LMG5126RXR - 2.5MHz Wide-Input Boost Converter | Texas Instruments
MPN： LMG5126RXR ✓ 啟用中LMG5126RXR 概覽
A boost converter, also called a step-up converter, is a switching regulator that produces an output voltage higher than its input. It sits within the power management IC (PMIC) hierarchy, which spans linear regulators, DC-DC converters, and battery management ICs. Boost topologies are essential wherever a source voltage is lower than the required rail, such as single-cell battery systems, USB Power Delivery, and LED backlighting. Synchronous rectification replaces the freewheeling diode with a MOSFET, cutting conduction losses and improving efficiency at load.
Key features of the LMG5126RXR include the high 2.5MHz switching frequency, integrated power switches, and an ATRK output-voltage tracking pin that enables precise voltage sequencing and dynamic voltage scaling for processors and FPGAs. Protection features include overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO), ensuring robust operation in demanding environments such as automotive infotainment and industrial systems.
Architecturally, the device employs fixed-frequency pulse-width modulation (PWM), which simplifies EMI filtering at known harmonics and provides predictable transient behavior. The integrated low on-resistance MOSFETs reduce conduction losses, while the compact surface-mount package supports high-power-density layouts.
Typical applications include battery-powered portable devices, point-of-load boost rails, LED backlight drivers, automotive infotainment systems, and USB PD power stages. Pricing as of 2026-08-30 should be confirmed with authorized distributors.
Design tip: select the inductor and output capacitor per the datasheet equations for the target output voltage and load, and configure the ATRK pin voltage to program the desired output level; keep high-current loops short with solid ground planes to control parasitic inductance and EMI.
直接替換替代品，適用於 LMG5126RXR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LMG5126RXR （相同外形與佔位） — 差異在於 Qualification, Switching Frequency.
LMG5126QRXRQ1
✅ 直接替換聯絡詢價
查看資料表 →LMG5126VBTR
✅ 直接替換📋 參考替代品（不在目錄中）
LMG5126RXR 最大額定值與電氣特性
| 拓撲 | Synchronous Boost (step-up) |
| 切換頻率 | 2.5 MHz (fixed, PWM) |
| 輸出電壓 | Adjustable via ATRK pin |
| Integrated Switches | Low-side and high-side power MOSFETs |
| Control Scheme | Fixed-frequency PWM with ATRK output-voltage tracking |
| Protection Features | Overcurrent protection, thermal shutdown, UVLO |
| 安裝類型 | Surface Mount |
| Qualification | Standard grade (see LMG5126-Q1 for automotive) |
LMG5126RXR standard 腳位配置指南
LMG5126RXR（standard 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： LMG5126RXR.
請參閱 資料表 以查看完整腳位配置。
典型應用
LMG5126RXR 適用於 6 應用s: Battery-Powered Portable Devices, Automotive Infotainment Power, LED Backlight Drivers, Processor and FPGA Point-of-Load Rails, USB Power Delivery Stages, Industrial Automation Power.
Battery-Powered Portable Devices
The LMG5126RXR suits single-cell and multi-cell battery systems where the source voltage is below the required rail. Its 2.5MHz fixed switching frequency permits very small inductors and capacitors, directly shrinking PCB area in wearables, handheld instruments, and portable test gear. The integrated MOSFETs remove external switch BOM items, and the wide input range accommodates battery discharge curves. The trade-off of high-frequency operation is increased switching loss at light load, so verify efficiency targets at your real load profile per the datasheet curves.
推薦
Automotive Infotainment Power
In automotive infotainment displays and audio modules, the automotive-qualified LMG5126QRXRQ1 variant of this converter boosts battery-rail voltages to local logic and audio supplies. Fixed-frequency 2.5MHz PWM concentrates EMI at predictable harmonics above the AM band region, easing compliance filtering in crowded cabins. UVLO, overcurrent, and thermal shutdown protection support robust cold-crank and transient environments. Designs should keep high-current loops short with solid ground planes to control radiated emissions in the AM/FM-sensitive environment.
