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LTC7138 Datasheet(PDF) 20 Page - Linear Technology

Part # LTC7138
Description  High Efficiency, 140V 400mA Step-Down Regulator
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7138 Datasheet(HTML) 20 Page - Linear Technology

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LTC7138
20
7138f
For more information www.linear.com/LTC7138
VIN INPUT VOLTAGE (V)
0
85
90
100
95
150
120
7138 F13b
80
75
50
60
30
60
90
70
65
55
IOUT = 100mA
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V
VIN INPUT VOLTAGE (V)
0
400
250
200
350
300
150
100
150
120
7138 TA04b
50
30
60
90
VOUT = –5V
VOUT = –15V
OUTPUT
VOLTAGE
500mV/DIV
10ms/DIV
7138 F14b
10 LOAD
L1: COILCRAFT MSS1278T-334KL
D1: DIODES INC PDS3200
*VOUT = VIN FOR VIN < 5V
7138 F13
VFB
ISET
SW
ANODE
L1
330µH
VIN
RUN
CIN
1µF
250V
X7R
COUT
47µF
6.3V
X5R
VOUT*
5V
400mA
VIN
4V TO 140V
SS
OVLO
VPRG1
VPRG2
LTC7138
GND
FBO
D1
Efficiency vs Input Voltage
Typical applicaTions
4V to 125V Input to –15V Output Positive-to-Negative Regulator
7138 F14
VFB
SS
SW
L1
150µH
VIN
RUN
CIN
1µF
250V
X7R
COUT
100µF
×2
6.3V
X5R
VOUT
3.3V
400mA
VIN
4V TO 140V
ISET
VPRG2
VPRG1
OVLO
LTC7138
GND
FBO
470nF
220pF*
L1: SUMIDA CDRH104RNP-151NC
D1: VISHAY U1D
*OPTIONAL COMPONENTS FOR LOWER LIGHT-LOAD OUTPUT VOLAGE RIPPLE
220k*
ANODE
D1
7138 TA04a
VFB
ISET
SW
ANODE
L1
220µH
VIN
RUN
CIN
1µF
250V
X7R
COUT
22µF
25V
X5R
VOUT
–15V
VIN
4V TO 125V
SS
OVLO
VPRG1
VPRG2
LTC7138
GND
FBO
200k
102k
MAXIMUM LOAD CURRENT
≈
VIN
VIN + VOUT
•
3•IPEAK
4
MAXIMUM INPUT VOLTAGE = 140 –|VOUT|
L1: TDK SLF12555-221MR72
D1: ST MICRO STTH102A
D1
Soft-Start Waveform
Maximum Load Current
vs Input Voltage
Figure 13. High Efficiency 400mA Regulator
Figure 14. 3.3V/400mA Regulator with 75ms Soft-Start



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