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MAX6329VH Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6329VH Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page Detailed Description The MAX6329/MAX6349 are low-dropout, low-quies- cent current linear regulators with integrated micro- processor reset circuits. The devices drive loads up to 150mA and are available with preset output voltages of +3.3V, +2.5V, or +1.8V. The internal reset circuit moni- tors the regulator output voltage and asserts the reset output when the regulator output is below the micro- processor supply tolerance. Regulator The regulator core operates with an input voltage range of +2.5V to +5.5V. The output voltage is offered with three fixed voltage options (+3.3V, +2.5V, and +1.8V) for the MAX6329 and MAX6349. Enable the fixed voltage output by connecting SET to ground. The MAX6329/MAX6349 offer an adjustable output voltage that is implemented with an external resistor-divider net- work connected to OUT, SET, and GND (Figure 1). SET must be connected to either GND or the external divider. The MAX6329/MAX6349 automatically determine the feedback path depending on the voltage seen at SET. Featured characteristics include ultra-low quiescent cur- rent and low dropout voltage. The Typical Operating Circuit shows a typical connection for the MAX6329. OUT is an internally regulated low dropout (LDO) linear regulator that powers a microprocessor. Reset Circuit The reset supervisor circuit is fully integrated in the MAX6329/MAX6349 and uses the same reference volt- age as the regulator. Two supply tolerance reset thresh- olds, -5% and -10%, are provided for each type of device: 150mA, SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit 6 _______________________________________________________________________________________ Pin Description PIN NAME DESCRIPTION 1 IN Regulator Input. Supply voltage can range from +2.5V to +5.5V. 2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. SHDN (MAX6329 Only) Active-Low Shutdown Input. A logic low reduces the supply current to < 1µA. Connect 3 MR (MAX6349 Only) Active-Low Manual Reset Input. A logic low forces a reset. Reset remains asserted for the duration of the reset timeout period after MR transitions from low to high. Leave unconnected or connect to VOUT if not used. MR has an internal pullup resistor of 20k Ω (typ) to OUT. RESET Active-Low Reset Output. RESET remains low while VOUT is below the reset threshold or while MR is held low. RESET remains low for the duration of the reset timeout period after the reset conditions are terminated. 4 RESET Active-High Reset Output. RESET remains high while VOUT is below the reset threshold or while MR is held low. RESET remains high for the duration of the reset timeout period after the reset conditions are terminated. 5 SET Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset fixed value (+3.3V, +2.5V, or +1.8V). Connect to an external resistor-divider network for adjustable output operation. 6 OUT Regulator Output. Fixed (+3.3V, +2.5V, or +1.8V) or adjustable (+1.23V to +5.0V). Sources up to 150mA. Bypass with a 1µF minimum capacitor for full rated performance. MAX6329 MAX6349 2.5V TO 5.5V IN OUT SET R2 R1 GND Figure 1. Adjustable Output Voltage Configuration |
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