Linear Technology LTC3558, Руководство пользователя

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LTC3558
8
3558f
Buck Regulator Input Current vs
Temperature, Pulse Skip Mode
Buck and Buck-Boost Regulator
Enable Thresholds
vs Temperature
Buck Regulator PMOS R
DS(0N)
vs Temperature
TEMPERATURE (°C)
–55
100
INPUT CURRENT (μA)
150
250
300
350
–15 25 45 125
3558 G22
200
–35 5 65 85 105
400
FB1 = 0.85V
PV
IN1
= 4.2V
PV
IN1
= 2.7V
TEMPERATURE (°C)
–55
400
R
DS(ON)
(mΩ)
500
700
800
900
65
1300
3558 G23
600
5 –35
85
25 –15
105
45 125
1000
1100
1200
PV
IN1
= 2.7V
PV
IN1
= 4.2V
Buck Regulator NMOS R
DS(0N)
vs Temperature
TEMPERATURE (°C)
–55
400
R
DS(ON)
(mΩ)
500
700
800
900
65
1300
3558 G24
600
5 –35
85
25 –15
105
45 125
1000
1100
1200
PV
IN1
= 2.7V
PV
IN1
= 4.2V
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Regulator Input Current vs
Temperature, Burst Mode Operation
TEMPERATURE (°C)
–55
20
INPUT CURRENT (μA)
25
35
40
45
–15
25
45 125
3558 G21
30
–35 5
65
85 105
50
FB1 = 0.85V
PV
IN1
= 4.2V
PV
IN1
= 2.7V
Buck and Buck-Boost Regulator
Undervoltage Thresholds
vs Temperature
I
LOAD
(mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3558 G25
0
1
V
OUT
= 1.2V
PV
IN1
= 2.7V
PV
IN1
= 4.2V
Burst Mode
OPERATION
PULSE SKIP
MODE
Buck Regulator Effi ciency vs I
LOAD
Buck Regulator Load Regulation
I
LOAD
(mA)
1
1.19
V
OUT
(V)
1.20
1.21
1.22
1.23
10 100 1000
3558 G26
1.18
1.17
1.16
1.15
1.24
1.25
PV
IN1
= 3.6V
V
OUT
= 1.2V
Burst Mode
OPERATION
PULSE SKIP
MODE
Buck Regulator Line Regulation
TEMPERATURE (°C)
–55
2.250
INPUT VOLTAGE (V)
2.300
2.400
2.450
2.500
2.750
2.600
–15
25
45 125
3558 G19
2.350
2.650
2.700
2.550
–35 5
65
85 105
RISING
BAT = PV
IN1
= PV
IN2
FALLING
TEMPERATURE (°C)
–55
400
V
EN
(V)
500
700
800
900
1200
1100
–15 25 45 125
3558 G20
600
1000
–35 5 65 85 105
RISING
BAT = PV
IN1
= PV
IN2
= 3.6V
FALLING
2.700 3.300 3.900 4.200 3.000 3.600
PV
IN1
(V)
V
OUT
(V)
1.170
1.220
1.230
1.240
1.250
1.200
1.160
1.210
1.150
1.190
1.180
3558 G27
I
LOAD
= 200mA
T
A
= 25°C, unless otherwise noted.