LT1158
TYPICAL APPLICATIONS
DRIVER SUPPLY 10V TO 15V
(CAN BE POWERED FROM V
V
IN
4.5V TO 6V
IN
WITH LOGIC-LEVEL Q1, Q2)
0.33μF
16k
0.01μF
+
+
BAS16
10μF
1
220μF
10V
16
15
14
13
12
11
10
9
BOOST DR
BOOST
T GATE DR
T GATE FB
T SOURCE
1
2
3
4
8
7
6
5
OS-CON s 4
2
+
200pF
V
Q1
0.01μF
SHORT-CIRCUIT
CURRENT = 22A
LT1431
0.22μF
3
4.99k
1%
BIAS
500k
L1
R
S
8μH
+
–
4
V
OUT
ENABLE
FAULT
SHUTDOWN
3.3k
15A
LT1158
+
0.01Ω
EA
5
6
7
8
330μF
6.3V
AVX s 4
+
SENSE
1000pF
1
2
3
4
8
7
6
5
–
INPUT
SENSE
470pF
+
GND
V
CMOS
555
24k
R
X
Q2
B GATE FB
B GATE DR
1%
LT1158 F11
L1: COILTRONICS CTX02-12171-1
S
Q1, Q2: MTB75N05HD (USE WITH 10V TO 15V DRIVER SUPPLY)
V
R
2.90V 3.05V 3.30V 3.45V 3.60V
(1%) 806Ω 1.10k 1.62k 1.91k 2.21k
OUT
R : KRL/BANTRY SL-1R010J s 2
MTB75N03HDL (USE WITH V DRIVER SUPLY)
IN
X
CMOS 555: LMC555 OR TLC555
Figure 11. 5V to 3.XXV,15A Converter (Uses PC Board Area for Heatsink)
8V TO 20V INPUT
1N4148
100k
s
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
+
BOOST DR
BOOST
500μF
IRFZ34
510k
VP0300
LOW ESR
+
V
T GATE DR
T GATE FB
T SOURCE
SHORT-CIRCUIT
CURRENT = 6A
0.01μF
INSERT FOR
ZERO POWER
SHUTDOWN
BIAS
0.1μF
L1
50μH
R
S
20mΩ
+5V/4A
OUTPUT
ENABLE
FAULT
INPUT
GND
+
100k
+
–
10μF
+
LT1158
2N2222
100Ω
100Ω
1000μF
+
SENSE
CMOS
ON/OFF
LOW ESR
–
SENSE
IRFZ44
1N4148
+
V
B GATE FB
B GATE DR
24k
510Ω
L1: COILTRONICS
CTX50-5-52
1
2
3
4
8
7
6
5
1000pF
0.05μF
1k
R : VISHAY/DALE TYPE LVR-3
S
VISHAY/ULTRONIX RCS01, SM1
ISOTEK CORP. ISA-PLAN SMR
LT1431
CONSTANT OFF TIME CURRENT MODE CONTROL LOOP
SEE FIGURE 4 FOR EFFICIENCY CURVE
1
V
OUT
FREQUENCY =
WHERE t
≈ 10μs
OFF
1 –
(
)
LT1158 F12
t
V
IN
OFF
Figure 12. High Efficiency 5V Step-Down Switching Regulator (Requires No Heatsinks)
1158fb
17
LINEAR_DIMENSIONS [ Linear Dimensions ]
