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MP8801 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP8801 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 7 page MP8801 – LOW DROPOUT, 150mA LINEAR REGULATOR MP8801 Rev. 1.6 www.MonolithicPower.com 5 3/6/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. APPLICATION INFORMATION SETTING THE OUTPUT VOLTAGE The fixed output voltage of the MP8801DJ is set to 2.5V, 2.85V or 3.3V, depending on the internal resistor divider (Figure 1). You can also adjust the output voltage by using an external resistor divider (R1 and R2 in Figure 2). However, the sum of R1 and R2 should not exceed 100kΩ in order to minimize the impact of the internal resistor divider. For an accurate output-voltage setting, use 10kΩ ( ±1%) for the low-side resistor R2 of the voltage divider, while the high-side resistor R1 can be determined by the equation: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = FB FB OUT V V V 2 R 1 R Where VFB is the OUT feedback threshold voltage equal to 1.222V. Example: For 2.5V Output Ω = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ Ω − = k 41 . 10 k 10 V 222 . 1 V 222 . 1 V 5 . 2 1 R You can select a standard 10.5kΩ ( ±1%) resistor for R1. The following table lists the selected R1 values for some typical output voltages: Table 1—Adjustable Output Voltage R1 Values VOUT (V) R1 (Ω) R2 (Ω) 1.25 232 1.5 2.26k 1.8 4.75k 2 6.34k 2.5 10.5k 2.8 13k 3 14.7k 3.3 16.9k 4 22.6k 5 30.9k 10k In Figures 3 and 4, C2 is added for an improved transient response. INPUT CAPACITOR SELECTION For proper operation, place a ceramic capacitor (C1) between 1µF and 10µF of dielectric type X5R or X7R between the input pin and ground. Larger values in this range will help improve line transient response at the drawback of increased size. OUTPUT CAPACITOR SELECTION For stable operation, use a ceramic capacitor (C3) of type X5R or X7R between 1µF and 10µF. Larger values in this range will help improve load transient response and reduce noise with the drawback of increased size. Output capacitors of other dielectric types may be used, but are not recommended as their capacitance can deviate greatly from their rated value over temperature. To improve load transient response, add a small ceramic (X5R, X7R or Y5V dielectric) 100nF feed forward capacitor in parallel with R1. The feed forward capacitor is not required for stable operation. |
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