Features and Benefits
- 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
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.
- 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)
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
MAX17017 Companion Parts
Recommended Related Parts
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