__________Applications Information

Output Capacitor Selection and Stability

To maintain stability, connect a

≥10µF capacitor with

less than 200m

Ω equivalent series resistance (ESR)

from OUT to GND. Larger output capacitors improve

load-transient response. Currents lower than 350mA

make the use of smaller output capacitors possible.

Table 1 shows the maximum output current typically

achieved using various output capacitors. Output volt-

ages higher than 3.3V require less output capacitance

to remain stable.

Table 1. Typical Load Current Capabilities

Input Bypass Capacitor

The use of a 0.1µF to 10µF input bypass capacitor is

recommended. Larger capacitors provide better sup-

ply-noise rejection and line-transient response, as well

as improved performance when the supply has a high

AC impedance. Polarized input bypass capacitors will

be damaged under reverse battery conditions. If

reverse input voltages are expected, use a non-polar-

ized capacitor at the input.

Noise and PSRR

The MAX1658/MAX1659 exhibit 2.5mVp-p of noise dur-

ing normal operation. This noise level is negligible in

most applications.

The MAX1658/MAX1659 are designed to maintain

excellent power-supply rejection (55dB) at 50Hz/60Hz

(or 50dB at 120Hz). These regulators are ideal for wall-

cube applications that may contain significant ripple.

Larger input and output capacitors will further improve

the circuit’s AC response. See the Power-Supply

Rejection Ratio vs. Frequency graphs in the

Typical

Operating Characteristics.

350mA, 16.5V Input,

Low-Dropout Linear Regulators

_______________________________________________________________________________________

9

OUTPUT CAPACITOR

0mA to 120mA

2.2µF tantalum

LOAD CURRENT RANGE

0mA to 250mA

4.7µF tantalum

0mA to 350mA

10µF tantalum

___________________Chip Information

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