Datasheet

VOUTVIN
LMZ34002
-V
OUT
V
IN
C
IN
C
OUT
C
IO
LMZ34002
www.ti.com SNVS989A –JULY 2013–REVISED SEPT 2013
Input to Output Coupling Capacitor
Adding an input to output coupling capacitor (C
IO
) across VIN to VOUT as shown in Figure 46 can help reduce
output voltage ripple and improve transient response. A typical value for C
IO
is 2.2 µF ceramic with a voltage
rating greater than the sum of VIN + |VOUT|.
Figure 46. Input to Output Coupling Capacitor
Overcurrent Protection
For protection against load faults, the LMZ34002 incorporates cycle-by-cycle current limiting. During an
overcurrent condition the output current is limited and the output voltage is reduced. If the output voltage drops
more than 25%, the switching frequency is lowered to reduce power dissipation within the device. When the
overcurrent condition is removed, the output voltage returns to the established voltage.
The LMZ34002 is not designed to endure a sustained short circuit condition. The use of an output fuse, voltage
supervisor circuit, or other overcurrent protection circuit is recommended.
Thermal Shutdown
The internal thermal shutdown circuitry forces the device to stop switching if the junction temperature exceeds
180°C typically. The device reinitiates the power up sequence when the junction temperature drops below 165°C
typically.
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