LTC3675 Datasheet, PDF (8/36 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

LTC3675
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Undervoltage Threshold
vs Temperature
2.70
2.65
2.60
V_{IN_RISING}
2.55
2.50
V_{IN_FALLING}
2.45
2.40
2.35
2.30
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G01
Enable Threshold vs Temperature
900
ALL REGULATORS AND LED
850 _{DRIVER DISABLED, VIN = 3.6V}
800
750
700
650
EN RISING
600
550
EN FALLING
500
450
400
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G04
Input Supply Current
vs Temperature
50
ALL REGULATORS AND LED
45 DRIVER IN SHUTDOWN
40
35
30
25
V_IN = 3.6V
V_IN = 5.5V
20
15
V_IN = 2.7V
10
5
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G02
Enable Pin Precision Threshold
vs Temperature
420
THRESHOLD MEASURED WITH A
415 ^{REGULATOR ENABLED, V}IN ^{= 3.6V}
410
405
EN RISING
400
395
EN FALLING
390
385
380
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G05
Oscillator Frequency
vs Temperature
2.50
2.45
2.40
2.35
2.30
V_IN = 5.5V
V_IN = 3.6V
2.25
2.20
V_IN = 2.7V
2.15
2.10
2.05
2.00
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G03
1A Buck Regulators,
Efficiency vs Load
100
V_OUT = 1.2V
90
80
70
60
50
40
V_IN = 2.7V Burst Mode OPERATION
30
V_IN = 3.6V Burst Mode OPERATION
20
V_IN = 5.5V Burst Mode OPERATION
V_IN = 2.7V PULSE SKIPPING-MODE
10
V_IN = 3.6V PULSE SKIPPING-MODE
V_IN = 5.5V PULSE SKIPPING-MODE
0
1
10
100
1000
LOAD CURRENT (mA)
3675 G06
1A Buck Regulators,
Efficiency vs Load
100
90
80
70
60
50
40 ^{VOUT = 2.5V}
V_IN = 2.7V Burst Mode OPERATION
30
V_IN = 3.6V Burst Mode OPERATION
20
V_IN = 5.5V Burst Mode OPERATION
V_IN = 2.7V PULSE SKIPPING-MODE
10
V_IN = 3.6V PULSE SKIPPING-MODE
V_IN = 5.5V PULSE SKIPPING-MODE
0
1
10
100
1000
LOAD CURRENT (mA)
3675 G06
1A Buck Regulators,
Load Regulation
1.220
PULSE-SKIPPING MODE
1.216
1.212
1.208
1.204
1.200
V_IN = 5.5V
V_IN = 2.7V
1.196
V_IN = 3.6V
1.192
1.188
1.184
1.180
1
10
100
LOAD CURRENT (mA)
1000
3675 G08
1A Buck Regulators,
Line Regulation
1.220
PULSE-SKIPPING MODE
1.216
1.212
1.208
LOAD = 500mA
1.204
1.200
1.196
LOAD = 100mA
1.192
1.188
1.184
1.180
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_IN (V)
3675 G09
3675f
8