Datasheet

LTC3422
15
3422fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO S
U
C
SS
0.1µF
C
C2
22pF
C
C1
1nF
OFF ON
R
Z
15k
C
OUT
*
22µF
C
IN
*
10µF
V
IN
3.1V TO 4.2V
Li-Ion
C
B
2.2nF
*LOCATE COMPONENTS CLOSE TO PINS
C
IN
: TAIYO YUDEN X5R JMK212BJ106MM
C
OUT
: TAIYO YUDEN X5R JMK325BJ226MM
R
T
28k
R1
1.13M
V
OUT
5V
700mA
R2
365k
R
B
90.9k
3422 TA05a
SS
V
C
BURST
SHDN FB
SYNC V
OUT
R
T
GND
V
IN
LTC3422
L1
3µH
SW
+
L1: SUMIDA CDRH6D28-3R0
C
SS
0.1µF
C
C2
22pF
C
C1
1nF
OFF ON
R
Z
15k
C
OUT
*
22µF
C
IN
*
10µF
V
IN
1.8V TO 3.2V
2 CELLS
C
B
2.2nF
*LOCATE COMPONENTS CLOSE TO PINS
C
IN
: TAIYO YUDEN JMK212BJ106MM
C
OUT
: TAIYO YUDEN JMK325BJ226MM
R
T
28k
R1
1.13M
V
OUT
5V
375mA
R2
365k
R
B
931k
3422 TA06a
SS
V
C
BURST
SHDN FB
SYNC V
OUT
R
T
GND
V
IN
LTC3422
L1
3µH
SW
+
L1: SUMIDA CDRH6D28-3R0
Li-Ion to 5V at 700mA Application
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSSES (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3422 TA05b
0
10000
1
1000
100
10
0
1
V
IN
= 3.1V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3.1V
BURST EFFICIENCY
PWM EFFICIENCY
BURST POWER LOSSES
PWM POWER LOSSES
Li-Ion to 5V Efficiency and Power Loss at 1MHz
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSSES (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3422 TA06b
0
10000
1
1000
100
10
0
1
V
IN
= 3.2V
V
IN
= 2.4V
V
IN
= 1.8V
V
IN
= 1.8V
V
IN
= 2.4V
V
IN
= 3.2V
BURST EFFICIENCY
PWM EFFICIENCY
BURST POWER LOSSES
PWM POWER LOSSES
2-Cell to 5V Efficiency and Power Loss at 1MHz2-Cell to 5V at 375mA Application