The switching frequency of the MAX5070A/MAX5070B is externally programmable from 20kHz to 1MHz, while the timing-capacitor discharge current is trimmed to ±5%. This allows the maximum duty cycle to be accurately set, thereby avoiding transformer saturation. The maximum duty cycle for MAX5070A and MAX5070B is 100% and 50%, respectively. In addition, the switching frequency is trimmed for ±7% accuracy while the current-limit threshold and start/stop voltages are trimmed for ±5% accuracy.The devices' fast 60ns cycle-by-cycle current-limit propagation delay allows a fast response to output short circuit. Startup current is typically 35µA, which allows the use of high-value startup resistors, thus reducing power dissipation in the startup resistor in standby mode. The size of the startup capacitor is also reduced. The MAX5070A/MAX5070B gate-driver outputs are capable of sourcing 2A and sinking 1A. Both devices include overtemperature shutdown.
Rated for operation over a wide -40°C to +125°C temperature range, the MAX5070A and MAX5070B are available in 8-pin SO and 8-pin µMAX® packages. Prices start at $0.61 (1000-up, FOB USA).
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