Application software & framework
LM5125-DESIGN — LM5125 design resources
This resource includes the preliminary calculator and GUIs for LM5125, LM51251, LM5126 and LM51261
Data sheet
LM5125-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 typ. (5µA maximum)
- Low operating IQ of 1.4mA typ. (2mA maximum)
- 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 (18ns 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 LM5125-Q1 is a stackable, multiphase, 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. Two devices can be stacked with or without external clock.
VOUT can be dynamically programmed using the digital or analog ATRK/DTRK function. VI can be as low as 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, or the thermal shutdown protect the device and the application.
Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5125-Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With VOUT Tracking datasheet | PDF | HTML | 02 Dec 2024 |
| Functional safety information | LM5125-Q1, LM51251-Q1 Functional Safety FIT, FMD and Pin FMA | PDF | HTML | 13 Nov 2024 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5125EVM-BST — LM5125 evaluation module
The LM5125 evaluation module showcases the features and performance of the LM5125-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 standard configuration is designed (...)
Calculation tool
LM5125-CALC — LM5125 quick start calculator
LM5125 quick start calculator helps on design of the power stage, component selection and loop compensation.
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RHB) | 32 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
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