Low-Dropout, Low-I_Q, 1A Linear Regulator

 

Part Number	Replacement	Explanation

Description

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The MAX1793 low-dropout linear regulator (LDO) operates from +2.5V to +5.5V and delivers a guaranteed 1A load current with a low 210mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see the Ordering Information in the full data sheet) or can be adjusted from 1.25V to 5.0V with an external resistor-divider.

An internal pMOS pass transistor allows a low 125µA supply current, making the MAX1793 ideal for battery-operated portable equipment. Other features include a built-in reset output, low-power shutdown, and short-circuit and thermal-overload protection. The MAX1793 is available in a 1.5W, 16-pin power TSSOP package, which is 30% smaller than a SOT223 package and only 1.1mm high.

MAX1793: Typical Operating Circuit Enlarge+

Key Features

• Guaranteed 1A Output Current
• Low 210mV Dropout at 1A
• Up to ±1% Output Voltage Accuracy
  • Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V
  • Adjustable from 1.25V to 5.0V
• Reset Output (4ms Delay)
• Low 125µA Ground Current
• 0.1µA Shutdown
• Low 115µV_RMS Output Noise
• Thermal-Overload Protection
• Output Current Limit
• Tiny TSSOP Power Package (1.5W) 30% Smaller than SOT223 (only 1.1mm high)

Applications/Uses

• Docking Stations
• Notebook Computers
• PDAs
• USB Hubs
• Wireless Base Stations