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LTC1174HVIS8 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1174HVIS8
Description  High Efficiency Step-Down and Inverting DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1174HVIS8 Datasheet(HTML) 6 Page - Linear Technology

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6
LTC1174
LTC1174-3.3/LTC1174-5
1174fe
(Pin 1 connection shown for LTC1174-3.3 and LTC1174-5, changes create LTC1174)
FU CTIO AL DIAGRA
+
VTH2
+
+
VLIM2
VLIM1
IPGM
RSENSE
0.1
RESET
VTH1
LBOUT 2
1174 BD
gmVFB
1.25V
REFERENCE
Q
GND 4
5
SW
1
VOUT (VFB)
7
+
A1
×
R1*
31.5k
SET
6
VIN
LBIN
3
SHUTDOWN
8
CT
SLEEP
+
A3
A4
A5
VFB
* R1 = 51k FOR LTC1174-3.3
R1 = 93.5k FOR LTC1174-5
A2
SW(Pin5):Drain of the P-Channel MOSFETSwitch. Cathode
of Schottky diode must be closely connected to this pin.
VIN (Pin 6): Input Supply Voltage. It must be decoupled
close to ground Pin 4.
IPGM (Pin 7): Selects the Current Limit of the P-Channel
Switch. With IPGM = VIN, the current trip point is 600mA and
with IPGM = 0V, the current trip value is reduced to 340mA.
SHUTDOWN (Pin 8): Pulling this pin to ground keeps the
internal switch off and puts the LTC1174 in micropower
shutdown.
VOUT (VFB)(Pin1): FortheLTC1174,thispinconnectstothe
main voltage comparator’s input. On the LTC1174-3.3 and
LTC1174-5 this pin goes to an internal resistive divider
which sets the output voltage.
LBOUT (Pin 2): Open Drain of an N-Channel Pull-Down. This
pin will sink current when Pin 3 (LBIN) goes below 1.25V.
During shutdown the state of this pin is indeterminate.
LBIN (Pin 3): The “–” Input of the Low-Battery Voltage
Comparator. The “+” input is connected to a reference
voltage of 1.25V.
GND (Pin 4): Ground Pin.
PI FU CTIO S


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