Datasheet

LTC3122
20
3122fa
For more information www.linear.com/LTC3122
Typical applicaTions
3.3V to 12V, 300kHz Synchronous Boost Converter with Output Disconnect, 500mA
USB/Battery Powered Synchronous Boost Converter, 4.3V to 5V, 1A
3122 TA04a
V
IN
SD
PWM/SYNC
RT
V
CC
V
OUT
CAP
FB
V
C
LTC3122
SGND PGND
R
C
154k
C
C
1.2nF
SW
L1
10µH
R2
113k
R1
1.02M
C
F
56pF
C
VCC
4.7µF
C1
100nF
C
OUT
68µF
V
OUT
12V
500mA
R
T
196k
V
IN
3.3V
C
IN
4.7µF
ONOFF
PWMBURST
C
IN
, C
VCC
: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
C
OUT
: 68µF, 16V, X7R, 1812
L1: COILCRAFT MSS1048-103MLB
3122 TA05a
V
IN
SD
PWM/SYNC
RT
V
CC
V
OUT
CAP
FB
V
C
LTC3122
SGND PGND
R
C
43.2k
C
C
1nF
SW
L1
3.3µH
R2
121k
R1
383k
C
F
68pF
C
VCC
4.7µF
C1
100nF
C
OUT
100µF
V
OUT
5V
1A
R
T
57.6k
V
IN
4.3V TO 5.5V
C
IN
4.7µF
C2
4.7µF
ONOFF
C
IN
, C
VCC
: 4.7µF, 6.3V, X7R, 1206
C1: 100nF, 6.3V, X7R, 1206
C
OUT
: 100µF, 6.3V, X7R, 1812
C2: LELON VE-4R7M1ATR-0305
L1: TDK SPM6530T-3R3M
LOAD CURRENT (mA)
0.01
EFFICIENCH (%)
100
80
90
60
40
30
70
50
20
10
0
POWER LOSS (W)
10
1
0.1
0.01
10 1000.1
3122 TA04b
1
PWM
Burst Mode OPERATION
PWM POWER LOSS
2ms/DIV
3122 TA05b
INPUT
CURRENT
0.5A/DIV
V
OUT
2V/DIV
V
IN
2V/DIV
R
LOAD
= 20Ω
V
IN
= USB 2.0
PORT HOTPLUGGED