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LM51521-Q1
Automotive 2.2-MHz wide VIN low IQ synchronous boost controller with disabled bypass mode
Data sheet
LM51521-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C, TA
- Functional Safety-Capable
- Suited for wide operating range automotive battery powered applications
- 3.8-V to 42-V input operating range
- Dynamically programmable VOUT from 5 V to 20 V (protection up to 57 V)
- Minimum boost input 0.8 V when BIAS ≥ 3.8 V
- Bypass operation when VSUPPLY > VLOAD (LM5152 only, see the device comparison table)
- Minimized battery drain
- Shutdown current ≤ 3 µA
- Automatic mode transition
- Battery drain in deep sleep ≤ 11 µA (bypass operation, charge pump off)
- Battery drain in deep sleep ≤ 33 µA (bypass operation, charge pump on)
- BIAS IQ in sleep ≤ 13 µA (skip mode)
- Strong 5-V MOSFET drivers
- Small solution size and low cost
- 2.2-MHz maximum switching frequency
- Internal boot diode
- Constant peak current limit over VIN
- Supports DCR inductor current sensing
- QFN-20 with wettable flanks
- Avoid AM band interference and crosstalk
- Optional clock synchronization
- 100-kHz to 2.2-MHz switching frequency
- Selectable switching mode (FPWM, diode emulation, skip mode)
- EMI mitigation
- Optional programmable spread spectrum
- Lead-less package
- Programmability and flexibility
- Dynamic VOUT tracking
- Dynamic switching frequency programming
- Programmable line UVLO
- Adjustable soft start
- Adaptive dead time
- Boost STATUS indicator
- Integrated protection features
- Cycle-by-cycle peak current limit
- Overvoltage protection
- HB-SW short protection
- Thermal shutdown
The LM5152x-Q1 (LM5152-Q1 and LM51521-Q1) device is a wide input range synchronous boost controller that employs peak current mode control.
Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5152x-Q1 Automotive Low-IQ Synchronous Boost Controller for Start-Stop/Backup Battery Power Supply datasheet (Rev. A) | PDF | HTML | 14 Apr 2022 |
| Functional safety information | LM5152x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 30 Mar 2022 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5152EVM-BST — LM5152 evaluation module for boost controller
The LM5152EVM-BST evaluation module (EVM) showcases the features and performance of the LM5152-Q1 wide input voltage synchronous boost controller, including:
- Low IQ operation
- Internal feedback resistors
- Bypass mode operation when VIN is greater than the VOUT regulation target
- Dynamic output voltage (...)
Reference designs
PMP31011 — 24-W, low-input voltage synchronous boost converter reference design
This reference design uses the LM51521-Q1 boost controller to supply an 8-V, 3-A load and has been optimized to operate from a single-cell supercapacitor at the input. The converter can discharge a supercapacitor as low as 1.0 V to leverage as much stored energy as possible to open a car door in (...)
Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGR) | 20 | Ultra Librarian |
Ordering & quality
Information included:
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- 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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