Datasheet

LT3489
2
3489f
V
IN
Voltage ................................................................16V
SW Voltage ................................................ –0.4V to 40V
FB, V
C
, COMP, SS Voltages .........................................6V
SHDN Voltage ...........................................................16V
Current Into FB Pin ................................................±1mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(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
= 3V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3489E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the 40°C to 85°C operating
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.4 2.6 V
Maximum Operating Voltage 16 V
Feedback Voltage
1.22
1.21
1.235 1.26
1.26
V
V
FB Pin Bias Current V
FB
= 1.25V (Note 3)
100 250 nA
Error Amp Transconductance ΔI = 10μA 100 μmhos
Error Amp Voltage Gain 80 V/V
Quiescent Current V
SHDN
= 2.5V, Not Switching 2 4 mA
Quiescent Current in Shutdown V
SHDN
= 0V, V
IN
= 3V 0 1 μA
Reference Line Regulation 2.6V ≤ V
IN
≤ 16V 0.01 0.05 %
Switching Frequency
1.8 2 2.2 MHz
Maximum Switch Duty Cycle
85 90 %
Switch Current Limit (Note 4)
2.5 3.5 5 A
Switch V
CESAT
I
SW
= 2A 0.23 V
Switch Leakage Current V
SW
= 5V 0.01 1 μA
SHDN Pin Current V
SHDN
= 5V
V
SHDN
= 1.4V
V
SHDN
= 0V
100
20
2
μA
μA
μA
SHDN Pin Threshold 0.3 1.5 2 V
Soft-Start Charging Current V
SS
= 0.5V 5 10 20 μA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
1
2
3
4
V
C
FB
SHDN
GND
8
7
6
5
SS
COMP
V
IN
SW
TOP VIEW
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 40°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 9) IS GND (MUST BE SOLDERED TO PCB)
ORDER PART NUMBER MS8E PART MARKING
LT3489EMS8E LTBYF
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.
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current fl ows out of the FB pin.
Note 4: Current limit guaranteed by design and/or correlation to static test.
Current limit is independent of duty cycle and is guaranteed by design.