LTC3714 Linear, LTC3714 Datasheet - Page 17

• Manufacturer Part Number: LTC3714
• Description: Wide Operating Range / Step-Down Controller with Internal Op Amp
• Manufacturer: Linear

APPLICATIO S I FOR ATIO
INTV
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
within the LTC3714. The INTV
50mA RMS and must be bypassed to ground with a
minimum of 4.7 F tantalum or other low ESR capacitor.
Good bypassing is necessary to supply the high transient
currents required by the MOSFET gate drivers. Applica-
tions using large MOSFETs with a high input voltage and
high frequency of operation may cause the LTC3714 to
exceed its maximum junction temperature rating or RMS
current rating. Most of the supply current drives the
MOSFET gates unless an external EXTV
In continuous mode operation, this current is I
f(Q
estimated from the equations given in Note 2 of the
Electrical Characteristics. For example, the LTC3714EG is
limited to less than 14mA from a 30V supply:
For larger currents, consider using an external supply with
the EXTV
T
g(TOP)
J
CC
= 70 C + (14mA)(30V)(130 C/W) = 125 C
Regulator
CC
+ Q
pin.
g(BOT)
U
). The junction temperature can be
U
CC
W
pin can supply up to
CC
source is used.
U
GATECHG
=
Table 1. VID Output Voltage Programming
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
LTC3714
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
V
0.975V
0.950V
0.925V
0.900V
0.875V
0.850V
0.825V
0.800V
0.775V
0.750V
0.725V
0.700V
0.675V
0.650V
0.625V
0.600V
17
OUT
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
1.25V
1.20V
1.15V
1.10V
1.05V
1.00V
(V)
3714f