19-1889; Rev 3; 3/04
MAX6329/MAX6349
150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Ci...
19-1889; Rev 3; 3/04
MAX6329/MAX6349
150mA, SOT23, Low-Dropout Linear
Regulators with Internal Microprocessor Reset Circuit
General 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 Pchannel 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 (activelow 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 incl...