20
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
© LINEAR TECHNOLOGY CORPORATION 1993
LT/TP 0604 1K REV D • PRINTED IN USA
TYPICAL APPLICATION
U
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
1
2
3
4
5
6
7
14
13
12
11
10
9
8
P-DRIVE
NC
V
IN
C
T
INTV
CC
I
TH
SENSE
–
N-DRIVE
NC
PGND
SGND
SHUTDOWN
NC
SENSE
+
LTC1148HV-5
1µF
1000pF
R
SENSE
**
0.01Ω
SHUTDOWN
*L
33µH
N-CH
IRFZ44
D1
1N5818
VN2222LL
+
C
IN
2700µF
35V
×2
V
IN
10V TO 18V
+
C
OUT
2200µF
16V
×3
V
OUT
5V/8A
C
C
3300pF
R
C
510Ω
C
T
820pF
LTC1148 • F18
MUR110
N-CH
IRFZ44
470nF
220Ω
220Ω
20k
1N4148
22k
100Ω
100Ω
*COILTRONICS CTX33-10-KM
**DALE LVR-3-0.01
2N3906
2N2222
+
Figure 18. All N-Channel 5V/8A High Efficiency Regulator
(Burst Mode Operation Suppressed)
Figure 19. All N-Channel 5V/8A Efficiency
LOAD CURRENT (A)
0.1
60
EFFICIENCY (%)
70
80
100
110
LTC1148 • F19
90
V
IN
= 10V
V
IN
= 14V
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1142 Dual High Efficiency Synchronous Step-Down Switching Regulator Dual LTC1148
LTC1143 Dual High Efficiency Step-Down Switching Regulator Controller Nonsynchronous Dual Output
LTC1147 High Efficiency Step-Down Switching Regulator Controller Nonsynchronous Equivalent to LTC1148, 8-Pin
LTC1149 High Efficiency Synchronous Step-Down Switching Regulator V
IN
< 48V, Standard Threshold MOSFETs
LTC1159 High Efficiency Synchronous Step-Down Switching Regulator V
IN
< 40V, Logic Level MOSFETs
LTC1174 High Efficiency Step-Down and Inverting DC/DC Converter Nonsynchronous 8-Pin Internal Switch
LTC1265 1.2A, High Efficiency Step-Down DC/DC Converter Nonsynchronous Internal Switch
LTC1435A High Efficiency Low Noise Synchronous Step-Down Switching Regulator Synchronous N-Channel, Constant Frequency
LTC1538-AUX Dual High Efficiency, Low Noise, Synchronous Step-Down Auxiliary Linear Regulator, 5V Standby in Shutdown
Switching Regulator
For additional high efficiency application
circuits, see Application Notes 54, 58 and 66
