LT1949 LINER [Linear Technology], LT1949 Datasheet - Page 2

• Manufacturer Part Number: LT1949
• Description: 600kHz, 1A Switch PWM DC/DC Converter
• Manufacturer: LINER [Linear Technology]

PACKAGE/ORDER I FOR ATIO
ABSOLUTE AXI U RATI GS
LT1949
V
SW Voltage ............................................... – 0.4V to 30V
FB Voltage .................................................... V
V
LBI Voltage ............................................ 0V V
SHDN Voltage ........................................................... 6V
ELECTRICAL CHARACTERISTICS
Consult factory for Military grade parts.
temperature range, otherwise specifications are T
SYMBOL
I
V
I
g
A
f
2
Q
B
OSC
m
FB
V
IN
C
, LBO Voltage ..................................................... 12V
Voltage ................................................................ 2V
SHDN
GND
V
FB
T
C
JMAX
8-LEAD PLASTIC MSOP
1
2
3
4
PARAMETER
Quiescent Current
Feedback Voltage
FB Pin Bias Current (Note 3)
Input Voltage Range
Error Amp Transconductance
Error Amp Voltage Gain
Maximum Duty Cycle
Switch Current Limit (Note 4)
Switching Frequency
Shutdown Pin Current
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 5)
Low-Battery Detector Gain
Switch Leakage Current
= 125 C,
MS8 PACKAGE
TOP VIEW
JA
W
= 120 C/W
8
7
6
5
LBO
LBI
V
SW
IN
W W
U
MS8 PART MARKING
ORDER PART
LT1949EMS8
W
NUMBER
LTJC
A
U
= 25 C. V
IN
LBI
+ 0.3V
CONDITIONS
V
V
V
V
V
I
V
V
1M Pull-Up
V
SINK
SHDN
IN
IN
SHDN
SHDN
LBI
LBI
SW
I = 5 A
U
The
(Note 1)
IN
= 2.5V, Duty Cycle = 30%
= 2.5V, Duty Cycle = 30%
1V
= 250mV, V
= 150mV
= 5V
= 10 A
= 2V, V
= 0V
= V
= 0V
denotes specifications which apply over the full operating
IN
Junction Temperature .......................................... 125 C
Operating Temperature Range (Note 2)
Storage Temperature ........................... – 65 C to 150 C
Lead Temperature (Soldering, 10sec).................. 300 C
SHDN
SHDN
LBO
LT1949EMS8 .......................................–40 C to 85 C
LT1949ES8/LT1949IS8 .......................–40 C to 85 C
GND
V
FB
T
C
= 2V unless otherwise noted.
= 5V
JMAX
1
2
3
4
8-LEAD PLASTIC SO
= 125 C,
S8 PACKAGE
TOP VIEW
JA
= 120 C/W
8
7
6
5
LBO
LBI
V
SW
IN
MIN
1.22
1.20
0.95
500
180
190
1.7
70
80
1
S8 PART MARKING
0.015
2000
1.24
1.24
1.13
– 2.3
0.15
0.02
0.01
TYP
140
700
600
200
200
4.5
25
12
85
5
ORDER PART
LT1949ES8
LT1949IS8
NUMBER
1949E
1949I
MAX
1.26
1.26
0.25
240
750
210
220
7.5
1.5
1.5
0.1
0.1
40
80
12
– 7
60
3
UNITS
mhos
kHz
mA
V/V
mV
mV
V/V
nA
nA
%
A
V
V
V
A
A
A
A
V
A
A