MAX6349

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

Fully-Integrated LDO and µP Supervisory Reset in a SOT23 Package


Please check latest availability status for a specific part variant.

Description

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.
MAX6329, MAX6349: Typical Operating Circuit MAX6329, MAX6349: Typical Operating Circuit Enlarge+

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

Applications/Uses

  • Audio Systems
  • Cordless Phones
  • Electronic Planners
  • Global Positioning Systems (GPS)
  • Handheld Instruments (PDAs, Palmtops)
  • Modems
  • Palmtop Computers
  • PCMCIA Cards
  • USB Devices
Part NumberRegulatorsVIN
(V)
VIN
(V)
Preset VOUT
(V)
Adj. VOUT
(V)
Adj. VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(µA)
Low Batt./ Pwr. Fail OutPOK/Reset Thresh.
(V)
WatchdogReverse Batt. Protect.Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtypmaxnomSee Notes
MAX6329 12.55.5
1.8
2.5
3.3
1.2350.315015050No
Vout-10%
Vout-5%
NoNo0 to +85
SOT23/6
$1.77 @1k
MAX6349 -40 to +85
SOT23/6
$1.99 @1k
See All Linear Regulators (144)
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.

Quality and Environmental Data

Request Reliability Report for: MAX6349 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX6349

CAD Symbols and Footprints

  • MAX6349SPUT+
  • MAX6349THUT+T
  • MAX6349TLUT+
  • MAX6349TLUT+T
  • MAX6349VPUT+
  • MAX6349VPUT+T
  • MAX6349WHUT+
  • MAX6349WHUT+T
  • MAX6349WLUT+
  • MAX6349WLUT+T
  • MAX6349YHUT+
  • MAX6349YLUT+
  • MAX6349YLUT+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.

    Quality Management System >
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