LT3463A Ver la hoja de datos (PDF) - Linear Technology
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LT3463A Datasheet PDF : 8 Pages
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LT3463/LT3463A
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, SHDN1, SHDN2 Voltage ................................... 15V
SW1, SW2, VOUT1 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VOUT1 1
SW1 2
VIN 3
SW2 4
D2 5
10 FB1
9 SHDN1
11
8 SHDN2
7 VREF
6 FB2
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
EXPOSED PAD (PIN 11) IS GND
AND MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LT3463EDD
LT3463AEDD
DD PART MARKING
LAFC
LBJK
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Input Voltage
2.2
2.4
Total Quiescent Current
For Both Switchers, Not Switching
40
60
Shutdown Current
VSHDN1 = VSHDN2 = 0V
0.1
1
VREF Pin Voltage
VREF Pin Voltage Line Regulation
FB1 Comparator Trip Voltage
With 124kΩ to GND
With 124kΩ to GND
High to Low Transition
q 1.23 1.25 1.27
0.05 0.10
q 1.225 1.25 1.275
FB1 Comparator Hysteresis
8
FB1 Line Regulation
FB1 Pin Bias Current (Note 3)
FB2 Comparator Trip Voltage
2.5V < VIN < 15V
VFB1 = 1.3V
Low to High Transition
q
q0
0.05 0.10
20
50
3
12
FB2 Comparator Hysteresis
8
FB2 Line Regulation (VREF – VFB2)
FB2 Pin Bias Current (Note 4)
SW1 Switch Off Time
SW2 Switch Off Time
Switch VCESAT (SW1, SW2)
Switch Current Limit (SW1)
2.5V < VIN < 15V
VFB2 = –0.1V
VOUT1 – VIN = 4V
VOUT1 – VIN = 0V
VFB2 < 0.1V
VFB2 = 1V
ISW = 150mA
0.05 0.10
q
20
50
300
1.5
300
1.5
180
180
250
320
Switch Current Limit (SW2)
LT3463
LT3463A
180
250
320
320
400
460
Swith Leakage Current (SW1, SW2)
Schottky Forward Voltage (VOUT1, D2)
Schottky Reverse Leakage Current
SHDN1 Pin Current
SHDN2 Pin Current
SHDN1/SHDN2 Start-Up Threshold
Switch Off, VSW = 42V
ID = 150mA
VOUT1 – VSW = 42V
VD2 = –42V
VSHDN1 = 2.5V
VSHDN2 = 2.5V
0.01
1
750
1
5
1
5
4
10
4
10
0.3
1
1.5
UNITS
V
µA
µA
V
%/V
V
mV
%/V
nA
mV
mV
%/V
nA
ns
µs
ns
µs
mV
mA
mA
mA
µA
mV
µA
µA
µA
µA
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
operating ambient temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 2: The LT3463/LT3463A are guaranteed to meet performance
Note 3: Bias current flows into the FB1 pin.
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
Note 4: Bias current flows out of the FB2 pin.
3463f
2
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