Datasheet

LT3973/LT3973-3.3/LT3973-5
3
3973fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BD
= 3.3V unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Note 3)
l
3.8 4.2 V
Quiescent Current from V
IN
V
EN/UVLO
Low
V
EN/UVLO
High
V
EN/UVLO
High, –40°C to 125°C
V
EN/UVLO
High, –40°C to 150°C
l
l
0.75
1.8
1.3
2.8
6
12
µA
µA
µA
µA
LT3973 Feedback Voltage
l
1.195
1.185
1.21
1.21
1.225
1.235
V
V
LT3973-3.3 Output Voltage
l
3.26
3.234
3.3
3.3
3.34
3.366
V
V
LT3973-5 Output Voltage
l
4.94
4.9
5
5
5.06
5.1
V
V
LT3973 FB Pin Bias Current (Note 3) V
FB
= 1.21V
l
0.1 20 nA
FB/Output Voltage Line Regulation 4.2V < V
IN
< 40V 0.0002 0.01 %/V
FB Pin Bias Current
l
0.1 20 nA
FB Voltage Line Regulation 4.2V < V
IN
< 40V 0.0002 0.01 %/V
Switching Frequency R
T
= 41.2k, V
IN
= 6V
R
T
= 158k, V
IN
= 6V
R
T
= 768k, V
IN
= 6V
1.72
632
156
2.15
790
195
2.58
948
234
MHz
kHz
kHz
Switch Current Limit V
IN
= 5V, V
FB
= 0V
l
1.237 1.65 1.98 A
Catch Schottky Current Limit V
IN
= 5V
l
0.92 1.15 1.44 A
Switch V
CESAT
I
SW
= 500mA 250 mV
Switch Leakage Current 0.05 2 µA
Catch Schottky Forward Voltage I
SCH
= 200mA, V
IN
= V
BD
= NC 550 mV
Catch Schottky Reverse Leakage V
SW
= 12V 0.05 2 µA
Boost Schottky Forward Voltage I
SCH
= 50mA, V
IN
= NC, V
BOOST
= 0V 820 mV
Boost Schottky Reverse Leakage V
REVERSE
= 12V 0.02 2 µA
Minimum Boost Voltage (Note 4) V
IN
= 5V
l
1.4 1.8 V
BOOST Pin Current I
SW
= 500mA, V
BOOST
= 15V 10 13 mA
Dropout Comparator Threshold (V
IN
- OUT) Falling, V
IN
= 5V
l
400 490 580 mV
Dropout Comparator Hysteresis 40 mV
EN/UVLO Pin Current V
EN/UVLO
= 12V 1 30 nA
EN/UVLO Voltage Threshold EN/UVLO Falling, V
IN
≥ 4.2V
l
1.09 1.16 1.23 V
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3973EDD-5#PBF LT3973EDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973IDD-5#PBF LT3973IDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3973HDD-5#PBF LT3973HDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
orDer inFormaTion