MAX1540A

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


Please check latest availability status for a specific part variant.

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.
MAX1540A, MAX1541: Functional Diagram MAX1540A, MAX1541: Functional Diagram Enlarge+

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)

See parametric specs for Step-Down Switching Regulators (408)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1540A 2280.75.5
1.2
1.5
1.8
2.5
Resistor5ExternalYesYes2
200
300
400
500
TQFN/32
$4.19 @1k
MAX1541 
1.8
2.5
7
TQFN/40
$4.57 @1k

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.
Request Reliability Report for: MAX1540A 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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