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| 型号： | MAX871EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC VOLT INVERT SW CAP SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | 充电泵，LCD |
| 输入电压： | 1.4 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | -1.4 V ~ -5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | MAX871EUK+TDKR |
Switched-Capacitor Voltage Inverters
Flying Capacitor (C1)
Increasing the flying capacitor’s size reduces the output
resistance. Small C1 values increase the output resis-
tance. Above a certain point, increasing C1’s capaci-
tance has a negligible effect, because the output
resistance becomes dominated by the internal switch
resistance and capacitor ESR.
Output Capacitor (C2)
Increasing the output capacitor’s size reduces the output
ripple voltage. Decreasing its ESR reduces both output
resistance and ripple. Smaller capacitance values can
be used with light loads if higher output ripple can be
tolerated. Use the following equation to calculate the
peak-to-peak ripple:
Therefore, use a large bypass capacitor (e.g., equal to
the value of C1) if the supply has a high AC impedance.
When the inverter is loaded from IN to OUT, the circuit
draws 2 x I OUT constantly, except for short switching
spikes. A 0.1μF bypass capacitor is sufficient.
Voltage Inverter
The most common application for these devices is a
charge-pump voltage inverter (Figure 1). This application
requires only two external components—capacitors C1
and C2—plus a bypass capacitor, if necessary. Refer to
the Capacitor Selection section for suggested capacitor
types.
Cascading Devices
V RIPPLE =
I OUT
f OSC x C2
+ 2 x I OUT x ESR C 2
Two devices can be cascaded to produce an even
larger negative voltage (Figure 4). The unloaded output
voltage is normally -2 x V IN , but this is reduced slightly
by the output resistance of the first device multiplied by
Input Bypass Capacitor
Bypass the incoming supply to reduce its AC impedance
and the impact of the MAX870/MAX871 ’s switching
noise. The recommended bypassing depends on the cir-
cuit configuration and on where the load is connected.
When the inverter is loaded from OUT to GND, current
from the supply switches between 2 x I OUT and zero.
Table 1. Low-ESR Capacitor Manufacturers
the quiescent current of the second. When cascading
more than two devices, the output resistance rises dra-
matically. For applications requiring larger negative
voltages, see the MAX864 and MAX865 data sheets.
The maximum load current and startup current of the
nth cascaded circuit must not exceed the maximum
output current capability of the (n-1)th circuit to ensure
proper stability.
PRODUCTION
METHOD
Surface-Mount
Tantalum
Surface-Mount
Ceramic
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
SERIES
TPS series
267 series
593D, 595D series
X7R
X7R
PHONE
(803) 946-0690
(714) 969-2491
(603) 224-1961
(803) 946-0690
(714) 969-2491
FAX
(803) 626-3123
(714) 960-6492
(603) 224-1430
(803) 626-3123
(714) 960-6492
Table 2. Capacitor Selection for Minimum Output Resistance or Capacitor Size
PART
MAX870
MAX871
f OSC
125kHz
500kHz
CAPACITORS TO MINIMIZE
OUTPUT RESISTANCE
(R O = 23 ? , TYP)
C1 = C2
1μF
0.33μF
CAPACITORS TO MINIMIZE SIZE
(R O = 40 ? , TYP)
C1 = C2
0.33μF
0.1μF
6
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相关代理商/技术参数 |
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| MAX8720EEI+T | 功能描述:DC/DC 开关控制器 Dyn Adj 6-Bit VID Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8720EEI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8720ETX | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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