Design tool
LM51261A-GUI — GUI for LM51261A
GUI for LM51261A
LM51261A-Q1
Automotive, 42V VIN, 2.2MHz single-phase boost controller with VOUT tracking and I2C
Data sheet
LM51261A-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: TA = –40°C to +125°C
- Functional Safety-Capable
- Input voltage 4.5V to 42V
- Minimum 2.5V for V(BIAS) ≥4.5V or VOUT ≥6V
- Output voltage 6V to 60V
- Adjustable by resistor or by I2C in 1V steps
- Adjustable slew rate when programmed by I2C
- 2% accuracy, internal feedback resistors
- Bypass operation for VI > VOUT
- Dynamic output voltage tracking
- Digital PWM tracking (DTRK)
- Analog tracking (ATRK)
- Overvoltage protection (64V, 50V, 35V, 28.5V)
- Low shutdown IQ of 2µA
- Low operating IQ of 1mA
- 3-phase operation with LM51251A-Q1
- Switching frequency from 100kHz to 2.2MHz
- Synchronization to external clock (SYNCIN)
- Dynamically selectable switching modes (FPWM, diode emulation)
- Spread spectrum (DRSS)
- I2C Interface with 8 selectable addresses
- I2C programmable dead time (14ns to 200ns)
- Current sense resistor or DCR sensing
- Average inductor current monitor
- Average input current limit
- Programmable current limit
- Selectable delay time
- nFAULT indicator
- Programmable VI undervoltage lockout (UVLO)
- Lead-less QFN-32 packable with wettable flanks
The LM51261A-Q1 is a synchronous boost controller with I2C interface. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. The device can be stacked in combination with LM51251A-Q1 for 3-phase operation.
Dynamically program VOUT using the analog or digital ATRK/DTRK function or I2C programming. VI is supported down to 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 4.5V. The fixed switching frequency is set between 100kHz and 2.2MHz through a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or diode emulation can be changed during operation.
The implemented protections peak current limit, average input current limit, average inductor current monitor, overvoltage and undervoltage protection, and the thermal shutdown protect the device and the application.
Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5126 1 A-Q1, Wide-VIN, Single-Phase, Boost Controller with VOUT Tracking and I2C datasheet | PDF | HTML | 26 Nov 2025 |
| Functional safety information | LM5126A-Q1 and LM51261A-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 24 Oct 2025 |
Design & development
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Evaluation board
LM5126AEVM-BST — LM5126A evaluation module
The LM5126AEVM-BST evaluation module showcases the features and performance of the LM5126A-Q1 wide input voltage synchronous boost controller. This EVM is designed for ease of configuration, enabling the user to evaluate different conditions on the module. The standard configuration is designed to (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RHB) | 32 | Ultra Librarian |
Ordering & quality
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