LTC1174HVCN8 Linear Technology, LTC1174HVCN8 Datasheet - Page 6

• Manufacturer Part Number: LTC1174HVCN8
• Description: IC DC/DC CONV STP-DWN&INVRT 8DIP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Invertingr

Specifications of LTC1174HVCN8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 18 V
• Current - Output: 1A
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 18.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

FU CTIO AL DIAGRA
PI FU CTIO S
V
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.
LB
pin will sink current when Pin 3 (LB
During shutdown the state of this pin is indeterminate.
LB
Comparator. The “+” input is connected to a reference
voltage of 1.25V.
GND (Pin 4): Ground Pin.
LTC1174
LTC1174-3.3/LTC1174-5
6
OUT
OUT
IN
U
U
g
m
(V
(Pin 3): The “–” Input of the Low-Battery Voltage
LB
V
(Pin 2): Open Drain of an N-Channel Pull-Down. This
FB
GND 4
FB
OUT
) (Pin 1): For the LTC1174, this pin connects to the
U
2
U
C
U
T
V
TH2
A3
+
–
V
TH1
–
+
–
+
W
IN
A4
A5
) goes below 1.25V.
LB
3
IN
(Pin 1 connection shown for LTC1174-3.3 and LTC1174-5, changes create LTC1174)
REFERENCE
* R1 = 51k FOR LTC1174-3.3
R1 = 93.5k FOR LTC1174-5
1.25V
SLEEP
SET
RESET
V
SHUTDOWN
6
IN
SW (Pin 5): Drain of the P-Channel MOSFET Switch. Cathode
of Schottky diode must be closely connected to this pin.
V
close to ground Pin 4.
I
Switch. With I
with I
SHUTDOWN (Pin 8): Pulling this pin to ground keeps the
internal switch off and puts the LTC1174 in micropower
shutdown.
PGM
8
IN
(Pin 6): Input Supply Voltage. It must be decoupled
Q
PGM
(Pin 7): Selects the Current Limit of the P-Channel
= 0V, the current trip value is reduced to 340mA.
A2
PGM
+
–
= V
IN
A1
V
, the current trip point is 600mA and
LIM1
–
+
V
LIM2
V
I
V
PGM
OUT
FB
7
×
1
(V
31.5k
R1*
FB
)
SW
5
R
0.1Ω
SENSE
1174 BD
1174fe