LTC1475IS8#PBF Linear Technology, LTC1475IS8#PBF Datasheet - Page 5
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LTC1475IS8#PBF
Manufacturer Part Number
LTC1475IS8#PBF
Description
IC DC/DC CONV STEP-DOWN 8-SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet
1.LTC1474CS8-5PBF.pdf
(20 pages)
Specifications of LTC1475IS8#PBF
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
Adjustable
Current - Output
750mA
Voltage - Input
3 ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
FUNCTIONAL DIAGRA
PIN
V
versions, an internal resistive divider divides the output
voltage down for comparison to the internal 1.23V refer-
ence. In the adjustable versions, this divider must be
implemented externally.
LBO (Pin 2): Open Drain Output of the Low Battery
Comparator. This pin will sink current when Pin 3 is below
1.23V.
LBI/OFF (Pin 3): Input to Low Battery Comparator. This
input is compared to the internal 1.23V reference. For the
LTC1475, a momentary ground on this pin puts regulator
in shutdown mode.
GND (Pin 4): Ground Pin.
OUT
LTC1474: RUN
LTC1475: ON
U
U
/V
FUNCTIONS
FB
LBO
(Pin 1): Feedback of Output Voltage. In the fixed
U
1 A
8
2
CONNECTION NOT PRESENT IN LTC1474 SERIES
CONNECTION PRESENT IN LTC1474 SERIES ONLY
U
LBI/OFF
STRETCH
TRIGGER
U
1-SHOT
WAKEUP
LB
OUT
+
–
W
3
4.75 s
LTC1474: LBI
LTC1475: LBI/OFF
READY
ON
ON
C
V
REFERENCE
–
+
–
+
1.23V
1.23V
100mV
SW (Pin 5): Drain of Internal PMOS Power Switch. Cath-
ode of Schottky diode must be closely connected to this
pin.
SENSE (Pin 6): Current Sense Input for Monitoring Switch
Current and Source of Internal PMOS Power Switch.
Maximum switch current is programmed with a resistor
between SENSE and V
V
RUN/ON (Pin 8): On LTC1474, voltage level on this pin
controls shutdown/run mode (ground = shutdown, open/
high = run). On LTC1475, a momentary ground on this pin
puts regulator in run mode. A 100k series resistor must be
used between Pin 8 and the switch or control voltage.
IN
(Pin 7): Main Supply Pin.
V
CC
4
GND
1
(3.3V VERSION)
5
(5V VERSION)
1.68M
1M
20
3M
IN
pins.
LTC1474/LTC1475
SENSE
SW
V
7
6
5
IN
(OPTIONAL)
V
OUTPUT DIVIDER IS
IMPLEMENTED EXTERNALLY IN
ADJUSTABLE VERSIONS
OUT
R
SENSE
1
/V
FB
+
+
1474/75 FD
V
V
IN
OUT
5