概要
説明
Support is limited to customers who have already adopted these products.
The ISL62873 is a Single-Phase Synchronous-Buck PWM voltage regulator featuring Intersil's Robust Ripple Regulator (R3) Technology™. The wide 3. 3V to 25V input voltage range is ideal for systems that run on battery or AC-adapter power sources. The ISL62873 is a low-cost solution for applications requiring dynamically selected slew-rate controlled output voltages. The soft-start and dynamic setpoint slew-rates are capacitor programmed. Voltage identification logic-inputs select two resistor-programmed setpoint reference voltages that directly set the output voltage of the converter between 0. 5V to 1. 5V, and up to 3. 3V using a feedback voltage divider. Optionally, an external reference such as the DAC output from a microcontroller, can be used by either IC to program the setpoint reference voltage, and still maintain the controlled slew-rate features. Robust integrated MOSFET drivers and Schottky bootstrap diode reduce the implementation area and lower component cost. Intersil's R3 Technology™ combines the best features of both fixed-frequency and hysteretic PWM control. The PWM frequency is 300kHz during static operation, becoming variable during changes in load, setpoint voltage, and input voltage when changing between battery and AC-adapter power. The modulators ability to change the PWM switching frequency during these events in conjunction with external loop compensation produces superior transient response. For maximum efficiency, the converter automatically enters diode-emulation mode (DEM) during light-load conditions such as system standby.
特長
- Input Voltage Range: 3.3V to 25V
- Output Voltage Range: 0.5V to 3.3V
- Output Load up to 30A
- Flexible Output Voltage Programmability
- 1-Bit VID Selects Two Independent Setpoint Voltages
- Simple Resistor Programming of Setpoint Voltages
- Accepts External Setpoint Reference such as DAC
- ±0.75% System Accuracy: -10°C to +100°C
- One Capacitor Programs Soft-start and Setpoint Slew-rate
- Fixed 300kHz PWM Frequency in Continuous Conduction
- External Compensation Affords Optimum Control Loop Tuning
- Automatic Diode Emulation Mode for Highest Efficiency
- Integrated High-current MOSFET Drivers and Schottky Boot-Strap Diode for Optimal Efficiency
- Choice of Overcurrent Detection Schemes
- Lossless Inductor DCR Current Sensing
- Precision Resistive Current Sensing
- Power-Good Monitor for Soft-Start and Fault Detection
- Fault Protection
- Undervoltage
- Overcurrent (DCR-Sense or Resistive-Sense Capability)
- Over-Temperature Protection
- Fault Identification by PGOOD Pull-Down Resistance
- Pb-Free (RoHS compliant)
製品比較
アプリケーション
アプリケーション
- Mobile PC Graphical Processing Unit VCC Rail
- Mobile PC I/O Controller Hub (ICH) VCC Rail
- Mobile PC Memory Controller Hub (GMCH) VCC Rail
- Built-In Voltage Margin for System-Level Test
ドキュメント
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分類 | タイトル | 日時 |
データシート | PDF 1021 KB | |
カタログ | PDF 5.63 MB 英語 | |
EOL通知 | PDF 319 KB | |
EOL通知 | PDF 200 KB | |
製品変更通知 | PDF 294 KB | |
アプリケーションノート | PDF 509 KB | |
アプリケーションノート | PDF 397 KB | |
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設計・開発
モデル
ECADモデル
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