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