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參數(shù)資料
| 型號： | MAX1595EUA50 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MO187C-AA, MICRO MAX PACKAGE-8 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 350K |
| 代理商： | MAX1595EUA50 |
M
Regulated 3.3V/5.0V Step-Up/Step-Down
Charge Pump
_______________________________________________________________________________________
5
exceeds the available battery voltage, the use of a
charge pump such as the MAX1595 provides high effi-
ciency, small size, and constant light output with chang-
ing battery voltages. If the output is used only to light
LEDs, the output capacitor can be greatly reduced. The
frequency modulation of the LED intensity is not dis-
cernible to the human eye, and the smaller capacitor
saves both size and cost.
Adding two Schottky diodes and two capacitors imple-
ments a tripler and allows the MAX1595_ _ _50 to regu-
late a current of 75mA with a supply voltage as low as
2.3V (Figure 3).
Capacitor Selection
The MAX1595 requires only three external capacitors
(Figure 4). Their values are closely linked to the output
current capacity, oscillator frequency, output noise con-
tent, and mode of operation.
Generally, the transfer capacitor (C
X
) will be the smallest,
and the input capacitor (C
IN
) is twice as large as C
X
.
Higher switching frequencies allow the use of the smaller
C
X
and C
IN
. The output capacitor (C
OUT
) can be any-
where from 5-times to 50-times larger than C
X
. Table 1
shows recommended capacitor values.
In addition, the following equation approximates output
ripple:
V
RIPPLE
I
OUT
/ (2 x f
OSC
x C
OUT
)
Table 2 lists the manufacturers of recommended capaci-
tors. Ceramic capacitors will provide the lowest ripple
due to their typically lower ESR.
Power Dissipation
The power dissipated in the MAX1595 depends on out-
put current and is accurately described by:
P
DISS
= I
OUT
(2V
IN
- V
OUT
)
P
DISS
must be less than that allowed by the package
rating.
Layout Considerations
All capacitors should be soldered in close proximity to
the IC. Connect ground and power ground through a
short, low-impedance trace. The input supply trace
should be as short as possible. Otherwise, an additional
input supply filter capacitor (tantalum or electrolytic) may
be required.
AOUT
IN
INPUT
2.3V
1
μ
F
SHDN
GND
PGND
OUT
MAX1595_ _ _50
0.22
μ
F
CXP
CXN
1
μ
F
OUTPUT
REGULATED 5V
75mA
1
μ
F
0.22
μ
F
OUT
IN
V
IN
C
OUT
=
0.47
μ
F
C
IN
= 1
μ
F
C
X
= 0.1
μ
F
SHDN
GND
CXP
CXN
PGND
AOUT
MAX1595_ _ _50
100
100
100
Figure 3. Regulated Voltage Tripler
Figure 2. White LED Bias Supply
C
X
0.22
μ
F
C
IN
1
μ
F
C
OUT
1
μ
F
OUT
CXN
CXP
SHDN
IN
OUT
7
4
6
3
2
8
ON
OFF
GND
5
PGND
AOUT
1
MAX1595
IN
Figure 4. Standard Operating Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1595EUA50+ | 功能描述:電荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1595EUA50+T | 功能描述:電荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1595EUA50-T | 功能描述:電荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1598EZK25+T | 功能描述:低壓差穩(wěn)壓器 - LDO Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX1598EZK25-T | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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