LTC3670_15 Datasheet, PDF (4/12 Pages) Linear Technology – Monolithic 400mA Buck Regulator with Dual 150mA

LTC3670
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
V_IN Supply Current vs V_IN
120
ALL THREE OUTPUTS ENABLED,
NO LOAD
100
130°C
80 ^90°C
25°C
60
–45°C
40
20
0
2.5 3 3.5 4 4.5
V_IN (V)
5 5.5
3670 G01
Buck Load Regulation
820
V_IN = 3.6V
815
810
805
800
795
790
785
780
0
50 100 150 200 250 300 350 400
LOAD CURRENT (mA)
3670 G04
LDO Dropout vs Load Current
at V_IN = 3.6V
300 _{VIN = 3.6V}
250
200
130°C
150
90°C
100
– 45°C
50
0
0
25°C
25 50 75 100 125 150
LOAD CURRENT (mA)
3670 G07
4
Buck Regulated Feedback Voltage
vs Temperature
820
UNITY GAIN, V_(OUT) = V_(BUCKFB)
815 ^I(OUT) ^{= 100mA}
810
805 VIN = 5.5V
800
795
V_IN = 3.6V
790
V_IN = 4.2V
V_IN = 2.5V
785
780
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (˚C)
3670 G02
LDO Load Regulation
820
V_IN = 3.6V
815
810
805
800
795
790
785
780
0
25 50 75 100 125 150
LOAD CURRENT (mA)
3670 G05
LDO Short-Circuit Current vs V_IN
500
450
400
350
300
250
200
150
100
50
0
2.5 3 3.5 4 4.5
V_IN (V)
– 45°C
25°C
90°C
5 5.5
3670 G08
Regulated LDO Feedback Pin
Voltage vs Temperature
820
UNITY GAIN, V_(OUT) = V_{(LDO_FB)}
815 ^I(OUT) ^{= 0.1mA}
810
805
800
795
790
V_IN = 2.5V
V_IN = 3.6V
785
V_IN = 4.2V
V_IN = 5.5V
780
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (˚C)
3670 G03
LDO Dropout vs Load Current
at V_IN = 2.5V
300 _{VIN = 2.5V}
250
130°C
200
90°C
150
– 45°C
100
25°C
50
0
0 25 50 75 100 125 150
LOAD CURRENT (mA)
3670 G06
Buck Oscillator Frequency
vs Temperature
2.35
V_IN = 5.5V
2.30
V_IN = 4.2V
2.25
V_IN = 3.6V
2.20
2.15
V_IN = 2.5V
2.10
2.05
2.00
1.95
1.90
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (˚C)
3670 G09
3670f