LM5157
- 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.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | LM5157 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. A) | PDF | HTML | 2023年 5月 3日 |
Application note | How to Implement the Soft Start in a Flyback | PDF | HTML | 2023年 7月 10日 | |
Application note | How to Design an Isolated Flyback Converter Using LM5157x/LM5158x (Rev. A) | PDF | HTML | 2023年 3月 16日 | |
Application note | Basic Calculation of a Coupled Inductor SEPIC Power Stage | PDF | HTML | 2023年 3月 13日 | |
User guide | LM5157 SEPIC Evaluation Module | PDF | HTML | 2022年 3月 7日 | |
Certificate | LM5157EVM-SEPIC EU RoHS Declaration of Conformity (DoC) | 2021年 12月 23日 | ||
Application note | How to Design a Boost Converter Using LM5157x, LM5158x | PDF | HTML | 2021年 11月 11日 | |
EVM User's guide | LM5157-Q1 Flyback Converter Evaluation Module | PDF | HTML | 2021年 5月 4日 | |
Technical article | Lowering audible noise in automotive applications with TI’s DRSS technology | PDF | HTML | 2021年 3月 18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)。
LM5157EVM-BST — LM5157 升壓轉換器評估模組
LM5157EVM-FLY — LM5157 返馳升壓轉換器評估模組
LM5157EVM-SEPIC — 適用於 SEPIC 的 LM5157 評估模組
LM5157EVM-SEPIC 評估模組展示了 LM5157 作為寬輸入非同步 SEPIC 轉換器的功能和性能。標準配置的設計可在 4 V 至 32 V 輸入,在 2.1 MHz 下切換時,在最高 1 A 時提供 12 V 的穩壓輸出。
SNVR511 — LM5157 and LM5158 Quickstart Calculator for Boost Regulator Design
支援產品和硬體
產品
AC/DC 和 DC/DC 轉換器 (整合式 FET)
SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design
支援產品和硬體
產品
AC/DC 和 DC/DC 轉換器 (整合式 FET)
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
WQFN (RTE) | 16 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點