LTC7820
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LTC7820

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

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LTspice LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Doubler (6-36V to 2*Vin @ 170W) Download 9.04 KB LTspice LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Divider (6-72V to 0.5*Vin @ 480W) Download 8.8 KB LTspice LTC7820 - Inductorless (Charge Pump) DC/DC Converters Download 5.34 KB
Part Models 4
1ku List Price Starting From $5.61
Features
  • 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
Additional Details
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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
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file View Data Sheet
Documentation View All Documentation
LTspice LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Doubler (6-36V to 2*Vin @ 170W) Download 9.04 KB LTspice LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Divider (6-72V to 0.5*Vin @ 480W) Download 8.8 KB LTspice LTC7820 - Inductorless (Charge Pump) DC/DC Converters Download 5.34 KB
Part Models 4
1ku List Price Starting From $5.61
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LTC7820

Documentation

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Data Sheet

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UPDATED 07/19/2017
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LTC7820: Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller Data Sheet

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UPDATED 05/17/2017
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LTC7820: 固定比率、高電力 インダクタ不要の（チャージポンプ） DC/DCコントローラ データシート

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UPDATED 05/18/2017
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DC2543B Demo Manual (Rev.0) redirect icon

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UPDATED 07/09/2024
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How to Benefit from Charge Pump Technology for Voltage Conversion redirect icon

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UPDATED 06/01/2021
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How the Smart Hardware Engineer Can Easily Design Power Supplies: Mini Tutorial redirect icon

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UPDATED 06/01/2021
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智能硬件工程师如何能够轻松设计电源：小型指南 redirect icon

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UPDATED 06/01/2021
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電源を体系的に理解する―― 優れた技術者はどのように設計を行っているのか？ redirect icon

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UPDATED 01/01/2019
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High Efficiency, High Density, Switched Capacitor Converter for High Power Applications redirect icon

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UPDATED 01/01/2019
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面向高功率应用的高效率、高密度开关电容电源 redirect icon

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UPDATED 01/01/2019
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高電力アプリケーション用の高効率・高密度スイッチド・キャパシタ・コンバータ redirect icon

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UPDATED 03/02/2018
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Design Note 571: 170W Voltage Doubler in 23mm × 16.5mm Package redirect icon

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UPDATED 03/02/2018
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设计要点: 采用 23mm x 16.5mm 封装的 170W 倍压器 redirect icon

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UPDATED 03/02/2018
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DN-571: 23mm × 16.5mm のパッケージに収容された 170W 電圧ダブラ redirect icon

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Documentation

Technical Documents 6
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Data Sheet 1

LTC7820: Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller Data Sheet

User Guide 1

DC2543B Demo Manual (Rev.0)

Design Note 2

High Efficiency, High Density, Switched Capacitor Converter for High Power Applications
Design Note 571: 170W Voltage Doubler in 23mm × 16.5mm Package

Technical Articles 2

How to Benefit from Charge Pump Technology for Voltage Conversion
How the Smart Hardware Engineer Can Easily Design Power Supplies: Mini Tutorial

Product Selector Card 1

80V to 150V Non-Isolated DC/DC

Analog Dialogue 1

72 V Hybrid DC-to-DC Converter Reduces Intermediate Bus Converter Size by up to 50%

Video

2

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Video

2018-12-05

02:04

Switched Capacitor and Hybrid DC/DC Supplies

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2019-03-27

02:06

High Power, High Density Switched Capacitor & Hybrid Converter

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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) external-link
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  • Material Declaration external-link
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LTC7820EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC7820IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC7820IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC7820EUFD#PBF

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LTC7820EUFD#TRPBF

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LTC7820IUFD#PBF

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LTC7820IUFD#TRPBF

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Jan 20, 2022

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC7820EUFD#PBF

PRODUCTION

LTC7820EUFD#TRPBF

PRODUCTION

LTC7820IUFD#PBF

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LTC7820IUFD#TRPBF

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Detailed Change Description

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Software & Part Ecosystem

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Evaluation Kits 1

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DC2543B

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

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DC2543B

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

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DC2543B
LTC7820EUFD Demo Board | 2:1 Step-Down, 36V ≤ VIN ≤ 60V, VOUT = 0.5VIN @ up to 20A
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Product Detail

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 (VIN/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 48VIN to 24VOUT at 10A. When configured for a 20A output, an efficiency of up to 98.4% is achievable for a 48VIN to 24VOUT 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 VO 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.

Resources

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DC2543B Demo Manual (Rev.0) Download

1.08 M

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DC2543B Design Files Download

1.00M

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DC2543B Schematic Download

68.00K

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Evaluation Kits1

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DC2543B

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

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Doubler (6-36V to 2*Vin @ 170W) Download

9.04 K

spice tool Lt Spice

LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Divider (6-72V to 0.5*Vin @ 480W) Download

8.8 K

spice tool Lt Spice

LTC7820 - Inductorless (Charge Pump) DC/DC Converters Download

5.34 K

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