LT1534C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1534C' PDF : 16 Pages View PDF
LT1534/LT1534-1
TYPICAL APPLICATIO S
Ultralow Noise Regulator for a Thermo-Electric Cooler,
Maintaining Sensitive Electronics at Low Temperatures
L3
R1
22µH
50mΩ
12V
R2
0.1µF 10k
10k
+ C3
22µF
16V
C2 +
47µF
C1 +
D1
47µF
0A TO 1.5A
THERMOELECTRIC
16V
16V
–
0.01µF
COOLER
1000pF
L1
100µH
U2A
+
10Ω
L4
22µH
1 TO 5 6 TO 10
+ C4
22µF
16V
L2
22nF
VIN
110k
FB
PGND
LT1534-1
U1
CT
RT
10k
2200pF 18k
COL
VC
RCSL
RVSL
GND
1k
2N3904
Q5
24k
2N3904
R4
5.1k
R5
1.6k
10k
R3
690k
100Ω
0.1µF
3.3k
+
U2B
–
100k
3.3M
0.1µF
5.6V
499k 499k
R6
25k
10k
RT
10k
NTC
D1: MOTOROLA MBR5320T3
L1: MIDCOM 38440
L2: COILCRAFT B07T
L3, L4: SUMIDA CD43-220
U2A, U2B: LT1490
1534 TA05
Ultralow Noise 5V to –3V Cuk Converter
INPUT VOLTAGE
4V TO 12V
4.7µF
12 SHDN
4 SYNC
15
VIN
2
COL
1300pF
5 CT
16.9k 6 RT
PGND 3
LT1534-1
14
RVSL
13
RCSL
11
VC GND
7
FB
NFB
2k
1,8, 10
9,16
33nF
4.99k
1%
L1A
20µH
L1B
20µH
NOTE 1 C1
47µF
MBR320
1k
1%
NOTE 1: 25nH TRACE INDUCTANCE
OR COILCRAFT B10T
L1: COILTRONICS CTX20-4
–3V A Cuk converter is a natural topology for a low noise
0.7A
converter. The Cuk converter is a dual of a buck boost
4.7µF
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.
1534 TA06
14
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