Texas Instruments LM27403

Description

The LM27403 is a feature-rich, easy-to-use, synchronous buck controller offering exceptional levels of integration and performance for superior efficiency in high power density, point-of-load (POL) DC-DC regulator solutions. The resistor-programmable switching frequency from 200 kHz to 1.2 MHz and integrated, high-current MOSFET gate drivers with adaptive deadtime offer flexibility to optimize solution size and maximize conversion efficiency.High precision and low output voltage are easily obtained with a 0.6-V, 1% accurate voltage reference together with a 30-ns high-side MOSFET minimum controllable on-time. Using lossless inductor dc resistance (DCR) current sensing and an inexpensive 2N3904 BJT to sense temperature remotely at the inductor, the LM27403 supports accurate and thermally compensated overcurrent protection (OCP).The LM27403 has a conventional voltage-mode control loop with high gain-bandwidth error amplifier and PWM input voltage feedforward to simplify compensation design and enable excellent transient response throughout the full line voltage and load current ranges. Forced-PWM (FPWM) operation eliminates frequency variation to minimize EMI in sensitive applications. An open-drain Power Good circuit provides power-rail sequencing and fault reporting. Other features include programmable system-level thermal shutdown with automatic recovery, output voltage remote sense, configurable soft-start, monotonic start-up into prebiased loads, an integrated bias supply low-dropout (LDO) regulator, external power supply tracking, precision enable with customizable hysteresis for programmable line undervoltage lockout (UVLO), and synchronization capability for beat frequency sensitive and multiregulator applications. The LM27403 is offered in a 4-mm x 4-mm thermally enhanced WQFN-24 package with 0.5-mm pitch

Features

Up to 97% Efficiency and 93% Duty CycleWide Input Voltage Range of 3 V to 20 VSwitching Frequency From 200 kHz to 1.2 MHzInductor-DCR-Based Overcurrent Protection WithThermal Compensation0.6-V Reference With 1% Feedback Accuracy30-ns Min On-Time for Low VOUTIntegrated High-Current MOSFET Drivers Adaptive Deadtime Control

Ultrafast Line and Load Transient Response High GBW Error AmplifierPWM Line Feedforward

Integrated VDD Bias Supply LDO SubregulatorProgrammable System-Level OTPPrecision Enable With HysteresisFrequency SynchronizationMonotonic Prebiased Start-upProgrammable Soft-Start With TrackingOutput Remote SenseOpen-Drain Power Good Indicator4-mm x 4-mm WQFN-24 PowerPAD™ Package

Typical applications

• Embedded Computing, Servers, Storage
• DC-DC Converters and POL Modules
• Telecommunications Infrastructure

More information

• Datasheet
• IC product information