LTC1159 Datasheet, PDF (17/20 Pages) Linear Technology – High Efficiency Synchronous Step-Down Switching Regulators

U
TYPICAL APPLICATIO S
LTC1159/LTC1159-3.3/LTC1159-5
V_IN
15V TO 40V
1N4148
1N4148
+
IRF9Z34
HEAT SINK
100µF
63V × 2
SXC
1µF
WIMA
5M
1
P-GATE
CAP ¹⁶
0.1µF
0.15µF
2
V_IN
3
V_CC
15
SHDN2
EXTV_CC ¹⁴
L*
50µH
R_SENSE**
0.02Ω
V_OUT
12V/5A
4
P-DRIVE
13
N-GATE
+
5
V_CC
LTC1159
P-GND
12
3.3µF
6
C_T
S-GND ¹¹
390pF
7
I_TH
10
V_FB
3300pF _{8 SENSE–}
SENSE^{+ 9}
470Ω
100pF
1000pF
IRFZ44
MBR350
10.5k 90.9k
1%
1%
100Ω
100Ω
150µF
16V × 2
OS-CON
LTC1159 • F13
VN2222LL
0V = NORMAL
>3V = SHUTDOWN
*COILTRONICS CTX50-5-KM
**IRC LO-3-0.02 ±5%
Figure 13. High Efficiency 15V to 40V Input 12V/5A Output Regulator
BAS16 BAS16
V_IN
5.5V TO 24V
Si9435DY
Si9435DY
+ 47µF
25V × 2
OS-CON
1µF
WIMA
1
P-GATE
CAP ¹⁶
0.22µF
0.33µF
2
V_IN
3
V_CC
4
P-DRIVE
SHDN2
15
0V = NORMAL
>2V = SHUTDOWN
14
EXTV_CC
13
N-GATE
Si9410DY
+
2.2µF
1000pF
5
V_CC
6
C_T
7
I_TH
LTC1159
P-GND
12
11
S-GND
V_FB ¹⁰
56pF 24.9k
1%
2200pF _{8 SENSE–}
SENSE^{+ 9}
1k
100Ω
1000pF
100Ω
BAS16
+
10µF
T*
•
•
MBRS140T3
1µF
•
BAS16 100k
Si9410DY
124k
1%
102k
1%
0.01µF _1k
R_SENSE**
0.02Ω
*HURRICANE LAB HL-8700
**KRL SL-1-R020J
220µF
10V × 4
AVX
BAS16
LTC1159 • F14
5V
OUTPUT
220µF
10V × 2
AVX
3.3V
OUTPUT
Figure 14. 17W Dual Output High Efficiency 5V and 3.3V Regulator
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