much of the internal circuitry
for both SMPSs (bootstrap supply input).
12
DA
Gate-Drive Output for Auxiliary SMPS. Swings 0V to FB5.
11
CSA
Current-Sense Input for Auxiliary SMPS. Current-limit threshold is 200mV nominal with respect to GND.
10
VA
Output Voltage Sense Input for Auxiliary SMPS. The only purpose of this pin is to set the SMPS timing algorithm.
Internally, VA connects to the top of a 250k
±30% resistor that connects to V
IN
.
9
FBA
Feedback Input for Auxiliary SMPS. Regulates around REF (2V nominal). FBA is a high-impedance CMOS input.
16
VIN
Input Supply Voltage from the External Supply. Normal operating range is 3V to 5.5V.
15
LX5
Drain Connection for 5V Main SMPS Power MOSFET
14
PGND
Power Ground, source connection for the main 5V SMPS power MOSFET
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