LMG5126RXR - 2.5MHz Wide-Input Boost Converter | Texas Instruments
MPN: LMG5126RXR ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LMG5126RXR Overview
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.
Drop-in alternatives for LMG5126RXR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LMG5126RXR (same form factor and footprint) — differing in Qualification, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LMG5126QRXRQ1
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LMG5126VBTR
✅ Drop-In📋 Reference alternative (not in catalog)
LMG5126RXR Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Boost (step-up) |
| Switching Frequency | 2.5 MHz (fixed, PWM) |
| Output Voltage | 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 |
| Mounting Type | Surface Mount |
| Qualification | Standard grade (see LMG5126-Q1 for automotive) |
LMG5126RXR standard Pin Configuration Guide
Pin configuration for LMG5126RXR (standard package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LMG5126RXR.
Refer to the datasheet for full pin configuration.
Typical Applications
LMG5126RXR is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for LMG5126RXR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- ATRK-based output tracking enables dynamic voltage scaling (vs TPS610981DSET)
- Automotive drop-in migration path (vs LMG5126QRXRQ1)
- Integrated high-side and low-side MOSFETs (synchronous rectification) (vs Diode-rectified boost alternatives (e.g., TPS61160 class))
Design Notes
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.
Compliance Information
Compliance data not present in verified web data; confirm on TI.com product page. Standard grade - for AEC-Q100 use LMG5126QRXRQ1.
