LTC3586_15 Datasheet, PDF (10/36 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.)
Buck-Boost Regulator Burst Mode
Operation Quiescent Current
14.0
13.5
V_IN3 = 4.5V
13.0
V_IN1 = 3V
V_IN3 = 3.6V
12.5
12.0
11.5
11.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3586 G31
Boost Efficiency (V_IN4 = 3.8V)
100
0.7
V_OUT4 = 5V
90
0.6
80
70
EFFICIENCY
60
50
40
0.5
0.4
POWER LOSS
0.3
30
0.2
20
0.1
10
0
0
1
10
100
1000
I_VOUT4 (mA)
3586 G23
Maximum Deliverable Boost
Output Current
2200
2000
1800
L = 2.2µH
V_OUT4 = 4.9V (SET FOR 5V)
1600
1400
1200
1000
T = –45ºC
T = 90ºC
T = 25ºC
800
600
400
200
0
2.7 3 3.3 3.6 3.9 4.2 4.5
V_IN4 (V)
3586 G37
10
Reduction in Current
Deliverability at Low V_IN3
300
STEADY STATE ILOAD
START-UP WITH A
250
RESISTIVE LOAD
START-UP WITH A
CURRENT SOURCE LOAD
200
Buck-Boost Step Response
V_OUT3
100mV/DIV
AC
COUPLED
150
100
50
V_OUT3 = 3.3V
TYPE 3 COMPENSATION
0
2.7 3.1 3.5 3.9 4.3 4.7
V_IN3 (V)
3586 G32
300mA
I_VOUT3
200mA/DIV
0
V_IN3 = 3.8V
V_OUT3 = 3.3V
100µs/DIV
3586 G33
Boost Efficiency vs V_IN4
100
90
80
70
60
50
SYNCH
PMOS
40
OFF
30
20
10
0
2.6
I_VOUT4 = 300mA
V_OUT4 = 5V
3 3.4 3.8 4.2 4.6 5 5.4
INPUT VOLTAGE V_IN4 (V)
3586 G35
Boost Output Voltage
vs Temperature
5.000
4.995
4.990
4.985
V_IN4 = 2.7V
V_IN4 = 4.5V
4.980
4.975
V_IN4 = 3.8V
4.970
4.965
4.960
4.955
4.950
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (ºC)
3586 G36
Maximum Boost Duty Cycle
vs V_IN4
100
95
T = 90ºC
90
T = 25ºC
T = –45ºC
85
80
2.7 3 3.3 3.6 3.9 4.2 4.5
V_IN4 (V)
3586 G38
Boost Step Response
(50mA to 300mA)
V_OUT4
100mV/DIV
AC
COUPLED
V_IN3 = 3.8V
V_OUT3 = 3.3V
300mA
I_VOUT4
125mA/DIV
50mA
V_IN4 = 3.8V
V_OUT4 = 5V
L = 2.2µH
C = 10µF
50µs/DIV
3586 G39
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