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CAT3200 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT3200 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 12 page CAT3200/3200-5 6 Doc. No. MD-5002, Rev. L © Catalyst Semiconductor, Inc. Characteristics subject to change without notice resistor network (400k Ω). The feedback network will result in a reverse current of 10 µA to 20µA to flow back through the device to ground. Whenever the device is taken out of shutdown mode, the output voltage will experience a slew rate controlled power-up. Full operating voltage is typically achieved in less than 0.5 msec. GND is the ground reference for all voltages on CAT3200- 5 devices. FB (CAT3200 Only) is the feedback input pin. An output divider should be connected from OUT to FB to program the output voltage. PGND (CAT3200 Only). Is the same as GND for the CAT3200-5 except for the internal reference connection to SGND. SGND (CAT3200 Only) Ground pin for the internal reference. The CNEG connection is switched to this pin during the normal charge pump operation. PIN FUNCTIONS IN is the power supply. During normal operation the device draws a supply current which is almost constant. A very brief interval of non-conduction will occur at the switching frequency. The duration of the non-conduction interval is set by the internal non-overlapping “break-before-make” timing. IN should be bypassed with a 1 µF to 4.7µF low ESR (Equivalent Series Resistance) ceramic capacitor. For filtering, a low ESR ceramic bypass capacitor (1 µF) in close proximity to the IN pin prevents noise from being injected back into the power supply. SHDN SHDN SHDN SHDN SHDN is the logic control input (Active LOW) that places the device into shutdown mode. The internal logic is CMOS and the pin does not use an internal pull-down resistor. The SHDN SHDN SHDN SHDN SHDN pin should not be allowed to float. CPOS, CNEG are the positive and negative connections respectively for the charge pump flying capacitor. A low ESR ceramic capacitor (1 µF) should be connected between these pins. During initial power-up it may be possible for the capacitor to experience a voltage reversal and for this reason, avoid using a polarized (tantalum or aluminum) flying capacitor. OUT is the regulated output voltage to power the load. During normal operation, the device will deliver a train of current pulses to the pin at a frequency of 2MHz. Adequate filtering on the pin can typically be achieved through the use a low ESR ceramic bypass capacitor (1 µF to 4.7µF) in close proximity to the OUT pin. The ESR of the output capacitor will directly influence the output ripple voltage. When the shutdown mode is entered, the output is immediately isolated from the input supply, however, the output will remain connected to the internal feedback CAT3200 Adjustable Output CAT3200-5 5V Fixed Output BLOCK DIAGRAM + — EN 2MHz Voltage Doubler 1.25V SGND SHDN IN CNEG CPOS 2VIN 5V/100mA OUT PGND FB + — EN 2MHz Voltage Doubler 300k 100k 1.25V GND SHDN IN CNEG CPOS 2VIN 5V 100mA OUT |
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Similar Description - CAT3200 |
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