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TCM680EOA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TCM680EOA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 7 page 4-15 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TCM680 +5V TO ±10V VOLTAGE CONVERTER Figure 4. Charge Pump – Phase 3 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. 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 3. Charge Pump – Phase 2 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 C 2 + is connected to +5V, the voltage potential across capacitor C2 is now 10V. Phase 4 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. 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 V IN = +5V V SS V DD –5V SW4 SW1 SW2 SW3 C 2 C 4 C 3 C 1 + – + + – – + – +5V V SS V DD –10V SW4 SW2 SW1 SW3 C 2 C 3 C 1 + – + + – – C 4 + – V IN = +5V V SS V DD –5V SW4 SW1 SW2 SW3 C 2 C 4 C 3 C 1 + – + + – – + – Figure 5. Charge Pump – Phase 4 +5V V SS V DD –10V SW4 SW2 SW1 SW3 C 2 C 3 C 1 + – + + – – C 4 + – MAXIMUM OPERATING LIMITS The TCM680 has on-chip zener diodes that clamp VIN to 5.8V, V + OUT to 11.6V, and V – OUT to –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. |
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