Automotive 3-V to 65-V, 0.3-A buck converter optimized for size and light load efficiency
Product details
Parameters
Package | Pins | Size
Features
- AEC-Q100-qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C, TA
- Functional Safety-Capable
- >70% efficiency at 5 mA
- 4 µA IQ (switching) at 24 VIN to 3.3 VOUT (fixed output option)
- Miniature solution size and low component cost
- 2-mm × 2-mm HotRod™ package with wettable flanks
- Internal compensation
- Designed for automotive applications:
- Junction temperature range –40°C to +150°C
- Pseudo-random spread spectrum compatible with CISPR 25 EMI standard
- Wide input voltage range: 3.0 V (falling threshold) to 65 V
- Adjustable, 3.3-V and 5-V fixed output voltage options available
- Synchronizable with MODE/SYNC pin variant
- Adjustable FSW: 200 kHz to 2.2 MHz with RT pin variant
- Pin compatible with LMR36506-Q1 (65 V, 600 mA)
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Description
The LMR36503-Q1 is the industry’s smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2-mm x 2-mm HotRod™ package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 3.3 V, 5 V and other adjustable output voltages.
The LMR36503-Q1 uses peak current mode control architecture with internal compensation and maintains stable operation with minimal output capacitance. The wide input operating range of the LMR36503-Q1 helps it remain functional during a deep input voltage sag condition, making it an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503-Q1 provides precise indication of the output voltage status, eliminating the requirement for an external supervisor. A seamless transition from FPWM to PFM, with an ultra-low standby quiescent current allows the LMR36503-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503-Q1 to an external clock. With the right resistor selection, the LMR36503-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503-Q1 is designed to simplify implementation for a wide range of automotive end equipments.
Same functionality and pinout but is not an equivalent to the compared device:
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LMR36503-Q1 3-V to 65-V, 0.3-A Synchronous Buck Converter Optimized for Size datasheet (Rev. B) | Sep. 22, 2020 |
| Selection guide | Buck Converter Quick Reference Guide (Rev. B) | Apr. 08, 2021 | |
| Application note | LMR3650x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | Oct. 26, 2020 | |
| User guide | LMR36506MSCEVM User’s Guide (Rev. A) | May 19, 2020 | |
| Technical article | Optimizing flip-chip IC thermal performance in automotive designs | Dec. 11, 2019 | |
| Technical article | Minimize the impact of the MLCC shortage on your power application | Mar. 29, 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The LMR36506MSCEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR36506-Q1 synchronous step-down converter. The LMR36503-Q1 can also be evaluated with LMR36506MSCEVM.
Features
- Low minimum on-time
- Integrated synchronous rectification
- Low operating quiescent current
- High efficiency at light loads
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
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CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VQFN-HR (RPE) | 9 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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Support & training
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