CAT660EVA-GT3 ON Semiconductor

CAT660 100 mA CMOS Charge Pump Inverter/Doubler Description The CAT660 is a chargepump voltage converter. It will invert a 1.5 V to 5.5 V input to a 1.5 V to 5.5 V output. Only two external CAT660 Typical Application +V IN Doubled 1.5 V to 5.5 V Positive 1 8 1 8 Voltage BOOST/FC BOOST/FC V+ V+ 1 F to Output 2 7 C2 2 7 150 F Inverted CAP+ OSC + CAP+ OSC 1 F to Negative C1 + CAT660 C1 CAT660 6 3 6 3 150 F Voltage LV GND LV GND Output V = 2.5 V 1 F to 5 4 5 4 IN CAP CAP OUT OUT to 5.5 V 150 F 1 F to C2 150 F Figure 1. Voltage Inverter Figure 2. Positive Voltage Doubler Table 1. PIN DESCRIPTIONS Circuit Configuration Pin Number Name Inverter Mode Doubler Mode 1 Boost/FC Frequency Control for the internal oscillator. With an external Same as inverter. oscillator BOOST/FC has no effect. Boost/FC Oscillator Frequency Open 10 kHz typical, 5 kHz minimum V+ 80 kHz typical, 40 kHz minimum 2 CAP+ Charge pump capacitor. Positive terminal. Same as inverter. 3 GND Power supply ground. Power supply. Positive voltage input. 4 CAP Charge pump capacitor. Negative terminal. Same as inverter. 5 OUT Output for negative voltage. Power supply ground. 6 LV Low Voltage selection pin. When the input voltage is less LV must be tied to OUT for all input than 3 V, connect LV to GND. For input voltages above 3 V, voltages. LV may be connected to GND or left open. If OSC is driven externally, connect LV to GND. 7 OSC Oscillator control input. An external capacitor can be connec- Same as inverter. Do not overdrive OSC ted to lower the oscillator frequency. An external oscillator in doubling mode. Standard logic levels can drive OSC and set the chip operating frequency. The will not be suitable. See the applications chargepump frequency is onehalf the frequency at OSC. section for additional information. 8 V+ Power supply. Positive voltage input. Positive voltage output.