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DC/DC 轉換器

LMR51403

現行

具 25µA 靜態電流的 4.5V 至 42V 0.3A 同步降壓轉換器

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產品規格表

LMR51403

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.3 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 28 Vout (min) (V) 0.8 Features Enable, Forced PWM, Overcurrent protection, Prebias startup, Synchronous rectification Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000025 Duty cycle (max) (%) 96 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 0.3 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 28 Vout (min) (V) 0.8 Features Enable, Forced PWM, Overcurrent protection, Prebias startup, Synchronous rectification Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000025 Duty cycle (max) (%) 96 TI functional safety category Functional Safety-Capable
SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4V to 42V input voltage range
    • Input transient protection up to 50V
    • 300mA continuous output current
    • 80ns minimum switching on time
    • Fixed 400kHz and 1.1MHz switching frequency
    • –40°C to 150°C junction temperature range
    • 96% maximum duty cycle
    • Monotonic start-up with prebiased output
    • Short-circuit protection with hiccup mode
    • Precision enable
    • ±1.5% tolerance voltage reference
  • Small design size and ease of use
    • Integrated synchronous rectification
    • Internal compensation for ease of use
    • SOT-23 package
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
  • Pin-to-pin compatible with the LMR51610, LMR51406, LMR16006, LV2862, LMR50410, TPS560430, and LMR54410
  • Create a custom design using the LMR51403 with the WEBENCH ™ Power Designer
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4V to 42V input voltage range
    • Input transient protection up to 50V
    • 300mA continuous output current
    • 80ns minimum switching on time
    • Fixed 400kHz and 1.1MHz switching frequency
    • –40°C to 150°C junction temperature range
    • 96% maximum duty cycle
    • Monotonic start-up with prebiased output
    • Short-circuit protection with hiccup mode
    • Precision enable
    • ±1.5% tolerance voltage reference
  • Small design size and ease of use
    • Integrated synchronous rectification
    • Internal compensation for ease of use
    • SOT-23 package
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
  • Pin-to-pin compatible with the LMR51610, LMR51406, LMR16006, LV2862, LMR50410, TPS560430, and LMR54410
  • Create a custom design using the LMR51403 with the WEBENCH ™ Power Designer

The LMR51403 is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 300mA load current. With a wide input range of 4V to 42V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR51403 operates at 400kHz and 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The LMR51403 has a pulse frequency modulation (PFM version) to realize high efficiency at light load and forced pulse width modulation (FPWM version) to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.

The LMR51403 is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 300mA load current. With a wide input range of 4V to 42V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR51403 operates at 400kHz and 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The LMR51403 has a pulse frequency modulation (PFM version) to realize high efficiency at light load and forced pulse width modulation (FPWM version) to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.
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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LMR51403 4V to 42V, 300mA, Synchronous Buck Converter in a SOT-23 Package datasheet PDF | HTML 2024/11/19
應用說明 Power Design Considerations for Sensor Transmitters in Explosive Atmospheres PDF | HTML 2025/3/17
功能安全資訊 LMR51403 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 2024/10/9

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LMR51603EVM — LMR51603 評估模組

LMR51603EVM 是完全組裝且經過測試的電路，旨在協助使用者輕鬆評估和測試 LMR51603 轉換器的運作和功能。此評估模組以典型的 12V 輸入運作，並可在 300mA 時提供 5V 輸出。整合式低 RDS(ON) 電源 MOSFET 可透過最少的外部零組件數量，協助空間有限的電源系統實現高效率，並為其提供易於使用的方式。
使用指南: PDF | HTML
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