LT1946A Ver la hoja de datos (PDF) - Linear Technology
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LT1946A Datasheet PDF : 12 Pages
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LT1946A
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................................. 16V
SW Voltage ................................................– 0.4V to 36V
FB Voltage .............................................................. 2.5V
Current into FB Pin ............................................... ±1mA
SHDN Voltage .......................................................... 16V
Maximum Junction Temperature .......................... 125°C
Operating Temperature
Range (Note 2) ....................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VC 1
FB 2
SHDN 3
GND 4
8 SS
7 COMP
6 VIN
5 SW
MS8E PACKAGE
8-LEAD PLASTIC MSOP
EXPOSED PAD IS GROUND
(MUST BE SOLDERED TO PCB)
TJMAX = 125°C, θJA = 40°C/W,
θJC = 10°C/W
ORDER PART
NUMBER
LT1946AEMS8E
MS8E PART
MARKING
LTYZ
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 = 3V, VSHDN = VIN unless otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
CONDITIONS
FB Pin Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
VFB = 1.25V (Note 3)
∆I = 2µA
VSHDN = 2.5V, Not Switching
VSHDN = 0V, VIN = 3V
2.6V ≤ VIN ≤ 16V
Switching Frequency in Foldback
Maximum Duty Cycle
VFB = 0V
Switch Current Limit
(Note 4)
Switch VCESAT
Switch Leakage Current
Soft-Start Charging Current
SHDN Input Voltage High
ISW = 1A
VSW = 5V
VSS = 0.5V
SHDN Input Voltage Low
SHDN Pin Bias Current
VSHDN = 3V
VSHDN = 0V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1946AE is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
MIN TYP MAX UNITS
2.45 2.6
V
16
V
1.23 1.25 1.27
V
q 1.22
1.27
V
q
20
120
nA
40
µmhos
300
V/V
3.6
5
mA
0
1
µA
0.01 0.05
%/V
2.4
2.7
3
MHz
q 2.3
3.1
MHz
0.85
MHz
q 73
80
%
q 1.5
2.1
3.1
A
240 340
mV
0.01
1
µA
2.5
4
6
µA
2.4
V
0.5
V
16
32
µA
0
0.1
µA
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current flows out of the FB pin.
Note 4: Current limit guaranteed by design and/or correlation to static test.
Current limit is independent of duty cycle and is guaranteed by design.
sn1946a 1946afs
2
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