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| 型号： | MAX1683EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4 V ~ 11 V |
| 输入电压： | 2 V ~ 5.5 V |
| 频率 - 开关： | 35kHz |
| 电流 - 输出： | 45mA |
| 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： | SC-74A，SOT-753 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-5 |
| 其它名称： | MAX1683EUK+TDKR |
Switched-Capacitor Voltage Doublers
_____________________Pin Description
Efficiency Considerations
The power efficiency of a switched-capacitor voltage
PIN
1
2
3
4
5
NAME
GND
OUT
C1-
IN
C1+
FUNCTION
Ground
Doubled Output Voltage. Connect C2
between OUT and GND.
Negative Terminal of the Flying
Capacitor
Input Supply
Positive Terminal of the Flying
Capacitor
converter is affected by three factors: the internal losses
in the converter IC, the resistive losses of the capacitors,
and the conversion losses during charge transfer
between the capacitors. The total power loss is:
Σ P LOSS = P INTERNAL LOSSES
+ P PUMP CAPACITOR LOSSES
+ P CONVERSION LOSSES
The internal losses are associated with the IC’s internal
functions, such as driving the switches, oscillator, etc.
These losses are affected by operating conditions such
_______________Detailed Description
The MAX1682/MAX1683 capacitive charge pumps
double the voltage applied to their input. Figure 1
shows a simplified functional diagram of an ideal volt-
age doubler. During the first half-cycle, switches S1
and S2 close, and capacitor C1 charges to V IN . During
the second half cycle, S1 and S2 open, S3 and S4
close, and C1 is level shifted upward by V IN volts. This
as input voltage, temperature, and frequency.
The next two losses are associated with the voltage
converter circuit ’s output resistance. Switch losses
occur because of the on-resistance of the MOSFET
switches in the IC. Charge-pump capacitor losses
occur because of their ESR. The relationship between
these losses and the output resistance is as follows:
P PUMP CAPACITOR LOSSES + P SWITCH LOSSES =
connects C1 to the reservoir capacitor C2, allowing
energy to be delivered to the output as necessary. The
I OUT
2
x R OUT
R OUT ?
+ 2 R SWITCHES C 1
+ 4 ESR
( f OSC )
actual voltage is slightly lower than 2 x V IN , since
switches S1–S4 have resistance and the load drains
charge from C2.
Charge-Pump Output
The MAX1682/MAX1683 have a finite output resistance
of about 20 Ω (Table 2). As the load current increases,
the devices’ output voltage (V OUT ) droops. The droop
equals the current drawn from V OUT times the circuit’s
output impedance (R S ), as follows:
1
x C 1
+ ESR C 2
where f OSC is the oscillator frequency. The first term is
the effective resistance from an ideal switched-
capacitor circuit (Figures 2a and 2b).
f
V DROOP = I OUT x R S
V OUT = 2 x V IN - V DROOP
V+
V OUT
V IN
S1
S3
C1
C2
R L
C1
V OUT
Figure 2a. Switched-Capacitor Model
S2
S4
C2
V+
R EQUIV
1
R EQUIV =
f × C1
C2
R L
V OUT
V IN
Figure 1. Simplified Functional Diagram of Ideal Voltage
Doubler
Figure 2b. Equivalent Circuit
_______________________________________________________________________________________
5
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