Design tool
LMR51635-CALC — LMR51635 buck converter quick start design calculator
LMR51635 buck converter quick start design calculator
LMR51635
SIMPLE SWITCHER® synchronous buck converter with 4.3V-to-60V, 3.5A and low quiescent current
Data sheet
LMR51635
- Functional Safety-Capable
- Configured for rugged industrial applications:
- 4.3V to 60V input voltage range
- 2.5A or 3.5A continuous output current
- Low operating quiescent current of 29µA
- 70ns minimum switching on time
- 400kHz amd 1.1MHz switching frequency
- Frequency spread spectrum (PFM variant)
- –40°C to 150°C junction temperature range
- 96% maximum duty cycle
- Monotonic start-up with prebiased output
- Short-circuit protection with hiccup mode
- Precision enable
- ±1% tolerance voltage reference
- Small design size and ease of use:
- Integrated synchronous rectification
- Internal compensation for ease of use
- SOT-23 package
- Various options in pin-to-pin compatible package
- PFM and forced PWM (FPWM) options
- Create a custom design using the LMR516x5 with the WEBENCH Power Designer
The LMR516x5 is a wide-VIN, easy-to-use, synchronous buck converter capable of driving up to 2.5A or 3.5A load current. With a wide input range of 4.3V to 60V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.
The LMR516x5 operates at 400kHz or 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The device has a pulse frequency modulation (PFM version) to realize high efficiency at light load and a forced pulse width modulation (PFM version) to achieve constant frequency and small output voltage ripple over the full load range, soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.
The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.
Technical documentation
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View all 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMR516x5 4.3V to 60V, 2.5A / 3.5A, Synchronous, Buck Converter With Low IQ datasheet (Rev. B) | PDF | HTML | 23 Jan 2025 |
| EVM User's guide | LMR51635 Buck Evaluation Module (Rev. A) | PDF | HTML | 14 Nov 2024 | |
| Functional safety information | LMR51625 and LMR51635 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 15 Oct 2024 |
Design & development
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Evaluation board
LMR51635EVM — LMR51635 evaluation module
The Texas Instruments LMR51635EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMR51635 wide-input synchronous buck regulator. The LMR51635 is a wide-VIN, easy-to-use synchronous buck converter. With the wide operating input voltage range of 4.3V to 60V, the (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23-THN (DDC) | 6 | Ultra Librarian |
Ordering & quality
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