Datasheet

LTC3422
5
3422fa
Burst Mode Output Current
Threshold vs R
BURST
(3.3V Output)
FB Voltage vs Temperature
Frequency vs Temperature
(Normalized About 1MHz)
Burst Mode Quiescent Current
vs Temperature
Current Limit vs Temperature
R
DS(ON)
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(T
A
= 25°C, unless otherwise specified)
R
BURST
(kΩ)
50
OUTPUT CURRENT (mA)
120
140
100
80
40
20
350 550 650 750 850
3422 G10
60
0
150 250
450
V
IN
= 1.25V TO 2.9V
V
OUT
= 3.3V
f
OSC
= 1MHz
EXITS BURST (AVE)
ENTERS BURST (MIN)
R
BURST
(kΩ)
50
OUTPUT CURRENT (mA)
120
140
100
80
40
20
275 425 500 575 650
3422 G11
60
0
125 200
350
V
IN
= 1.8V TO 4.2V
V
OUT
= 5V
f
OSC
= 1MHz
EXITS BURST (AVE)
ENTERS BURST (MIN)
TEMPERATURE (°C)
–45
1.213
VOLTAGE (V)
1.214
1.215
1.216
1.217
–30 –15 0 15
3422 G12
30 45 60 75 90
TEMPERATURE (°C)
–45
0.98
FREQUENCY (MHz)
0.99
1.00
1.01
1.02
–30 –15 0 15
3422 G13
30 45 60 75 90
TEMPERATURE (°C)
–45
22
QUIESCENT CURRENT (µA)
24
26
28
30
–30 –15 0 15
3422 G14
30 45 60 75 90
TEMPERATURE (°C)
–45
2.35
CURRENT (A)
2.40
2.45
2.50
2.55
–30 –15 0 15
3422 G15
30 45 60 75 90
No-Load Input Current vs V
IN
Maximum Output Current vs V
IN
Burst Mode Output Current
Threshold vs R
BURST
(5V Output)
TEMPERATURE (°C)
–45
160
RESISTANCE (mΩ)
280
260
240
220
200
180
–30 –15 0 15
3422 G16
30 45 60 75 90
PMOS R
DS(ON)
NMOS R
DS(ON)
INPUT VOLTAGE (V)
0.8
50
INPUT CURRENT (µA)
70
90
100
170
140
1.6
2.4
2.8 4.4
160
150
120
60
80
130
110
1.2 2
3.2
3.6
4
4.8
3422 G17
CHIP ENTERS
Burst Mode OPERATION
V
OUT
= 5V
V
OUT
= 3.3V
INPUT VOLTAGE (V)
1.80
OUTPUT CURRENT (mA)
1200
1400
1600
5.40
3422 G18
1000
800
400
2.40 3.00
3.60
4.20 4.80
600
2000
1800
f
OSC
= 1MHz
V
OUT
= 3.3V V
OUT
= 5V
3.3V DIODE
RECTIFICATION
5V DIODE
RECTIFICATION