Datasheet Analog Devices LT8609AHMSE#WTRPBF — Datenblatt

LT8609/LT8609A/LT8609B
42V, 3A Synchronous Step-Down
Regulator with 2.5µA Quiescent Current
DESCRIPTION FEATURES Wide Input Voltage Range: 3.0V to 42V
n Ultralow Quiescent Current Burst Mode® Operation:
n 0.5),
a minimum inductance is required to avoid sub-harmonic
oscillation. See Application Note 19. twice its nominal value, possibly exceeding the LT8609/
LT8609A/LT8609B's voltage rating. This situation is easily avoided (see Linear Technology Application Note 88).
Output Capacitor and Output Ripple
The output capacitor has two essential functions. Along
with the inductor, it filters the square wave generated by the
LT8609/LT8609A/LT8609B to produce the DC output. In this
role it determines the output ripple, thus low impedance at
the switching frequency is important. The second function is
to store energy in order to satisfy transient loads and stabilize the LT8609/LT8609A/LT8609B's control loop. Ceramic
capacitors have very low equivalent series resistance (ESR)
and provide the best ripple performance. A good starting
value is: Input Capacitor
Bypass the input of the LT8609/LT8609A/LT8609B circuit
with a ceramic capacitor of X7R or X5R type. Y5V types have
poor performance over temperature and applied voltage,
and should not be used. A 4.7μF to 10μF ceramic capacitor …