LTC3717-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC3717-1
Linear Technology
'LTC3717-1' PDF : 20 Pages View PDF
LTC3717-1
PI FU CTIO S
BOOST (Pin 28): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor CB connects here. This
pin swings from a diode voltage drop below INTVCC up to
VIN + INTVCC.
RUN/SS (Pin 31): Run Control and Soft-Start Input. A
capacitor to ground at this pin sets the ramp time to full
output current (approximately 3s/µF) and the time delay
for overcurrent latchoff (see Applications Information).
Forcing this pin below 0.8V shuts down the device.
W
FU CTIO AL DIAGRA
RON
VON
1
6 ION
0.7V
2.4V
15 EXTVCC
4.7V
+
VIN
16 VIN
CIN
0.8V
REF
5V
REG
tON
=
VVON
IION
(10pF)
20k
ICMP
R
SQ
+
IREV
–
1.4V
VRNG
3
0.7V
×
5.7µA
ON
SWITCH
LOGIC
SHDN
OV
BOOST
28
TG
27
SW
24
SENSE+
23
INTVCC
17
DRVCC
18
BG
19
PGND
20
SENSE–
21
PGOOD
2
CB
CVCC
M1
L1
DB
+
M2
COUT
VOUT
1
240k
Q2
ITHB
Q1
EA
R2
80k
VREF 10
R1
40k
Q5
SS
–+
0.6V
4 ITH RC CC1
RUN
SHDN
3/10VREF
UV
OV
11/30VREF
1.2µA
R3
20k
R4
40k
VFB
7
SGND
5
6V
0.6V
31 RUN/SS CSS
37171 FD01
sn37171 37171fs
7
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