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Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Dual, Quick-PWM™, Step-Down Controllers have Saturation Protection and Dynamic Output Voltages

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.7
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 1.2
1.5
1.8
2.5
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 200
300
400
500
Package/Pins TQFN/32
Budgetary
Price (See Notes)
5.22
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.7
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 1.2
1.5
1.8
2.5
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 200
300
400
500
Package/Pins TQFN/32
Budgetary
Price (See Notes)
5.22

Key Features

  • Inductor-Saturation Protection
  • Accurate Differential Current-Sense Inputs
  • Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
  • MAX1540A
    • 1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
    • 2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    • Fixed 5V, 100mA Linear Regulator
  • MAX1541
    • External Reference Input (REFIN1)
    • Dynamically Selectable Output Voltage—0.7V to 5.5V (OUT1)
    • 2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    • Optional Power-Good and Fault Blanking During Transitions
    • Fixed 5V or Adjustable 100mA Linear Regulator
  • 1% VOUT Accuracy over Line and Load
  • 2V to 28V Battery Input Range
  • 170kHz to 620kHz Selectable Switching Frequency
  • Overvoltage/Undervoltage-Protection Option
  • 1.7ms Digital Soft-Start
  • Drives Large Synchronous-Rectifier FETs
  • 2V ±0.7% Reference Output
  • Separate Power-Good Window Comparators

Applications/Uses

  • 0.7V to 5.5V Supply Rails
  • Active Termination Buses (MAX1541)
  • Core/IO Supplies as Low as 0.7V
  • CPU/Chipset/GPU with Dynamic Voltage Cores
  • DDR Memory Termination (MAX1541)
  • Notebook Computers
  • Supplies (MAX1541)

Description

The MAX1540A/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excellent transient response, and high DC-output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers.

The Maxim proprietary Quick-PWM™ controllers are free running, constant on-time with input feed forward. This configuration provides ultra-fast transient response, wide input-output (I/O) differential range, low supply current, and tight load-regulation characteristics. The controllers can accurately sense the inductor current across an external current-sense resistor in series with the output to ensure reliable overload and inductor saturation protection. Alternatively, the controllers can use the synchronous rectifier itself or lossless inductor current-sensing methods to provide overload protection with lower power dissipation.

For a single step-down PWM controller with inductor-saturation protection, external-reference input voltage, and dynamically selectable output voltages, refer to the MAX1992/MAX1993 data sheet.

Simplified Block Diagram

MAX1540A, MAX1541: Functional Diagram MAX1540A, MAX1541: Functional Diagram 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.