Datasheet
LT3681
2
3681f
ELECTRICAL CHARACTERISTICS
V
IN
, RUN/SS Voltage .................................................36V
BOOST Pin Voltage ...................................................56V
BOOST Pin Above SW Pin .........................................30V
FB, RT, V
C
Voltage .......................................................5V
BIAS, PG, BD Voltage ................................................30V
Maximum Junction Temperature .......................... 125°C
DC above DA .............................................................40V
Operating Temperature Range (Note 2)
LT3681E ............................................... –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3 3.6 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BIAS
= 3V, Not Switching
●
22 60 μA
V
BIAS
= 0, Not Switching 75 120 μA
Quiescent Current from BIAS V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BIAS
= 3V, Not Switching
●
50 120 μA
V
BIAS
= 0, Not Switching 05 μA
Minimum Bias Voltage 2.7 3 V
Feedback Voltage
●
1.25
1.24
1.265
1.265
1.29
1.3
V
V
FB Pin Bias Current (Note 3) V
FB
= 1.25V, V
C
= 0.4V
●
30 100 nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.002 0.02 %/V
Error Amp GM 330 μMho
Error Amp Gain 800
V
C
Source Current 65 μA
V
C
Sink Current 85 μA
V
C
Pin to Switch Current Gain 3.5 A/V
V
C
Clamp Voltage 2V
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 10V, V
RUNS/SS
= 10V, V
BOOST
= 15V, V
BIAS
= 3.3V unless otherwise
noted. (Note 2)
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
RUN/SS
V
IN
SW
BOOST
BD
DC
DA
PG
BIAS
FB
GND
V
C
R
T
GND
TOP VIEW
DE14MA PACKAGE
14-LEAD (4mm 3mm) PLASTIC DFN
15
16
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
EXPOSED PAD PIN 16 IS DC
ORDER PART NUMBER DE PART MARKING
LT3681EDE 3681
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/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.