MAX1945

PRODUCTION

1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators

Smallest 6A, 1MHz, 1%-Accurate Internal Switch Step-Down DC-DC

Data Sheet (Rev. 1) Product Selection Table

Part Models: 3
1ku List Price: Starting From $5.84

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Part Details

6A PWM Step-Down Regulator with 95% Efficiency
1MHz/500kHz Switching for Small External Components
0.76in² Complete 6A Regulator Footprint
External Components' Height <3mm
±1% Output Accuracy over Load and Line
Operate from 2.6V to 5.5V Supply
Operate from 2.5V Input with V_CC at 3.3V/5V
Preset Output Voltage of 1.8V or 2.5V
Adjustable Output from 0.8V to 85% of Input
Voltage Margining: ±4% (MAX1945R) or ±9% (MAX1945S)
Synchronize to External Clock
SYNCOUT Provides 180-Degree Out-of-Phase Clock Output
All-Ceramic or Electrolytic Capacitor Designs

Part Models: 3
1ku List Price: Starting From $5.84

Documentation

Data Sheet 1

MAX1945R-MAX1945S: 1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators Data Sheet (Rev.1) 08/24/2004

Technical Articles 2

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

DC to DC Buck Converter Tutorial & Diagram 11/29/2001

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
MAX1945REUI+	28-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1945REUI+T	28-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1945REUI/GG8	Thin Shrink Small-Outline Package, Exposed Pad	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Internal Power Switch Buck Regulators 2
MAX1951	PRODUCTION	1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators
MAX1973	PRODUCTION	Smallest 1A, 1.4MHz Step-Down Regulators

Evaluation Kits

Evaluation Kit for the MAX1945

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Features and Benefits

0.970in x 0.840in Circuit Footprint
2.6V to 5.5V Input Range
Output Voltage
- 1.8V/2.5V Preset
- 0.8V to 0.85 x V_IN Adjustable
Provides Up to 6A Output Current
±4% Voltage Margining
Internal Power Switch and Synchronous Rectifier
500kHz/1MHz PWM Selectable Switching Frequency
SYNC Input: Synchronizes from 400kHz to 1.2MHz TTL/CMOS Clock
SYNC Output: Drives 2nd MAX1945 Switching 180 Degrees Out-of-Phase
All Surface-Mount Components
Fully Assembled and Tested

Product Details

The MAX1945 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a high-efficiency step-down switching-regulator circuit for applications requiring on-board postregulation. The circuit utilizes a MAX1945R regulator featuring ±4% voltage margining and is configured for a 1.8V output voltage. The circuit provides up to 6A of current. A 2.6V to 5.5V DC source can be utilized to power the circuit's input.

The MAX1945R IC features an internal power MOSFET switch and an internal synchronous rectifier. The MAX1945 EV kit provides connections for the SYNC input. It also provides an output to synchronize another MAX1945 EV kit clock 180 degrees out-of-phase. Pulse-width modulated (PWM) operation at 500kHz allows the use of tiny surface-mount components.

Applications

ASIC/CPU/DSP Core Voltages
Base Station, Telecom, and Networking
Equipment Power Supplies
Low-Voltage, High-Density Distributed Power
RAM Power Supply
Server and Notebook Power Supplies
Supplies

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