Analog Devices / Maxim Integrated Maxim MAX15062 高効率、高電圧、同期整流ステップダウンコンバータ
Maxim MAX15062高効率、高電圧、同期整流ステップダウンコンバータは、MOSFET内蔵で、4.5V~60Vの入力電圧範囲で動作します。3.3Vで最大300mAの出力電流を供給します。このデバイスは-40℃~+125℃の温度範囲で動作し、小型8ピンTDFNパッケージ(2mm × 2mm)で提供されます。このデバイスは、ピーク電流モード制御方式を採用し、MODEピンを使用してパルス幅変調(PWM)、またはパルス周波数変調(PFM)でデバイスを動作させます。PWM動作は全負荷にわたって一定の周波数動作を提供するため、可変スイッチング周波数に敏感なアプリケーションで役立ちます。PFM動作は、負のインダクタ電流を無効にし、さらに軽負荷時にはパルスをスキップして高効率を実現します。低抵抗のオンチップMOSFETによって、全負荷時の高効率が保証され、PCBレイアウトが簡素化されます。The device employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance on-chip MOSFETs ensure high efficiency at full load and simplify the PCB layout.
特徴
- Eliminates external components and reduces total cost
- No schottky—synchronous operation for high efficiency and reduced cost
- Internal compensation
- Internal feedback divider for fixed 3.3V, 5V output voltages
- Internal soft-start
- All-ceramic capacitors, ultra-compact layout
- Reduces number of DC-DC regulators to stock
- Wide 4.5V to 60V input voltage range
- Fixed 3.3V and 5V output voltage options
- Adjustable 0.9V to 0.89 x VIN output voltage option
- Delivers up to 300mA load current
- Configurable between PFM and forced-PWM modes
- Reduces power dissipation
- Peak efficiency = 92%
- PFM feature for high light-load efficiency
- Shutdown current = 2.2µA (typ)
- Operates reliably in adverse industrial environments
- Hiccup-mode current limit and autoretry startup
- Built-in output voltage monitoring with open-drain active-low RESET pin
- Programmable EN/UVLO threshold
- Monotonic startup into prebiased output
- Overtemperature protection
- -40°C to +125°C Automotive/industrial temperature range
アプリケーション
- 4-20mA Current loops
- General-purpose point-of-load
- High-voltage LDO replacement
- HVAC and building control
- Industrial sensors
- Process control
Block Diagram
Additional Resources
公開: 2014-10-21
| 更新済み: 2023-04-13
