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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM21212-2

現行

具可調節頻率的 2.95-5.5V、12A 電壓模式同步降壓穩壓器

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功能與所比較的裝置相似
TPS62872 現行 6-V 12-A 可堆疊同步降壓轉換器 Smaller total BOM count and size

LM21212-2

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 12 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1500 Features Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 5.5 Iq (typ) (µA) 1500 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 12 Vin (min) (V) 2.95 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1500 Features Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 5.5 Iq (typ) (µA) 1500 Duty cycle (max) (%) 100
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 1.55-MHz Resistor-Adjustable Frequency
  • 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
  • Startup Into Prebiased Loads
  • Output Voltage Tracking Capability
  • Wide Bandwidth Voltage Loop Error Amplifier
  • Adjustable Soft-Start With External Capacitor
  • Precision Enable Pin With Hysteresis
  • Integrated OVP, OCP, OTP, UVLO, and Power-Good
  • Thermally Enhanced 20-Pin HTSSOP Exposed Pad Package
  • Create a custom design using the LM21212-2 with the WEBENCH® Power Designer
  • Integrated 7-mΩ High Side and 4.3-mΩ Low-Side FET Switches
  • 300-kHz to 1.55-MHz Resistor-Adjustable Frequency
  • 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
  • Startup Into Prebiased Loads
  • Output Voltage Tracking Capability
  • Wide Bandwidth Voltage Loop Error Amplifier
  • Adjustable Soft-Start With External Capacitor
  • Precision Enable Pin With Hysteresis
  • Integrated OVP, OCP, OTP, UVLO, and Power-Good
  • Thermally Enhanced 20-Pin HTSSOP Exposed Pad Package
  • Create a custom design using the LM21212-2 with the WEBENCH® Power Designer

The LM21212-2 is a monolithic synchronous 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 suitable for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity and narrow duty-cycle capability, and it can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-2 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 LM21212-2 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 programmed between 300 kHz and 1.55 MHz with an external resistor.

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 LM21212-2 is a monolithic synchronous 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 suitable for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity and narrow duty-cycle capability, and it can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-2 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 LM21212-2 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 programmed between 300 kHz and 1.55 MHz with an external resistor.

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 LM21212-2 2.95-V to 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Adjustable Frequency datasheet (Rev. B) PDF | HTML 2019年 6月 3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-2140 LM21212-2 Evaluation Board (Rev. A) 2013年 5月 5日

設計與開發

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開發板

LM21212-2EVM — 用於 LM21212-2 的評估板

This evaluation board provides a solution to examine the high efficiency LM21212-2 buck switching regulator. The LM21212-2 is capable of driving up to 12A of continuous load current with excellent output voltage accuracy due to its ±1% internal reference. The LM21212-2 is capable of down converting (...)

使用指南: PDF
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模擬型號

LM21212-2 Unencrypted PSpice Average Model

SNVM803.ZIP (1 KB) - PSpice Model
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模擬型號

LM21212-2 Unencrypted PSpice Average Model Package (Rev. A)

SNVM396A.ZIP (46 KB) - PSpice Model
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模擬型號

LM21212-2 Unencrypted PSpice Transient Model

SNVM804.ZIP (3 KB) - PSpice Model
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模擬型號

LM21212-2 Unencrypted PSpice Transient Model Package (Rev. A)

SNVM397A.ZIP (225 KB) - PSpice Model
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計算工具

LM21212-2DESIGN-CALC — LM21212-2 設計試算表

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HTSSOP (PWP) 20 Ultra Librarian
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