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LT1534CS Datasheet(PDF) 14 Page - Linear Technology

Part # LT1534CS
Description  Ultralow Noise 2A Switching Regulators
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1534CS Datasheet(HTML) 14 Page - Linear Technology

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14
LT1534/LT1534-1
TYPICAL APPLICATIO S
A Cuk converter is a natural topology for a low noise
converter. The Cuk converter is a dual of a buck boost
converter. C1 is the primary means of storing and trans-
ferring energy. Like a buck boost, the DC transfer function
is approximately VOUT/VIN = DC/(1 – DC). The output
voltage, though negative, can be higher or lower in mag-
nitude from the input. The two inductors can be separate
however, by placing them on the same winding input and
output current ripple can be greatly reduced. The addi-
tional slew control provided by the LT1534 will reduce the
high frequency content even further.
SHDN
SYNC
COL
NFB
LT1534-1
GND
VIN
INPUT VOLTAGE
4V TO 12V
15
2
12
4
5
6
11
1300pF
C1
47
µF
16.9k
33nF
NOTE 1: 25nH TRACE INDUCTANCE
OR COILCRAFT B10T
L1: COILTRONICS CTX20-4
NOTE 1
4.7
µF
L1B
20
µH
L1A
20
µH
MBR320
4.99k
1%
2k
10
1,8,
9,16
1k
1%
–3V
0.7A
1534 TA06
CT
RT
VC
PGND
RVSL
RCSL
FB
3
14
13
7
4.7
µF
Ultralow Noise Regulator for a Thermo-Electric Cooler,
Maintaining Sensitive Electronics at Low Temperatures
VC
L2
22nF
D1
12V
C1
47
µF
16V
RCSL
Q5
2N3904
1534 TA05
VIN
FB
RT
CT
110k
LT1534-1
U1
GND
PGND
1000pF
COL
RVSL
+
C2
47
µF
16V
+
C4
22
µF
16V
+
10k
18k
10k
5.6V
10
Ω
L1
100
µH
1 TO 5
6 TO 10
R1
50m
Ω
0.1
µF
3.3M
2200pF
R4
5.1k
R3
690k
R6
25k
499k
10k
499k
R5
1.6k
2N3904
24k
3.3k
L4
22
µH
+
–
–
+
100k
100
Ω
10k
R2
10k
C3
22
µF
16V
0A TO 1.5A
THERMOELECTRIC
COOLER
+
L3
22
µH
RT
10k
NTC
0.1
µF
U2B
U2A
0.1
µF
0.01
µF
1k
D1: MOTOROLA MBR5320T3
L1: MIDCOM 38440
L2: COILCRAFT B07T
L3, L4: SUMIDA CD43-220
U2A, U2B: LT1490
Ultralow Noise 5V to –3V Cuk Converter



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