LT1949-1EMS8#TR Linear Technology, LT1949-1EMS8#TR Datasheet - Page 2

• Manufacturer Part Number: LT1949-1EMS8#TR
• Description: IC CONV DC/DC PWM STEP UP 8MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1949-1EMS8#TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 28V
• Current - Output: 1A
• Frequency - Switching: 1.1MHz
• Voltage - Input: 1.7 ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

ABSOLUTE AXI U RATI GS
LT1949-1
(Note 1)
V
SW Voltage ............................................... – 0.4V to 30V
FB Voltage .................................................... V
V
LBI Voltage ............................................ 0V V
SHDN Voltage ........................................................... 6V
Junction Temperature .......................................... 125 C
Operating Temperature Range (Note 2) ...–40 C to 85 C
Storage Temperature ........................... – 65 C to 150 C
Lead Temperature (Soldering, 10sec).................. 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 LT1949-1E 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.
temperature range, otherwise specifications are at T
SYMBOL
I
V
I
g
A
f
2
Q
B
OSC
m
FB
V
IN
C
, LBO Voltage ..................................................... 12V
Voltage ................................................................ 2V
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
Switch V
Reference Line Regulation
SHDN Input Voltage High
SHDN Input Voltage Low
CESAT
W
W W
U
A
= 25 C. V
IN
LBI
+ 0.3V
CONDITIONS
V
V
V
V
I
V
V
1M Pull-Up
V
I
I
1.8V V
SINK
SW
SW
The
SHDN
IN
SHDN
SHDN
LBI
LBI
SW
I = 5 A
= 2.5V, Duty Cycle = 30%
= 800mA
= 500mA
1V
= 250mV, V
= 150mV
= 5V
= 10 A
IN
= 0V
= V
= 0V
denotes the specifications which apply over the full operating
IN
= 2V, V
IN
PACKAGE/ORDER I FOR ATIO
12V
Consult factory for Industrial and Military grade parts.
Note 3: Bias current flows into FB pin.
Note 4: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator.
Note 5: Bias current flows out of LBI pin.
LBO
SHDN
SHDN
GND
= 5V
V
FB
T
C
JMAX
8-LEAD PLASTIC MSOP
= 2V unless otherwise noted.
1
2
3
4
= 125 C,
MS8 PACKAGE
TOP VIEW
JA
= 120 C/W
8
7
6
5
LBO
LBI
V
SW
IN
MIN
1.22
1.20
0.85
140
180
190
1.7
1.4
80
1
U
MS8 PART MARKING
0.015
2000
1.24
1.24
0.15
0.01
0.08
TYP
280
700
200
200
410
270
1.1
1.1
50
24
85
– 5
20
30
LT1949-1EMS8
8
ORDER PART
NUMBER
W
LTQX
MAX
1.26
1.26
1.35
0.25
– 14
150
480
210
220
100
120
400
1.5
0.1
0.4
14
80
12
3
6
UNITS
U
mhos
MHz
%/V
mA
V/V
mV
mV
V/V
mV
mV
nA
nA
nA
%
A
V
V
V
A
A
A
V
A
V
V