Linear Technology LTC1872, Manual

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LTC1872
14
1872fa
For more information www.linear.com/LTC1872

LINEAR TECHNOLOGY CORPORATION 2000
1872f LT/TP 0915 4K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX : (408) 434-0507
●
www.linear.com/LTC1872
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT1304 Micropower DC/DC Converter with Low-Battery Detector 120µA Quiescent Current, 1.5V ≤ V
IN
≤ 8V
LT1610 1.7MHz, Single Cell Micropower DC/DC Converter 30µA Quiescent Current, V
IN
Down to 1V
LT1613 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 Internally Compensated, V
IN
Down to 1V
LT1619 Low Voltage Current Mode PWM Controller 8-Lead MSOP Package, 1.9V ≤ V
IN
≤ 18V
LT1680 High Power DC/DC Step-Up Controller Operation Up to 60V, Fixed Frequency Current Mode
LTC1624 High Efficiency SO-8 N-Channel Switching Regulator Controller 8-Pin N-Channel Drive, 3.5V ≤ V
IN
≤ 36V
LT1615 Micropower Step-Up DC/DC Converter in SOT-23 20µA Quiescent Current, V
IN
Down to 1V
LTC1700 No RSENSE Synchronous Current Mode DC/DC Step-Up Controller 95% Efficient, 0.9V ≤ V
IN
≤ 5V, 550kHz Operation
LTC1772 Constant Frequency Current Mode Step-Down DC/DC Controller V
IN
2.5V to 9.8V, I
OUT
up to 4A, SOT-23 Package
LTC3401/LTC3402 1A/2A, 3MHz Micropower Synchronous Boost Converter 10-Lead MSOP Package, 0.5V ≤ V
IN
≤ 5V
I
TH
/RUN
LTC1872
10k
R1
0.034Ω
332k
U1
80.6k 180k
L1
4.7µH
220pF
0.1µF
CERAMIC
C1, C2: AVX TPSE107M010R0100
D1: MOTOROLA MBR2045CT
L1: COILTRONICS UP2B-4R7
M1: Si9804DV
R1: DALE 0.25W
U1: PANASONIC 2SB709A
GND
V
FB
5
4
6
1872 TA03
1
2
3
NGATE
V
IN
SENSE
–
C2
2¥ 100F
10V
V
IN
–2.5V
V
OUT
3.3V
0.5A
M1 D1
+
C1
100µF
10V
+
I
TH
/RUN
LTC1872
R
C1
10k
R
CS
0.03Ω
L1A L1B
C
C1
220pF
GND
V
FB
5
4
6
1872 TA05
1
2
3
NGATE
V
IN
SENSE
–
C
IN
10µF
10V, X5R
V
IN
2.7V TO 9.8V
V
OUT
3.3V/1.2A
C01
180µF
4V, SP
+
M1
CS
4.7µF
10V
D1
MBRM120
R
f1
252k
R
f2
80.6k
FOR V
OUT
= 5V CHANGE
R
f1
TO 427kΩ AND
C
01
TO 150µF, 6V PANASONIC
SP TYPE CAPACITOR
C
IN
, CS; TOKO, MURATA OR TAIYO YUDEN
C
01
: PANASONIC EEFUE0G181R
L1: BH ELECTRONICS 511-1012
M1: IRLMS2002
R
CS
: DALE OR IRC
LTC1872 –2.5V to 3.3V/0.5A Boost Converter
LTC1872 2.7V to 9.8V Input
to 3.3V/1.2A Output SEPIC Converter