Datasheet

LT3837
2
3837fd
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ................................................ –0.3V to 22V
UVLO, SYNC Pin Voltage
............................–0.3V to V
CC
SENSE
–
, SENSE
+
Pin Voltage ......................–0.5V, +0.5V
FB Pin Current
....................................................... ±2mA
V
C
Pin Current ....................................................... ± 1mA
Operating Junction Temperature Range
(Notes 2, 3, 4)
........................................ –40°C to 125°C
Storage Temperature Range
..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
(Note 1)
The l denotes specifications which apply over the full operating junction
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 14V; PG, SG Open; V
C
= 1.4V, V
SENSE
= 0, R
CMP
= 1k, R
TON
= 90k,
R
PGDLY
= 27.4k, R
ENDLY
= 90k, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Operating Range
l
4.5 20 V
V
CC
Supply Current (I
CC
) (Note 5) V
C
= Open
l
4 6.4 10 mA
V
CC
Shutdown Current V
C
= Open, V
UVLO
= OV
l
50 150 µA
Feedback Amplifier
Feedback Regulation Voltage (V
FB
)
l
1.220 1.237 1.251 V
Feedback Pin Input Bias Current R
CMP
Open 200 nA
Feedback Amplifier Transconductance ∆I
C
= ±10µA
l
700 1000 1400 µmho
Feedback Amplifier Source or Sink Current
l
25 55 90 µA
Feedback Amplifier Clamp Voltage V
FB
= 0.9
V
FB
= 1.4
2.56
0.84
V
V
Reference Voltage Line Regulation 12V ≤ V
IN
≤ 18V
l
0.005 0.05 %V
PIN CONFIGURATION
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
SG
V
CC
t
ON
ENDLY
SYNC
SFST
OSC
FB
PG
PGDLY
R
CMP
C
CMP
SENSE
+
SENSE
–
UVLO
V
C
17
T
JMAX
= 125°C, q
JA
= 40°C/W, q
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND,MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3837EFE#PBF LT3837EFE#TRPBF 3837EFE 16-Lead Plastic TSSOP –40°C to 125°C
LT3837IFE#PBF LT3837IFE#TRPBF 3837FE 16-Lead Plastic TSSOP –40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3837EFE LT3837EFE#TR 3837EFE 16-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/