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参数资料
| 型号： | TC682COA |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 9/14页 |
| 文件大小： | 534K |
| 代理商： | TC682COA |
TC682
DS21453C-page 4
2006 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
FIGURE 3-1:
TC682 Test Circuit
3.1
Phase 1
VSS charge storage – before this phase of the clock
cycle, capacitor C1 is already charged to +5V. C1
+ is
then switched to ground and the charge in C1
– is
transferred to C2
–. Since C
2
+ is at +5V, the voltage
potential across capacitor C2 is now -10V.
FIGURE 3-2:
Charge Pump – Phase 1
3.2
Phase 2
VSS transfer – phase two of the clock connects the neg-
ative terminal of C2 to the negative side of reservoir
capacitor C3 and the positive terminal of C2 to ground,
transferring the generated -10V to C3. Simultaneously,
the positive side of capacitor C1 is switched to +5V and
the negative side is connected to ground. C2 is then
switched to VCC and GND and Phase 1 begins again.
FIGURE 3-3:
Charge Pump – Phase 2
3.3
Maximum Operating Limits
The TC682 has on-chip Zener diodes that clamp VIN
to approximately 5.8V, and VOUT to -11.6V. Never
exceed the maximum supply voltage or excessive
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.
3.4
Efficiency Considerations
Theoretically a charge pump voltage multiplier can
approach
100%
efficiency
under
the
following
conditions:
The charge pump switches have virtually no offset
and are extremely low on resistance.
Minimal power is consumed by the drive circuitry.
The impedances of the reservoir and pump
capacitors are negligible.
For the TC682, efficiency is as shown below:
Voltage Efficiency = VOUT / (-2VIN)
VOUT = -2VIN + VDROP
VDROP = (IOUT) (ROUT)
Power Loss
= IOUT (VDROP)
There will be a substantial voltage difference between
VOUT and -2VIN if the impedances of the pump capaci-
tors C1 and C2 are high with respect to their respective
output loads.
Larger values of reservoir capacitor C3 will reduce
output ripple. Larger values of both pump and reservoir
capacitors improve the efficiency. See Section 4.2
“Capacitor Selection” “Capacitor Selection”.
(+5V)
6
7
1
2
3
5
4
RL
GND
+
–
+
–
+
GND
VIN
All Caps = 3.3
μF
TC682
VOUT
C1+
VIN
C2+
C1–
C2–
COUT
V–OUT
C1
C2
–
VIN = +5V
VOUT
-5V
SW4
SW1
SW2
SW3
C2
C3
C1
+
–
+
–
+5V
VOUT
-10V
SW4
SW2
SW1
SW3
C2
C3
C1
+
–
+
–
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC682COA713 | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682CPA | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EOA | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EOA713 | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EPA | 功能描述:电荷泵 Inverting V Doubler 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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