Datasheet

12
LTC1872
1872f LT/TP 0301 4K • PRINTED IN USA
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 R
SENSE
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
 LINEAR TECHNOLOGY CORPORATION 2000
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear-tech.com
TYPICAL APPLICATIO
U
LTC1872 –2.5V to 3.3V/0.5A Boost Converter
RELATED PARTS
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
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× 100µF
10V
V
IN
–2.5V
V
OUT
3.3V
0.5A
M1
D1
+
C1
100µF
10V
+
LTC1872 2.7V to 9.8V Input
to 3.3V/1.2A Output SEPIC Converter
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
U
0.95
(0.037)
REF
1.50 – 1.75
(0.059 – 0.069)
0.35 – 0.55
(0.014 – 0.022)
0.35 – 0.50
(0.014 – 0.020)
SIX PLACES (NOTE 2)
S6 SOT-23 0898
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
1.90
(0.074)
REF
0.90 – 1.45
(0.035 – 0.057)
0.90 – 1.30
(0.035 – 0.051)
0.00 – 0.15
(0.00 – 0.006)
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
2.6 – 3.0
(0.110 – 0.118)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
S6 Package
6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)