LTC1872BES6 Ver la hoja de datos (PDF) - Linear Technology
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LTC1872BES6 Datasheet PDF : 12 Pages
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LTC1872B
TYPICAL APPLICATIO S
LTC1872B – 2.5V to 3.3V/0.5A Boost Converter
0.1µF
CERAMIC
10k
220pF
1
5
ITH/RUN VIN
LTC1872B
2
GND
SENSE– 4
3
VFB
6
NGATE
+ C1
100µF
10V
R1
0.034Ω
L1
4.7µH
M1 D1
C2
2× 100µF
10V
332k
VOUT
3.3V
0.5A
U1
VIN
–2.5V
C1, C2: AVX TPSE107M010R0100
D1: MOTOROLA MBR2045CT
L1: COILTRONICS UP2B-4R7
M1: Si9804DV
R1: DALE 0.25W
U1: PANASONIC 2SB709A
80.6k
180k
1872B TA03
LTC1872B 2.7V to 9.8V Input to 3.3V/1.2A Output SEPIC Converter
CC1
220pF
RC1
10k 1
ITH/RUN
5
VIN
Rf2
80.6k
LTC1872B
2
GND
SENSE– 4
3
VFB
6
NGATE
Rf1
252k
RCS
0.03Ω
L1A
L1B
+
D1
MBRM120
CS
4.7µF
10V
VIN
CIN
2.7V TO 9.8V
10µF
10V, X5R
CO1
180µF
4V, SP
VOUT
3.3V/1.2A
M1
CIN, CS; TOKO, MURATA OR TAIYO YUDEN
CO1: PANASONIC EEFUE0G181R
L1: BH ELECTRONICS 511-1012
M1: IRLMS2002
RCS: DALE OR IRC
1872B TA05
FOR VOUT = 5V CHANGE
Rf1 TO 427kΩ AND
CO1 TO 150µF, 6V PANASONIC
SP TYPE CAPACITOR
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120µA Quiescent Current, 1.5V ≤ VIN ≤ 8V
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20µA Quiescent Current, VIN Down to 1V
95% Efficient, 0.9V ≤ VIN ≤ 5V, 550kHz Operation
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With Burst Mode Operation for Higher Efficiency at Light
Load Current
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12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com
1872bf LT/TP 0601 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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