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| 型号： | MAX868EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），倍增器，反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -3.6 V ~ -11 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 频率 - 开关： | 270kHz ~ 630kHz |
| 电流 - 输出： | 30mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-µMAX |
Regulated, Adjustable -2x
Inverting Charge Pump
(a)
(a)
C2+
IN
C2+
IN
C2-
C2-
C1+
C1+
V OUT
C1-
V OUT
C OUT
C1-
C OUT
(b)
C2+
C2-
(b)
IN
C1+
C2+
V OUT
C OUT
C1+
C1-
V OUT
GND
C1-
C2-
C OUT
Figure 2. a) In charge phase, the left-hand switches are
closed and the right-hand switches are open, charging the fly-
ing capacitors (C1 and C2) while the output capacitor (C OUT )
services the load. b) The equivalent circuit of the charge phase
of operation.
__________________Design Procedure
Setting the Output Voltage
Set the output voltage using two external resistors, R1
and R2, as shown in Figure 4. Since the input bias cur-
rent at FB has a 50nA maximum, large resistor values in
the feedback loop do not significantly degrade accura-
cy. Begin by selecting R2 in the 100k ? to 500k ? range,
and calculate R1 using the following equation:
Figure 3. a) In discharge phase, the left-hand switches are
open and the right-hand switches are closed, transferring
energy from the flying capacitors (C1 and C2) to the output
capacitor (C OUT ). b) The equivalent circuit of the discharge
phase of operation.
When the MAX868 is powered by an unregulated sup-
ply, such as when operating directly from a battery, use
any available positive reference voltage in the system.
Note that due to the MAX868’s doubling and inverting
charge-pump action, the output voltage is limited to
-2 x V IN .
Alternatively, to configure the MAX868 as a simple,
unregulated doubler-inverter (V OUT = -2 x V IN ), con-
nect FB to IN. In this configuration, the MAX868 runs at
R 1 = R 2 x
| V OUT |
V REF
its maximum oscillator frequency, operating as a con-
ventional, open-loop charge pump.
If multiple oscillator cycles are required to regulate the
where V OUT is the desired output voltage, and V REF is
any available regulated positive voltage. When the
MAX868 is powered by a regulated voltage, V IN can be
used as the reference for setting the output voltage.
output, reduce the values for R1 and R2, or parallel a
small capacitor (C C ) across R1 to compensate the
feedback loop and ensure stability. Choose the lowest
capacitor value that ensures stability; values up to 47pF
are adequate for most applications.
6
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