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AC/DC & DC/DC converters (integrated FET)

LM21212-1

現行

具頻率同步的 2.95-5.5V、12A 電壓模式同步降壓穩壓器

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LM21212-1

現行
產品規格表 立即訂購

產品詳細資料

Iout (max) (A) 12 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Topology Buck Type Converter Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1500 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0015
Iout (max) (A) 12 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Topology Buck Type Converter Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1500 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 5.5 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0015
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • 300-kHz to 1.5-MHz frequency SYNC pin
  • Adjustable output voltage from 0.6 V to VIN (100% duty cycle capable), ±1% reference
  • Input voltage range 2.95 V to 5.5 V
  • Start-up Into prebiased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable (EN) pin with hysteresis
  • Integrated OVP, OCP, OTP, UVLO and power-good
  • Thermally enhanced HTSSOP-20 exposed pad package
  • Create a custom design using the LM21212-1 with the WEBENCH® Power Designer
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • 300-kHz to 1.5-MHz frequency SYNC pin
  • Adjustable output voltage from 0.6 V to VIN (100% duty cycle capable), ±1% reference
  • Input voltage range 2.95 V to 5.5 V
  • Start-up Into prebiased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable (EN) pin with hysteresis
  • Integrated OVP, OCP, OTP, UVLO and power-good
  • Thermally enhanced HTSSOP-20 exposed pad package
  • Create a custom design using the LM21212-1 with the WEBENCH® Power Designer

The LM21212-1 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 12 A of continuous output current while producing an output voltage down to 0.6 V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95 V to 5.5 V, making it suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty-cycle capability and can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-1 features internal overvoltage protection (OVP) and overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turnon of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good circuit.

The LM21212-1 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track an external voltage rail using the SS/TRK pin. The switching frequency can be synchronized to the falling edge of a clock between frequencies of 300 kHz to 1.5 MHz.

If the output is prebiased at start-up, it does not sink current, allowing the output to smoothly rise past the prebiased voltage. The regulator is offered in a 20-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heat sinks.

The LM21212-1 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 12 A of continuous output current while producing an output voltage down to 0.6 V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95 V to 5.5 V, making it suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty-cycle capability and can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-1 features internal overvoltage protection (OVP) and overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turnon of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good circuit.

The LM21212-1 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track an external voltage rail using the SS/TRK pin. The switching frequency can be synchronized to the falling edge of a clock between frequencies of 300 kHz to 1.5 MHz.

If the output is prebiased at start-up, it does not sink current, allowing the output to smoothly rise past the prebiased voltage. The regulator is offered in a 20-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heat sinks.
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類型 標題 日期
* Data sheet LM21212-1 2.95-V To 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Frequency Synchronization datasheet (Rev. F) PDF | HTML 2019年 5月 21日
Selection guide Buck Converter Quick Reference Guide (Rev. B) 2021年 4月 8日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
User guide AN-2107 LM21212-1 Evaluation Board (Rev. B) 2013年 5月 5日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM21212-1EVM — LM21212-1EVM 評估板

This evaluation board provides a solution to examine the high efficiency LM21212-1 buck switching regulator. The LM21212-1 is capable of driving up to 12A of continuous load current with excellent output voltage accuracy due to its ±1% internal reference. This device also features a clock (...)

使用指南: PDF
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模擬型號

LM21212-1 PSpice Average Model

SNVM395.ZIP (53 KB) - PSpice Model
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模擬型號

LM21212-1 PSpice Transient Model

SNVM394.ZIP (192 KB) - PSpice Model
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模擬型號

LM21212-1 Unencrypted PSpice Average Model

SNVM802.ZIP (1 KB) - PSpice Model
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模擬型號

LM21212-1 Unencrypted PSpice Transient Model

SNVM801.ZIP (2 KB) - PSpice Model
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計算工具

LM21212-1DESIGN-CALC — LM21212-1 設計試算表

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參考設計

PMP7804 — 適用於 Kintex 7 應用的多重輸出電源解決方案

The PMP7804 reference design provides all the power supply rails necessary to power the Xilinx ® Kintex ® 7 series family of FPGAs.  This design utilizes Simple Switcher power modules along with the LM2121x low voltage synchronous buck regulators for "ease of use" and shorter design (...)
Test report: PDF
電路圖: PDF
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