MAX774：-5V/-12V/-15V或可调、高效率、低IQ、反相、DC-DC控制器
负压LCD偏置电源，可产生极高的负电源电压，输出电流高达1A
The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break-down voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.
关键特性
| 功能框图 产品应用
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关键参数
| Part Number | VIN (V) | VIN (V) | VOUT1 (V) | VOUT1 (V) | Preset VOUT (V) | IOUT1 (A) | Output Adjust. Method | DC-DC Outputs | Oper. Freq. (kHz) | Switch Type | Package/Pins | Budgetary Price | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | max | See Notes | ||||||||||
| MAX774 | 3 | 16.5 | 0 | -100 | -5.0 | 1 | Resistor | 1 | 300 | External |
| $2.42 @1k | |||
| MAX775 | -12 |
| $2.42 @1k | ||||||||||||
| MAX776 | -15 |
| $2.37 @1k | ||||||||||||
数据手册DataSheet
| 英文 | MAX774-MAX776.pdf | Rev 2; 04/2003 |
开发工具
技术资料
- High-Power LED Driver Accepts Wide Input-Voltage Range
- DC-DC Switch-Mode Power-Supply Controller Drives Regulated Charge Pump
质量和环境数据
订购型号
| 型号 | 状况 | 推荐替代产品 | 封装 | 温度 | RoHS/无铅 |
|---|---|---|---|---|---|
| MAX774C/D | 停止供货 | DICE SALES,；NA引脚；DICE； | 参考数据资料 | ||
| MAX774CPA | 生产中 | PDIP(N),；8引脚；79.7mm² | 0°C至+70°C | RoHS/无铅：否 | |
| MAX774CPA+ | 生产中 | PDIP(N),；8引脚；79.7mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX774CSA | 最后一次购买 | MAX774CSA+ | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX774CSA+ | 生产中 | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX774CSA+T | 生产中 | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX774CSA-T | 停止供货 | MAX774CSA+T | N.SO；8引脚 | 0°C至+70°C | 参考数据资料 |
| MAX774EPA | 停止供货 | MAX774EPA+ | PDIP(N),；8引脚；79.7mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX774EPA+ | 生产中 | PDIP(N),；8引脚；79.7mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX774ESA | 最后一次购买 | MAX774ESA+ | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| 型号 | 状况 | 推荐替代产品 | 封装：类型 引脚 占位面积封装图 编码/变更 * | 温度 | RoHS/无铅？ |
| MAX774ESA+ | 生产中 | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX774ESA+T | 生产中 | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX774ESA-T | 最后一次购买 | MAX774ESA+T | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX774MJA | 生产中 | CDIP(N),；8引脚；82.6mm² | -55°C至+125°C | RoHS/无铅：否 |
- MAX774-MAX776.pdf MAX776
