MAX797H
PRODUCTIONHigh-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power
- Part Models
- 2
- 1ku List Price
- Starting From $9.67
Overview
- 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.
Applications
- Industrial Controls
- Notebook and Subnotebook Computers
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX797HESE+ | Small-Outline IC Narrow (0.15in) | ||
| MAX797HESE+T | Small-Outline IC Narrow (0.15in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX797HESE+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 1 | ||
| MAX1652 | Obsolete | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |