MP8801

– 150MA, LOW-NOISE, LOW-DROPOUT LINEAR REGULATOR

MP8801 Rev. 2.0

MonolithicPower.com

7

7/19/2021

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OPERATION

The

MP8801

is

a

low-current,

low-noise,

high-PSRR, low-dropout linear regulator. It is

designed for use in devices that require low-

noise

power

supplies

and

high-PSRR

applications, such as PLL VCO supplies for

mobile handsets, 802.11 PC Cards, as well as

audio codecs and microphones. It also uses a

PMOS pass element and features internal

thermal shutdown. The

MP8801’s typically fixed

output can be set to 2.5V, 2.85V, or 3.3V,

depending on the internal resistor divider (see

Figure 1). The fixed output can be converted to

an adjustable output via a resistor divider (R1 +

R2) (see Figure 2). For improved transient

response, add a feed-forward capacitor (CBYP)

to the resistor divider.

Figure 1: Low-Noise, Fixed Output, Linear Regulator

Figure 2: Low-Noise, Adjustable Output, Linear Regulator (VOUT = VFB x 1 + [R1 / R2])