Overview
Description
The RAA211650 is an integrated 60V, 5A synchronous buck regulator with adjustable switching frequency from 200kHz up to 2.5MHz. It supports a wide input voltage range from 4.5V to 60V and adjustable output voltage (0.8V to maximum duty cycle * VIN). The integrated low rDS(ON) MOSFETs, gate drivers, and the controller make RAA211650 an efficient voltage step-down solution.
The device switches at a default frequency of 500kHz if the RT pin is tied to AVCC, however, it can be programmed to switch from 200kHz to 2.5MHz by using an external resistor on the RT pin. The MODE/SYNC pin can dither the oscillator frequency if the spread-spectrum operation is required. The internal oscillator can also be synchronized to an external clock through the MODE/SYNC pin. The integrated regulator also has options either to use internal fixed compensation or user-selected external compensation.
To limit inrush current during startup, RAA211650 has 2ms fixed internal soft-start time. It can also be programmed by an external capacitor.
The RAA211650 provides programmable startup delay time for sequencing purposes. Also, the RAA211650 provides comprehensive protections including undervoltage lockout, overcurrent (positive and negative), overvoltage, and over-temperature.
Features
- 4.5V to 60V input supply range
- Integrated high-side (90mΩ) and low-side (37mΩ)MOSFETs
- 1% accurate voltage reference over temperature
- Fixed-frequency operation with optional spread spectrum and external clock sync
- Adjustable switching frequency from 200kHz to 2.5MHz
- Programmable soft-start and soft-stop timing
- Programmable startup and shutdown delays
- Bidirectional overcurrent protection on both internal FETs
- Extensive voltage and temperature protection
- Compact 28 Ld 4x5mm QFN package
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 3.32 MB | |
| Brochure | PDF 12.71 MB 日本語 | |
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Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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RAA211650
Hello, everyone!I want to use RAA211650 to design a DCDC step-down circuit. The specifications are as follows: The input voltage：9V-36V，actual use 12V. The output voltage:9V Load current:3A Please check the schematic diagram for me.Now there is a whistling sound when 1A is ...
Sep 6, 2022 -
calculating max switching frequency of RAA211650
Can i use the RAA211650 at max switching frequency and close to max input voltage ? (e.g. 55V and 5V output ?)
Jun 4, 2024 -
[RAA211650] simulation model
Hi, Can I take a simulation model of the RAA211650 from Renesas? I'd like to confirm the operation when no-load and light-load. Best,ACGUY
Jun 2, 2025