Features: ` Preset +3.3V/+2.5V/+1.8V or Adjustable Regulator utput
` ±3.0% Regulator Accuracy Over the Specifed perating Range
` 25A Supply Current
` Low 180mV Dropout at 100mA Load
` Small Output Capacitor (1F min ceramic or antalum)
` Zero Reverse Leakage Current
` Thermal and Short-Circuit Protection
` Integrated Microprocessor Reset Circuit with 00ms (min) Timeout
` Open-Drain and Push-Pull Reset Outputs
` Regulator Shutdown Input (MAX6329) or Manual eset Input (MAX6349)
` 6-Pin SOT23 PackageApplication·Hand-Held Instruments
·Electronic Planners
·Palm Top Computers
·PCMCIA Cards
·USB Devices
·Cellular Telephones
·Cordless Telephones
·ModemsPinout
SpecificationsIN to GND ...............................................................-0.3V to +7V
SHDN to GND..........................................................-0.3V to +7V
SET to GND ..............................................-0.3V to (VOUT + 0.3V)
MR to GND .............................................................-0.3V to +7V
RESET, RESET to GND, (Push-Pull) ............0.3V to (VOUT + 0.3V)
RESET to GNd,(Open-Drain).......................-0.3V to (VOUT +0.3V)
OUT to GND ............................................................-0.3V to +7V
Short-Circuit Duration...............................................Continuous
Maximum Current into Any Pin (except IN, OUT) ............±20mA
Continuous Power Dissipation (TA = +70)
6-Pin SOT23 (derate 7.1mW/ above +70)................571mW
Thermal Resistance (JA) ...........................................+140/W
Operating Temperature Range................................0 to +85
Junction Temperature......................................................+150
Storage Temperature Range .............................-65 to +150
Lead Temperature (soldering, 10s) .................................+300
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional peration of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to bsolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX6329/MAX6349 are low-dropout, micropower inear voltage regulators with integrated microprocessor eset circuits. Each is available with preset +3.3V, 2.5V, +1.8V, or adjustable output voltages and can eliver up to 150mA load current. Employing internal Pchannel OSFET pass transistors, the devices consume nly 25A supply current, independent of the evice load. The low supply current, low dropout voltage, nd integrated reset functionality make these evices ideal for battery powered portable equipment.
The MAX6329/MAX6349 include an internal reset circuit hat indicates when the regulator output drops below tandard microprocessor supply tolerances (-5% or 10%). The reset output remains asserted for 100ms min) after the regulator output exceeds the selected eset threshold, ensuring that supply voltages and clock scillators have stabilized before processor activity is nabled. Reset outputs are available in push-pull (activelow r -high) and open-drain (active-low) options. The nternal reset circuit replaces external microprocessor upervisors or RC-based reset time delays.
The MAX6329/MAX6349 are optimized for use with a F (min) output capacitor. The regulator output voltage s adjustable with an external resistor-divider network t SET (reset threshold voltages track the desired utput voltage). Each device includes thermal shutdown rotection, output short-circuit protection, and everse leakage protection. The MAX6329 includes a hutdown feature to reduce regulator current below A (max) and the MAX6349 offers a manual reset nput to assert a microprocessor reset while the regulator utput is within specification.
MAX6329 Data Sheet
