LT1777 Linear Technology, LT1777 Datasheet - Page 16

• Manufacturer Part Number: LT1777
• Description: Low Noise Step-Down Switching Regulator
• Manufacturer: Linear Technology

APPLICATIONS
LT1777
As an example, assume that the capacitance between the
V
the high impedance node in question exhibits a capaci-
tance of 1pF to ground. Also assume a “typical” 36V
5V
the V
high impedance pin, causing abnormal operation. An
explicit 100pF capacitor added to the node will reduce the
amplitude of the disturbance to more like 35mV (although
settling time will increase).
16
SW
OUT
node and a high impedance pin node is 0.1pF, and that
SW
application. Due to the large voltage excursion at
node, this will couple a 3.5V(!) transient to the
U
INFORMATION
U
W
U
IN
to
Specific pin recommendations are as follows:
explicit compensation network. A value of one-tenth of
the main compensation capacitor is recommended, up
to a maximum of 100pF.
FB: Assuming the V
usually requires no explicit capacitor of its own, but
keep this node physically small to minimize stray
capacitance.
SHDN: If unused, add a 100pF capacitor to ground.
SYNC: Ground if unused.
V
C
: Add a capacitor directly to ground in addition to the
C
pin is handled properly, this pin