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The LTC7897RUFD is a high-performance, 100% duty cycle synchronous step-down DC/DC switching regulator controller with a wide input and output voltage range, suitable for a variety of application scenarios.

Performance characteristics

The main features of the LTC7897RUFD switch controller include:

Wide VIN range: 4V to 135V (absolute maximum is 140V)

Wide output voltage range: 0.8V≤VOUT ≤135V (absolute maximum value is 140V)

Adjustable gate drive level: 5V to 10V (OPTI-DRIVE, with an absolute maximum of 15V)

Adjustable driver voltage UVLO

Separate the output gate driver to adjust the strength of the on and off drivers

Adaptive or resistance-adjustable dead time

Work at 100% duty cycle

Low working IQ: 5μA (48VIN to 3.3VOUT)

Spread spectrum frequency modulation

Programmable frequency (100 kHz to 2.5 MHz)

Synchronous frequency (100kHz to 2.5MHz)

28-pin (4mmx5mm) QFN package

2. Overview

The LTC7897RUFD is a high-performance, 100% duty cycle, synchronous step-down DC/DC switching regulator controller that can drive all power levels of N-channel synchronous silicon metal oxide field-effect transistors (MOSFETs). Synchronous rectification can enhance efficiency, reduce power consumption, and simplify application design by reducing heat dissipation requirements.

The LTC7897RUFD features a wide input and output voltage range, enabling a high step-down ratio and extensive positive and negative voltage conversion. The gate driver of LTC7897RUFD features high robustness, with an absolute maximum withstand voltage of 15V. It also offers flexibility, achieving design optimization through adjustable drive levels and dead time.

The gate drive voltage of LTC7897RUFD can be adjusted within the range of 5V to 10V (optional), thus being compatible with logic level or standard threshold MOSFETs. The dead time of LTC7897RUFD can be optimized through an external resistor to achieve margin or customized applications, thereby achieving higher efficiency and supporting high-frequency operation.

3. Application scenarios

The LTC7897RUFD is suitable for a variety of application scenarios, including:

Industrial power system

Military/avionics

Telecommunication power supply system

In addition, LTC7897RUFD also has the following main parameters:

Output type: Transistor driver

Function: Lower blood pressure

Output configuration: Positive

Topology: Voltage reduction

Output number: 1

Output stage: 1

Voltage - Power Supply (Vcc/Vdd) : 4V to 135V

Frequency - Switch: 100kHz to 2.5MHz

Duty cycle (maximum) : 100%

Synchronous rectifier: Yes

Clock synchronization: Yes

Serial interface: -

Control features: Current limiting, no-load time control, frequency control, phase control, good power supply, soft start, tracking

Operating temperature: -40°C to 150°C (TJ)

Installation type: Surface mount type

Package/Shell: 28-QFN

For exclusive quotations of LTC7897RUFD switch controller, please visit the official website of Mingjiada Electronics (www.hkmjd.com).