MAX1813

PRODUCTION

Dynamically-Adjustable, Synchronous Step-Down Controller with Integrated Voltage Positioning

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: price unavailable

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Overview

High-Efficiency Voltage Positioning
Quick-PWM Architecture
±1% V_OUT Accuracy Over Line
Adjustable Output Slew Rate
0.600V to 2V Adjustable Output Range (5-Bit DAC)
2V to 28V Battery Input Range
200/300/600/1000kHz Switching Frequency
Output Undervoltage and Overvoltage Protection
Drives Large Synchronous-Rectifier MOSFETs
±20% Accurate Current-Limit
10µA Shutdown Supply Current
2V ±1% Reference Output
Power-Good (PGOOD) Indicator
Small 28-Pin QSOP Package

The MAX1813 step-down controller is intended for core CPU DC-DC converters in notebook computers. The controller features a dynamically adjustable output (5-bit DAC), ultra-fast transient response, high DC accuracy, and high efficiency necessary for leading-edge CPU core power supplies. 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 MAX1813 is designed specifically for CPU core applications requiring a voltage-positioned supply. The voltage-positioning input (VPCS), combined with a high-DC-accuracy control loop, is used to implement a power supply that modifies its output set point in response to the load current. This arrangement decreases full-load power dissipation and reduces the required number of output capacitors.

The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.600V to 2V range. The MAX1813 includes an internal multiplexer that selects between three different DAC code settings. The first two inputs are controlled by five digital input pins (D0–D4). The third input is used for the suspend mode and controlled by two 4-level input pins (S0, S1). Output voltage transitions are accomplished with a proprietary precision slew-rate control that minimizes surge currents to and from the battery while guaranteeing “just-in-time” arrival at the new DAC setting.

The MAX1813's 28V input range enables single-stage buck conversion from high-voltage batteries for the maximum possible efficiency. Alternatively, the controller's high-frequency capability combined with two-stage conversion (stepping down the +5V system supply instead of the battery) allows the smallest possible physical size.

The MAX1813 is available in a 28-pin QSOP package.

Applications

CPU Core Supplies
Docking Stations
Notebook Computers (IMVP-II/Coppermine)
Single-Stage (BATT to V_CORE) Converters
Two-Stage (+5V to V_CORE) Converters

Part Models: 2
1ku List Price: price unavailable

Documentation

Data Sheet 1

MAX1813: Dynamically-Adjustable, Synchronous Step-Down Controller with Integrated Voltage Positioning Data Sheet (Rev.0) 04/01/2001

Reliability Data 1

MAX1813 Reliability Data 01/12/2023

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
MAX1813EEI+	QSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1813EEI+T	QSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 13, 2023 - 2361N WAFER FAB
		pcn_2361n
MAX1813EEI+
MAX1813EEI+T	PRODUCTION
Jan 24, 2019 - 1746N ASSEMBLY
		pcn_1746n
MAX1813EEI+
MAX1813EEI+T	PRODUCTION

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

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1813

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Features and Benefits

High Speed, Accuracy, and Efficiency

IMVP-II/Coppermine/AMD Compatible

Voltage-Positioned Output

Low Output-Capacitor Count (6)

Fast-Response Quick-PWM™ Architecture

7V to 24V Input Voltage Range

0.925V to 2.0V Output Voltage Range (Coppermine/AMD, 5-Bit DAC)

0.6V to 1.75V Output Voltage Range (IMVP-II, 5-Bit DAC)

22A Load-Current Capability

300kHz Switching Frequency

Power Good (PGOOD) Indicator

28-Pin QSOP Package

Low-Profile Components

Fully Assembled and Tested

Product Details

The MAX1813 evaluation kit (EV kit) demonstrates the high-power, dynamically adjustable notebook CPU application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating a precision, low-voltage CPU core VCC rail. The MAX1813 EV kit meets the Intel® mobile CPU's transient voltage specification (IMVP-II/Coppermine), using voltage positioning to minimize the output-capacitor requirements. The MAX1813 has an internal multiplexer which accepts three unique 5-bit VID DAC codes corresponding to performance, battery, and suspend modes. Precision slew-rate control provides "just-in-time" arrival at the new DAC setting, minimizing surge currents to and from the battery.

This fully assembled and tested circuit board provides a digitally adjustable 0.6V to 2.0V output from a 7V to 24V battery input range. It delivers up to 22A output current. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response.