LTC3447_15 Datasheet, PDF (4/16 Pages) Linear Technology – I2C Controllable Buck Regulator

LTC3447
TYPICAL PERFOR A CE CHARACTERISTICS
DAC Nonlinearity
0.5
0.4
0.3
0.2
INL
0.1
0
– 0.1
DNL
– 0.2
– 0.3
– 0.4
– 0.5
0
10 20 30 40 50 60
DAC
3447 G04
Efficiency and Power Loss vs
Load Current (V_IN = 5.5V)
100
1000
90
V_OUTMAX
80
70
100
60
V_OUTMIN
50
40
30
LOSS_MAX
10
20
LOSS_MIN
10
0
1
1
10
100
1000
LOAD CURRENT (mA)
3447 GO1
EffIciency and Power Loss vs
Load Current (V_IN = 3.6V)
100
90
V_OUTMAX
80
V_OUTMIN
70
60
50
LOSS_MAX
40
30
LOSS_MIN
20
10
0
1
10
100
LOAD CURRENT (mA)
1000
100
10
1
1000
3447 G02
EffIciency and Power Loss vs
Load Current (V_IN = 2.5V)
100
1000
90
V_OUTMAX
80
70
V_OUTMIN
100
60
50
LOSS_MAX
40
10
30
LOSS_MIN
20
10
0
1
1
10
100
1000
LOAD CURRENT (mA)
3447 G03
Output Voltage vs Load Current
2.10
0.80
2.05 _{DAC = MAX}
V_IN = 3.6V
0.75
V_IN = 2.5V
2.00 _{DAC = MIN}
V_IN = 3.6V
0.70
V_IN = 2.5V
1.95
0.65
1.90
0
200 400 600 800
LOAD CURRENT (mA)
0.60
1000
3447 G05
Bias Current vs Supply Voltage
350
300
250 ^{PULSE SKIP}
200
150
100
50
BURST
0
2.5
3.5
4.5
SUPPLY VOLTAGE (V)
5.5
3447 G06
Frequency vs Supply Voltage
1.12
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
3447 G07
Frequency vs Temperature
1.30
1.24
1.18
1.12
1.06
1.00
0.94
0.88
0.82
0.76
0.70
–40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3447 G08
Bias Current and Shutdown
Current vs Temperature
3.0
BIAS CURRENT
360
V_IN = 5.5V
2.5
V_IN = 3.6V
310
V_IN = 2.5V ^2.0
1.5
260
SHUTDOWN CURRENT
V_IN = 5.5V
1.0
210
V_IN = 3.6V
0.5
160
–40 –20 0
V_IN = 2.5V
0
20 40 60 80 100 120
TEMPERATURE (°C)
3447 G09
3447f
4