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Switching Regulators 
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MAX786, MAX786R, MAX786S
Dual-Output Power Supply Controller for Notebook Computers
Dual-Output 3.3V and 5V Notebook Power Supply Provide Up to 50W with >90% Efficiency
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The MAX786 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-battery-detection comparators.
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.
Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.
Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.
Key Features
- Dual PWM Buck Controllers (+3.3V and +5V)
- Two Precision Comparators or Level Translators
- 95% Efficiency
- 420µA Quiescent Current, 70µA in Standby (linear regulators alive)
- 25µA Shutdown Current (+5V linear alive)
- 5.5V to 30V Input Range
- Small SSOP Package
- Fixed Output Voltages:
- 3.3V (standard)
- 3.45V (High-Speed Pentium®)
- 3.6V (PowerPC®)
Applications/Uses
- Communication Systems
- Notebook Computers
- Pen-Entry Systems
- Portable Data Terminals
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 3.3 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 5 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 2 |
| Switching Frequency (kHz) | 300 |
| Package/Pins | SSOP/28 |
| Budgetary Price (See Notes) | $5.84 @1k |
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Technical Docs
| Data Sheet | Dual-Output Power Supply Controller for Notebook Computers | Jan 01, 1999 |
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Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.5 |
| VIN (V) (max) | 30 |
| VOUT1 (V) (min) | 3.3 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 5 |
| Switch Type | External |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 2 |
| Switching Frequency (kHz) | 300 |
| Package/Pins | SSOP/28 |
| Budgetary Price (See Notes) | $5.84 @1k |
Key Features
- Dual PWM Buck Controllers (+3.3V and +5V)
- Two Precision Comparators or Level Translators
- 95% Efficiency
- 420µA Quiescent Current, 70µA in Standby (linear regulators alive)
- 25µA Shutdown Current (+5V linear alive)
- 5.5V to 30V Input Range
- Small SSOP Package
- Fixed Output Voltages:
- 3.3V (standard)
- 3.45V (High-Speed Pentium®)
- 3.6V (PowerPC®)
Applications/Uses
- Communication Systems
- Notebook Computers
- Pen-Entry Systems
- Portable Data Terminals
Description
The MAX786 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-battery-detection comparators.
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.
Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.
High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.
Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.
Technical Docs
| Data Sheet | Dual-Output Power Supply Controller for Notebook Computers | Jan 01, 1999 |
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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