Datasheet

LTC3446
5
3446ff
Typical perForMance characTerisTics
Undervoltage Lockout Threshold
vs Temperature
Maximum Peak Inductor Current
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
2.00
V
IN
(V)
2.05
2.15
2.20
2.25
2.50
2.35
–10
30
50 130
3446 G04
2.10
2.40
2.45
2.30
–30 10
70
90
110
UVLO RISING
UVLO FALLING
TEMPERATURE (°C)
–50
CURRENT (A)
2.0
2.4
2.3
2.2
2.1
1.9
2.5
10 50 130
3446 G05
1.6
1.8
1.7
1.2
1.1
1.4
1.5
1.3
1.0
–30 –10
30
70 11090
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
TEMPERATURE (°C)
–50
2.00
OSCILLATOR FREQUENCY (MHz)
2.05
2.15
2.20
2.25
2.50
2.35
–10
30
50 130
3446 G06
2.10
2.40
2.45
2.30
–30 10
70
90
110
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
Peak Inductor Current
vs I
TH
Voltage
VLDO Current Limit
vs LV
IN
Voltage
VLDO Dropout Voltage
vs Load Current
I
TH
PIN VOLTAGE (V)
0
PEAK INDUCTOR CURRENT (A)
0.8
1.2
2
3446 G07
0.4
0
0.5
1
1.5
0.25
0.75
1.25
1.75
1.6
V
IN
= 3.6V
V
MODESEL
= 3.6V
0.6
1.0
0.2
1.4
LV
IN
PIN VOLTAGE (V)
0.00
0
VLDO CURRENT LIMIT (mA)
200
600
800
1000
4.00
1800
3446 G08
400
2.00
1.00
5.00
3.00 6.00
1200
1400
1600
V
IN
= 3.6V
LV
OUT
= 0V
PULSED MEASUREMENT,
T
J
≈ T
A
≈ 27°C
LOAD CURRENT (mA)
0
0
DROPOUT VOLTAGE (mV)
20
40
60
50
100
150 200
3446 G09
250
80
100
10
30
50
70
90
300
–45°C
27°C
90°C
130°C
V
IN
= 2.8V
LV
OUT
= 1.2V
V
IN
Bias Current
vs VLDO Load Current
LV
IN
No-Load Operating Current Enable/MODESEL Thresholds
VLDO OUTPUT CURRENT (mA)
0
0
V
IN
CURRENT (µA)
50
150
200
250
200
450
3446 G10
100
100
50
250
150 300
300
350
400
–45°C
27°C
90°C
130°C
V
IN
= 3.6V
LV
IN
= 1.5V
LV
OUT
= 1.2V
ONLY ONE VLDO
ENABLED
LV
IN
PIN VOLTAGE (V)
0
0
LV
IN
CURRENT (µA)
4
8
12
1
2
3 4
3446 G11
5
16
20
2
6
10
14
18
6
V
IN
= 5V
BOTH VLDOS ON AND
REGULATING 0.8V
–45°C
27°C
90°C
130°C
V
IN
(V)
2.5
0
ENABLE/MODESEL THRESHOLD (mV)
200
400
600
3
3.5
4 4.5
3446 G12
5
800
1000
100
300
500
700
900
5.5
–45°C
27°C
90°C
130°C