Datasheet

3
LT3473/LT3473A
3473f
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3V, SHDN = 3V, CTRL = 2V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3473EDD and LT3473AEDE are guaranteed to meet
performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Load Regulation (Feedback Taken
from CAP)
LOAD CURRENT (mA)
0
19.00
VOLTAGE (V)
19.20
19.40
19.60
19.80
CAP
OUT
20.00
20.20
20 40 60 80
3473 G01
100
V
IN
= 3.6V
CTRL VOLTAGE (V)
0
0
FEEDBACK VOLTAGE (V)
0.2
0.6
0.8
1.0
1.4
0.2
1
1.4
3473 G02
0.4
1.2
0.8
1.8
2
0.4
0.6
1.2 1.6
CTRL VOLTAGE (V)
0
1.0
1.2
1.4
2
3473 G03
0.8
0.6
0.5 1 1.5
0.4
0.2
0
PGOOD THRESHOLD VOLTAGE (V)
Feedback Voltage PGOOD Threshold Voltage
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Frequency 0.9 1.2 1.4 MHz
Maximum Duty Cycle ● 88 92 %
Switch Current Limit ● 1.2 A
Switch V
CESAT
I
SW
= 100mA 45 mV
Switch Leakage Current V
SW
= 5V 0.1 5 µA
Schottky Forward Drop I
D
= 100mA 0.45 V
Schottky Leakage Current CAP = 36V, SW = 0V 4 µA
Disconnect PNP Voltage Drop I
OUT
= 100µA, CAP = 20V 80 mV
I
OUT
= 50mA, CAP = 20V 250 mV
Disconnect PNP Quiescent Current CAP = 20V 1.2 µA
Disconnect PNP Leakage Current SHDN = OUT = 0V, CAP = 20V 0.01 0.1 µA
LTC3473A Only
NPN1 Voltage Drop INE1 = 1mA 0.8 V
NPN1 Beta INE1 = 1mA 60
NPN2 Voltage Drop INE2 = 1mA 0.8 V
NPN2 Beta INE2 = 1mA 60
Note 3: Failure to correctly solder the Exposed Pad of the package to the
PC board will result in a thermal resistance much higher than 40°C.
T
A
= 25°C unless otherwise noted.