Analog Devices / Maxim Integrated Maxim MAX17552高効率、高電圧、同期整流ステップダウンコンバータ
Maxim MAX17552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、4V~60Vの入力電圧範囲で動作します。このコンバータは、0.8V~0.9 x VINの出力電圧で、最大100mAの出力電流を供給可能です。出力電圧の精度は、-40℃~+125℃の温度範囲にわたって±1.75%以内です。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。このコンバータのPFMモードでの無負荷時消費電流はわずか22µAです。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 ADI MAX17552 and MAX17552B Step-Down Converters employ 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 Step-Down Converters consume only 22µA of no-load supply current in PFM mode. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify PCB layout.
特徴
- Eliminates external components and reduces total cost
- No schottky-synchronous operation for high efficiency and reduced cost
- Internal compensation
- Fixed internal 5.1ms or programmable soft-start
- All-ceramic capacitors, ultra-compact layout
- Reduces number of DC-DC regulators to stock
- Wide 4V to 60V input voltage range
- Adjustable 0.8V to 0.9V VIN output voltages
- Delivers up to 100mA load current
- 100kHz to 2.2MHz Adjustable switching frequency range with external synchronization
- Configurable between PFM and forced-PWM modes
- Reduces power dissipation
- 22µA No load supply current
- Peak efficiency >90%
- PFM feature for high light-load efficiency
- 1.2µA (typ) Shutdown current
- Operates reliably in adverse industrial environments
- Peak current-limit protection
- 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 Industrial/automotive temperature range
アプリケーション
- Industrial sensors and process control
- 4mA to 20mA Current-loop powered sensors
- High-voltage LDO replacement
- Battery-powered equipment
- HVAC and building control
- General-purpose point of load
Typical Application Circuit
View Results ( 5 ) Page
| 部品番号 | データシート | 入力電圧 | 入力電圧-最小 | 出力電流 | 零入力電流 | スイッチング周波数 |
|---|---|---|---|---|---|---|
| MAX17552BATB+T | ![]() |
4 V to 60 V | 4 V | 100 mA | 18 uA | 2.08 MHz |
| MAX17552AATB+T | ![]() |
4 V to 60 V | 4 V | 100 mA | 525 uA | 100 kHz to 2.08 MHz |
| MAX17551ATB+T | ![]() |
4 V to 60 V | 4 V | 50 mA | 22 uA | 2.08 MHz |
| MAX17551AUB+T | ![]() |
4 V to 60 V | 4 V | 50 mA | 22 uA | 2.08 MHz |
| MAX17551AUB+ | ![]() |
4.5 V to 60 V | 4.5 V | 50 mA | 22 uA | 100 kHz to 2.2 MHz |
公開: 2014-10-21
| 更新済み: 2025-09-11

