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参数资料
| 型号： | MAX1595ETC33+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 3.3V 12TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 降压（降压），升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 125mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
Regulated 3.3V/5.0V Step-Up/Step-Down
Charge Pump
Applications Information
Using white LEDs to backlight LCDs is an increasingly
popular approach for portable information devices
C X = 0.1 μ F
(Figure 2). Because the forward voltage of white LEDs
exceeds the available battery voltage, the use of a
CXP
CXN
charge pump such as the MAX1595 provides high effi-
MAX1595_ _ _50
ciency, small size, and constant light output with chang-
V IN
IN
OUT
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-
C IN = 1 μ F
SHDN
AOUT
C OUT =
0.47 μ F
100 ?
100 ?
100 ?
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,
PGND GND
Figure 2. White LED Bias Supply
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:
INPUT
2.3V
1 μ F
IN AOUT
SHDN OUT
MAX1595_ _ _50
CXP
CXN
PGND GND
1 μ F
0.22 μ F
0.22 μ F
OUTPUT
REGULATED 5V
1 μ F 75mA
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:
Figure 3. Regulated Voltage Tripler
P DISS = I OUT (2V IN - V OUT )
P DISS must be less than that allowed by the package
rating.
OFF
IN
ON
2
3
SHDN
IN
MAX1595
CXP
CXN
OUT
7
6
8
C X
0.22 μ F
OUT
Layout Considerations
All capacitors should be soldered in close proximity to
the IC. Connect ground and power ground through a
C IN
1 μ F
PGND
5
GND
4
AOUT
1
C OUT
1 μ F
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.
Figure 4. Standard Operating Circuit
_______________________________________________________________________________________
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1595ETC33+ | 功能描述:电荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1595ETC33+T | 功能描述:电荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1595ETC33-T | 功能描述:电荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1595ETC50 | 功能描述:电荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1595ETC50+ | 功能描述:电荷泵 Regulated 3.3/5.0V Step-Up/Step-Down RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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