Calculation tool
LM5125-CALC — LM5125(A) quick start calculator
LM5125(A) quick start calculator helps on design of the power stage, component selection and loop compensation.
Data sheet
LM5125A-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
- 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 1.4mA
- Stacking with interleaved multiphase operation
- Up to 4-phases without external clock
- Switching frequency from 100kHz to 2.2MHz
- Synchronization to external clock (SYNCIN)
- Dynamically selectable switching modes (FPWM, diode emulation)
- Spread spectrum (DRSS)
- Selectable 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
- Power-good indicator
- Programmable VI undervoltage lockout (UVLO)
- Lead-less VQFN-32 package with wettable flanks
The LM5125A-Q1 is a stackable, dual-phase, synchronous boost controller. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. Stack two devices with or without external clock.
Dynamically program VOUT using the analog or digital ATRK/DTRK function. VI is supported down to 2.5V after start-up 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, over 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 | LM5125 A -Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With VOUT Tracking datasheet | PDF | HTML | 26 Sep 2025 |
| Functional safety information | LM5125-Q1, LM5125A-Q1, and LM51251A-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) | PDF | HTML | 09 Sep 2025 |
Design & development
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Evaluation board
LM5125AEVM-BST — LM5125AEVM-BST evaluation module
The LM5125AEVM-BST evaluation module showcases the features and performance of the LM5125A-Q1 wide-input voltage synchronous dual-phase boost controller. This EVM is designed for ease of configuration, enabling the user to evaluate different conditions on the module. The EVM provides 24V/240W (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RHB) | 32 | Ultra Librarian |
Ordering & quality
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- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
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