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主要特征
应用/用途
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4 |
| VIN (V) (max) | 11.5 |
| VOUT1 (V) (min) | 1.3 |
| VOUT1 (V) (max) | 11.5 |
| IOUT1 (A) (max) | 0.225 |
| Switch Type | Internal |
| Preset VOUT (V) | 3.3 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Package/Pins | PDIP/8 SOIC (N)/8 |
| Budgetary Price (See Notes) | 3.76 |
缩小
简化框图
Technical Docs
| 数据资料 | 5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器 | Sep 07, 2005 |
支持和培训
采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后，所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站，请创建一个新帐户。有关此样片网站的任何问题，请联系SampleSupport@analog.com。
参量
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4 |
| VIN (V) (max) | 11.5 |
| VOUT1 (V) (min) | 1.3 |
| VOUT1 (V) (max) | 11.5 |
| IOUT1 (A) (max) | 0.225 |
| Switch Type | Internal |
| Preset VOUT (V) | 3.3 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Package/Pins | PDIP/8 SOIC (N)/8 |
| Budgetary Price (See Notes) | 3.76 |
主要特征
- High Efficiency for a Wide Range of Load Currents
- 10µA Quiescent Current
- Output Currents Up to 225mA
- Preset or Adjustable Output Voltage:
- 5.0V (MAX639)
- 3.3V (MAX640)
- 3.0V (MAX653)
- Low-Battery Detection Comparator
- Current-Limiting PFM Control Scheme
应用/用途
- 5V至3.3V转换
- 9V电池至5V、3.3V或3V转换
- 替代高效线性稳压器
- 便携式仪表与手持终端
描述
The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.
The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.
The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.
The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.
The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.
Technical Docs
| 数据资料 | 5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器 | Sep 07, 2005 |
支持和培训
采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后，所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站，请创建一个新帐户。有关此样片网站的任何问题，请联系SampleSupport@analog.com。
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