MAX1902

500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers


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Description

The MAX1901/MAX1902/MAX1904 are buck-topology, step-down, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.

Up to 97% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system suspend or standby mode. Excellent dynamic response corrects output load transients within five clock cycles. Strong 1A on-board gate drivers ensure fast external N-channel MOSFET switching.

These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the active-low SKIP pin enables fixed-frequency mode, for lowest noise under all load conditions.

The MAX1901/MAX1902/MAX1904 include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1902 contains a 12V/120mA linear regulator. The MAX1901/MAX1904 include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.

The MAX1901/MAX1902 contain internal output overvoltage and undervoltage protection features.
MAX1901, MAX1902, MAX1904: Functional Diagram MAX1901, MAX1902, MAX1904: Functional Diagram Enlarge+

Key Features

  • 97% Efficiency
  • 4.2V to 30V Input Range
  • 2.5V to 5.5V Dual Adjustable Outputs
  • Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
  • 12V Linear Regulator
  • Adjustable Secondary Feedback (MAX1901/MAX1904)
  • 5V/50mA Linear Regulator Output
  • Precision 2.5V Reference Output
  • Programmable Power-Up Sequencing
  • Power-Good (active-low RESET) Output
  • Output Overvoltage Protection (MAX1901/MAX1902)
  • Output Undervoltage Shutdown (MAX1901/MAX1902)
  • 333kHz/500kHz Low-Noise, Fixed-Frequency Operation
  • Low-Dropout, 98% Duty-Factor Operation
  • 2.5mW Typical Quiescent Power (12V input, both SMPSs on)
  • 4µA Typical Shutdown Current
  • Applications/Uses

    • Desktop CPU Local DC-DC Converters
    • Notebook and Subnotebook Computers
    • PDAs and Mobile Communicators
    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
    MAX1901 4.2302.55.5
    3.3
    5
    Resistor5ExternalYesYes2330
    SSOP/28
    TQFN/32
    $6.51 @1k
    MAX1902 
    SSOP/28
    $6.61 @1k
    MAX1904 
    SSOP/28
    TQFN/32
    $6.59 @1k
    See All Step-Down Switching Regulators (404)
    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.

    Quality and Environmental Data

    Request Reliability Report for: MAX1902 
    Lead-Free Package Tin (Sn) Whisker Reports
    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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