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.
| 種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
|---|---|---|---|---|---|---|
| * | データシート | LM27403 Synchronous Buck Controller With Temperature-Compensated, Inductor-DCR-Based Overcurrent Protection and Programmable Thermal Shutdown データシート (Rev. B) | PDF | HTML | 2014年 9月 12日 | ||
| 技術記事 | When and how to supply an external bias for buck controllers – part 2 | PDF | HTML | 2017年 12月 22日 | |||
| 技術記事 | When and how to supply an external bias for buck controllers – part 1 | PDF | HTML | 2017年 12月 21日 | |||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016年 7月 21日 | ||||
| 技術記事 | High Density PCB Layout of DC/DC Converters, Part 2 | PDF | HTML | 2015年 9月 16日 | |||
| 技術記事 | High Density PCB Layout of DC/DC Converters, Part 1 | PDF | HTML | 2015年 9月 12日 | |||
| EVM ユーザー ガイド (英語) | LM27403 Evaluation Module User's Guide (Rev. A) | 2013年 10月 17日 | ||||
| EVM ユーザー ガイド (英語) | LM27403EVM-POL600 30A Ultra-Compact DC/DC Regulator Evaluation Module | 2013年 10月 16日 | ||||
| アプリケーション・ノート | Current Limit Foldback Improves Short Circuit Protection in LM274X Family (Rev. B) | 2013年 4月 23日 |
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LM27403EVM-POL600 is a 600-kHz synchronous buck dc-dc regulator showcasing high power density and high efficiency. A 20 mm x 15 mm module on a single-side PCB uses a power block MOSFET from TI. Accurate overcurrent protection is available by leveraging the inductor’s sub-mΩ DCR and (...)
Welcome to the LM27403 Quick-Start Design Tool. This stand-alone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM27403 voltage-mode PWM controller. As such, the user can expeditiously arrive at an optimized design to meet the application (...)
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |