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| 型号： | TC682CPA |
| 厂商： | Microchip Technology |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL INV 8DIP |
| 标准包装： | 60 |
| 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： | -4.8 V ~ -11 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| 频率 - 开关： | 12kHz |
| 电流 - 输出： | 10mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
TC682
3.0
DETAILED DESCRIPTION
+5V
V IN
(+5V)
6
V OUT 4
C 1
C 2
+
–
+
–
7
1
2
3
V IN
C 1 +
C 1 –
TC682
C 2 +
C 2 –
V– OUT
+
–
SW1
C 1
SW2
SW3
+
C 2
–
SW4
-10V
–
+
C 3
V OUT
GND
5
–
+
C OUT
R L
FIGURE 3-3:
Charge Pump – Phase 2
GND
All Caps = 3.3 μ F
3.3
Maximum Operating Limits
FIGURE 3-1:
TC682 Test Circuit
The TC682 has on-chip Zener diodes that clamp V IN
3.1
Phase 1
to approximately 5.8V, and V OUT to -11.6V. Never
exceed the maximum supply voltage or excessive
V SS charge storage – before this phase of the clock
cycle, capacitor C 1 is already charged to +5V. C 1+ is
then switched to ground and the charge in C 1– is
transferred to C 2– . Since C 2+ is at +5V, the voltage
current will be shunted by these diodes, potentially
damaging the chip. The TC682 will operate over the
entire operating temperature range with an input
voltage of 2V to 5.5V.
potential across capacitor C 2 is now -10V.
3.4
Efficiency Considerations
V IN = +5V
Theoretically a charge pump voltage multiplier can
approach 100% efficiency under the following
conditions:
? The charge pump switches have virtually no offset
+
–
SW1
C 1
SW2
+
–
SW3
C 2
SW4
–
+
C 3
V OUT
and are extremely low on resistance.
? Minimal power is consumed by the drive circuitry.
? The impedances of the reservoir and pump
capacitors are negligible.
-5V
For the TC682, efficiency is as shown below:
Voltage Efficiency = V OUT / (-2V IN )
FIGURE 3-2:
Charge Pump – Phase 1
V OUT = -2V IN + V DROP
V DROP = (I OUT ) (R OUT )
3.2
Phase 2
Power Loss
= I OUT (V DROP )
V SS transfer – phase two of the clock connects the neg-
ative terminal of C 2 to the negative side of reservoir
capacitor C 3 and the positive terminal of C 2 to ground,
transferring the generated -10V to C 3 . Simultaneously,
the positive side of capacitor C 1 is switched to +5V and
the negative side is connected to ground. C 2 is then
switched to V CC and GND and Phase 1 begins again.
DS21453C-page 4
There will be a substantial voltage difference between
V OUT and -2V IN if the impedances of the pump capaci-
tors C 1 and C 2 are high with respect to their respective
output loads.
Larger values of reservoir capacitor C 3 will reduce
output ripple. Larger values of both pump and reservoir
“Capacitor Selection” “Capacitor Selection”.
? 2006 Microchip Technology Inc.
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