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| LTC3122_15 Datasheet, PDF (19/26 Pages) Linear Technology – 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect | |||
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Typical Applications
LTC3122
Single Li-Cell to 6V, 5W, 3MHz Synchronous Boost Converter for RF Transmitter
VIN
2.5V TO 4.2V
CIN
4.7µF
L1
1µH
OFF ON
SW
VIN
VOUT
LTC3122
SD
PWM/SYNC
CAP
RT
FB
RT
17.4k
VCC
SGND
VC
PGND
CVCC
4.7µF
CIN, CVCC: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
COUT: 47µF, 10V, X7R, 1812
L1: TDK SPM6530T-1ROM120
C1
100nF
RC
137k
CC
150pF
R1
487k
R2
121k
CF
12pF
VOUT
6V
833mA
VOUT
500mV/DIV
AC-COUPLED
VIN = 3.6V
COUT
47µF
OUTPUT
CURRENT
500mA/DIV
80mA
833mA
100µs/DIV
3122 TA02a
80mA
3122 TA02b
2 AA Cell to 12V Synchronous Boost Converter, 180mA
VIN
1.8V TO 3V
CIN
4.7µF
L1
3.3µH
OFF ON
SW
VIN
VOUT
LTC3122
SD
PWM/SYNC
CAP
RT
FB
RT
57.6k
VCC
SGND
CVCC
4.7µF
VC
PGND
CIN, CVCC: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
COUT: 22µF, 16V, X7R, 1812
L1: TDK SPM6530T-3R3M
C1
100nF
RC
200k
CC
560pF
R1
1.02M
R2
113k
CF
10pF
VOUT
12V
180mA
COUT
22µF
3122 TA03a
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
EFFICIENCY
INPUT CURRENT
0.5
1.6 1.8 2 2.2 2.4 2.6 2.8
VIN (V)
100
90
80
70
60
50
40
30
20
10
0
3 3.2
3122 TA03b
For more information www.linear.com/LTC3122
3122fa
19
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