text.skipToContent text.skipToNavigation


3-20V, Voltage Mode Synchronous Buck Controller with Temperature-Compensated DCR Current Sensing

Inventory: 19,816  

Quality information

RoHS Yes
Lead finish / Ball material SN
MSL rating / Peak reflow Level-1-260C-UNLIM
Quality, reliability
& packaging information

Information included:

  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
View or download

Packaging information

Package | Pins Package qty | Carrier: Operating temperature range (℃)
WQFN (RTW) | 24 250 | SMALL T&R
-40 to 125
Package | Pins WQFN (RTW) | 24
Package qty | Carrier: 250 | SMALL T&R
Operating temperature range (℃) -40 to 125
View TI packaging information

Features for the LM27403

  • Up to 97% Efficiency and 93% Duty Cycle
  • Wide Input Voltage Range of 3 V to 20 V
  • Switching Frequency From 200 kHz to 1.2 MHz
  • Inductor-DCR-Based Overcurrent Protection With
    Thermal Compensation
  • 0.6-V Reference With 1% Feedback Accuracy
  • 30-ns Min On-Time for Low VOUT
  • Integrated High-Current MOSFET Drivers
    • Adaptive Deadtime Control
  • Ultrafast Line and Load Transient Response
    • High GBW Error Amplifier
    • PWM Line Feedforward
  • Integrated VDD Bias Supply LDO Subregulator
  • Programmable System-Level OTP
  • Precision Enable With Hysteresis
  • Frequency Synchronization
  • Monotonic Prebiased Start-up
  • Programmable Soft-Start With Tracking
  • Output Remote Sense
  • Open-Drain Power Good Indicator
  • 4-mm x 4-mm WQFN-24 PowerPAD™ Package

Description for the LM27403

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.


Qty Price (USD)
1-99 1.943
100-249 1.703
250-999 1.194
1,000+ 0.962

Additional package qty | carrier options

Package qty | Carrier 4,500 | LARGE T&R
Inventory 2,309
Qty | Price (USD) 1ku | 0.836 1-99 1.873 100-249 1.547 250-999 1.111 1,000+ 0.836
Custom reel may be available

Package qty | Carrier 1,000 | SMALL T&R
Inventory 47,748
Qty | Price (USD) 1ku | 0.836 1-99 1.873 100-249 1.547 250-999 1.111 1,000+ 0.836