MIC5207 datasheet(13/24 Pages) MICROCHIP

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

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DS20005719C-page 13

MIC5207

Figure 4-1

includes

470 pF

capacitor

for

ultra-low-noise operation and shows EN (pin 3)

connected to IN (pin 1) for an application where

enable/shutdown is not required. COUT = 2.2 µF

minimum.

FIGURE 4-2:

Low-Noise Fixed-Voltage

Application.

Figure 4-2 is an example of a basic low-noise

configuration. COUT = 1 µF minimum.

4.9

Adjustable Regulator Applications

The MIC5207YM5 can be adjusted to a specific output

voltage by using two external resistors (Figure 4-3).

The resistors set the output voltage based on

Equation 4-8:

EQUATION 4-8:

This equation is correct due to the configuration of the

bandgap reference. The bandgap voltage is relative to

the output, as seen in the Functional Diagrams.

Traditional regulators normally have the reference

voltage relative to ground; therefore, their equations

are different from the equation for the MIC5207YM5.

Resistor values are not critical because ADJ (adjust)

has a high input impedance, but for best results use

resistors of 470 kΩ or less. A capacitor from ADJ to

ground provides greatly improved noise performance.

FIGURE 4-3:

Ultra-Low-Noise

Adjustable-Voltage Application.

Figure 4-3 includes the optional 470 pF noise bypass

capacitor from ADJ to GND to reduce output noise.

4.10 Dual-Supply Operation

When used in dual-supply systems where the regulator

load is returned to a negative supply, the output voltage

must be diode clamped to ground.

4.11 USB Application

Figure 4-4 shows the MIC5207-3.3YM5 in a USB

application. Because the VBUS supply may be greater

than 10 inches from the regulator, a 1 µF input

capacitor is included.

FIGURE 4-4:

Single-Port Self-Powered

Hub.

1.0μF

VOUT

MIC5207-x.xYM5

VIN

ENABLE

SHUTDOWN

VOUT VREF 1 R2

-------









1.242V

1 R2

-------











2.2μF

VOUT

MIC5207YM5

VIN

470pF

D+

D–

GND

USB

PORT

DATA

OUT

FLG

ON/OFF

OVERCURRENT

MIC2525

USB CONTROLLER

GND

OUT

5.0V

0.1μF

10K

UPSTREAM

BUS

100mA MAX.

FERRITE

BEADS

150μF

D+

D–

GND

DATA

1μF

BUS

OUT

MIC5207-3.3YM5

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