Features and Benefits
- High Voltage Operation: Up to 60V
- Large 1Ω Gate Drivers
- No Current Sense Resistor Required
- Dual N-Channel MOSFET Synchronous Drive
- Extremely Fast Transient Response
- ±0.5% 0.8V Voltage Reference
- Programmable Soft-Start
- Generates 5.5V Driver Supply
- Selectable Pulse-Skipping Mode Operation
- Power Good Output Voltage Monitor
- Adjustable On-Time/Frequency: tON(MIN) < 100ns
- Adjustable Cycle-by-Cycle Current Limit
- Undervoltage Lockout On Driver Supply
- Output Overvoltage Protection
- Thermally Enhanced 16-Pin TSSOP Package
The LTC3812-5 is a synchronous step-down switching regulator controller that can directly step down voltages from up to 60V input, making it ideal for telecom and automotive applications. The LTC3812-5 uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit without requiring a sense resistor.
A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifier provides very fast line and load transient response. Large 1Ω gate drivers allow the LTC3812-5 to drive large power MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN. A shutdown pin allows the LTC3812-5 to be turned off reducing the supply current to <230μA.
Integrated bias control generates gate drive power from the input supply during start-up and when an output short-circuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher efficiency.
|Features||Adj UVLO, Sync & Tracking||Package|
|LTC3810||Vin 6.2V to 100V, 10V Driver Voltage||Yes||SSOP-28|
|LTC3810-5||Vin 4.35V to 60V, 5.5V Driver Voltage||Yes||QFN-32|
|LTC3812-5||Vin 4.35 to 60V, 5.5V Driver Voltage||No||TSSOP-16E|
- 48V Telecom and Base Station Power Supplies
- Networking Equipment, Servers
- Automotive and Industrial Control Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 1035 is a current mode synchronous switching regulator featuring the LTC3812-5. The circuit is configured as a synchronous step-down regulator operating at 260kHz switching frequency. The output voltage is 3.3V at 6A maximum load. The input voltage range is 7V to 60V.
Tools & Simulations
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.
Models for the following parts are available in LTspice:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.