MAX8505

3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK


Please check latest availability status for a specific part variant.

Description

The MAX8505 step-down regulator operates from a 2.6V to 5.5V input and generates an adjustable output voltage from 0.8V to 0.85 x VIN at up to 3A. With a 2.6V to 5.5V bias supply, the input voltage can be as low as 2.25V.

The MAX8505 integrates power MOSFETs and operates at 1MHz/500kHz switching frequency to provide a compact design. Current-mode pulse-width-modulated (PWM) control simplifies compensation with ceramic or polymer output capacitors and provides excellent transient response.

The MAX8505 features 1% accurate output over load, line, and temperature variations. Adjustable soft-start is achieved with an external capacitor. During the soft-start period, the voltage-regulation loop is active. This limits the voltage dip when the active devices, such as microprocessors or ASICs connected to the MAX8505's output, apply a sudden load current step upon passing their undervoltage thresholds.

The MAX8505 features current-limit, short-circuit, and thermal-overload protection and enables a rugged design. Open-drain power-OK (POK) monitors the output voltage.

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MAX8505: Typical Operating Circuit MAX8505: Typical Operating Circuit Enlarge+

Key Features

  • Saves Space—4.9mm x 6mm Footprint, 1µH Inductor, 47µF Ceramic Output Capacitor
  • Input Voltage Range
    • 2.6V to 5.5V
    • Down to 2.25V with Bias Supply
  • 0.8V to 0.85 x VIN, 3A Output
  • Ceramic or Polymer Capacitors
  • ±1% Output Accuracy over Load, Line, and Temperature
  • Fast Transient Response
  • Adjustable Soft-Start
  • In-Regulation Soft-Start Limits Output-Voltage Dips at Power-On
  • POK Monitors Output Voltage

Applications/Uses

  • µP/ASIC/DSP/FPGA Core and I/O Supplies
  • Chipset Supplies
  • Network and Telecom Equipment
  • Server, RAID, and Storage Systems
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8505 2.65.50.84.5Resistor3InternalYesYes11000
QSOP/16
$3.11 @1k
See All Step-Down Switching Regulators (367)
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.


MAX8505EVKIT: Evaluation Kit for the MAX8505

CAD Symbols and Footprints

  • MAX8505EEE
  • MAX8505EEE+
  • MAX8505EEE+T
  • MAX8505EEE-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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