Datasheet

LT3487
2
3487f
V
IN
Voltage ............................................................... 16V
V
BAT
Voltage ............................................................. 16V
SWP, SWN Voltage ................................................... 32V
CAP, V
POS
.................................................................30V
DN Voltage ............................................................. –32V
RUN/SS Voltage ..........................................................8V
FBP Voltage ................................................................ 6V
FBN Voltage ................................................ –0.2V to 6V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range ................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
ORDER PART NUMBER
DD PART MARKING
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LBXB
LT3487EDD
(Note 1)
The
● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, V
BAT
= 3.6V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range 2.3 16 V
Quiescent Current RUN/SS = 3V, Not Switching
RUN/SS = 0V
3.7
5.3
5
8
mA
µA
RUN/SS Voltage Threshold (Full Current) (Note 3) 1.6 V
RUN/SS Voltage Threshold (Shutdown)
●
100 160 mV
RUN/SS Pin Current RUN/SS = 0V (Note 4) 1 1.4 2 µA
FBP (Positive Channel) Pin Voltage
●
1.19 1.23 1.27 V
FBN (Negative Channel) Pin Voltage
●
–7 3 12 mV
FBP Pin Voltage Line Regulation 0.007 %/V
FBN Pin Voltage Line Regulation 0.001 mV/V
FBP Pin Bias Current
●
24.4 25 25.6 µA
FBN Pin Bias Current
●
24.4 25 25.6 µA
FBP Threshold (Percent of Final Value)
to Start Negative Channel
87 90 %
Switching Frequency 1.85 2 2.15 MHz
Maximum Duty Cycle
●
87 93 %
Positive Channel Switch Current Limit (Note 5)
●
750 920 mA
Negative Channel Switch Current Limit (Note 5)
●
900 1090 mA
Positive Channel V
CESAT
I
SWP
= 400mA 280 mV
Negative Channel V
CESAT
I
SWN
= 600mA 340 mV
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V
POS
FBP
RUN/SS
FBN
V
IN
CAP
SWP
V
BAT
SWN
DN
θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE CONNECTED TO PCB
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/