Datasheet

16
LT1575/LT1577
TYPICAL APPLICATIONS N
U
12V to 3.3V/9A (14A Peak) Hybrid Regulator
Transient Response to a 10A Load Step
50mV/DIV
200µs/DIV
1575/77 TA17
+
+ + + +
1575/77 TA16
TG
SW
BOOST
INTV
CC

BG
S
+

S
–
EXTV
CC

C
OSC

RUN/SS
I
TH

SFB
SGND

V
OS
9
1
2
3
4
5
6
16
14
15
12
11
8
7
13
10
C4, 4.7µF
C5
0.1µF
D2
MBRS330T3
R8
15K
R3
100
R4
100
C18
1000µF
10V
C20
1000µF
10V
C19
1000µF
10V
R6
0.0075Ω
L1
4µH
C2, 1000pF
V
IN
LTC1435
C21, 10pF
C22, 1000pF
R2
1.21k
1%
C1, 470pF
R9
2k
Q1
IRLZ44
R1
2.1k, 1%
V
CORE
3.3V
1
2
3
4
8
7
6
5
PGND
D1, CMDSH-3
Q3
Q2
C16
1µF
C14
150µF
16V
C15
1µF
C17
1µF
12V
C11
150µF
16V
C12
150µF
16V
C13
150µF
16V
C3, 0.1µF
C9
1500pF
R5
16.5k
C10, 1000pF
C8, 68pF
C7, 0.1µF
R7
35.7k
+
C23
1µF
C6
0.1µF
12V
1µF
X7R
CERAMIC
0805 CASE
×40
+
+
 L1=COILTRONICS CTX02-13199
 Q2, Q3 =SILICONIX SUD50N03-10
LT1575
SHDN
V
IN

GND
OUT
IPOS
INEG
GATE
COMP