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MP6401DGT-18BD3 Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP6401DGT-18BD3 Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 16 page MP6401 – 300mA LDO LINEAR REGULATOR WITH INTEGRATED RESET IC MP6401 Rev. 1.0 www.MonolithicPower.com 11 9/7/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. OPERATION The MP6401 integrates a low noise, low dropout, low quiescent current linear regulator and a microprocessor reset circuit. It operates from a 2.5V to 5.5V input voltage and regulates the fixed output voltage with 2% accuracy at 1.8V, 2.5V, 3.3V or adjustable value. The MP6401 can supply to 300mA of load current. The internal reset circuit is used to monitor the regulator output voltage. The RESET asserts when the regulator output voltage drops below the standard microprocessor supply threshold. Linear Regulator The MP6401 can output a fixed voltage (1.8V, 2.5V, 3.3V options) or adjustable voltage which ranges from 1.25V to 5V with 2.0% accuracy by operating from a +2.5V to +5.5V input. The MP6401 can supply up to 300mA of load current. When ADJ is connected to GND, a fixed output voltage is selected. Connecting ADJ pin to the tap of external resistor divider from the OUT to GND, adjustable output voltage is selected. The typical ADJ connection is shown in Fig 3. 2.5V to 5.5V IN OUT ADJ EN GND MP6401 R1 R2 Figure 3—Output Voltage Adjusted with Resistor Divider Reset Function The reset circuit monitors the OUT voltage. RESET asserts while OUT voltage falls below its threshold. Two OUT voltage thresholds (-7.5% and -12.5%) are available. The power-up, power-down, and brownout conditions will make RESET asserted. So MP6401 monitor circuit could right control the microprocessor. RESET asserts when the input and output voltage below their thresholds. RESET asserts when EN is a low logic. When the assert trigger condition is removed, RESET will deassert after a fixed delay time. Four options of reset delay-time (see Table 3) can be selected. EN Shutdown The MP6401 can be switched ON or OFF by a logic input at the EN pin. A high voltage at this pin will turn the device on. When the EN pin is low, the regulator output is off and the supply current is reduced. Generally, the EN pin should be tied to IN to keep the regulator output always on. Do not float the EN pin. Reverse Leakage Protection An internal circuit monitors VIN and VOUT to control the reverse leakage current from OUT to IN. While VIN decreases lower than VOUT and EN still hold logic high, the monitor circuit turns off the pass element and its parasitic diode. Typically the reverse leakage current through pass element decreases to 0.1uA. RESET deasserts until VIN returns greater than VOUT and VOUT is higher than its preset threshold. MP6401 also can work with backup battery at OUT after input power supply is removed as shown in Fig 4. When input power supply is removed, RESET asserts. The backup battery will power the device through two external diodes and typically the current from OUT to ground is 40uA. So, the power supply removing does not erase RAM content if the voltage of backup battery is greater than memory’s standby specification. The backup battery can be replaced by a super-cap, while the diode connected with battery is changed to a current-limiting resistor. MP6401 IN OUT EN Removable MEMORY uP 3.3uF Backup Battery Figure 4— Maintain Memory with Backup Battery Current Limit The MP6401 includes a current limit structure which monitors and controls pass element gate voltage limiting the guaranteed maximum output current to 500mA. |
Similar Part No. - MP6401DGT-18BD3 |
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Similar Description - MP6401DGT-18BD3 |
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