MAX797：同步整流降压型控制器，用于CPU电源
对于新设计推荐使用性能更好的器件：MAX1652/MAX1653/MAX1654/MAX1655
The MAX796/MAX797/MAX799 high-performance, step-down DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 96% efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs. The MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs. The MAX797 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. The SKIP-bar override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads. The MAX796/MAX797/MAX799 are all available in 16-pin DIP and narrow SO packages. See the table below to compare these three converters.
关键特性
| MAX796、MAX797、MAX799：典型工作电路 应用
|
数据手册DataSheet
| 语言 | 下载文件 | 备注 |
|---|---|---|
| 英文 | MAX796-MAX799.pdf | Rev 4; 10/2005 |
关键参数
| Part Number | VIN (V) | VIN (V) | VOUT1 (V) | VOUT1 (V) | Preset VOUT (V) | Output Adjust. Method | IOUT1 (A) | Switch Type | Synchronous Switching | DC-DC Outputs | Oper. Freq. (kHz) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | max | See Notes | ||||||||
| MAX797 | 4.5 | 30 | 2.5 | 6 |
|
| 10 | External | Yes | 1 | 340 |
| $5.57 @1k |
| MAX799 |
| - | |||||||||||
开发工具
技术资料
质量和环境数据
相关产品
- MAX1652：高效率、PWM、降压型DC-DC控制器，16引脚QSOP封装
订购型号
| 型号 | 状况 | 推荐替代产品 | 封装 | 温度 | RoHS/无铅 |
|---|---|---|---|---|---|
| MAX797C/D | 停止供货 | DICE SALES,；NA引脚；DICE S； | 0°C至+70°C | 参考数据资料 | |
| MAX797CPE | 停止供货 | PDIP(N),；16引脚；158.4mm² | 0°C至+70°C | RoHS/无铅：否 | |
| MAX797CSE | 停止供货 | MAX797CSE+ | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX797CSE+ | 生产中 | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX797CSE+G068 | 生产中 | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX797CSE+T | 生产中 | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX797CSE+TG068 | 生产中 | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX797CSE-T | 停止供货 | MAX797CSE+T | SOIC(N),；16引脚；61.9mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX797EPE | 停止供货 | MAX797EPE+ | PDIP(N),；16引脚；158.4mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX797ESE | 停止供货 | MAX797ESE+ | SOIC(N),；16引脚；61.9mm² | -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？ |
| MAX797ESE+ | 生产中 | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX797ESE+T | 生产中 | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX797ESE-T | 停止供货 | MAX797ESE+T | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX797ESE/GG8 | 生产中 | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：否 | |
| MAX797ESE/GG8-T | 停止供货 | MAX797ESE+ | N.SO； | -40°C至+85°C | 参考数据资料 |
| MAX797ESE/GH9 | 停止供货 | MAX797ESE+ | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX797ESE/GH9-T | 停止供货 | MAX797ESE+ | SOIC(N),；16引脚；61.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX797MJE | 生产中 | CDIP(N),；16引脚；173.5mm² | -55°C至+125°C | RoHS/无铅：否 |
- MAX796-MAX799.pdf MAX799
- Synchronous Buck-Regulator Output Terminates High-Speed Data Buses MAX4091
- MAX797.pdf MAX797
- 典型工作电路 MAX799
