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參數(shù)資料
| 型號(hào)： | MAX619 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3-V ABT Octal Buffers/Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| 中文描述： | 穩(wěn)壓型、5V電荷泵DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 66K |
| 代理商： | MAX619 |
M
Regulated 5V Charge-Pump
DC-DC Converter
6
________________________________________________________________________________________
Table 1. Capacitor Suppliers
* Note:
(SM) denotes surface-mount component, (TH) denotes through-hole component.
__________Applic ations Information
Capac itor S elec tion
Charge-Pump Capacitors C1 and C2
The values of charge-pump capacitors C1 and C2 are
critical to ensure adequate output current and avoid
excessive peak currents. Use values in the range of
0.22
μ
F to 1.0
μ
F. Larger capacitors (up to 50
μ
F) can
be used, but larger capacitors will increase output rip-
ple. Ceramic or tantalum capacitors are recommend-
ed.
Input and Output Capacitors, C3 and C4
The type of input bypass capacitor (C3) and output fil-
ter capacitor (C4) used is not critical, but it does affect
performance. Tantalums, ceramics, or aluminum elec-
trolytics are suggested. For smallest size, use Sprague
595D106X0010A2 surface-mount capacitors, which
measure 3.7mm x 1.8mm (0.146in x 0.072in). For low-
est ripple, use large, low effective-series-resistance
(ESR) ceramic or tantalum capacitors. For lowest cost,
use aluminum electrolytic or tantalum capacitors.
Figure 2 shows the component values for proper oper-
ation using minimal board space. The input bypass
capacitor (C3) and output filter capacitor (C4) should
both be at least 10
μ
F when using aluminum electrolyt-
ics or Sprague’s miniature 595D series of tantalum chip
capacitors.
When using ceramic capacitors, the values of C3 and
C4 can be reduced to 2
μ
F and 1
μ
F, respectively. If the
input supply source impedance is very low, C3 may not
be necessary.
Many capacitors exhibit 40% to 50% variation over
temperature. Compensate for capacitor temperature
coefficient by selecting a larger nominal value to
ensure proper operation over temperature. Table 1 lists
capacitor suppliers.
MAX619
C4
10μF
IN
C1+
C1–
OUT
SHDN
C2+
C2–
GND
7
4
5
6
2
1
8
3
C3
10μF
2
CELLS
C1
0.22μF
C2
0.22μF
5V ±4%
@ 20mA
Figure 2. Two-Cell to 5V Application Circuit
10
μ
F tantalum (SM)
595D106X0010A2
(603) 224-1430
(207) 324-7223
(603) 224-1961
(207) 327-4140
Sprague Electric
(smallest size)
0.1
μ
F ceramic (TH)
RPE121Z5U104M50V
(814) 238-0490
(814) 237-1431
Murata Erie
1.0
μ
F ceramic (TH)
RPI123Z5U105M50V
0.22
μ
F ceramic (SM)
GRM42-6Z5U22M50
0.1
μ
F ceramic (SM)
GRM42-6Z5U10M50
CAPACITOR TYPE*
CAPACITOR
FAX NUMBER
PHONE NUMBER
SUPPLIER
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6190 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Precision, Micropower, Low-Dropout Voltage References |
| MAX6190A | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Precision, Micropower, Low-Dropout Voltage References |
| MAX6190AESA | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Precision uPower 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 |
| MAX6190AESA+ | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Precision uPower 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 |
| MAX6190AESA+T | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Precision uPower 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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