MAX1658 Datasheet, PDF (9/12 Pages) Maxim Integrated Products – 350mA, 16.5V Input, Low-Dropout Linear Regulators

350mA, 16.5V Input,
Low-Dropout Linear Regulators
__________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 volt-
ages higher than 3.3V require less output capacitance
to remain stable.
Table 1. Typical Load Current Capabilities
OUTPUT CAPACITOR
2.2µF tantalum
4.7µF tantalum
10µF tantalum
LOAD CURRENT RANGE
0mA to 120mA
0mA to 250mA
0mA to 350mA
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.
___________________Chip Information
TRANSISTOR COUNT: 207
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