LTC7820

RECOMMENDED FOR NEW DESIGNS

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

Part Models: 4
1ku List Price: Starting From $5.61

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Overview

Low Profile, High Power Density, Capable of 500W+
Soft Switching: 99% Peak Efficiency and Low EMI
V_IN Max for Voltage Divider (2:1): 72V
V_IN Max for Voltage Doubler (1:2)/Inverter (1:1): 36V
Wide Bias V_CC Range: 6V to 72V
Soft Startup into Steady State Operation
6.5V to 40V EXTV_CC 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

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.

Applications

Bus Converters
High Power Distributed Power Systems
Communications Systems
Industrial Applications

Part Models: 4
1ku List Price: Starting From $5.61

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC7820EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7820EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7820IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7820IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC7820EUFD#PBF	PRODUCTION
LTC7820EUFD#TRPBF	PRODUCTION
LTC7820IUFD#PBF	PRODUCTION
LTC7820IUFD#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4260	RECOMMENDED FOR NEW DESIGNS	Positive High Voltage Hot Swap Controller with I²C Compatible Monitoring

Parts	Product Life Cycle	Description
LTC7821	RECOMMENDED FOR NEW DESIGNS	Hybrid Step-Down Synchronous Controller

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC7820

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC7820EUFD Demo Board | 2:1 Step-Down, 36V ≤ VIN ≤ 60V, VOUT = 0.5VIN @ up to 20A

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Product Details

Demonstration circuit 2543B is a high efficiency, high density, open loop charge pump (inductorless) DC/DC converter. This demo board is a voltage divider which achieves a 2:1 step-down ratio from an input voltage from 36V to 60V. The output voltage is a fixed ratio of half of the input voltage (V_IN/2) and can supply a 10A load current. This demo board has the option to deliver a 20A maximum load with the addition of 15 chip capacitors.

The DC2543B provides a very high efficiency solution of 98.7% when converting 48V_IN to 24V_OUT at 10A. When configured for a 20A output, an efficiency of up to 98.4% is achievable for a 48V_IN to 24V_OUT at 20A.

The demo board features the LTC7820, a fixed ratio high voltage high power switched capacitor/charge pump controller in a 4mm × 5mm QFN package. Please see LTC7820 data sheet for more detailed information.

The DC2543B needs to be powered on with no load current or a very small load current (less than 50mA) with the default setup. Large load current can be applied after V_O is established. The board offers a disconnect FET option which is controlled by the LTC7820 FAULT pin to disconnect the load during startup as shown in the schematic. Please refer to “Voltage Divider Prebalance Before Switching” section in the LTC7820 data sheet for more details regarding the startup of the voltage divider. The board also features some protection functions such as overcurrent and thermal shutdown to make it a reliable solution.