LM5157

現行

具雙隨機展頻的 6A/4A、50-V、2.2-MHz 大範圍 VIN 升壓、返馳式、SEPIC 轉換器

立即訂購

產品規格表

document-pdfAcrobat LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. A) (英文) PDF | HTML

LM5157

現行

產品規格表

立即訂購

產品詳細資料

Rating

Catalog

Topology

Boost, Flyback, SEPIC

Vin (max) (V)

45

Vin (min) (V)

1.5

Vout (max) (V)

48

Vout (min) (V)

1.5

Switch current limit (typ) (A)

7.5

Features

Enable, Frequency synchronization, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable

EMI features

Frequency Dithering, Spread Spectrum

Control mode

current mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.00067

Duty cycle (max) (%)

93

TI functional safety category

Functional Safety-Capable

Rating

Catalog

Topology

Boost, Flyback, SEPIC

Vin (max) (V)

45

Vin (min) (V)

1.5

Vout (max) (V)

48

Vout (min) (V)

1.5

Switch current limit (typ) (A)

7.5

Features

Enable, Frequency synchronization, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable

EMI features

Frequency Dithering, Spread Spectrum

Control mode

current mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.00067

Duty cycle (max) (%)

93

TI functional safety category

Functional Safety-Capable

WQFN (RTE)

16

9 mm² (3 mm × 3 mm)

Suited for wide operating range for battery applications
- 2.9-V to 45-V input operating range
- 48-V maximum output (50-V abs max)
- Minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V
- Input transient protection up to 50 V
- Minimized battery drain
  - Low shutdown current (I Q ≤ 2.6 µA)
  - Low operating current (I Q ≤ 670 µA)
Small solution size and low cost
- Maximum switching frequency up to 2.2 MHz
- 16-pin QFN package (3 mm × 3 mm)
- Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
- Accurate current limit (see the Device Comparison Table)
EMI mitigation
- Selectable dual random spread spectrum
- Lead-less package
Higher efficiency with low-power dissipation
- 45-mΩ R DSON switch
- Fast switching, small switching loss
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable wide switching frequency from 100 kHz to 2.2 MHz
Integrated protection features
- Constant current limiting over input voltage
- Selectable hiccup mode overload protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
Accurate ±1% accuracy feedback reference
Adjustable soft start
PGOOD indicator
Create a custom design using the LM5157x with the WEBENCH Power Designer

Suited for wide operating range for battery applications
- 2.9-V to 45-V input operating range
- 48-V maximum output (50-V abs max)
- Minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V
- Input transient protection up to 50 V
- Minimized battery drain
  - Low shutdown current (I Q ≤ 2.6 µA)
  - Low operating current (I Q ≤ 670 µA)
Small solution size and low cost
- Maximum switching frequency up to 2.2 MHz
- 16-pin QFN package (3 mm × 3 mm)
- Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
- Accurate current limit (see the Device Comparison Table)
EMI mitigation
- Selectable dual random spread spectrum
- Lead-less package
Higher efficiency with low-power dissipation
- 45-mΩ R DSON switch
- Fast switching, small switching loss
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable wide switching frequency from 100 kHz to 2.2 MHz
Integrated protection features
- Constant current limiting over input voltage
- Selectable hiccup mode overload protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
Accurate ±1% accuracy feedback reference
Adjustable soft start
PGOOD indicator
Create a custom design using the LM5157x with the WEBENCH Power Designer

The LM5157 device is a wide input range, non-synchronous boost converter with integrated 50-V power switch.

The device can be used in boost, SEPIC, and flyback topologies. The device can start up from a single-cell battery with a minimum of 2.9 V. It can operate with an input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.

The BIAS pin operates up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the power supply, the device provides a selectable Dual Random Spread Spectrum, which reduces the EMI over a wide frequency range.

The device features an accurate peak current limit over the input voltage, which avoids overdesigning power inductor. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as overvoltage protection, line UVLO, thermal shutdown, and selectable Hiccup mode overload protection. Additional features include low shutdown I Q, programmable soft start, precision reference, a power-good indicator, and external clock synchronization.

The LM5157 device is a wide input range, non-synchronous boost converter with integrated 50-V power switch.

The device can be used in boost, SEPIC, and flyback topologies. The device can start up from a single-cell battery with a minimum of 2.9 V. It can operate with an input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.

The BIAS pin operates up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the power supply, the device provides a selectable Dual Random Spread Spectrum, which reduces the EMI over a wide frequency range.

The device features an accurate peak current limit over the input voltage, which avoids overdesigning power inductor. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as overvoltage protection, line UVLO, thermal shutdown, and selectable Hiccup mode overload protection. Additional features include low shutdown I Q, programmable soft start, precision reference, a power-good indicator, and external clock synchronization.

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LM5158

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重要文件	類型	標題	格式選項	日期
*	資料表	LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. A)	PDF \| HTML	2023/5/3
	Application brief	Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs	PDF \| HTML	2025/9/16
	應用說明	How to Implement the Soft Start in a Flyback	PDF \| HTML	2023/7/10
	應用說明	How to Design an Isolated Flyback Converter Using LM5157x/LM5158x (Rev. A)	PDF \| HTML	2023/3/16
	應用說明	Basic Calculation of a Coupled Inductor SEPIC Power Stage	PDF \| HTML	2023/3/13
	證書	LM5157EVM-SEPIC EU RoHS Declaration of Conformity (DoC)		2021/12/23
	應用說明	How to Design a Boost Converter Using LM5157x, LM5158x	PDF \| HTML	2021/11/11
	技術文章	Lowering audible noise in automotive applications with TI’s DRSS technology	PDF \| HTML	2021/3/18

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開發板

LM5157EVM-BST — LM5157 升壓轉換器評估模組

LM5157EVM-BST 評估模組展示 LM5157 裝置的功能和性能，此裝置為具備雙隨機展頻的寬輸入電壓升壓轉換器。標準配置的設計可在 3 V 至 9 V 輸入 (從 < 6 V 輸入起負載降低一半)、2.1 MHz 切換頻率時，在 1.6 A 時提供 12 V 的穩壓輸出。

使用指南: PDF | HTML

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LM5157EVM-FLY — LM5157 返馳升壓轉換器評估模組

LM5157EVM-FLY 評估模組展示 LM5157 做為返馳式轉換器的功能和性能，可為三相逆變器閘極驅動器偏壓電源的典型應用產生多重輸出電壓軌。標準配置專為從 8-V 至 16-V 輸入在 250mA 提供 10-V 的穩壓輸出，以及分別在 75mA、75mA 及 150mA 提供三個隔離式 20-V 軌設計。切換頻率為 250kHz。