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MP2002DD Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP2002DD Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 11 page MP2002 – LOW INPUT VOLTAGE, 500mA LINEAR REGULATOR MP2002 Rev. 1.11 www.MonolithicPower.com 8 10/10/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. APPLICATION INFORMATION Setting the Output Voltage The MP2002 has an adjustable output voltage, set via an external resistor divider (R1 and R2 in Figure 2). ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = FB FB OUT V V V 2 R 1 R where VFB = 0.5V (The OUT feedback threshold voltage.) Example: For 2.5V Output and R2=10kΩ 2.5 0.5 R1 10k 40k 0.5 − ⎛⎞ =× = Ω ⎜⎟ ⎝⎠ A standard 40kΩ ( ±1%) resistor can be selected for R1. Table 1 lists the selected R1 values for some typical output voltages (assuming R2 = 10kΩ). Power Good The power good pin is an open collector output completed with a pull up resistor (10kΩ recommended). The pull up resistor can be tied to a supply within the voltage range of the pin (0V to 5.5V). For example, the pull up resistor can be tied to the input voltage when it is being monitored by an IC powered from this input voltage. It monitors the output voltage, and if the output voltage is 10% below its regulation point, the PG pin becomes low. Table 1—Adjustable Output Voltage R1 Values (R2=10kΩ) VOUT (V) R1 (Ω) 1.25 15k 1.5 20k 1.8 26k 2 30k 2.5 40k 2.8 46k 3 50k 3.3 56k 4 70k 5 90k Bypass Capacitors For lower noise, the reference voltage can be bypassed by an external capacitor. A low ESR capacitor, such as the ceramic type, will provide the best performance. |
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