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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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Overview

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 3A_P-P internal step-down, a 5A_P-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.

MAX17017: Standard Application Circuit

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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 5A_P-P Step-Down Regulator
1x Internal 3A_P-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)

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

Power Good Signal

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX17017

5.5

0.75

6.3

Dyn. REF In

Preset

Resistor

External

Internal

Yes

1000

TQFN/48

$3.67 @1k

See All Step-Down Switching Regulators (380)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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