MAX797
PRODUCTIONStep-Down Controllers with Synchronous Rectifier for CPU Power
We Recommend Improved Performance Devices: MAX1652/MAX1653/MAX1654/MAX1655 for New Designs
- Part Models
- 6
- 1ku List Price
- Starting From $9.64
Overview
- 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
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.
Applications
- Cell Phones
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
Documentation
Data Sheet 1
Technical Articles 3
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 |
|---|---|---|---|
| MAX797CSE+ | Small-Outline IC Narrow (0.15in) | ||
| MAX797CSE+T | Small-Outline IC Narrow (0.15in) | ||
| MAX797ESE+ | Small-Outline IC Narrow (0.15in) | ||
| MAX797ESE+T | Small-Outline IC Narrow (0.15in) | ||
| MAX797ESE/GG8 | Small-Outline IC Narrow (0.15in) | ||
| MAX797MJE | Ceramic Dual-In-Line, Narrow (0.3in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX797CSE+T | PRODUCTION | |
| MAX797ESE+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 1 | ||
| MAX1652 | Obsolete | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
Evaluation Kits
Evaluation Kit for the MAX797
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