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Switching Regulator - Switching Regulators 
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MAX17017
Quad-Output Controller for Low-Power Architecture
Highly Integrated Voltage Controller for Four Output-Voltage Regulators in a 6mm x 6mm Package
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.5 |
| VIN (V) (max) | 28 |
| VOUT1 (V) (min) | 0.75 |
| VOUT1 (V) (max) | 6.3 |
| IOUT1 (A) (max) | 5 |
| Switch Type | External Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Dyn. REF In Preset Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 3 |
| Switching Frequency (kHz) | 1000 |
| Package/Pins | TQFN/48 |
| Budgetary Price (See Notes) | 4.08 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Quad-Output Controller for Low-Power Architecture | Sep 02, 2009 |
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Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 5.5 |
| VIN (V) (max) | 28 |
| VOUT1 (V) (min) | 0.75 |
| VOUT1 (V) (max) | 6.3 |
| IOUT1 (A) (max) | 5 |
| Switch Type | External Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Dyn. REF In Preset Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 3 |
| Switching Frequency (kHz) | 1000 |
| Package/Pins | TQFN/48 |
| Budgetary Price (See Notes) | 4.08 |
Key Features
- Fixed-Frequency, Current-Mode Controllers
- 5.5V to 28V Input Range (Step-Down) or 3V to 5V Input Range (Step-Up)
- 1x Step-Up or Step-Down Controller
- 1x Internal 5AP-P Step-Down Regulator
- 1x Internal 3AP-P Step-Down Regulator
- 1x 2A Source/Sink Linear Regulator with Dynamic REFIN
- Internal BST Diodes
- Internal 5V, 50mA Linear Regulator
- Fault Protection—Undervoltage, Overvoltage, Thermal, Peak Current Limit
- Independent Enable Inputs and Power-Good Outputs
- Voltage-Controlled Soft-Start
- High-Impedance Shutdown
- 10µA (typ) Shutdown Current
Applications/Uses
- 1-to-4 Li+ Cell Battery-Powered Devices
- Low-Power Architecture
- Notebook and Subnotebook Computers
- PDAs and Mobile Communication
- Portable Gaming
- Ultra-Mobile PC (UMPC)
Description
The MAX17017 is a quad output controller for ultra-mobile portable computers (UMPCs) that rely on a low-power architecture. The MAX17017 provides a compact, low-cost controller capable of providing four independent regulators—a main stage, a 3AP-P internal step-down, a 5AP-P internal step-down, and a 2A source/sink linear regulator.
The main regulator can be configured as either a step-down converter (for 2 to 4 Li+ cell applications) or as a step-up converter (for 1 Li+ cell applications). The internal switching regulators include 5V synchronous MOSFETs that can be powered directly from a single Li+ cell or from the main 3.3V/5V power stages. Finally, the linear regulator is capable of sourcing and sinking 2A to support DDR termination requirements or to generate a fixed output voltage.
The step-down converters use a peak current-mode, fixed-frequency control scheme—an easy to implement architecture that does not sacrifice fast-transient response. This architecture also supports peak current-limit protection and pulse-skipping operation to maintain high efficiency under light-load conditions.
Separate enable inputs and independent open-drain power-good outputs allow flexible power sequencing. A soft-start function gradually ramps up the output voltage to reduce the inrush current. Disabled regulators enter high-impedance states to avoid negative output voltage created by rapidly discharging the output through the low-side MOSFET. The MAX17017 also includes output undervoltage, output overvoltage, and thermal-fault protection.
The MAX17017 is available in a 48-pin, 6mm x 6mm Thin QFN package.
The main regulator can be configured as either a step-down converter (for 2 to 4 Li+ cell applications) or as a step-up converter (for 1 Li+ cell applications). The internal switching regulators include 5V synchronous MOSFETs that can be powered directly from a single Li+ cell or from the main 3.3V/5V power stages. Finally, the linear regulator is capable of sourcing and sinking 2A to support DDR termination requirements or to generate a fixed output voltage.
The step-down converters use a peak current-mode, fixed-frequency control scheme—an easy to implement architecture that does not sacrifice fast-transient response. This architecture also supports peak current-limit protection and pulse-skipping operation to maintain high efficiency under light-load conditions.
Separate enable inputs and independent open-drain power-good outputs allow flexible power sequencing. A soft-start function gradually ramps up the output voltage to reduce the inrush current. Disabled regulators enter high-impedance states to avoid negative output voltage created by rapidly discharging the output through the low-side MOSFET. The MAX17017 also includes output undervoltage, output overvoltage, and thermal-fault protection.
The MAX17017 is available in a 48-pin, 6mm x 6mm Thin QFN package.
Technical Docs
| Data Sheet | Quad-Output Controller for Low-Power Architecture | Sep 02, 2009 |
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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