Datasheet

2
LT1725
1725fa
(Note 1)
V
CC
Supply Voltage ................................................. 22V
UVLO Pin Voltage .................................................... V
CC
I
SENSE
Pin Voltage .................................................... 2V
FB Pin Current ..................................................... ±2mA
Operating Junction
Temperature Range
LT1725C .............................................. 0°C to 100°C
LT1725I ........................................... –40°C TO 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
PACKAGE/ORDER I FOR ATIO
UU
W
ABSOLUTE AXI U RATI GS
WWWU
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 14V, GATE open, V
C
= 1.4V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
V
CC
Turn-On Voltage ● 14.0 15.1 16.0 V
V
CC
Turn-Off Voltage ● 8 9.7 11 V
V
CC
Hysteresis (Note 3) (V
TURN-ON
– V
TURN-OFF
) ● 4.0 5.4 6.5 V
I
CC
Supply Current V
C
= Open ● 61015mA
Start-Up Current
● 120 280 µA
Feedback Amplifier
V
FB
Feedback Voltage 1.230 1.245 1.260 V
● 1.220 1.270 V
I
FB
Feedback Pin Input Current 500 nA
g
m
Feedback Amplifier Transconductance ∆l
C
= ±10µA ● 400 1000 1800 µmho
I
SRC
, I
SNK
Feedback Amplifier Source or Sink Current ● 30 50 80 µA
V
CL
Feedback Amplifier Clamp Voltage 2.5 V
Reference Voltage/Current Line Regulation 12V ≤ V
IN
≤ 18V ● 0.01 0.05 %/V
Voltage Gain V
C
= 1V to 2V 2000 V/V
Soft-Start Charging Current V
SFST
= 0V 25 40 50 µA
Soft-Start Discharge Current V
SFST
= 1.5V, V
UVLO
= 0V 0.8 1.5 mA
ORDER PART NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
LT1725CGN
LT1725IGN
LT1725CS
LT1725IS
T
JMAX
= 125°C, θ
JA
= 110°C/W (GN)
T
JMAX
= 125°C, θ
JA
= 100°C/W (SO)
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PGND
I
SENSE
SFST
R
OCMP
R
CMPC
OSCAP
V
C
FB
GATE
V
CC
t
ON
ENDLY
MINENAB
SGND
UVLO
3V
OUT
1725
1725I
GN PART MARKING