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LTC3121 Datasheet(PDF) 21 Page - Linear Technology

Part # LTC3121
Description  15V, 1.5A Synchronous Step-Up DC/DC Converter with Output Disconnect
PDF  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3121 Datasheet(HTML) 21 Page - Linear Technology

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LTC3121
21
3121fa
For more information www.linear.com/LTC3121
Typical applicaTions
2 AA Cell to 12V Synchronous Boost Converter, 100mA
3121 TA04a
VIN
SD
PWM/SYNC
RT
VCC
VOUT
CAP
FB
VC
LTC3121
SGND
PGND
RC
200k
CC
560pF
SW
L1
6.8µH
R2
113k
R1
1.02M
CF
10pF
CVCC
4.7µF
C1
100nF
COUT
22µF
VOUT
12V
100mA
RT
57.6k
VIN
1.8V TO 3V
CIN
4.7µF
ON
OFF
CIN, CVCC: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
COUT: 22µF, 16V, X7R, 1812
L1: COILCRAFT XAL5050-682ME
VIN (V)
1.6
1.2
0.6
1.0
0.8
0.4
0.2
100
90
70
50
40
80
60
30
20
10
0
2.2 2.4 2.6 2.8
1.8
3121 TA04b
2
3.2
3
EFFICIENCY
INPUT CURRENT
3.3V to 12V, 300kHz Synchronous Boost Converter with Output Disconnect, 250mA
3121 TA05a
VIN
SD
PWM/SYNC
RT
VCC
VOUT
CAP
FB
VC
LTC3121
SGND
PGND
RC
154k
CC
1.2nF
SW
L1
22µH
R2
113k
R1
1.02M
CF
56pF
CVCC
4.7µF
C1
100nF
COUT
68µF
VOUT
12V
250mA
RT
196k
VIN
3.3V
CIN
4.7µF
ON
OFF
PWM
BURST
CIN, CVCC: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
COUT: 68µF, 16V, X7R, 1812
L1: COILCRAFT XAL6060-223ME
LOAD CURRENT (mA)
0.01
100
80
90
60
40
30
70
50
20
10
0
10
1
0.1
0.01
10
100
0.1
3121 TA05b
1
PWM
Burst Mode OPERATION
PWM POWER LOSS



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