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 programed 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.

特長

  • 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

アプリケーション

  • Industrial power supplies
  • 48V industrial and computing PoL
  • Battery powered applications
  • ATM, vending, and gaming machines
  • Robotics
  • Programmable logic controllers
  • After-market automotive

tune製品選択

製品名 Part Status Pkg. Type Carrier Type MOQ 購入/サンプル
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability

descriptionドキュメント

タイトル language 分類 形式 サイズ 日付
データシート
star RAA211651 Datasheet データシート PDF 3.06 MB
ユーザーガイド、マニュアル
RAA211651 Internal Compensation Mode Design Calculator マニュアル-ハードウェア XLSX 651 KB

memoryボード&キット

製品名 タイトル 分類 会社名
RTKA211651DE0000BU 60V 5A Integrated Buck Regulator Evaluation Board with Constant On Time Modulating Scheme Evaluation Renesas