LTC3252 Datasheet, PDF (3/12 Pages) Linear Technology – Dual, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3252
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3252EDE is guaranteed to meet specified performance
from 0°C to 70°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design characterization and correlation
with statistical process control.
Note 3: Based on long-term current density limitations.
Note 4: Minimum operating voltage required for regulation is:
V_IN > 2 • (V_OUT(MIN) + R_OL • I_OUT)
Note 5: Output not in regulation; R_OL = (V_IN/2 – V_OUT)/I_OUT.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS
No Load Supply Current vs Supply
Voltage (One Output Enabled)
60
50
25°C
40
85°C
30
–45°C
20
10
0
2.7 3.2 3.7 4.2 4.7 5.2
V_IN (V)
3252 G01
EN1/EN2 Input Threshold Voltage
vs Supply Voltage
1.2
1.1
1.0
25°C
0.9
–40°C
0.8
0.7
85°C
0.6
0.5
0.4
2.7 3.2 3.7 4.2 4.7 5.2
V_IN (V)
3252 G04
No Load Supply Current vs Supply
Voltage (Both Outputs Enabled)
100
90
80
25°C
70
85°C
60
50
–40°C
40
30
20
10
0
2.7 3.2 3.7 4.2 4.7 5.2
V_IN (V)
3252 G02
1.5V Output Voltage vs Supply
Voltage
1.60
1.58 ^{TA = 25°C}
1.56
1.54
I_OUT = 50mA
1.52
I_OUT = 0mA
1.50
1.48
1.46
I_OUT = 250mA
1.44
1.42
1.40
3
3.5
4
4.5
5
5.5
V_IN (V)
3252 G05
FB Voltage vs Load Current
0.82
V_IN = 3.6V
0.81
0.80
25°C
0.79
–40°C
0.78
85°C
0.77
0.76
0
50 100 150 200 250
I_OUT (mA)
3252 G03
1.5V Output Efficiency vs Output
Current
100
T_A = 25°C
80
60
40
20
0
0.1
V_IN = 3.1V
V_IN = 3.3V
V_IN = 3.6V
V_IN = 4V
V_IN = 5V
1
10
100
I_OUT (mA)
1000
3252 G06
3252f
3