Applications Information

Output Capacitor Selection and Stability

To maintain stability, connect a ≥10μF capacitor with less

than 200mΩ 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 voltages higher than

3.3V require less output capacitance to remain stable.

Input Bypass Capacitor

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

recommended. Larger capacitors provide better supply

noise rejection and line-transient response, as well as

improved performance when the supply has a high AC

impedance. Polarized input bypass capacitors become

damaged under reverse-battery conditions. If reverse

input voltages are expected, use a nonpolarized capacitor

at the input.

Noise and PSRR

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

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 further improve the

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

Ratio vs. Frequency graphs in the Typical Operating

Characteristics.

Table 1. Typical Load Current Capabilities

OUTPUT CAPACITOR

LOAD CURRENT RANGE

2.2μF tantalum

0mA to 120mA

4.7μF tantalum

0mA to 250mA

10μF tantalum

0mA to 350mA

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

8 SO

S8+10F

21-0041

90-0096

MAX1658/MAX1659

350mA, 16.5V Input,

Low-Dropout Linear Regulators

www.maximintegrated.com

Maxim Integrated │ 9

Package Information

For the latest package outline information and land patterns

(footprints), go to

www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

Chip Information

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