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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 215K |
| 代理商： | MAX624 |
M
________________Applic ation Circ uits
Positive 30V Auxiliary Output Circ uits
The MAX624 can be used to generate a 30V output at
25mA (Figures 9 and 10). Note that the 12V zener clamp
shown in Figure 10 must be used for 5V input applica-
tions. A 30V output at 25mA can be generated by tying
the VA pin to the main SMPS output, but this circuit does
not make optimal use of the inductor (the off-time is
about 0.5μs). An alternative approach is to clamp the VA
output to 12V using a zener. The off-time is optimized
(reduced), which in turn makes better use of the inductor
and produces a higher output current of about 35mA
(Figure 10). Note that the 12V zener clamp shown in
Figure 10 must be used for 5V input applications.
Negative Output Applic ation Circ uit
The MAX624 can be used to generate a negative 30V
output to power-up LCD supplies (Figure 11). This cir-
cuit is part switching regulator and part charge pump.
The switching regulator boosts the input to a high posi-
tive voltage (30V), while the actual negative voltage is
generated using a charge-pump tap on the switching
node. The negative 30V output has a 5% load-regula-
tion error from 1mA to 20mA. The ratio of R5 and R6
resistors can be used to adjust the LCD contrast.
Dual-Output, 1MHz DC-DC Boost Converter
for PCMCIA Applic ations
14
______________________________________________________________________________________
Figure 7. MAX624 PC Board Layout—Ground Plane
Figure 8. MAX624 PC Board Layout—Solder Side
MAX624
12
LX5
11
DA
AUXILIARY OUTPUT
+30V
25mA
V
3.3V ONLY
C2
L2
L1
D2
C8
C3
0.47
μ
F
10pF
L2: 2.2μH, MURATA-ERIE
LQH3C2R2MO400
C3: 4.7μF, MARCON
THCR30E1H474ZT
D2: MOTOROLA MBR0540
R1
0.22
+5V MAIN OUTPUT
200mA
15
16
FB5
13
ONA
6
VIN
D1
CSA
10VA
9
FBA
R5
500k
R6
36k
EXT
1
3300pF
SS5
7
C7
8
14
4
PGND
GND
SSA
C6
3
REF
ON/OFF
4.7
μ
F
NOTE: USE FOR V
IN
= 3.3V ONLY
NOTE: BOLD LINES DESIGNATE HIGH-CURRENT PATHS
AND SHOULD BE KEPT TOMINIMAL LENGTHS.
Figure 9. Positive 30V (25mA) Auxiliary Output Application
Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6241 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References |
| MAX6241ACPA | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| MAX6241ACPA+ | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 2.5V/+4.096V/5V Voltage Ref RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| MAX6241ACSA | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| MAX6241ACSA+ | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 2.5V/+4.096V/5V Voltage Ref RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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