MAX1842

1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches


Please check latest availability status for a specific part variant.

Description

The MAX1742/MAX1842 constant-off-time, pulse-width- modulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode. The internal 90mΩ PMOS power switch and 70mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 1A. The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or 1.5V output voltage or an adjustable output from 1.1V to VIN. They achieve efficiencies as high as 95%.

The MAX1742/MAX1842 use a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. Both devices are designed for continuous output currents up to 1A. The MAX1742 uses a peak current limit of 1.3A (min) and is suitable for applications requiring small external component size and high efficiency. The MAX1842 has a higher current limit of 3.1A (min) and is intended for applications requiring an occasional burst of output current up to 2.7A. Both devices also feature an adjustable soft-start to limit surge currents during startup, a 100% duty cycle mode for low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1742/MAX1842 are available in 16-pin QSOP packages.

For similar devices that provide continuous output currents up to 2A and 3A, refer to the MAX1644 and MAX1623 data sheets.
MAX1742, MAX1842: Typical Configuration MAX1742, MAX1842: Typical Configuration Enlarge+

Key Features

  • ±1% Output Accuracy
  • 95% Efficiency
  • Internal PMOS and NMOS Switches
    • 90mΩ On-Resistance at VIN = 4.5V
    • 110mΩ On-Resistance at VIN = 3V
  • Output Voltage
    • 2.5V, 1.8V, or 1.5V Pin Selectable
    • 1.1V to VIN Adjustable
  • 3V to 5.5V Input Voltage Range
  • 600µA (max) Operating Supply Current
  • <1µA Shutdown Supply Current
  • Programmable Constant-Off-Time Operation
  • 1MHz (max) Switching Frequency
  • Idle-Mode Operation at Light Loads
  • Thermal Shutdown
  • Adjustable Soft-Start Inrush Current Limiting
  • 100% Duty Cycle During Low-Dropout Operation
  • Output Short-Circuit Protection
  • 16-Pin QSOP Package

Applications/Uses

  • 5V or 3.3V to Low-Voltage Conversion
  • Chipset Supplies
  • CPU I/O Ring
  • Notebook and Subnotebook Computers
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
MAX1742 35.51.15.5
1.5
1.8
2.5
Preset
Resistor
1InternalYes11000
QSOP/16
$4.21 @1k
MAX1842 
QSOP/16
See All Step-Down Switching Regulators (380)
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.


MAX1742EVKIT: Evaluation Kit for the MAX1742, MAX1842
MAX1842EVKIT: Evaluation Kit for the MAX1742, MAX1842

CAD Symbols and Footprints

  • MAX1842EEE+
  • MAX1842EEE+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.

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