Datasheet

TPS40055-EP
www.ti.com SGLS310D –JULY 2005–REVISED FEBRUARY 2012
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
(1)
VALUE / UNIT
VIN 45 V
VFB, SS, SYNC –0.3 V to 6 V
V
IN
Input voltage range SW –0.3 V to 45 V
SW, transient < 50 ns –2.5 V
KFF, with I
IN(max)
= –5 mA –0.3 V to 11 V
V
OUT
Output voltage range COMP, RT, SS –0.3 V to 6 V
I
IN
Input current KFF 5 mA
I
OUT
Output current RT 200 µA
T
J
Operating junction temperature range –55°C to 140°C
T
stg
Storage temperature
(2)
–55°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C
T
JC
Thermal resistance junction-to-case 26.6°C/W
T
JA
Thermal resistance junction-to-ambient
(3) (4)
36.5°C/W
T
JP
Thermal resistance junction-to-bottom of thermal pad
(3)
2.1°C/W
φ
JT
Junction-to-top thermal parameter
(3) (4)
0.848°C/W
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Long-term high-temperature storage and/or extended use at maximum recommended operating conditions may result in reduced overall
device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
(3) See technical brief SLMA002 - PowerPAD Thermally Enhanced Package(http://www-s.ti.com/sc/techlit/slma002).
(4) Tested in accordance with the thermal metric definitions of EIA/JESD51-5.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
V
I
Input voltage 8 40 V
T
A
Operating free-air temperature –55 125 °C
ELECTRICAL CHARACTERISTICS
T
A
= –55°C to 125°C, V
IN
= 24 V
dc
, R
T
= 90.9 kΩ, I
KFF
= 150 µA, f
SW
= 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
IN
Input voltage range, VIN 8 40 V
OPERATING CURRENT
I
DD
Quiescent current Output drivers not switching, VFB ≥ 1.5 3.3 mA
0.75 V
BP5
V
BP5
Output voltage I
OUT
≤ 1 mA 4.7 5 5.3 V
OSCILLATOR/RAMP GENERATOR
(1)
f
OSC
Accuracy 8 V ≤ V
IN
≤ 40 V 465 520 585 kHz
V
RAMP
PWM ramp voltage
(2)
V
PEAK
– V
VAL
2 V
V
IH
High-level input voltage, SYNC 2 5 V
V
IL
Low-level input voltage, SYNC 0.8 V
I
SYNC
Input current, SYNC 5 11 µA
Pulse width, SYNC 50 ns
V
RT
RT voltage 2.37 2.5 2.59 V
(1) I
KFF
increases with SYNC frequency, I
KFF
decreases with maximum duty cycle.
(2) Ensured by design. Not production tested.
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