MAX6329, MAX6349

150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Circuit

Fully-Integrated LDO and µP Supervisory Reset in a SOT23 Package
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The MAX6329/MAX6349 are low-dropout, micropower linear voltage regulators with integrated microprocessor reset circuits. Each is available with preset +3.3V, +2.5V, +1.8V, or adjustable output voltages and can deliver up to 150mA load current. Employing internal P-channel MOSFET pass transistors, the devices consume only 25µA supply current, independent of the device load. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery powered portable equipment.

The MAX6329/MAX6349 include an internal reset circuit that indicates when the regulator output drops below standard microprocessor supply tolerances (-5% or -10%). The reset output remains asserted for 100ms (min) after the regulator output exceeds the selected reset threshold, ensuring that supply voltages and clock oscillators have stabilized before processor activity is enabled. Reset outputs are available in push-pull (active-low or -high) and open-drain (active-low) options. The internal reset circuit replaces external microprocessor supervisors or RC-based reset time delays.

The MAX6329/MAX6349 are optimized for use with a 1µF (min) output capacitor. The regulator output voltage is adjustable with an external resistor-divider network at SET (reset threshold voltages track the desired output voltage). Each device includes thermal shutdown protection, output short-circuit protection, and reverse leakage protection. The MAX6329 includes a shutdown feature to reduce regulator current below 1µA (max) and the MAX6349 offers a manual reset input to assert a microprocessor reset while the regulator output is within specification.

Data Sheet

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Key Features

  • Preset +3.3V/+2.5V/+1.8V or Adjustable Regulator Output
  • ±3.0% Regulator Accuracy Over the Specifed Operating Range
  • 25µA Supply Current
  • Low 180mV Dropout at 100mA Load
  • Small Output Capacitor (1µF min ceramic or tantalum)
  • Zero Reverse Leakage Current
  • Thermal and Short-Circuit Protection
  • Integrated Microprocessor Reset Circuit with 100ms (min) Timeout
  • Open-Drain and Push-Pull Reset Outputs
  • Regulator Shutdown Input (MAX6329) or Manual Reset Input (MAX6349)
  • 6-Pin SOT23 Package


  • Audio Systems
  • Cordless Phones
  • Electronic Planners
  • Global Positioning Systems (GPS)
  • Handheld Instruments (PDAs, Palmtops)
  • Modems
  • Palmtop Computers
  • PCMCIA Cards
  • USB Devices

Key Specifications:

Linear Regulators
Part Number Regulators VIN
Preset VOUT
Low Batt./ Pwr. Fail Out POK/Reset Thresh.
Watchdog Reverse Batt. Protect. Oper. Temp.
min max min max typ max nom See Notes
MAX6329  1 2.5 5.5
1.23 5 0.3 150 50 No
No No 0 to +85 $1.77 @1k
MAX6349  -40 to +85 $1.99 @1k
See All Linear Regulators (149)

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.


MAX6329, MAX6349: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX6329
Topmark Coding MAX6349
New Product Press Release   2001-02-26 ]

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Document Ref.: 19-1889 Rev 3; 2004-06-01
This page last modified: 2007-06-14