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主要特征
应用/用途
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 2.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 1.5 |
| VOUT1 (V) (max) | 1.8 |
| IOUT1 (A) (max) | 0.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 1.5 1.8 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 1200 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 1.99 |
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参量
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 2.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 1.5 |
| VOUT1 (V) (max) | 1.8 |
| IOUT1 (A) (max) | 0.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 1.5 1.8 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 1200 |
| Package/Pins | SOT23/5 |
| Budgetary Price (See Notes) | 1.99 |
主要特征
- 250mA Guaranteed Output Current
- Synchronous Rectifier for Over 90% Efficiency
- Tiny 5-Pin SOT23 Package
- 40µA Quiescent Supply Current
- 0.01µA Logic-Controlled Shutdown
- Up to 1.2MHz Switching Frequency
- Fixed 1.8V or 1.5V Outputs (MAX1734)
- Adjustable Output Voltage (MAX1733)
- ±1.5% Initial Accuracy
- 2.7V to 5.5V Input Range
- Soft-Start Limits Startup Current
应用/用途
- 蜂窝电话
- 计算机：台式机、工作站和服务器
- 消费类音频
- 数码相机
- 全球定位系统(GPS)
- 掌上电脑
- POS终端
- 无线数据
- 无线局域网(WLAN)
描述
The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications.
Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.
Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.
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