Datasheet

LT3958
30
3958fa
For more information www.linear.com/LT3958
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0917 REV A • PRINTED IN USA
www.linear.com/LT3958
Typical applicaTions
PART NUMBER DESCRIPTION COMMENTS
LT3580 Boost/Inverting DC/DC Converter with 2A Switch,
Soft-Start and Synchronization
2.5V ≤ V
IN
≤ 32V, Current Mode Control, 200kHz to 2.5MHz, 3mm × 3mm
DFN-8, MSOP-8E
LT3573 Isolated Flyback Switching Regulator with 60V
Integrated Switch
3V ≤ V
IN
≤ 40V, Up to 7W, No Opto-Isolator or Third Winding Required,
MSOP-16E
LT3574 Isolated Flyback Switching Regulator with 60V
Integrated Switch
3V ≤ V
IN
≤ 40V, Up to 3W, No Opto-Isolator or Third Winding Required,
MSOP-16E
LT3757 Boost, Flyback, SEPIC and Inverting Controller 2.9V ≤ V
IN
≤ 40V, Current Mode Control, 100kHz to 1MHz Programmable
Operation Frequency, 3mm × 3mm DFN-10 and MSOP-10E Package
LT3758 Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ V
IN
≤ 100V, Current Mode Control, 100kHz to 1MHz Programmable
Operation Frequency, 3mm × 3mm DFN-10 and MSOP-10E Package
LT C
®
1871/LTC1871-1/
LTC1871-7
Wide Input Range, No R
SENSE
™ Low Quiescent
Current Flyback, Boost and SEPIC Controller
Adjustable Switching Frequency, 2.5V ≤ V
IN
≤ 36V, Burst Mode Operation at
Light Load
LT3825 Isolated No-Opto Synchronous Flyback Controller V
IN
16V to 75V Limited by External Components, Up to 60W,
Current Mode Control
LT3837 Isolated No-Opto Synchronous Flyback Controller
V
IN
4.5V to 36V Limited by External Components, Up to 60W,
Current Mode Control
LT1725 Isolated No-Opto Flyback Controller V
IN
16V to 75V Limited by External Components, Current Mode Control
LT1737 Isolated No-Opto Flyback Controller V
IN
4.5V to 36V Limited by External Components, Current Mode Control
LTC3803/LTC3803-5 200kHz Flyback DC/DC Controller V
IN
and V
OUT
Limited Only by External Components, ThinSOT™ Package
LTC3805/LTC3805-5 Adjustable Fixed 70kHz to 700kHz Operating
Frequency Flyback Controller
V
IN
and V
OUT
Limited Only by External Components, 3mm × 3mm DFN-10,
MSOP-10E
LT1619 Boost, SEPIC and Flyback Current Mode PWM
Controller
1.9V ≤ V
IN
≤ 18V, 300kHz Fixed Operating Frequency
relaTeD parTs
5V Output Nonisolated Flyback Power Supply
Efficiency vs Output Current
SENSE2
FBX
SENSE1
LT3958
T1
3:1
V
IN
SW GND
RT SS
INTV
CC
EN/UVLO
SYNC
SGND
32.4k
VC
3958 TA06a
D1
200k
63.4k
200kHz
4.7µF
10V
X5R
0.47µF
10k
10nF
100pF
34k
1%
15.8k
1%
C
OUT
100µF
6.3V
V
OUT
5V
2A
V
IN
10V TO 40V
C
IN
4.7µF
50V
X5R
T1: COILTRONICS VP2-0066
•
•
0.1µF
50V
1.8k
1W
D
SN
OUTPUT CURRENT (A)
50
EFFICIENCY (%)
60
55
65
70
75
80
85
90
3958 TA05b
0 0.5 1 1.5 2
V
IN
= 24V
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