LT3988IMSE#PBF

LT3988 is a dual-channel, current mode, step-down DC/DC converter that accepts two input voltages up to 60V (80V transient), which can be sourced from separate supplies or cascaded. The device integrates high-efficiency switches, internal boost diodes, and loop compensation. Both converters deliver 1A output, synchronized to a single oscillator programmable up to 2.5MHz, and operate 180° out of phase to reduce input ripple current. Switching frequency is set via a single resistor over a range of 250kHz to 2.5MHz, or a clock signal can be applied through the SYNC pin. The high switching frequency of the LT3988 allows the use of small inductors and capacitors, enabling a very compact dual-output power supply. Constant switching frequency combined with low-impedance ceramic capacitors produces low, predictable output ripple. The current mode PWM architecture provides fast transient response with cycle-by-cycle current limiting. Diode current sensing and thermal shutdown provide additional protection. The LT3988 is available in a 16-pin MSOP package with an exposed pad to reduce thermal resistance.

Applications

• Commercial vehicle battery regulation
• Industrial power supply
• Distributed power regulation

Key features

• Wide input range: 4.1V to 60V operating voltage, overvoltage lockout protection withstands transient voltages up to 80V
• Dual 1A output switching regulators with integrated power switches
• Short-circuit robust
• Adjustable switching frequency 250kHz to 2.5MHz, synchronizable across full range
• Integrated boost diode
• Integrated loop compensation
• Antiphase switching for reduced ripple
• Low shutdown current (<2μA)
• Compatible with small inductors and ceramic capacitors
• Thermally enhanced 16-pin MSOP package