Datasheet

2
LT3463/LT3463A
3463f
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
V
IN
, SHDN1, SHDN2 Voltage ................................... 15V
SW1, SW2, V
OUT1
Voltage ....................................... 42V
D2 Voltage ............................................................. –42V
FB1, FB2 Voltage Range .............................. –0.3V to 2V
Junction Temperature........................................... 125°C
Operating Ambient Temperature Range
(Note 2) .............................................. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
ORDER PART
NUMBER
LT3463EDD
LT3463AEDD
DD PART MARKING
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.5V, V
SHDN
= 2.5V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage 2.2 2.4 V
Total Quiescent Current For Both Switchers, Not Switching 40 60 µA
Shutdown Current V
SHDN1
= V
SHDN2
= 0V 0.1 1 µA
V
REF
Pin Voltage With 124kΩ to GND ● 1.23 1.25 1.27 V
V
REF
Pin Voltage Line Regulation With 124kΩ to GND 0.05 0.10 %/V
FB1 Comparator Trip Voltage High to Low Transition ● 1.225 1.25 1.275 V
FB1 Comparator Hysteresis 8mV
FB1 Line Regulation 2.5V < V
IN
< 15V 0.05 0.10 %/V
FB1 Pin Bias Current (Note 3) V
FB1
= 1.3V ● 20 50 nA
FB2 Comparator Trip Voltage Low to High Transition ● 0312mV
FB2 Comparator Hysteresis 8mV
FB2 Line Regulation (V
REF
– V
FB2
) 2.5V < V
IN
< 15V 0.05 0.10 %/V
FB2 Pin Bias Current (Note 4) V
FB2
= –0.1V ● 20 50 nA
SW1 Switch Off Time V
OUT1
– V
IN
= 4V 300 ns
V
OUT1
– V
IN
= 0V 1.5 µs
SW2 Switch Off Time V
FB2
< 0.1V 300 ns
V
FB2
= 1V 1.5 µs
Switch V
CESAT
(SW1, SW2) I
SW
= 150mA 180 mV
Switch Current Limit (SW1) 180 250 320 mA
Switch Current Limit (SW2) LT3463 180 250 320 mA
LT3463A 320 400 460 mA
Swith Leakage Current (SW1, SW2) Switch Off, V
SW
= 42V 0.01 1 µA
Schottky Forward Voltage (V
OUT1
, D2) I
D
= 150mA 750 mV
Schottky Reverse Leakage Current V
OUT1
– V
SW
= 42V 1 5 µA
V
D2
= –42V 1 5 µA
SHDN1 Pin Current V
SHDN1
= 2.5V 4 10 µA
SHDN2 Pin Current V
SHDN2
= 2.5V 4 10 µA
SHDN1/SHDN2 Start-Up Threshold 0.3 1 1.5 V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3463/LT3463A are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND
AND MUST BE SOLDERED TO PCB
LAFC
LBJK
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
FB1
SHDN1
SHDN2
V
REF
FB2
V
OUT1
SW1
V
IN
SW2
D2
11
operating ambient temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 3: Bias current flows into the FB1 pin.
Note 4: Bias current flows out of the FB2 pin.