LTC3499_15 Datasheet, PDF (4/16 Pages) Linear Technology – 750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

LTC3499/LTC3499B
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
2-Cell to 5V Efficiency
vs Load Current (LTC3499 Only)
100
Li-Ion to 5V Efficiency
vs Load Current (LTC3499 Only)
100000 100
100000
90
80
70
60
50
40
0.1
EFFICIENCY
10000
1000
100
POWER LOSS
10
V_IN = 3.2V ₁
V_IN = 2.4V
V_IN = 1.8V
0.1
1
10
100
1000
LOAD CURRENT (mA)
3499 G01
90
EFFICIENCY
80
10000
1000
70
POWER LOSS
100
60
10
50
40
30
0.1
V_IN = 4.2V ₁
V_IN = 3.6V
V_IN = 3V
0.1
1
10
100
1000
LOAD CURRENT (mA)
3499 G03
Current Limit Accuracy
vs Temperature
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3499 G04
2-Cell to 3.3V Efficiency
vs Load Current (LTC3499 Only)
100
100000
90
EFFICIENCY
80
10000
1000
70
100
60
50
40
0.1
10
POWER LOSS
V_IN = 3V ₁
V_IN = 2.4V
V_IN = 1.8V
0.1
1
10
100
1000
LOAD CURRENT (mA)
3499 G02
2-Cell to 5V Efficiency
vs Load Current (LTC3499B Only)
100
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 3.2V
V_IN = 2.4V
V_IN = 1.8V
1
10
100
LOAD CURRENT (mA)
1000
3499 G17
Burst Mode Output Current
Threshold vs Input Voltage
(LTC3499 Only)
60
V_OUT = 5V
50
40
30
20
10
0
1.8 2.3 2.8 3.3 3.8 4.3 4.8
INPUT VOLTAGE (V)
3499 G05
Maximum Output Current
Capability vs V_IN
800
700
V_IN > V_OUT
V_IN > V_OUT
600
V_OUT = 3.3V
500
400
300
V_OUT = 5V
200
100
0
1.5
2.5
3.5
4.5
5.5
V_IN (V)
3499 G06
No Load Input Current vs V_IN
(LTC3499 Only)
200
180
160
140
V_OUT = 3.3V
120
100
V_OUT = 5V
80
60
40
20
0
1.5
2.5
3.5
4.5
5.5
V_IN (V)
3499 G07
Burst Mode Quiescent Current
vs Temperature (LTC3499 Only)
30
25
20
15
10
5
0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3499 G08
3499fc
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