LTC7820 - Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

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

Typical Application

LTC7820 Typical Application
LTC7820 Typical Application

Description

The LTC®7820 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 stepdown 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC7820EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LTC7820EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LTC7820IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LTC7820IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 Yes


LTC7820 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC7820EUFD#PBF 4x5 QFN-28 E $6.71 $4.70 Yes
LTC7820EUFD#TRPBF 4x5 QFN-28 E $6.77 $4.76 Yes
LTC7820IUFD#PBF 4x5 QFN-28 I $7.36 $5.15 Yes
LTC7820IUFD#TRPBF 4x5 QFN-28 I $7.42 $5.21 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2543A LTC7820EUFD Demo Board | 2:1 Step-Down Charge Pump, 36V ≤ VIN ≤ 60V, VOUT = 0.5VIN @ Up to 20A Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • Bus Converters
  • High Power Distributed Power Systems
  • Communications Systems
  • Industrial Applications

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC7820

Technical Support