The LTC3810IUH-5 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The LTC3810IUH-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 LTC3810IUH-5 to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. A shutdown pin allows the LTC3810IUH-5 to be turned off, reducing the supply current to 240μA.
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.
FeaturesAdj UVLO, Sync & Tracking PackageLTC3810IUH-5 Vin 6.2V to 100V, 10V Driver Voltage YesSSOP-28LTC3810-5 Vin 4.35V to 60V, 5.5V Driver VoltageYesQFN-32LTC3812-5 Vin 4.35 to 60V, 5.5V Driver VoltageNoTSSOP-16EFeature
- High Voltage Operation: Up to 100V
- 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 Output Voltage Tracking/Soft-Start
- Generates 10V Driver Supply from Input Supply
- Synchronizable to External Clock
- Selectable Pulse Skip Mode Operation
- Power Good Output Voltage Monitor
- Adjustable On-Time/Frequency: tON(MIN) < 100ns
- Adjustable Cycle-by-Cycle Current Limit
- Programmable Undervoltage Lockout
- Output Overvoltage Protection
- 28-Pin SSOP Package
Applications
- 48V Telecom and Base Station Power Supplies
- Networking Equipment, Servers
- Automotive and Industrial Control Systems
(Picture: Pinout)
