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LTC4081 Scheda tecnica(PDF) 6 Page - Linear Technology

Il numero della parte LTC4081
Spiegazioni elettronici  500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck
PDF  24 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC4081 Scheda tecnica(HTML) 6 Page - Linear Technology

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LTC4081
6
4081f
20
25
35
15
10
5
0
30
4081 G16
BATTERY VOLTAGE (V)
2.5
4.5
3.0
3.5
4.0
IOUT = 1mA
VOUT = 1.8V
L = 10
μH
TEMPERATURE (
°C)
0.80
0.90
1.05
0.85
1.00
0.95
4081 G10
–50
30
–10
–30
50
70
10
90
BATTERY VOLTAGE (V)
2.5
2.26
2.27
2.28
4.0
4081 G11
2.25
2.24
3.0
3.5
4.5
2.23
2.22
TEMPERATURE (
°C)
–60
1.8
1.9
2.0
2.1
2.2
–20
20
60
100
2.3
2.4
–40
0
40
80
4081 G12
VBAT = 2.7V
VBAT = 4.5V
VBAT = 3.8V
LOAD CURRENT (mA)
0.01
40
60
80
0.1
10
100
1
1000
20
0
100
1
10
100
0.1
0.01
1000
4081 G13
VBAT = 3.8V
VOUT = 1.8V
L = 10
μH
C = 4.7
μF
EFFICIENCY
(BURST)
POWER LOSS
(BURST)
EFFICIENCY
(PWM)
POWER
LOSS
(PWM)
BATTERY VOLTAGE (V)
2.5
1.780
1.785
1.790
1.795
1.800
1.805
1.810
3.0
3.5
4.0
4.5
4081 G14
PWM MODE
IOUT = 1mA
VOUT SET FOR 1.8V
Burst Mode
OPERATION
TEMPERATURE (˚C)
–50
1.800
1.805
1.810
10
50
1.795
1.790
–30
–10
30
70
90
1.785
1.780
4081 G15
PWM MODE
Burst Mode
OPERATION
IOUT = 1mA
VOUT SET FOR 1.8V
No-Load Buck Input Current
(Burst Mode Operation)
vs Battery Voltage
Normalized Charge Termination
Time vs Temperature
Buck Oscillator Frequency
vs Battery Voltage
Buck Oscillator Frequency
vs Temperature
Buck Efficiency vs Load Current
(VOUT = 1.8V)
Buck Output Voltage
vs Battery Voltage
Buck Output Voltage
vs Temperature
70
40
20
10
0
80
60
50
30
4081 G09
ICHRG = 5mA
TEMPERATURE (
°C)
–50
30
–10
–30
50
70
10
90
⎯C⎯H⎯R⎯G Pin Output
Low Voltage vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS (T
A = 25°C, VCC = 5V, VBAT = 3.8V, unless otherwise
specified)
Buck Efficiency vs Load Current
(VOUT = 1.5V)
LOAD CURRENT (mA)
0.01
40
60
80
0.1
10
100
1
1000
20
0
100
1
10
100
0.1
0.01
1000
4081 G13a
VBAT = 3.8V
VOUT = 1.5V
L = 10
μH
C = 4.7
μF
EFFICIENCY
(PWM)
POWER
LOSS
(PWM)
EFFICIENCY
(BURST)
POWER LOSS
(BURST)



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