LTC3446
Typical perForMance characTerisTics
Undervoltage Lockout Threshold
vs Temperature
Oscillator Frequency
vs Temperature
Maximum Peak Inductor Current
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
UVLO RISING
UVLO FALLING
V
V
V
V
= 2.7V
= 3.6V
= 4.2V
= 5.5V
V
V
V
V
= 2.7V
= 3.6V
= 4.2V
= 5.5V
IN
IN
IN
IN
IN
IN
IN
IN
30
TEMPERATURE (°C)
90
110 130
–50 –30 –10 10
50 70 90 110 130
–50 –30 –10 10
50
30
70
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
TEMPERATURE (°C)
3446 G05
3446 G06
3446 G04
Peak Inductor Current
vs ITH Voltage
VLDO Current Limit
vs LVIN Voltage
VLDO Dropout Voltage
vs Load Current
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1800
100
90
80
70
60
50
40
30
20
10
0
V = 2.8V
IN
V
V
= 3.6V
IN
MODESEL
V
= 3.6V
= 0V
IN
OUT
LV
= 1.2V
–45°C
27°C
90°C
130°C
= 3.6V
1600 LV
1400
1200
1000
800
OUT
PULSED MEASUREMENT,
T ≈ T ≈ 27°C
J
A
600
400
200
0
1
1.25
1.5 1.75
0
0.25 0.5 0.75
2
0
50
150
200
250
300
100
0.00 1.00 2.00 3.00 4.00 5.00
6.00
I
PIN VOLTAGE (V)
LOAD CURRENT (mA)
LV PIN VOLTAGE (V)
IN
TH
3446 G07
3446 G09
3446 G08
VIN Bias Current
vs VLDO Load Current
LVIN No-Load Operating Current
Enable/MODESEL Thresholds
450
20
18
16
14
12
10
8
1000
900
800
700
600
500
400
300
200
100
0
V
= 5V
IN
400
350
300
250
200
150
100
50
BOTH VLDOS ON AND
REGULATING 0.8V
V
= 3.6V
IN
LV = 1.5V
IN
OUT
LV
= 1.2V
ONLY ONE VLDO
ENABLED
–45°C
6
–45°C
–45°C
4
27°C
90°C
130°C
27°C
90°C
130°C
27°C
90°C
2
130°C
0
0
0
1
3
4
5
6
2
2.5
3
4
4.5
5
5.5
3.5
0
50
100
150
300
200
250
LV PIN VOLTAGE (V)
IN
V
(V)
VLDO OUTPUT CURRENT (mA)
IN
3446 G11
3446 G12
3446 G10
3446ff
5