Datasheet

16
LT1533
TYPICAL APPLICATIONS
U
Low Noise 5V to –12V Forward Push-Pull Converter. Output Noise Is Below 100µV.
Noise Performance Is Identical to Positive Output Version. See AN70 for Details
SHDN
DUTY
SYNC

COL A
COL B
PGND
R
VSL

R
CSL

NFB
FB
LT1533
GND
V
IN
5V
14
2
15
16
13
12
8
11
3
4
5
6
10

3300pF
18k
0.01µF
15k
L1
4.7µF
15k
+
T1
1N4148
1N4148
L2
100µH
L3
100µH
2.4k
1%
79
9.6k
1%
47µF
+
+
47µF
 L1: 22nH INDUCTOR. COILCRAFT B-07T TYPICAL,
 TRACE INDUCTANE OR BEAD
 L2, L3: COILTRONICS CTX100-3 
 T1: COILTRONICS CTX02-13665-X1

–12V
1533 TA03
C
T

R
T
V
C
OPTIONAL FOR
LOWEST RIPPLE
()
SHDN
DUTY
SYNC

COL A
COL B
PGND
R
VSL

R
CSL

FB
NFB
LT1533
GND
V
IN
2.7V TO 4V
(3 NiCd BATTERIES)
14
2
15
16
13
12
7
11
3
4
5
6
10

3300pF
18k
0.01µF
15k
L2
4.7µF
15k
+
T1
L1
100µH
L3
100µH
3.48k
1%
89
21.5k
1%
47µF
+
47µF
9V
1N4148
1N4148
 L1, L3: COILTRONICS CTX100-3
 L2: 22nH TRACE INDUCTANCE, FERRITE BEAD OR
 INDUCTOR COILCRAFT B-07T TYPICAL
 T1: CTX02-13665-X1
1533 TA04
+
C
T

R
T
V
C
OPTIONAL FOR
LOWEST RIPPLE
()
Electronic Equivalent of 9V Battery Operates from Three NiCd Cells.
Output Noise Is Below 100µV. See AN70 for Details