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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) | 40 |
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) | 6.21 |
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Technical Docs
数据资料 | 高压、同步整流、降压型控制器,用于CPU电源 | Jul 01, 1997 |
参量
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) | 4.5 |
VIN (V) (max) | 40 |
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) | 6.21 |
主要特征
- 96% Efficiency
- Up to 40V Power Input
- 2.5V to 6V Adjustable Output
- Preset 3.3V and 5V Outputs (at up to 10A)
- 5V Linear-Regulator Output
- Precision 2.505V Reference Output
- Automatic Bootstrap Circuit
- 150kHz/300kHz Fixed-Frequency PWM Operation
- Programmable Soft-Start
- 375µA Quiescent Current (VIN = 12V, VOUT = 5V)
- 1µA Shutdown Current
应用/用途
- 工业控制
- 笔记本电脑和亚笔记本电脑
描述
The MAX797H high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. A 40V rating on the power stage's input allows operation with high-cell-count batteries and a wide range of AC adapters. This buck controller achieves 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 MAX797H 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 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 MAX797H is pin compatible with the popular MAX797, but has a higher input voltage range.
The MAX797H comes in a 16-pin narrow SO package.
The MAX797H 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 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 MAX797H is pin compatible with the popular MAX797, but has a higher input voltage range.
The MAX797H comes in a 16-pin narrow SO package.
Technical Docs
数据资料 | 高压、同步整流、降压型控制器,用于CPU电源 | Jul 01, 1997 |