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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.6
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 3
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.47
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.6
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 4.5
IOUT1 (A) (max) 3
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.47

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

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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Simplified Block Diagram

MAX8505: Typical Operating Circuit MAX8505: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .