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LTC1872BES6 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC1872BES6
Description  Constant Frequency Current Mode Step-Up DC/DC Controller in ThinSOT
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1872BES6 Datasheet(HTML) 10 Page - Linear Technology

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10
LTC1872B
LTC1872B 3-Cell White LED Driver
ITH/RUN
LTC1872B
10k
R1
0.27
Ω
53.6
Ω
L1
150
µH
220pF
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: AVX TPSD156M035R0300
D0: MOTOROLA MBR0540
D1-D7: CMD333UWC
GND
VFB
5
4
6
1872B TA04
1
2
3
NGATE
VIN
SENSE–
C1
10
µF
10V
VOUT ≈ 28.8V
(WITH 8 LEDs)
C2
15
µF
35V
+
C3
0.1
µF
CERAMIC
M1
D0
1 TO 8
WHITE
LEDs
15mA
D1
D2
•
•
•
D8
AA
AA
AA
VIN = 3 AA CELLS ≈ 2.7V TO 4.8V
L1: COILCRAFT DO1608C-154
M1: Si9804
R1: DALE 0.25W
APPLICATIONS INFORMATION
Figure 6. LTC1872B Layout Diagram (See PC Board Layout Checklist)
L1
M1
BOLD LINES INDICATE HIGH CURRENT PATHS
D1
RS
VOUT
VIN
1872B F06
0.1
µF
CITH
RITH
R2
R1
CIN
+
ITH/RUN
LTC1872B
GND
VFB
6
5
4
1
2
3
NGATE
VIN
SENSE–
COUT
+
TYPICAL APPLICATIO S


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