MAX1993

PRODUCTION

Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.94

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Overview

Inductor Saturation Protection
Accurate Current Limit
Ultra-High Efficiency
Quick-PWM with 100ns Load-Step Response
MAX1992
- 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output Range
MAX1993
- External Reference Input
- Dynamically Selectable Output Voltage (0.7V to 5.5V)
- Optional Power-Good and Fault Blanking During Transitions
±1% V_OUT Accuracy Over Line and Load
2V to 28V Battery Input Range (V_IN)
200/300/450/600kHz Switching Frequency
Overvoltage/Undervoltage Protection Option
1.7ms Digital Soft-Start
Drives Large Synchronous Rectifier FETs
2V ±0.7% Reference Output
Power-Good Window Comparator

The MAX1992/MAX1993 pulse-width modulation (PWM) controllers provide high-efficiency, excellent transient response, and high DC output accuracy. The devices step down high-voltage batteries to generate low-voltage CPU core or chipset/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. Efficiency is enhanced by the ability to drive very large synchronous-rectifier MOSFETs. Current sensing to ensure reliable overload and inductor saturation protection is available using an external current-sense resistor in series with the output. Alternatively, the controller can sense the current across the synchronous rectifier alone or use lossless inductor sensing for lowest power dissipation.

Single-stage buck conversion allows the MAX1992/MAX1993 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down from another system supply rail instead of the battery) at the maximum switching frequency allows the minimum possible physical size.

The MAX1992 powers the CPU core, chipset, DRAM, or other supply rails as low as 0.7V. The MAX1993 powers chipsets and graphics processor cores, which require dynamically adjustable output voltages. The MAX1993 provides a tracking input that can be used for active termination buses. The MAX1992/MAX1993 are available in a 24-pin thin QFN package with optional overvoltage and undervoltage protection.

For dual step-down PWM controllers with inductor saturation protection, external reference input voltage, and dynamically selectable output voltages, refer to the MAX1540/MAX1541 data sheet.

Applications

1.8V and 2.5V Supplies
Active Termination Buses (MAX1993)
Core/IO Supplies as Low as 0.7V
CPU/Chipset/GPU with Dynamic Voltage Cores
DDR Memory Termination (MAX1993)
Notebook Computers

Part Models: 2
1ku List Price: Starting From $4.94

Documentation

Data Sheet 1

MAX1992-MAX1993: Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages Data Sheet (Rev.1) 10/10/2005

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
MAX1993ETG+	24-TQFN-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1993ETG+T	24-TQFN-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1993ETG+	PRODUCTION
MAX1993ETG+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
Switching Regulators & Controllers 6
MAX1714	PRODUCTION	High-Speed Step-Down Controller for Notebook Computers
MAX1844	Obsolete	High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers
MAX1791	PRODUCTION	High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks
MAX1762		High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks

MAX1809	PRODUCTION	3A, 1MHz, DDR Memory Termination Supply
MAX1644	PRODUCTION	2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Evaluation Kits

Evaluation Kit for the MAX1992, MAX1993

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Features and Benefits

7V to 24V Input Voltage Range
Preset 1.8V/2.5V Output Voltages (Adjustable from 0.7V to 5.5V, MAX1992)
Dynamically Selectable Output Voltages 1.0V/1.5V (Adjustable from 0.7V to 5.5V, MAX1993)
4A Output Current
300kHz Switching Frequency
Selectable Inductor Saturation Protection
Power-Good Output
Selectable Overvoltage/Undervoltage Protection
Low-Profile Components
Fully Assembled and Tested

Product Details

The MAX1993 evaluation kit (EV kit) demonstrates the MAX1993's standard 4A application circuit. This DC-to-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.

The MAX1993 EV kit provides a dynamically adjustable 1.0V/1.5V output voltage from 7V to 24V battery input range. It delivers up to 4A output current with greater than 90% efficiency. The EV kit operates at 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 the evaluation of other dynamically adjustable output voltages in the 0.7V to 5.5V range by changing R6, R7, and R8 resistors.

This EV kit can also be used to evaluate the MAX1992, which has preset 1.8V/2.5V output voltages.