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LTC3638 Datasheet(PDF) 20 Page - Linear Technology

Part # LTC3638
Description  High Efficiency, 140V 250mA Step-Down Regulator
PDF  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3638 Datasheet(HTML) 20 Page - Linear Technology

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LTC3638
20
3638fa
For more information www.linear.com/LTC3638
VIN INPUT VOLTAGE (V)
0
85
90
100
95
150
120
3638 F14b
80
75
60
30
60
90
70
65
IOUT = 100mA
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V
VIN INPUT VOLTAGE (V)
0
250
200
150
100
150
120
3638 TA04b
50
30
60
90
VOUT = –5V
VOUT = –15V
OUTPUT
VOLTAGE
500mV/DIV
10ms/DIV
3638 F15b
30 LOAD
CIN: TDK C5750X7R2E105K
COUT: TDK C3216X5R0J226MT
L1: COILCRAFT MSS1278T-334KL
D1: DIODES INC PDS3200
*VOUT = VIN FOR VIN < 5V
3638 F14
VFB
ISET
SW
L1
330µH
VIN
RUN
CIN
1µF
250V
COUT
22µF
VOUT*
5V
250mA
VIN
4V TO 140V
SS
OVLO
VPRG1
VPRG2
LTC3638
GND
FBO
D1
Efficiency vs Input Voltage
TYPICAL APPLICATIONS
4V to 125V Input to –15V Output Positive-to-Negative Regulator
3638 F15
VFB
SS
SW
L1
68µH
VIN
RUN
CIN
1µF
250V
COUT
100µF
VOUT*
3.3V
250mA
VIN
4V TO 140V
ISET
VPRG2
VPRG1
OVLO
LTC3638
GND
FBO
470nF
D1
220pF
CIN: MURATA GRM55DR72E105KW01L
COUT: MURATA GRM43SR60J107ME20
L1: SUMIDA CDRH8D28NP-680NC
D1: VISHAY U1D
220k
3638 TA04a
VFB
ISET
SW
L1
220µH
VIN
RUN
CIN
1µF
250V
COUT
10µF
25V
VOUT
–15V
VIN
4V TO 125V
SS
OVLO
VPRG1
VPRG2
LTC3638
GND
FBO
200k
102k
MAXIMUM LOAD CURRENT
≈
VIN
VIN + VOUT
•
IPEAK
2
D1
MAXIMUM INPUT VOLTAGE = 140 –|VOUT|
CIN: KEMET C2225C105KARACTU
COUT: AVX 12103C106MAT
L1: TDK SLF12555-221MR72
D1: ST MICRO STTH102A
Soft-Start Waveform
Maximum Load Current
vs Input Voltage
Figure 14. High Efficiency 250mA Regulator
Figure 15. Low Output Voltage Ripple 250mA Regulator with 75ms Soft-Start



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