MAX1714

High-Speed Step-Down Controller for Notebook Computers

Low-Cost, Ultra-Fast, 1%-Accurate Controllers Power Next-Generation Notebook CPU Core and I/O

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Overview

Features and Benefits
Product Details

Features and Benefits

Ultra-High Efficiency
No Current-Sense Resistor (Lossless I_LIMIT)
Quick-PWM with 100ns Load-Step Response
1% V_OUT Accuracy Over Line and Load
2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output Range
2V to 28V Battery Input Range
200/300/450/600kHz Switching Frequency
Overvoltage Protection (MAX1714A)
Undervoltage Protection
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
2V ±1% Reference Output
Power-Good Indicator

Product Details

The MAX1714 pulse-width modulation (PWM) controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core or chip-set/RAM supplies in notebook computers.

Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1714 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous-rectifier MOSFETs.

Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1714 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 1V. The MAX1714A is available in a 20-pin QSOP package and includes overvoltage protection. The MAX1714B is available in a 16-pin QSOP package with no overvoltage protection. For applications requiring VID compliance or DAC control of output voltage, refer to the MAX1710/MAX1711 data sheet. For a dual output version, refer to the MAX1715 data sheet.

Applications

1.8V and 2.5V I/O Supplies
Chipset/RAM Supplies as Low as 1V
CPU Core Supplies
Notebook Computers

Product Categories

Power Management
- External Power Switch Buck Controllers
- Micropower Buck Regulators

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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.

Evaluation Kits (2)

MAX1714BEVKIT

Evaluation Kit for the MAX1714B

MAX1714AEVKIT

Evaluation Kit for the MAX1714A

MAX1714BEVKIT

View Detailed Evaluation Kit Information

The MAX1714B evaluation kit (EV kit) demonstrates a standard 4A application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage rail for use as chipset, dynamic random-access memory (DRAM), and other low-voltage supplies.

The MAX1714B EV kit provides a 2.5V output voltage from a +4.5V to +24V battery input range. It delivers up to 4A output current with greater than 90% efficiency while operating at a 300kHz switching frequency, and has superior line- and load-transient response.

This EV kit is a fully assembled and tested circuit board. It also allows evaluation of other output voltages in the 1.0V to 5.5V range by changing feedback resistors R1 and R2.

Applications

1.8V and 2.5V I/O Supplies
Chipset/RAM Supplies as Low as 1V
CPU Core Supplies
Notebook Computers

Features & Benefits

+4.5V to +24V Input Voltage Range
Preset 2.5V Output Voltage
1.0V to 5.5V Adjustable Output
4A Output Current
94% Efficient (V_OUT = 2.5V, V_BATT = 7V, I_LOAD = 2A)
300kHz Switching Frequency
No Current-Sense Resistor
Power-Good Output
16-Pin QSOP Package
Low-Profile Components
Fully Assembled and Tested

MAX1714AEVKIT

View Detailed Evaluation Kit Information

The MAX1714A evaluation kit (EV kit) demonstrates a standard 4A application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage rail for use as chipset, DRAM, and other low-voltage supplies. For higher current applications up to 12A, refer to the MAX1714A data sheet.

The MAX1714A EV kit provides a 2.5V output voltage from a +5V to +24V battery input range. It delivers up to 4A output current with greater than 90% efficiency while operating at a 300kHz switching frequency, and has superior line- and load-transient response.

This EV kit is a fully assembled and tested circuit board. It also allows evaluation of other output voltages in the 1.0V to 5.5V range by changing feedback resistors R1 and R2.

Applications

1.8V and 2.5V I/O Supplies
Chipset/RAM Supplies as Low as 1V
CPU Core Supplies
Notebook Computers

Features & Benefits

+5V to +24V Input Voltage Range
Preset 2.5V Output Voltage
1.0V to 5.5V Adjustable Output
4A Output Current
94% Efficient (V_OUT = 2.5V, V_BATT = 7V, I_LOAD= 2A)
300kHz Switching Frequency
No Current-Sense Resistor
Power-Good Output
Low-Profile Components
Fully Assembled and Tested

Documentation & Resources

Data Sheets

MAX1714-MAX1714B: High-Speed Step-Down Controller for Notebook Computers Data Sheet (Rev. 2)
9/16/2005
PDF

Reliability Data

MAX1714 Reliability Data
1/12/2023
PDF

Design Notes

Thermistor Linearizes Current Limit
3/17/2006

Design Resources

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 Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX1714AEEP+	Material Declaration	Reliability Data	20-QSOP-150_MIL	Ultra Librarian SamacSys
MAX1714AEEP+T	Material Declaration	Reliability Data	20-QSOP-150_MIL	Ultra Librarian SamacSys
MAX1714BEEE+	Material Declaration	Reliability Data	16-QSOP-150_MIL	Ultra Librarian SamacSys
MAX1714BEEE+T	Material Declaration	Reliability Data	16-QSOP-150_MIL	Ultra Librarian SamacSys
Wafer Fabrication Data		MAX1714 Reliability Data

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