LTC3446 Datasheet, PDF (6/20 Pages) Linear Technology – Monolithic Buck Regulator with Dual VLDO Regulators

LTC3446
TYPICAL PERFORMANCE CHARACTERISTICS
Peak Inductor Current
vs I_TH Voltage
1.6
V_IN = 3.6V
1.4 ^VMODESEL ^{= 3.6V}
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
I_TH PIN VOLTAGE (V)
3446 G07
VLDO Dropout Voltage
vs Load Current
100
V_IN = 2.8V
90 LV_OUT = 1.2V
80
–45°C
27°C
70
90°C
130°C
60
50
40
30
20
10
0
0 50 100 150 200 250 300
LOAD CURRENT (mA)
3446 G09
LV_IN No-Load Operating Current
20
18
V_IN = 5V
BOTH VLDOS ON AND
16 ^{REGULATING 0.8V}
14
12
10
8
6
4
–45°C
27°C
2
90°C
130°C
0
0
1
2
3
4
5
6
LV_IN PIN VOLTAGE (V)
3446 G11
VLDO Current Limit
vs LV_IN Voltage
1800
V_IN = 3.6V
1600 LV_OUT = 0V
1400
1200
1000
800
PULSED MEASUREMENT,
600
T_J ≈ T_A ≈ 27°C
400
200
0
0.00
1.00 2.00 3.00 4.00 5.00 6.00
LV_IN PIN VOLTAGE (V)
3446 G08
V_IN Bias Current
vs VLDO Load Current
450
400
350
300
250
200
150
100
50
0
0
V_IN = 3.6V
LV_IN = 1.5V
LV_OUT = 1.2V
ONLY ONE VLDO
ENABLED
–45°C
27°C
90°C
130°C
50 100 150 200 250 300
VLDO OUTPUT CURRENT (mA)
3446 G10
Enable/MODESEL Thresholds
1000
900
800
700
600
500
400
300
200
–45°C
27°C
100
90°C
130°C
0
2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3446 G12
6
3446fd