Features and Benefits
- 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
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.
- Industrial Controls
- Notebook and Subnotebook Computers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX797H Companion Parts
Recommended Related Parts
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