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主要特征
应用/用途
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 2.5 |
| VOUT1 (V) (max) | 6 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 340 |
| Package/Pins | SOIC (N)/16 |
| Budgetary Price (See Notes) | 6.2 |
缩小
简化框图
Technical Docs
| 数据资料 | 同步整流降压型控制器，用于CPU电源 | Oct 10, 2005 | |
| 应用笔记 | Synchronous Buck-Regulator Output Terminates High-Speed Data Buses | ||
| 应用笔记 | 电池充电器以大于96%的效率提供2.5A电流\r\n |
参量
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 2.5 |
| VOUT1 (V) (max) | 6 |
| IOUT1 (A) (max) | 10 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 340 |
| Package/Pins | SOIC (N)/16 |
| Budgetary Price (See Notes) | 6.2 |
主要特征
- 96% Efficiency
- 4.5V to 30V Input Range
- 2.5V to 6V Adjustable Output
- Preset 3.3V and 5V Outputs (at up to 10A)
- Multiple Regulated Outputs
- +5V Linear-Regulator Output
- Precision 2.505V Reference Output
- Automatic Bootstrap Circuit
- 150kHz/300kHz Fixed-Frequency PWM Operation
- Programmable Soft-Start
- 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V)
- 1µA Typ Shutdown Current
应用/用途
- 蜂窝电话
- 笔记本电脑和亚笔记本电脑
- PDA与移动通信
描述
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.
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.
Technical Docs
| 数据资料 | 同步整流降压型控制器，用于CPU电源 | Oct 10, 2005 | |
| 应用笔记 | Synchronous Buck-Regulator Output Terminates High-Speed Data Buses | ||
| 应用笔记 | 电池充电器以大于96%的效率提供2.5A电流\r\n |
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