LTC7820 Series

Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

Catalog

Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

Part	Function	Supplier Device Package	Package / Case	Mounting Type	Number of Outputs	Duty Cycle (Max) [Max]	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Control Features	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Output Type	Output Phases	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Main Purpose	Board Type	Current - Output	Outputs and Type	Outputs and Type	Voltage - Input [Max]	Voltage - Input [Min]	Supplied Contents	Frequency - Switching	Regulator Topology	Utilized IC / Part
Analog Devices LTC7820EUFD#PBF	Step-Down Step-Up	28-QFN (4x5)	28-WFQFN Exposed Pad	Surface Mount	1	50 %	Positive	-40 °C	125 ¯C	Current Limit Enable Frequency Control Power Good Soft Start	Boost Buck	1 MHz	100 kHz	Transistor Driver	2	72 V	6 V
Analog Devices DC2543A																		DC/DC Step Down	Fully Populated	10 A	Non-Isolated	1	60 V	36 V	Board(s)	200 kHz	Buck	LTC7820
Analog Devices LTC7820EUFD#TRPBF	Step-Down Step-Up	28-QFN (4x5)	28-WFQFN Exposed Pad	Surface Mount	1	50 %	Positive	-40 °C	125 ¯C	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Boost Buck	1 MHz	100 kHz	Transistor Driver	2	72 V	6 V

Catalog

Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

Key Features

• Low Profile, High Power Density, Capable of 500W+

• Soft Switching: 99% Peak Efficiency and Low EMI

• VINMax for Voltage Divider (2:1): 72V

• VINMax for Voltage Doubler (1:2)/Inverter (1:1): 36V

• Wide Bias VCCRange: 6V to 72V

• Soft Startup into Steady State Operation

• 6.5V to 40V EXTVCCInput 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

Description

The LTC7820 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 LTC7820 provides a small and cost effective solution for high power, non-isolated intermediate bus applications with fault protection.The LTC7820 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.ApplicationsBus ConvertersHigh Power Distributed Power SystemsCommunications SystemsIndustrial Applications