MAX1945R, MAX1945S

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

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


Please check latest availability status for a specific part variant.

Description

The MAX1945R/MAX1945S high-efficiency pulse-width modulation (PWM) switching regulators deliver up to 6A of output current. The devices operate from an input supply range of 2.6V to 5.5V and provide selectable output voltages of 1.8V, 2.5V, and adjustable output voltages from 0.8V to 85% of the supply voltage. With VCC at 3.3V/5V, the input voltage can be as low as 2.25V. The MAX1945R/MAX1945S are ideal for on-board post-regulation applications. Total output voltage error is less than ±1% over load, line, and temperature.

The MAX1945R/MAX1945S operate at a selectable fixed frequency (500kHz or 1MHz) or can be synchronized to an external clock (400kHz to 1.2MHz). The high operating frequency minimizes the size of external components. The high bandwidth of the internal error amplifier provides excellent transient response. The MAX1945R/MAX1945S have internal dual N-channel MOSFETs to lower heat dissipation at heavy loads. Two MAX1945R/MAX1945Ss can operate 180 degrees out-of-phase of each other to minimize input capacitance. The devices provide output voltage margining for board-level testing. The MAX1945R provides a ±4% voltage margining. The MAX1945S provides a ±9% voltage margining.

The MAX1945R/MAX1945S are available in 28-pin TSSOP-EP packages and are specified over the -40°C to +85°C industrial temperature range. An evaluation kit is available to speed designs.

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MAX1945R, MAX1945S: Typical Operating Circuit MAX1945R, MAX1945S: Typical Operating Circuit Enlarge+

Key Features

  • 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 VCC 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

Applications/Uses

  • ASIC/CPU/DSP Core Voltages
  • Base Station-, Telecom-, and Networking-Equipment Power Supplies
  • Low-Voltage, High-Density Distributed Power Supplies
  • RAM Power Supply
  • Server and Notebook Power Supplies
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1945 2.65.50.84.5
1.8
2.5
Preset
Resistor
6InternalYes1500
TSSOP/28
$4.46 @1k
See All Step-Down Switching Regulators (367)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1945EVKIT: Evaluation Kit for the MAX1945

Quality and Environmental Data

Request Reliability Report for: MAX1945R  MAX1945S 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX1945REUI
  • MAX1945REUI+
  • MAX1945REUI+T
  • MAX1945REUI-T
  • MAX1945REUI/GG8
  • MAX1945REUI/GH9
  • MAX1945REUI/GH9-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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