參數(shù)資料
型號(hào): LTC1626CS#TR
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 1.6 A SWITCHING REGULATOR, PDSO14
封裝: 0.150 INCH, PLASTIC, SO-14
文件頁(yè)數(shù): 7/12頁(yè)
文件大?。?/td> 258K
代理商: LTC1626CS#TR
4
LTC1626
PWR VIN (Pins 1, 13): Supply for the Power MOSFET and
Its Driver. Decouple this pin properly to ground.
VIN (Pin 2): Main Supply for All the Control Circuitry in
the LTC1626.
LBO (Pin 3): Open-Drain Output of the Low-Battery Com-
parator. This pin will sink current when Pin 4 (LBI) goes
below 1.25V. During shutdown, this pin is high imped-
ance.
LBI (Pin 4): The (–) Input of the Low-Battery Comparator.
The (+) input is connected to a reference voltage of 1.25V.
If not used, connect to VIN.
CT (Pin 5): External capacitor CT from Pin 5 to ground sets
the switch off-time. The operating frequency is dependent
on the input voltage and CT.
ITH (Pin 6): Feedback Amplifier Decoupling Point. The
current comparator threshold is proportional to Pin 6
voltage.
PIN FUNCTIONS
UU
U
SENSE (Pin 7): Connects to the (–) Input of the Current
Comparator.
SENSE + (Pin 8): The (+) Input to the Current Comparator.
A built-in offset between Pins 7 and 8 in conjunction with
RSENSE sets the current trip threshold.
VFB (Pin 9): This pin serves as the feedback pin from an
external resistive divider used to set the output voltage.
SHDN (Pin 10): Shutdown Pin. Pulling this pin to VIN
keeps the internal switch off and puts the LTC1626 in
micropower shutdown. If not used, connect to SGND.
SGND (Pin 11): Small-Signal Ground. Must be routed
separately from other grounds to the (–) terminal of COUT.
PWR GND (Pin 12): Switch Driver Ground. Connects to
the (–) terminal of CIN.
SW (Pin 14): Drain of the P-Channel MOSFET Switch.
Cathode of the Schottky diode must be connected closely
to this pin.
BLOCK DIAGRAM
W
+
+
12
14
1
13
SW
PWR GND
C
+
G
S
+
T
+
+
A3
V
Q
SLEEP
VTH2
VFB
VTH1
VIN
SENSE
SENSE+
25mV TO 150mV
OFF-TIME
CONTROL
CT
5
ITH
LBO
LBI
1626 BD
VOS
SHDN
SGND
13k
+
6
3
10
9
7
8
4
11
2
R
S
PWR VIN
REFERENCE
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