TCM680CPA データシートの表示（PDF） - TelCom Semiconductor Inc => Microchip
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TCM680CPA Datasheet PDF : 7 Pages
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+5V TO ±10V VOLTAGE CONVERTER
1
TCM680
DETAILED DESCRIPTION
Phase 1
VSS charge storage – The positive side of capacitors C1
and C2 are connected to +5V at the start of this phase. C1+ is
then switched to ground and the charge in C1– is transferred
to C2–. Since C2+ is connected to +5V, the voltage potential
across capacitor C2 is now 10V.
SW1
+
– C1
SW2
SW3
+
– C2
SW4
VIN = +5V
–
C4
+
VDD
VSS
–
+ C3
–5V
SW1
+
– C1
SW2
SW3
+
– C2
SW4
VIN = +5V
–
C4
+
VDD
VSS
–
+ C3
2
–5V
3
Phase 4
Figure 4. Charge Pump – Phase 3
VDD transfer – The fourth phase of the clock connects
the negative terminal of C2 to ground, and transfers the
generated 10V across C2 to C4, the VDD storage capacitor.
4 Again, simultaneously with this, the positive side of capaci-
tor C1 is switched to +5V and the negative side is connected
to ground, and the cycle begins again.
Figure 2. Charge Pump – Phase 1
Phase 2
VSS transfer – Phase two of the clock connects the
negative terminal of C2 to the VSS storage capacitor C3 and
the positive terminal of C2 to ground, transferring the gener-
ated –10V to C3. Simultaneously, the positive side of capaci-
tor C1 is switched to +5V and the negative side is connected
to ground.
+5V
SW1
SW3
–
+
C4
VDD
+
– C1
+
– C2
VSS
–
5
SW2 SW4
+ C3
–10V
SW1
+
– C1
SW2
+5V
SW3
+
– C2
SW4
–10V
–
+
C4
VDD
VSS
–
+ C3
Figure 3. Charge Pump – Phase 2
Phase 3
VDD charge storage – The third phase of the clock is
identical to the first phase – the charge transferred in C1
produces –5V in the negative terminal of C1, which is applied
to the negative side of capacitor C2. Since C2+ is at +5V, the
voltage potential across C2 is 10V.
Figure 5. Charge Pump – Phase 4
MAXIMUM OPERATING LIMITS
6
to
The TCM680 has on-chip zener
5.8V, V+OUT
to
11.6V,
and
V
–
OUT
to
diodes that clamp VIN
–11.6V. Never exceed
the maximum supply voltage or excessive current will be
shunted by these diodes, potentially damaging the chip. The
TCM680 will operate over the entire operating temperature
range with an input voltage of 2V to 5.5V.
7
8
TELCOM SEMICONDUCTOR, INC.
4-15
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