Summary of LTC3807 – 38V Micropower Synchronous Buck Controller with VOUT to 24V
The LTC3807 is a high-performance, constant-frequency current-mode synchronous step-down DC/DC controller driving all N-channel MOSFETs. It supports phase-lockable frequencies up to 750 kHz, a wide 4V–38V input range, and programmable outputs from 0.8V to 24V. Features include OPTI-LOOP compensation for broad output capacitance and ESR compatibility, a precision 0.8V reference, power good indicator, and low 50 μA no-load quiescent current for extended battery life.
Parts used in theLTC3807 Project:
- LTC3807 DC/DC controller IC
- N-channel synchronous power MOSFETs (high-side and low-side)
- Inductor for buck converter
- Input capacitors
- Output capacitors (various capacitance and ESR)
- Resistors for feedback network to set VOUT
- Compensation network components (as used with OPTI-LOOP)
- Power good indicator circuitry (pull-up resistor, LED or logic interface)
- PCB and connectors for input/output and ground
The LTC®3807 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.
The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3807 features a precision 0.8V reference and power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3807 can be programmed between 0.8V to 24V.
- What type of regulator is the LTC3807?
The LTC3807 is a step-down (buck) switching regulator DC/DC controller that drives an all N-channel synchronous MOSFET stage. - What input voltage range does the LTC3807 support?
It supports a wide input supply range from 4V to 38V. - What output voltage range can be programmed with the LTC3807?
The output voltage can be programmed between 0.8V and 24V. - What is the quiescent no-load current of the LTC3807?
The no-load quiescent current is 50 microamperes. - What switching frequency capability does the LTC3807 have?
It has a constant frequency architecture that is phase-lockable up to 750 kHz. - What compensation method does the LTC3807 use for transient response?
It uses OPTI-LOOP compensation to optimize transient response over a wide range of output capacitance and ESR values. - Does the LTC3807 include a voltage reference and power good indicator?
Yes, it features a precision 0.8V reference and a power good output indicator. - Are N-channel or P-channel MOSFETs used with the LTC3807?
The LTC3807 drives all N-channel synchronous power MOSFETs.
