LTC3675_12 Datasheet, PDF (9/38 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

LTC3675
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
1A Buck Regulators, Transient
Response (Pulse-Skipping Mode)
1A Buck Regulators, Transient
Response (Burst Mode Operation)
1A Buck Regulators, No Load
Start-Up Transient
(Pulse-Skipping Mode)
V_OUT1
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
50μs/DIV
LOAD STEP = 100mA TO 700mA
V_IN = 3.6V, V_OUT1 = 1.2V
V_OUT1
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
3675 G10
50μs/DIV
LOAD STEP = 100mA TO 700mA
V_IN = 3.6V, V_OUT1 = 1.2V
V_IN = 3.6V
V_OUT1
500mV/DIV
INDUCTOR
CURRENT
500mA/DIV
3675 G11
EN1
2V/DIV
25μs/DIV
3675 G12
1A Buck Regulators,
V_OUT1 vs Temperature
1.25
PULSE-SKIPPING MODE
1.24 _{LOAD = 500mA}
1.23
1.22
1.21
V_IN = 2.7V
1.20
1.19
V_IN = 5.5V
1.18
V_IN = 3.6V
1.17
1.16
1.15
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G13
1A Buck Regulators, PMOS
Current Limit vs Temperature
3.6
3.4
3.2
3.0
V_IN = 5.5V
2.8
2.6
V_IN = 3.6V
2.4
V_IN = 2.7V
2.2
2.0
1.8
1.6
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G14
1A Buck Regulators, Switch
R_DSON vs Temperature
0.60
0.55
0.50
0.45
PMOS R_DSON, V_IN = 2.7V
0.40 _{NMOS RDSON, VIN = 2.7V}
0.35
0.30
0.25
0.20
0.15
NMOS R_DSON, V_IN = 5.5V
0.10
PMOS R_DSON, V_IN = 5.5V
0.05
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G15
500mA Buck Regulators,
Efficiency vs Load
100
90
80
70
60
50
40
V_OUT3 = 1.8V
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 G16
500mA Buck Regulators,
Load Regulation
1.830
PULSE-SKIPPING MODE
1.825
1.820
1.815
1.810
1.805
V_IN = 3.6V
V_IN = 5.5V
1.800
1.795
V_IN = 2.7V
1.790
1.785
1.780
1.775
1.770
1
10
100
1000
LOAD CURRENT (mA)
3675 G17
500mA Buck Regulators,
Line Regulation
1.830
1.825 ^{PULSE-SKIPPING MODE}
1.820
1.815
1.810
1.805
LOAD = 250mA
1.800
1.795
1.790
LOAD = 50mA
1.785
1.780
1.775
1.770
2.7 3.1 3.5 3.9 4.3 4.7
V_IN (V)
5.1 5.5
3675 G18
3675fa
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