LT3580
TYPICAL APPLICATION
Efficiency and Power Loss
vs Load Current
2MHz Inverting Converter Generates –12V from a 5V to 12V Input
C3
90
85
80
75
70
65
60
55
50
1400
1200
1000
800
600
400
200
0
L1
L2
V
= 5V
IN
1μF
10μH
22μH
V
OUT
V
IN
–12V
5V TO 12V
500mA (V = 12V)
350mA (V = 5V)
IN
IN
C2
10μF
D1
V
SW
GND
IN
SHDN
147k
LT3580
RT
FB
VC
SYNC
SS
47pF
10k
2.2nF
C1
2.2μF
45.3k
0.1μF
3580 TA09a
C1: 2.2μF, 25V, X5R, 1206
C2: 10μF, 25V, X5R, 1206
C3: 1μF, 50V, X5R, 0805
200 250
300 350 400
LOAD CURRENT (mA)
0
50 100 150
D1: CENTRAL SEMI CMMSH1-40
L1: SUMIDA CDRH6D28NP-100NC
L2: SUMIDA CDRH3D28NP-220NC
3580 TA09b
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
V : 2.3V to 16V, V
LT1310
2A (I ), 40V, 1.2MHz High Efficiency Step-Up DC/DC
= 40V, I = 3mA, I < 1μA,
OUT(MAX) Q SD
SW
IN
Converter
ThinSOTTM Package
LT1613
550mA (I ), 1.4MHz High Efficiency Step-Up DC/DC
V : 0.9V to 10V, V
= 34V, I = 3mA, I < 1μA,
Q SD
SW
Converter
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
ThinSOT Package
LT1618
1.5A (I ), 1.25MHz High Efficiency Step-Up DC/DC Converter V : 1.6V to 18V, V
= 35V, I = 1.8mA, I < 1μA,
Q SD
SW
IN
MS10 Package
LT1930/LT1930A
1A (I ), 1.2MHz/2.2MHz High Efficiency Step-Up DC/DC
V : 2.6V to 16V, V
= 34V, I = 4.2mA/5.5mA, I
<
<
SW
IN
Q
SD
SD
Converter
1μA,
ThinSOT Package
LT1931/LT1931A
LT1935
1A (I ), 1.2MHz/2.2MHz High Efficiency Inverting DC/DC
V : 2.6V to 16V, V
= 34V, I = 4.2mA/5.5mA, I
OUT(MAX) Q
SW
IN
Converter
1μA,
ThinSOT Package
2A (I ), 40V, 1.2MHz High Efficiency Step-Up DC/DC
V : 2.3V to 16V, V
= 40V, I = 3mA, I < 1μA,
Q SD
SW
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
Converter
ThinSOT Package
LT1944/LT1944-1 Dual Output 350mA (I ), Constant Off-Time, High Efficiency
(Dual)
V : 1.2V to 15V, V
= 34V, I = 20μA, I < 1μA,
Q SD
SW
IN
Step-Up DC/DC Converter
MS10 Package
LT1945 (Dual)
Dual Output Pos/Neg 350mA (I ), Constant Off-Time,
V : 1.2V to 15V, V
= 34V, I = 20μA, I < 1μA,
Q SD
SW
IN
High Efficiency Step-Up DC/DC Converter
MS10 Package
LT1946/LT1946A
LT1961
1.5A (I ), 1.2MHz/2.7MHz High Efficiency Step-Up DC/DC
V : 2.6V to 16V, V
= 34V, I = 3.2mA, I < 1μA,
Q SD
SW
IN
Converter
MS8E Package
1.5A (I ), 1.25MHz High Efficiency Step-Up DC/DC Converter V : 3V to 25V, V
= 35V, I = 0.9mA, I < 6μA,
Q SD
SW
IN
OUT(MAX)
MS8E Package
LT3436
3A (I ), 800kHz, 34V Step-Up DC/DC Converter
V : 3V to 25V, V
= 34V, I = 0.9mA, I < 6μA,
Q SD
SW
IN
OUT(MAX)
TSSOP16E Package
LT3467
1.1A (I ), 1.3MHz High Efficiency Step-Up DC/DC Converter
V : 2.6V to 16V, V
= 40V, I = 1.2mA, I < 1μA,
OUT(MAX) Q SD
SW
IN
ThinSOT, 2mm × 3mm DFN Packages
LT3477
42V, 3A, 3.5MHz Boost, Buck-Boost, Buck LED Driver
V : 2.5V to 25V, V = 40V, Analog/PWM, I < 1μA,
IN
OUT(MAX)
SD
QFN, TSSOP20E Packages
V : 2.5V to 24V, V = 40V, Analog/PWM, I < 1μA,
OUT(MAX) SD
LT3479
3A Full-Featured DC/DC Converter with Soft-Start and Inrush
Current Protection
IN
DFN, TSSOP Packages
3580fc
LT 0508 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
28
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© LINEAR TECHNOLOGY CORPORATION 2007
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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