The LTC7820EUFD#PBF is a fixed ratio high voltage high power switched capacitor/charge pump controller. The device includes four N-channel MOSFET gate drivers to drive external power MOSFETs in voltage divider, doubler or inverter configurations. The device achieves a 2:1 step-down ratio from an input voltage as high as 72V, a 1:2 step-up ratio from an input voltage as high as 36V, or a 1:1 inverting ratio from an input voltage up to 36V. Each power MOSFET is switched with 50% duty cycle at a constant pre-programmed switching frequency. System efficiency can be optimized to over 99%. The LTC7820EUFD#PBF provides a small and cost effective solution for high power, non-isolated intermediate bus applications with fault protection.
The LTC7820EUFD#PBF switching frequency can be linearly programmed from 100 kHz to 1MHz. The device is available in a thermally enhanced 28-lead QFN package with some no-connect pins for high voltage compatible pin spacing.
Feature
- Low Profile, High Power Density, Capable of 500W+
- Soft Switching: 99% Peak Efficiency and Low EMI
- VIN Max for Voltage Divider (2:1): 72V
- VIN Max for Voltage Doubler (1:2)/Inverter (1:1): 36V
- Wide Bias VCC Range: 6V to 72V
- Soft Startup into Steady State Operation
- 6.5V to 40V EXTVCC Input for Improved Efficiency
- Input Current Sensing and Overcurrent Protection
- Wide Operating Frequency Range: 100kHz to 1MHz
- Output Short-Circuit/OV/UV Protections with Programmable Timer and Retry
- Thermally Enhanced 28-Pin 4mm × 5mm QFN Package
Applications
- Bus Converters
- High Power Distributed Power Systems
- Communications Systems
- Industrial Applications
