LTC1148-5_15 Datasheet, PDF (16/20 Pages) Linear Technology – High Efficiency Synchronous Step-Down Switching Regulators

LTC1148
LTC1148-3.3/LTC1148-5
U
TYPICAL APPLICATIO S
1/2 Si4532
V_IN
5.2V TO 18V
+
D1
MBRS140T3
C_IN
100µF
25V
1/2 Si4532
+ ^1µF
C_T
390pF
C_C
3300pF
R_C
1k
1 _{P-DRIVE N-DRIVE} 14
2 _NC
NC ¹³
LTC1148HV-5
3 _VIN
PGND ¹²
*L
100µH
4 _CT
11
SGND
5
10
INTV_CC SHUTDOWN
SHUTDOWN
6
I_TH
9
NC
7 _{SENSE– SENSE+} 8
1000pF
*COILTRONICS CTX100-4 Kool Mµ CORE
**KRL SP-1/2-A1-0R100
+
R_SENSE**
0.1Ω
C_OUT
220µF
10V
AVX
V_OUT
5V/1A
LTC1148 • F10
Figure 10. 5V/1A High Efficiency Regulator
with Extended Input Voltage Range
1/2 Si4532
V_IN
4V TO 18V
+
D1
MBRS140T3
C_IN
100µF
25V
1/2 Si4532
+ ^1µF
C_T
300pF
C_C
3300pF
R_C
1k
1 _{P-DRIVE N-DRIVE} 14
2 _NC
NC ¹³
3
LTC1148HV-3.3
V_IN
PGND
12
*L
50µH
4
C_T
11
SGND
5
10
INTV_CC SHUTDOWN
SHUTDOWN
6 _ITH
9
NC
7 _{SENSE– SENSE+} 8
1000pF
*COILTRONICS CTX50-4 Kool Mµ CORE
**IRC LR2010-01-R100-G
+
R_SENSE**
0.1Ω
C_OUT
220µF
10V
OS-CON
V_OUT
3.3V/1A
LTC1148 • F11
Figure 11. High Efficiency 5V to 3.3V/1A Converter
with Extended Input Voltage Range
16
C_T
390pF
IRF7204
V_IN
8V TO 14V
+
D1
MBRS140T3
C_IN
330µF
20V
IRF7201
1 _P-DRIVE
14
N-DRIVE
+ ^1µF
2 _NC
13
NC
LTC1148
3 _VIN
12
PGND
*L
50µH
4
C_T
11
SGND
5
10
INTV_CC SHUTDOWN
SHUTDOWN
R1
100pF
10k
1%
10nF
6 _ITH
9
V_FB
C_C
3300pF
7 _SENSE–
SENSE^{+ 8}
R2
30k
R_C
220Ω
1%
0.01µF
R_SENSE**
0.033Ω
*COILTRONICS CTX50-2-MP
**KRL SL-1-C1-0R033J
( ) ^{VOUT =}
1
+
R2
R1
1.25V
VALUES SHOWN FOR V_OUT = 5V
C_OUT
220µF
+ ^10V
×2
OS-CON
V_OUT
5V/3A
LTC1148 • F12
Figure 12. High Efficiency Adjustable 3A Regulator
114835fd