推薦
LED Backlight Drivers
Boost converters are the natural topology for LED strings that require more voltage than the supply provides. The LMG5126RXR steps up the input with synchronous rectification, cutting the conduction losses a diode-rectified boost would incur. The 2.5MHz operation allows small magnetics behind display panels where height and area are constrained. ATRK-based output control supports luminance trimming schemes. Pair with a dedicated LED driver or PWM dimming control to regulate string current; confirm maximum output current against the datasheet ratings for your string count.
推薦
Processor and FPGA Point-of-Load Rails
The ATRK tracking pin makes the LMG5126RXR well suited to processor and FPGA rails requiring power sequencing or dynamic voltage scaling. By driving ATRK from a DAC or tracking rail, the output follows the reference, enabling voltage margining and orderly startup ordering alongside other PMIC outputs. The 2.5MHz switching keeps the output filter small enough for dense compute boards. Designers should size the output capacitor for load-transient excursions at the processor die and validate loop stability at the scaled voltage extremes.
推薦
USB Power Delivery Stages
USB PD sink applications often need to boost intermediate battery or VBUS-derived voltages to system rails. The LMG5126RXR's wide input range and synchronous boost topology fit these stages, with integrated switches reducing solution size in connector-adjacent layouts. Fixed 2.5MHz PWM simplifies meeting conducted-emission requirements near sensitive USB 3.x data lines. Place the converter and its small filter components away from the data pair with ground guarding, and confirm the thermal profile at peak PD negotiation currents using the datasheet thermal data.
推薦
Industrial Automation Power
Industrial 24V-adjacent subsystems and sensor nodes frequently need local elevated rails from lower auxiliary supplies. The LMG5126RXR provides a compact synchronous boost with UVLO, overcurrent, and thermal protection appropriate to unattended industrial environments. Its fixed-frequency operation keeps EMI behavior deterministic alongside PLC and motor-drive circuitry. The ATRK pin allows rail margining during factory test. Evaluate the standard RXR grade for factory-floor equipment and the Q1 variant where extended temperature or automotive-customer requirements apply.
推薦
推薦產品摘要
工程參考資料，適用於 LMG5126RXR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LMG5126QRXRQ1 | LMG5126VBTR | TPS610981DSET |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Topology | Synchronous Boost | Synchronous Boost | Synchronous Boost | Boost |
| Integrated MOSFETs | Yes (low-side and high-side) | Yes | Yes | Yes |
| Automotive Grade | No (standard grade) | Yes (AEC-Q100) | No | No |
主要差異化特點
- ATRK-based output tracking enables dynamic voltage scaling (對比TPS610981DSET)
- Automotive drop-in migration path (對比LMG5126QRXRQ1)
- Integrated high-side and low-side MOSFETs (synchronous rectification) (對比Diode-rectified boost alternatives (e.g., TPS61160 class))
設計說明
Keep the high-current boost loops short: the input loop through the inductor and low-side switch, and the output loop through the high-side switch and output capacitors, carry pulsed currents at 2.5MHz. Place input and output ceramic capacitors directly at the device pins over a solid ground plane. Minimize parasitic inductance in the switch nodes to reduce ringing and radiated EMI; pour ground directly beneath the IC.
Configure the ATRK pin voltage to program the desired output voltage as described in the TI datasheet and the LMG5126-Q1 EVM user's guide (SNVU923). Use a low-impedance, quiet source for ATRK since output accuracy tracks this reference. For dynamic voltage scaling, slew ATRK slowly enough that the boost loop remains in control; verify transient behavior at minimum and maximum commanded output.
Select the power inductor per the datasheet equations for your output voltage and load: check both RMS current (thermal) and saturation current at maximum load and worst-case input. At 2.5MHz, core loss becomes significant; choose ferrite materials rated for high frequency. Do not exceed the device current limits with excessive capacitance at startup - verify soft-start behavior with your actual output capacitor bank.
合規資訊
Compliance data not present in verified web data; confirm on TI.com product page. Standard grade - for AEC-Q100 use LMG5126QRXRQ1.
