Datasheet

LM3481
www.ti.com SNVS346E –NOVEMBER 2007–REVISED APRIL 2012
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
pin Voltage -0.4V to 50V
FB Pin Voltage -0.4V to 6V
FA/SYNC/SD Pin Voltage -0.4V to 6V
COMP Pin Voltage -0.4V to 6V
UVLO Pin Voltage -0.4V to 6V
V
CC
Pin Voltage -0.4V to 6V
DR Pin Voltage -0.4V to 6V
I
SEN
Pin Voltage –0.4V to 600 mV
Peak Driver Output Current 1.0A
Power Dissipation Internally Limited
Storage Temperature Range −65°C to +150°C
Junction Temperature +150°C
ESD Susceptibility Human Body Model
(2)
2 kV
Lead Temperature
DGS Package
Vapor Phase (60 sec.)
215°C
Infared (15 sec.) 220°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicates conditions for which
the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test
conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions.
(2) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
RECOMMENDED OPERATING CONDITIONS
(1)
Supply Voltage 2.97V to 48V
Junction Temperature Range −40°C to +125°C
Switching Frequency Range 100 kHz to 1 MHz
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicates conditions for which
the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test
conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions.
ELECTRICAL CHARACTERISTICS
V
IN
=12V, R
FA
=40 kΩ unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type
apply for T
J
= 25°C. Limits appearing in boldfacetype apply over the full Operating Temperature Range (-40°C to 125°C).
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
(1) (2)
Symbol Parameter Conditions Min Typ Max Units
V
FB
Feedback Voltage V
COMP
= 1.4V, 2.97 ≤ V
IN
≤ 48V 1.256 1.275 1.294 V
ΔV
LINE
Feedback Voltage Line Regulation 2.97 ≤ V
IN
≤ 48V 0.003 %/V
ΔV
LOAD
Output Voltage Load Regulation I
EAO
Source/Sink ±0.5 %/A
Undervoltage Lockout Reference
V
UVLOSEN
V
UVLO
Ramping Down 1.345 1.430 1.517 V
Voltage
I
UVLO
UVLO Source Current Enabled 3 5 6 µA
V
UVLOSD
UVLO Shutdown Voltage 0.7 V
I
COMP
COMP pin Current Sink V
FB
= 0V 640 µA
V
COMP
V
FB
= 1.275V 1 V
f
nom
Nominal Switching Frequency R
FA
= 40 kΩ 406 475 550 kHz
Threshold for Synchronization on
V
sync-HI
Synchronization Voltage Rising 1.4 V
FA/SYNC/SD pin
Threshold for Synchronization on
V
sync-LOW
Synchronization Voltage Falling 0.7 V
FA/SYNC/SD pin
(1) All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room
temperature limits are 100% tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality
Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely norm.
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