LTC3675_15 Datasheet, PDF (10/38 Pages) Linear Technology – 7-Channel Configurable High Power PMIC

LTC3675/LTC3675-1
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
500mA Buck Regulators Transient
Response (Pulse-Skipping Mode)
500mA Buck Regulators Transient
Response (Burst Mode Operation)
500mA Buck Regulators No Load
Start-Up Transient
(Pulse-Skipping Mode)
V_OUT3
100mV/DIV
AC-COUPLED
V_OUT3
100mV/DIV
AC-COUPLED
V_IN = 3.6V
V_OUT3
500mV/DIV
INDUCTOR
CURRENT
100mA/DIV
50µs/DIV
LOAD STEP = 50mA to 300mA
V_IN = 3.6V, V_OUT3 = 1.8V
INDUCTOR
CURRENT
100mA/DIV
36751 G19
50µs/DIV
LOAD STEP = 50mA to 300mA
V_IN = 3.6V, V_OUT3 = 1.8V
INDUCTOR
CURRENT
500mA/DIV
36751 G20
EN
2V/DIV
25µs/DIV
36751 G21
500mA Buck Regulators,
V_OUT3 vs Temperature
1.90
PULSE-SKIPPING MODE, LOAD = 250mA
1.88
1.86
1.84
1.82
V_IN = 5.5V
1.80
1.78
1.76
V_IN = 3.6V
V_IN = 2.7V
1.74
1.72
1.70
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
36751 G22
500mA Buck Regulators, PMOS
Current Limit vs Temperature
1.50
1.45
1.40
1.35
1.30
1.25
1.20
V_IN = 5.5V
1.15
V_IN = 3.6V
1.10
1.05
V_IN = 2.7V
1.00
0.95
0.90
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
36751 G23
Ganged Buck Regulators 1 and 2,
Efficiency vs Load
100
95 ^{VIN = 3.6V, VOUT1 = 1.2V}
90
85
80
75
Burst Mode OPERATION
70
65
PULSE-SKIPPING MODE
60
55
50
45
40
1
10
100
1000 10000
LOAD CURRENT (mA)
36751 G25
Boost Regulator,
Efficiency vs Load
100
90
80
70
60
50
40
V_OUT5 = 5V
30
V_IN = 2.7V Burst Mode OPERATION
V_IN = 3.6V Burst Mode OPERATION
20
V_IN = 1.2V Burst Mode OPERATION
V_IN = 2.7V PWM MODE
10
V_IN = 3.6V PWM MODE
0
V_IN = 4.2V PWM MODE
1
10
100
1000
LOAD CURRENT (mA)
36751 G26
10
For more information www.linear.com/LTC3675
500mA Buck Regulators, Switch
R_DSON vs Temperature
1.0
0.9
PMOS R_DSON, V_IN = 2.7V
0.8
NMOS R_DSON, V_IN = 2.7V
0.7
0.6
0.5
0.4
0.3
NMOS R_DSON, V_IN = 5.5V
0.2
PMOS R_DSON, V_IN = 5.5V
0.1
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
36751 G24
Boost Regulator, Load Regulation
5.20 _{PWM MODE}
5.15
5.10
5.05
V_IN = 3.6V
V_IN = 4.2V
5.00
4.95
V_IN = 2.7V
4.90
4.85
4.80
1
10
100
LOAD CURRENT (mA)
1000
36751 G27
36751fc