LTC7138
24
7138f
For more information www.linear.com/LTC7138
LINEAR TECHNOLOGY CORPORATION 2015
LT 0115 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC7138
relaTeD parTs
Typical applicaTion
12V/400mA Automotive Supply
*V
OUT
≅ V
IN
FOR V
IN
< 12V
V
OUT
12V*
7138 TA07
V
FB
I
SET
SW
ANODE
220µH
V
IN
RUN
C
IN
1µF
250V
X7R
C
OUT
22µF
16V
X7R
V
IN
SS
OVLOV
PRG1
V
PRG2
LTC7138
GND
FBO
267k
196k
L1: COILCRAFT MSS1246T-224KL
D1: DIODES INC SBR1U200P1-7
D1
PART NUMBER DESCRIPTION COMMENTS
LTC3638 140V, 250mA Micropower Step-Down DC/DC Regulator V
IN
: 4V to 140V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 1.4µA,
MS16E Package
LTC3639 150V
, 100mA Synchronous Micropower Step-Down
DC/DC Regulator
V
IN
: 4V to 150V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 1.4µA,
MS16E Package
LTC3637 76V
, 1A High Efficiency Step-Down DC/DC Regulator V
IN
: 4V to 76V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 3µA,
3mm × 5mm DFN16, MSOP16E Packages
LTC3630A 76V
, 500mA Synchronous Step-Down DC/DC Regulator V
IN
: 4V to 76V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 5µA,
3mm × 5mm DFN16, MSOP16E Packages
LTC3810 100V Synchronous Step-Down DC/DC Controller
V
IN
: 6.4V to 100V, V
OUT(MIN)
= 0.8V, I
Q
= 2mA, I
SD
< 240µA,
SSOP28 Package
LTC3631/L
TC3631-3.3
LTC3631-5
45V (Transient to 60V), 100mA Synchronous Step-Down
DC/DC Regulator
V
IN
: 4.5V to 45V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
< 3µA,
3mm × 3mm DFN8, MSOP8 Packages
LTC3642 45V (T
ransient to 60V), 50mA Synchronous Step-Down
DC/DC Regulator
V
IN
: 4.5V to 45V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
< 3µA,
3mm × 3mm DFN8, MSOP8 Packages
LTC3632 50V (T
ransient to 60V), 20mA Synchronous Step-Down
DC/DC Regulator
V
IN
: 4.5V to 45V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
< 3µA,
3mm × 3mm DFN8, MSOP8 Packages
LTC3891 60V Synchronous Step-Down DC/DC Controller with
Burst Mode Operation
V
IN
: 4V to 60V, V
OUT(MIN)
= 0.8V, I
Q
= 50µA, I
SD
< 14µA,
3mm × 4mm QFN20, TSSOP20E Packages
LTC4366-1/L
TC4366-2 High Voltage Surge Stopper V
IN
: 9V to >500V, Adjustable Output Clamp Voltage, I
SD
< 14µA,
2mm × 3mm DFN8, TSOT-8 Packages
Efficiency and Power Loss vs
Load Current
V
IN
= 24V
V
IN
= 48V
V
IN
= 120V
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
20
10
80
50
70
10
1
100
60
40
0
EFFICIENCY
POWER LOSS
1000
0.1 100 1000101