MAX1791
PRODUCTIONHigh-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks
- Part Models
- 2
- 1ku List Price
- Starting From $4.87
Overview
- High Operating Frequency (300kHz)
- No Current-Sense Resistor
- Accurate Current Limit
- ±1% Total DC Error over Line and During Continuous Conduction
- Dual Mode Fixed Output
- 1.8V/2.5V/adj (MAX1762)
- 3.3V/5.0V/adj (MAX1791)
- 0.5V to 5.5V Output Adjust Range
- 5V to 20V Input Range
- Automatic Light-Load Pulse Skipping Operation
- Free-Running On-Demand PWM
- Foldback Mode™ UVLO
- PFET/NFET Synchronous Buck
- 4.65V at 25mA Linear Regulator Output
- 5µA Shutdown Supply Current
- 230µA Quiescent Supply Current
- 10-Pin µMAX Package
The MAX1762/MAX1791 PWM step-down controllers provide high efficiency, excellent transient response, and high DC output accuracy needed for stepping down, high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook computers and PDAs.
Maxim's proprietary Quick-PWM™ pulse-width modulator is a free-running constant on-time type with input feed-forward. Its high operating frequency (300kHz) allows small external components to be utilized in PC board area-critical applications such as subnotebook computers and smart phones. PWM operation occurs at heavy loads, and automatic switchover to pulse-skipping operation occurs at lighter loads. The external high-side p-channel and low-side n-channel MOSFETs require no bootstrap components. The MAX1762/MAX1791 are simple, easy to compensate, and do not have the noise sensitivity of conventional fixed-frequency current-mode PWMs.
These devices achieve high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by their ability to drive synchronous-rectifier MOSFETs. The MAX1762/MAX1791 come in a 10-pin µMAX® package and offer two fixed voltages (Dual Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and 3.3V/5.0V/adj (MAX1791).
Applications
- 2-Way Pagers
- Analog Cellular Phones
- Digital Cellular Phones
- Digital Still Cameras
- Notebook 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 |
|---|---|---|---|
| MAX1791EUB+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX1791EUB+T | Micro-MAX, Thin Shrink Small-Outline |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Sep 19, 2018 - 1753N ASSEMBLY |
||
| MAX1791EUB+ | PRODUCTION | |
| MAX1791EUB+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 8 | ||
| MAX1630 | Obsolete | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1631 | NOT RECOMMENDED FOR NEW DESIGNS | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1632 | NOT RECOMMENDED FOR NEW DESIGNS | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1633 | Obsolete | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1634 | NOT RECOMMENDED FOR NEW DESIGNS | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1635 | Obsolete | Multi Output, Low-Noise Power Supply Controllers for Notebook Computers |
| MAX1714 | PRODUCTION | High-Speed Step-Down Controller for Notebook Computers |
| MAX1761 | PRODUCTION | Small, Dual, High-Efficiency Buck Controller for Notebooks |
Evaluation Kits
Evaluation Kit for the MAX1791, MAX1762
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