TC660 TELCOM [TelCom Semiconductor, Inc], TC660 Datasheet
TC660
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TC660 Summary of contents
Page 1
... Operation using input voltage between 1.5V and 3.0V is accommodated by grounding the LV input (pin 6). Operation at higher input voltages (3.0V to 5.5V) is accom- plished by leaving LV open. The TC660 open circuit output voltage is within 0.1% of the input voltage with the output open-circuited. Power conversion efficiency is 98% when output load is between 2mA and 5mA. ...
Page 2
... OUT FF NOTES: 1. Connecting any input terminal to voltages greater than V inputs from sources operating from external supplies be applied prior to "power up" of the TC660. 2. Derate linearly above 5.5 mW prevent damaging the device, do not short maximize output voltage and efficiency performance, use low ESR capacitors for C ...
Page 3
... OSCILLATOR FREQUENCY (kHz) Output Source Resistance 8) vs. Temperature 1.5VDC 3VDC 5VDC 4 -40 - 100 TEMPERATURE ( C) TC660 = +25 C, unless A 3) Efficiency vs. Load Current 100 100 LOAD CURRENT (mA) Efficiency vs ...
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... CHARGE PUMP DC-TO-DC 11) Oscillator Frequency vs. Temperature FC= OPEN, OSC = OPEN 2 0 -40 - 100 TEMPERATURE ( C) 14) TC7660 and TC660 Output Voltage and Power Efficiency + = vs. Load Current -3.0 TC7660 -3.4 TC660 EFF -3.8 V OUT -4.2 TC660 -4.6 TC7660 -5 100 2.0 LOAD CURRENT (mA) Description Internal Oscillator frequency control ...
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... OUT and the substrate bias adjusted accordingly. Failure to accomplish this would result in high power losses and possible device latch-up. This problem is eliminated in the TC660 by a logic network which senses the output voltage (V ) together with the level translators, and switches the OUT ...
Page 6
... The output characteristics of the circuit in Figure 3 are those of a nearly ideal voltage source in series with 6.5 . Thus, for a load current of –100mA and a supply voltage of +5V, the output voltage would be – 4.35V. The dynamic output impedance of the TC660 is due, primarily, to capacitive reactance of the charge transfer + in inverting mode ...
Page 7
... Output transitions occur on the positive-going edge of the clock also possible to increase the conversion efficiency of the TC660 at low load levels by lowering the oscillator frequency. This reduces the switching losses, and is achieved by connecting an additional capacitor, C Figure 7. Lowering the oscillator frequency will cause an ...
Page 8
... TC660 Figure 8. Positive Voltage Doubler Figure 9 shows an improved way of using the TC660 as a voltage doubler. In this circuit first charged to V brought to within a diode drop reversal) through D. The optional 200 limit the brief latchup current. On the next half-cycle series with C1 ...