参数资料
型号: LTC1475CMS8#TR
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: 0.75 A SWITCHING REGULATOR, PDSO8
封装: PLASTIC, MSOP-8
文件页数: 16/20页
文件大小: 237K
代理商: LTC1475CMS8#TR
5
LTC1474/LTC1475
FUNCTIONAL DIAGRA
UU
W
LTC1474: LBI
LTC1475: LBI/OFF
+
+
+
×
1
A
LBI/OFF
LBO
4.75
s
1-SHOT
1.23V
REFERENCE
GND
1474/75 FD
4
2
8
1.23V
1M
3M
(5V VERSION)
1.68M
(3.3V VERSION)
READY
STRETCH
VCC
VIN
VOUT
VOUT/VFB
1
×
C
ON
V
LB
ON
5
SW
SENSE
RSENSE
(OPTIONAL)
20
×
100mV
WAKEUP
TRIGGER
OUT
LTC1474: RUN
LTC1475: ON
1
5
6
7
+
× CONNECTIONNOTPRESENTINLTC1474SERIES
CONNECTION PRESENT IN LTC1474 SERIES ONLY
3
OUTPUT DIVIDER IS
IMPLEMENTED EXTERNALLY IN
ADJUSTABLE VERSIONS
PIN FUNCTIONS
UU
U
VOUT/VFB (Pin 1): Feedback of Output Voltage. In the fixed
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.
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 VIN pins.
VIN (Pin 7): Main Supply Pin.
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.
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