Integrated FET 75V, 2A Synchronous Buck Regulator with Internal Compensation and Programmable Frequency
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概要
Description
The RAA211820 is a DC/DC synchronous step-down (Buck) regulator that supports a 4.5V to 75V input voltage range and adjustable output voltage. It can deliver up to continuous 2A of continuous output current with premium load and line regulation performance.
The RAA211820 uses peak-current mode control architecture. Its PWM switching frequency is programmable to provide the best trade-off between transient response and efficiency. It also supports PFM operation and DEM to maximize light load efficiency, in addition to an external bias LDO input to further reduce power dissipation across the load range. The regulator also has an internal loop compensation circuit to reduce the external component count and BOM cost.
The RAA211820 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211820 also offers protection features such as cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection, and thermal shutdown.
特長
- Wide Vin operating range from 4.5V to 75V
- Adjustable Vout from 0.8V to ~90% of Vin
- Up to 2A of continuous output current
- Default 400kHz or adjustable switching frequency from 200kHz to 800kHz
- ±1% load regulation accuracy from -40°C to 125°C, ±0.5% load regulation accuracy at 25°C
- 95μA typical quiescent current
- Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
- PFM operation and DEM at light load with integrated external bias LDO & Power Good indicator
- Cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection and thermal shut down
アプリケーション
アプリケーション
- Up to 75V distributed power supplies & general purposes POL
- Telecommunication base station power supplies
- Power tools
- Surveillance
- Portable mobility/robotic devices
- Industrial power systems
設計・開発
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RAA211820 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 2A Output (QFN version)
The RTKA211820DE0000BU board evaluates the RAA211820 (QFN version), a DC/DC synchronous step-down regulator with programmable switching frequency. The RAA211820...
RAA211820 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 2A Output (HTSSOP version)
The RTKA211820DE0010BU board evaluates the RAA211820 (HTSSOP version), a DC/DC synchronous step-down regulator with programmable switching frequency. The RAA211820...
モデル
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