Analog Devices Inc. LTC7899 Switching Regulator Controller
Analog Devices LTC7899 Switching Regulator Controller is a high-performance DC-DC, negative-to-positive controller that drives all N-channel synchronous MOSFET stages and can operate from input voltages up to 135V. The integrated feedback level shifter allows for easy programming of the positive output voltage with only two resistors. The LTC7899 can also be configured as a step-up (Boost) operation with pass-through. The gate drive voltage for the LTC7899 can be programmed from 5V to 10V to allow the use of logic or standard-level MOSFETs to maximize efficiency.
The low no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation optimizes the transient response over a wide range of output capacitance and ESR values. The user can adjust the dead times of the LTC7899 with external resistors for margin or to tailor the application for higher efficiency and allow for high-frequency operation.
The Analog Devices LTC7899 additionally features spread-spectrum operation, which significantly reduces the conducted noise and peak radiated on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.
Features
- Converts negative input to positive output, regulated with respect to ground
- Wide 4V to 135V VIN |+VOUT range (140V absolute maximum)
- Internal feedback level shifter for easy output voltage programming with two resistors
- Adjustable gate drive level of 5V to 10V (OPTI-DRIVE, 14V absolute maximum)
- Adjustable driver voltage UVLO
- Split-output gate drivers for adjustable turn-on and turn-off driver strengths
- Adaptive or resistor-adjustable dead times
- Supports positive input to positive output boost up to 135V with pass-through
- Operation down to 1V after start-up
- CLK output for high-power polyphase operation
- Spread spectrum frequency modulation
- 100kHz to 2.5MHz programmable frequency range
- 100kHz to 2.5MHz phase-lockable frequency range
- 28-pin (4mm x 5mm) QFN package
Applications
- Industrial power systems
- Military/avionics
- Telecommunications power systems
Typical Application Circuit
Development Tool
Analog Devices Inc. EVAL-LTC7899-AZ Evaluation Board
Features the LTC7899, a 140V low IQ, synchronous, negative input-to-positive output controller.