LT1946 LINER [Linear Technology], LT1946 Datasheet - Page 2

• Manufacturer Part Number: LT1946
• Description: 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
• Manufacturer: LINER [Linear Technology]

ABSOLUTE AXI U RATI GS
LT1946
(Note 1)
V
SW Voltage ............................................... – 0.4V to 36V
FB Voltage ............................................................. 2.5V
SHDN Voltage ......................................................... 16V
Current Into FB Pin .............................................. 1mA
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
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1946E is 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.
2
temperature range, otherwise specifications are at T
SYMBOL
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
FB Pin Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
Switching Frequency in Foldback
Maximum Duty Cycle
Switch Current Limit
Switch V
Switch Leakage Current
Soft-Start Charging Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
IN
Voltage ............................................................. 16V
CESAT
W
W W
CONDITIONS
V
V
V
2.6V V
V
(Note 4)
I
V
V
V
V
SW
FB
SHDN
SHDN
FB
SW
SS
SHDN
SHDN
I = 2 A
= 1A
= 1.250V (Note 3)
= 0V
= 0.5V
= 5V
= 0V, V
= 2.5V, Not Switching
= 3V
= 0V
IN
16V
IN
U
= 3V
A
= 25 C. V
The
IN
denotes the specifications which apply over the full operating
= 3V, V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 3: Current flows out of 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.
SHDN
SHDN
GND
V
FB
T
C
JMAX
8-LEAD PLASTIC MSOP
= V
1
2
3
4
(4-LAYER BOARD)
= 125 C,
MS8 PACKAGE
IN
TOP VIEW
unless otherwise specified. (Note 2)
JA
= 125 C/W
8
7
6
5
SS
COMP
V
SW
IN
1.230
1.220
MIN
0.9
0.8
1.5
2.5
2.4
86
U
MS8 PART MARKING
1.250
LT1946EMS8
2.45
0.01
0.01
ORDER PART
TYP
300
240
3.2
1.2
0.4
2.1
20
40
90
16
0
4
0
NUMBER
LTUG
W
1.270
1.270
MAX
0.05
120
340
2.6
1.4
1.5
3.1
0.5
0.1
16
32
5
1
1
6
sn1946 1946fs
UNITS
U
mhos
MHz
MHz
MHz
%/V
V/V
mV
mA
nA
%
V
V
V
V
A
A
A
A
V
V
A
A