MAX1904
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MAX1904

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

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 4
1ku List Price Starting From $7.48
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
  • Additional Details
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    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.

    Applications

    • Desktop CPU Local DC-DC Converters
    • Notebook and Subnotebook Computers
    • PDAs and Mobile Communicators
    Part Models 4
    1ku List Price Starting From $7.48

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