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Switching Regulator - Switching Regulators 
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MAX797
Step-Down Controllers with Synchronous Rectifier for CPU Power
We Recommend Improved Performance Devices: MAX1652/MAX1653/MAX1654/MAX1655 for New Designs
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Key Features
Applications/Uses
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 |
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Simplified Block Diagram
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Parameters
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 |
Key Features
- 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
Applications/Uses
- Cell Phones
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
Description
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
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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