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

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.6
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 6
Switch Type Internal
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins TSSOP/28
Budgetary
Price (See Notes)
4.96
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.6
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 6
Switch Type Internal
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins TSSOP/28
Budgetary
Price (See Notes)
4.96

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

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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Simplified Block Diagram

MAX1945R, MAX1945S: Typical Operating Circuit MAX1945R, MAX1945S: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .