MAX8597

PRODUCTION

Low-Dropout, Wide-Input-Voltage, Step-Down Controllers

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.03

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Overview

Low Dropout with > 99.5% Duty Cycle
Lossless High-Side Current Limit
Wide 4.5V to 28V Input Range
Dynamic Output Voltage Adjustment with Adjustable Offset (MAX8597)
Remote Voltage Sensing for Both Positive and Negative Rails (MAX8597)
Tracking Output Through REFIN (MAX8597)
Adjustable Switching Frequency from 200kHz to 1.4MHz
Adjustable Soft-Start
Prebias Startup
Enable and Power-OK (MAX8598/MAX8599) for Flexible Sequencing
25MHz Error Amplifier
Adjustable Hiccup Current Limit for Output Short-Circuit Protection
Output Overvoltage Protection (MAX8599)
Small, Low-Profile Thin QFN Package

The MAX8597/MAX8598/MAX8599 voltage-mode PWM step-down controllers are designed to operate from a 4.5V to 28V input supply and generate output voltages down to 0.6V. A proprietary switching algorithm stretches the duty cycle to > 99.5% for low-dropout design. Unlike conventional step-down regulators using a p-channel high-side MOSFET to achieve high duty cycle, the MAX8597/MAX8598/MAX8599 drive n-channel MOSFETs resulting in high efficiency and high-current-capability designs.

The MAX8597 is available in a 20-pin thin QFN package and is designed for applications that use an analog signal to control the output voltage with an adjustable offset, such as DC fan-speed control. This is achieved with an internal uncommitted operational amplifier. The MAX8597 is also targeted for tracking output-voltage applications for chipsets, ASIC and DSP cores, and I/O supplies. The MAX8598/MAX8599 are available in a 16-pin thin QFN package and do not have the uncommitted operational amplifier, reference input, and reference output, but offer an open-drain, power-OK output.

The MAX8597/MAX8598/MAX8599 allow startup with prebias voltage on the output for applications where a backup supply or a tracking device may charge the output capacitor before the MAX8597/MAX8598/MAX8599 are enabled. In addition, the MAX8599 features output overvoltage protection.

These controllers also feature lossless high-side peak inductor current sensing, adjustable current limit, and hiccup-mode short-circuit protection. Switching frequency is set with an external resistor from 200kHz to 1.4MHz. This wide frequency range combined with a wide-bandwidth error amplifier enables the loop compensation scheme to give the user ample flexibility to optimize for cost, size, and efficiency.

Applications

Chipset Power Supplies
Nonisolated Power Modules
Tracking Power Supplies (MAX8597)
Variable-Speed DC Fan Power Supplies (MAX8597)

Part Models: 2
1ku List Price: Starting From $3.03

Documentation

Data Sheet 1

MAX8597-MAX8599: Low-Dropout, Wide-Input-Voltage, Step-Down Controllers Data Sheet (Rev.1) 06/21/2005

Technical Articles 2

Power-Supply Solutions for Altera FPGAs 04/24/2012

Power-Supply Solutions for Xilinx FPGAs 04/24/2012

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX8597ETP+	20-LFCSP-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX8597ETP+T	20-LFCSP-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX8597ETP+	PRODUCTION
MAX8597ETP+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
MOSFET & Gate Drivers 3
MAX8535	PRODUCTION	ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies
MAX8536	PRODUCTION	ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies
MAX8585	PRODUCTION	ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies
Switching Regulators & Controllers 4
MAX1917	PRODUCTION	Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies

MAX8554	PRODUCTION	4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications
MAX1954A	PRODUCTION	Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit
MAX8538	PRODUCTION	Dual-Synchronous Buck Controllers for Point-of-Load, Tracking, and DDR Memory Power Supplies

Evaluation Kits

Evaluation Kit for the MAX8597/MAX8598/MAX8599

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Features and Benefits

Low Dropout with > 99.5% Duty Cycle

Lossless High-Side Current Limit

Dynamic Output Adjustment

Output Short-Circuit Protection with Adjustable Hiccup Current Limit

Prebias Soft-Start

Adjustable Soft-Start

Power-OK Output

Small, Low-Profile Thin QFN Package

Fully Assembled and Tested

Product Details

The MAX8597 evaluation kit (EV kit) demonstrates the MAX8597/MAX8598/MAX8599 step-down DC-DC controller application circuits. The EV kit contains two circuits. The MAX8597 circuit demonstrates a voltage-controlled power supply used for DC fan control capable of up to 10A of current. This circuit accepts inputs from 10.8V to 13.2V and generates an output of 6V to 12V depending on the VADJ input. The MAX8598/MAX8599 circuit demonstrates a point-of-load power supply. The circuit accepts inputs from 10.8V to 13.2V and delivers 20A of current at a 1.2V output.

The MAX8597 circuit switches at 600kHz and has up to 97% efficiency with the supplied components. The MAX8598/MAX8599 circuit comes with the MAX8599 installed. It switches at 500kHz and has up to 87% efficiency with the supplied components. This circuit can be used to evaluate the MAX8598 with no external component changes. This EV kit comes fully assembled and tested.