LTC7820

RECOMMENDED FOR NEW DESIGNS

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

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

  • 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
LTC7820
Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller
Very High Efficiency 5A Voltage Divider Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

User Guide 1

Design Note 2

Technical Articles 2

Data Sheet

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

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Hardware Ecosystem

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

LTspice 3

Models for the following parts are available in LTspice:

  • LTC7820
LTspice

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

eval board
schematic 1
DC2543B

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

Latest Discussions

2 Years Ago
RE: Output voltage accuracy of LTC7820
2 Years Ago
RE: Request replacements of LTC7820/LTC7821
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