LTC7820
LTC7820
RECOMMENDED FOR NEW DESIGNSFixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $7.10
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Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
Design Note 2
Technical Articles 2
Video 2
Product Selector Card 1
Analog Dialogue 1
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) | ||
| LTC7820EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC7820IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC7820IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| 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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Tools & Simulations
LTspice 2
- LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Divider (6-72V to 0.5*Vin @ 480W)
- LTC7820 Demo Circuit - High Efficiency, High Density, Switched Capacitor Voltage Doubler (6-36V to 2*Vin @ 170W)
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.
