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
説明
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.
パラメータ
| 属性 | 値 |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 4.5 |
| Input Voltage (Max) [Rail 1] | 60 |
| Output Voltage (Min) [Rail 1] (V) | 0.8 |
| Output Voltage (Max) [Rail 1] (V) | 55 |
| Output Current (Max) [Rail 1] (A) | 5 |
| Switching Frequency Range (Typical) (kHz) | 200 - 2500 |
| Control Type | COT |
| Peak Efficiency (%) | 90 |
| IQ [Rail 1] (µA) | 10 |
| SYNCH Capability | No |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +125°C |
パッケージオプション
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| QFN | 5.0 x 4.0 x 0.90 | 28 | 0.5 |
アプリケーション・ブロック図
 | ヒューマノイド用バッテリマネジメントシステム 安全なリアルタイムの電力管理、保護機能、およびバッテリ状態制御を実現する、ヒューマノイドロボット向け統合BMS。 |
 | 磁気浮上 (Maglev) コンベヤシステム 非接触型磁気浮上コンベヤは、スマートファクトリにおいて、正確な位置追従、同期動作、および効率的な電力供給を実現します。 |
その他アプリケーション
- Industrial power supplies
- 48V industrial and computing PoL
- Battery powered applications
- ATM, vending, and gaming machines
- Robotics
- Programmable logic controllers
- After-market automotive
