Datasheet

LT3825
2
3525fe
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
CC
to GND
Low Impedance Source ........................ –0.3V to 18V
Current Fed
(V
CC
Has Internal 19.5V Clamp) ...........30mA Into V
CC
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)
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 14V; PG, SG Open; V
C
= 1.5V, V
SENSE
–
= 0V; R
CMP
= 1k,
R
tON
= 90k, R
PGDLY
= 27.4k, R
ENDLY
= 90k, unless otherwise specified (Note 3).
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
GND
T
JMAX
= 125°C, θ
JA
= 40°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Turn-On Voltage
l
14.0 15.3 16.0 V
V
CC
Turn-Off Voltage
l
8 9.7 11 V
V
CC
Hysteresis V
CC(ON)
– V
CC(OFF)
l
4.0 5.6 6.5 V
V
CC
Shunt Clamp V
UVLO
= 0V, I
VCC
= 15mA
l
19.5 20.5 V
V
CC
Supply Current (Note 5) (I
CC
) V
C
= Open
l
4 6.4 10 mA
V
CC
Start-Up Current V
CC
= 10V
l
180 400 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
= 0.9V
V
FB
= 1.4V
2.56 V
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3825EFE#PBF LT3825EFE#TRPBF 3825EFE 16-Lead Plastic 4.4mm TSSOP –40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3825EFE LT3825EFE#TR 3825EFE 16-Lead Plastic 4.4mm TSSOP –40°C to 125°C
Consult LT C 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/