Features and Benefits
- Wide VIN Range: 4V to 36V Operation
- 2-Phase Operation Reduces Input and Output Capacitance
- Fixed Frequency, Peak Current Mode Control
- 5V Gate Drive for Logic-Level MOSFETs
- Adjustable Slope Compensation Gain
- Adjustable Max Duty Cycle (Up to 96%)
- Adjustable Leading Edge Blanking
- ±1% Internal Voltage Reference
- Programmable Operating Frequency with One External Resistor (75kHz to 500kHz)
- Phase-Lockable Fixed Frequency 50kHz to 650kHz
- SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or 12-Phase Operation (PHASEMODE Programmable)
- Internal 5V LDO Regulator
- 24-Lead Narrow SSOP Package
- 5mm × 5mm QFN with 0.65mm Lead Pitch and 24-Lead Thermally Enhanced TSSOP Packages
- AEC-Q100 Qualified for Automotive Applications
The LTC3862 is a two phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. Two phase operation reduces system filtering capacitance and inductance requirements.
The operating frequency can be set with an external resistor over a 75kHz to 500kHz range and can be synchronized to an external clock using the internal PLL. Multi-phase operation is possible using the SYNC input, the CLKOUT output and the PHASEMODE control pin allowing 2-, 3-, 4-, 6- or 12-phase operation.
Other features include an internal 5V LDO with undervoltage lockout protection for the gate drivers, a precision RUN pin threshold with programmable hysteresis, soft-start and programmable leading edge blanking and maximum duty cycle.
|Part Number||Vin Range||INTVcc||VIN ON||VIN OFF|
|LTC3862||4V to 36V||5V||3.3V||2.9V|
|LTC3862-1||8.5V to 36V||10V||7.5V||7.0V|
|LTC3862-2||5.5V to 36V||10V||4.4V||3.9V|
- Automotive, Telecom and Industrial Power Supplies
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 1286A is DC/DC boost converter featuring the LTC3862EGN/-1 constant frequency current mode boost controllers. The DC1286A-A (LTC3862) operates over 5V to 36V input and provides 2A-5A of output current at 48V output. The DC1286A-B (LTC3862-1, higher VIN min and higher gate drive) operates over 8V to 36V input and provides 3A-5A of output current at 48V output. The 200kHz constant frequency operation results in small and efficient circuit. The converter provides high output voltage accuracy (typically ±3%) over wide load range with no minimum load requirement. The demonstration circuit can be easily modified to generate different output voltages.
Documentation & Resources
R526 Reliability Data3/26/2018365 K
DC1286A - Demo Manual9/24/20092M
DN453 - 4-Phase Boost Converter Delivers 384W with no Heat Sink9/23/200893K
Tools & Simulations
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LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
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