LTC3862 is a two phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. It has adjustable slope compensation gain to optimize the current loop gain and improve noise immunity. 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.
The LTC3862 is a two‑phase constant‑frequency current‑mode controller that drives N‑channel MOSFETs for boost and SEPIC applications. It reduces filter capacitance, provides a 5 V gate‑drive for logic‑level MOSFETs, and offers adjustable slope‑compensation, leading‑edge blanking, and a maximum duty cycle of up to 96 %. The device supports multi‑phase operation (2‑, 3‑, 4‑, 6‑ or 12‑phase) via SYNC and CLKOUT pins.
Electrical characteristics include a 4 V to 36 V input range, an internal 5 V LDO regulator, and a programmable operating frequency from 75 kHz to 500 kHz. The IC is offered in several 24‑lead packages (TSSOP, SSOP, QFN) with temperature grades ranging from –40 °C to 150 °C. Ordering information and part numbers for each package are provided.
| Input Supply Voltage Range | 4 V – 36 V |
|---|---|
| Internal LDO Regulator Output Voltage | 5.0 V – 5.2 V |
| Maximum Duty Cycle | Up to 96 % |
| Programmable Operating Frequency | 75 kHz – 500 kHz |
The device operates with an input voltage from 4 V to 36 V.
The maximum duty cycle can be set up to 96 %.
The operating frequency is programmable between 75 kHz and 500 kHz.
The internal LDO provides a regulated output of 5.0 V to 5.2 V.