Overview
Description
The RAA211651 is an integrated 60V, 5A synchronous buck regulator with the Constant On-Time (COT) control scheme. It supports a wide range of input voltage from 4.5V to 60V and adjustable output voltage (0.8V to maximum duty cycle * VIN). It also features a very low quiescent current, typically 10μA at 24V input. The modulation scheme used allows for high efficiency at all output load levels, especially at light-load conditions.
The RAA211651 is based on the COT modulator, where the on-time is determined by the input voltage level and the resistor connected to the SET pin. The switching frequency varies with the load. At light load, switching frequency drops reducing the switching losses. Also, with internal compensation, the regulator works in Diode Emulation mode reducing the losses at light-load conditions.
To limit inrush current during startup the RAA211651 has 2ms fixed internal soft-start time. It can also be programmed by an external capacitor. The RAA211651 also provides programmable startup delay time for sequencing purposes.
The RAA211651 provides comprehensive protections including undervoltage lockout, overcurrent (positive and negative), overvoltage, and over-temperature protections.
Features
- 4.5V to 60V input supply range
- 0.8V reference voltage with 1% accuracy
- Adjustable output voltage (0.8V to Dmax*VIN)
- Modulator: Constant On-Time (COT)
- Low quiescent current
- Excellent line and load regulation
- Selectable internal or external control loop compensation
- Variable load dependent switching frequency
- Output Power-Good (PG) indicator
- Programmable and optional fixed 2ms soft-start and soft-stop feature
- Programmable startup and shutdown delay
- Integrated LDO with bypass capability allowing for high-efficiency operation
- Full protection: High-Side Overcurrent (HSOC) and low-side current protections in both directions, output Overvoltage Protection (OVP) and Output Undervoltage Protection (OUVP), input Undervoltage Lockout (UVLO), and Over-Temperature Protection (OTP)
- Optional 3.3V default VOUT using internal feedback
- 28 Ld 4mmx5mm QFN package
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 3.06 MB | |
| Brochure | PDF 12.71 MB 日本語 | |
| Manual - Hardware | PDF 11.99 MB | |
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Design & Development
Software & Tools
Boards & Kits
Evaluation
RTKA211651DE0000BU
Active
RAA211651 Synchronous Buck Evaluation Board with 4.5V to 60V Input Range, 3.3V 5A Output
The RAA211651 is an integrated 60V, 5A synchronous buck regulator with constant on time modulating scheme. It supports a wide input voltage range from 4.5V to 60V and adjustable output voltage. The RAA211651 is offered in a 28Ld QFN package. The RTKA211651DE0000BU evaluation board provides a...
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Development
QCIOT-5APWRPOCZ
Active
60V 5A Buck Regulator with DPM QuickConnect IoT Board
The QCIOT-5APWRPOCZ board enables quick prototyping of the RAA211651 60V 5A low quiescent current integrated switching regulator with the ISL28023 precision digital power monitor (DPM). The ISL28023 DPM is designed to measure and control the regulator output of the RAA211651 with margining.
The...
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Models
ECAD Models
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