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MAX6480BL33AD3 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6480BL33AD3 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 24 page 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit _______________________________________________________________________________________ 9 Detailed Description The MAX6469–MAX6484 are ultra-low, quiescent cur- rent, low-dropout linear regulators with an integrated microprocessor reset circuit. These devices guarantee 300mA (min) drive capabilities and are available with preset output voltages in 100mV increments between +1.5V and +3.3V. The internal reset circuit monitors the regulator output voltage and asserts the reset output when the regulator output is below the microprocessor supply tolerance. Regulator The regulator core operates with +2.5V to +5.5V input voltage range. The output voltage is offered in 100mV increments between +1.5V and +3.3V (contact factory for other output voltage options). The MAX6469– MAX6472/MAX6477–MAX6480 offer an adjustable out- put voltage implemented with an external resistor- divider network between OUT, SET, and GND (Figure 1). SET must be connected to either GND for fixed VOUT or to an external divider for adjustable VOUT. The MAX6469–MAX6472/MAX6477–MAX6480 automatically determine the feedback path depending on the con- nection of SET. The Typical Operating Circuit shows a typical connection for the MAX6469. OUT is an internal- ly regulated low-dropout (LDO) linear regulator that powers a microprocessor. Reset Circuit The reset supervisor circuit is fully integrated in the MAX6469–MAX6484 and uses the same reference volt- age as the regulator. Two supply tolerance reset thresholds, -7.5% and -12.5%, are provided for each type of device. -7.5% Reset: Reset does not assert until the regulator output voltage is at least -5% out of tolerance and always asserts before the regulator output voltage is -10% out of tolerance. -12.5% Reset: Reset does not assert until the regulator output voltage is at least -10% out of tolerance and always asserts before the regulator output voltage is -15% out of tolerance. RESET Output A µP’s reset input starts the µP in a known state. The MAX6469–MAX6484 µP supervisory circuits assert RESET during power-up, power-down, and brownout conditions. RESET asserts when the input voltage is below the undervoltage lockout threshold. RESET asserts when VOUT is below the reset threshold and remains asserted for at least the minimum selected reset timeout period (tRP, Table 3) after VIN rises above the undervoltage lockout threshold and VOUT rises above the reset threshold. RESET asserts when MR is pulled low (MAX6471–MAX6474/MAX6479–MAX6482). RESET asserts when SHDN is pulled low (MAX6469/ MAX6470/MAX6473–MAX6478/MAX6481–MAX6484). Shutdown (MAX6469/MAX6470/MAX6473–MAX6478/MAX6481– MAX6484 only) SHDN allows the regulator to shut down, thereby reduc- ing the total IIN consumption of the device. SHDN pro- vides a digitally controlled active-low shutdown. In shutdown mode, the pass transistor, control circuit, and reference turn off to reduce the supply current to below 0.1µA. Connect SHDN to IN for normal operation. Manual Reset Input (MAX6471–MAX6474/MAX6479–MAX6482 only) Many µP-based products require manual reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset while the regulator output voltage is still within tolerance. Reset remains asserted while MR is low and for the reset timeout period (tRP) after MR returns high. The MR input has an internal pullup of 40kΩ (typ) to OUT. MR can be driven with TTL/CMOS logic levels or with open-drain/collector outputs. Connect a normally open switch from MR to GND to create a manual reset func- tion; external debounce circuitry is not required. If MR is driven from long cables or the device is used in a noisy environment, connect a 0.1µF capacitor from MR to GND to provide additional noise immunity. Feedback Input (MAX6475/MAX6476/MAX6483/MAX6484 only) The feedback input (FB) connects to an internal resistor- divider network (Functional Diagram). FB is not internally connected to VOUT, and as a result can be used to MAX6469–MAX6472 MAX6477–MAX6480 R1 R2 COUT MANUAL RESET GND IN OUT SET 2.5V TO 5.5V (MR) ( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY Figure 1. Adjustable Output Voltage Configuration |
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