LTC3586-1_15 Datasheet, PDF (9/36 Pages) Linear Technology – High Efficiency USB Power Manager with Boost, Buck-Boost and Dual Bucks

LTC3586/LTC3586-1
Typical Performance Characteristics (T_A = 25°C unless otherwise noted)
Switching Regulators 1, 2 Pulse-
Skip Mode Quiescent Currents
325
1.95
V_IN1,2 = 3.8V
300
1.90
V_{OUT1, 2} = 2.5V
(CONSTANT FREQUENCY)
275
1.85
250
1.80
225
200
– 40
1.75
V_OUT1,2 = 1.25V
(PULSE SKIPPING)
1.70
–15
10
35
60
85
TEMPERATURE (°C)
3586 G22
Switching Regulators 1, 2 Load
Regulation at V_{OUT1, 2} = 1.2V
1.230
V_BUS = 3.8V
1.215
Burst Mode
OPERATION
1.200
1.185
PULSE-SKIP
MODE
Switching Regulators 1, 2
Pulse-Skip Mode Efficiency
100
90 _{VOUT1, 2 = 2.5V}
80
70
V_{OUT1, 2} = 1.2V
60
V_{OUT1, 2} = 1.8V
50
40
30
20
10
0
V_{IN1, 2} = 3.8V
1
10
100
1000
OUTPUT CURRENT (mA)
3586 G23
Switching Regulators 1, 2 Load
Regulation at V_{OUT1, 2} = 1.8V
1.845
V_BUS = 3.8V
Burst Mode OPERATION
1.823
PULSE-SKIP MODE
1.800
1.778
Switching Regulators 1, 2
Burst Mode Efficiency
100
V_{OUT1, 2} = 2.5V
90
80
V_{OUT1, 2} = 1.2V
70
V_{OUT1, 2} = 1.8V
60
50
40
30
20
10
0
0.1
V_{IN1, 2} = 3.8V
1
10
100
OUTPUT CURRENT (mA)
1000
3586 G24
Switching Regulators 1, 2 Load
Regulation at V_{OUT1, 2} = 2.5V
2.56
V_BUS = 3.8V
2.53 ^{Burst Mode OPERATION}
PULSE-SKIP MODE
2.50
2.47
1.170
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3586 G25
1.755
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3586 G26
2.44
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3586 G27
Buck-Boost Regulator Efficiency
vs I_LOAD
100
90
80
Burst Mode
OPERATION
70
CURVES
60
V_IN3 = 3V
V_IN3 = 3.6V
50
V_IN3 = 4.5V
40
PWM MODE
CURVES
V_IN3 = 3V
V_IN3 = 3.6V
V_IN3 = 4.5V
30
20
10
0
0.1
V_OUT3 = 3.3V
TYPE 3 COMPENSATION
1
10
100
1000
I_LOAD (mA)
3586 G28
R_DS(ON) For Buck-Boost Regulator
0.30
0.40
PMOS V_IN3 = 3V
0.25
PMOS V_IN3 = 3.6V
PMOS V_IN3 = 4.5V
0.35
0.20
0.30
NMOS V_IN3 = 3V
0.15
NMOS V_IN3 = 3.6V
0.25
NMOS V_IN3 = 4.5V
0.10
0.20
0.05
0.15
0
0.10
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3586 G29
Buck-Boost Regulator Forward
Current Limit
2600
V_IN3 = 3V
2550
2500
V_IN3 = 3.6V
V_IN3 = 4.5V
2450
2400
2350
2300
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3586 G30
3586fb