Datasheet

TPS54040
www.ti.com SLVS918A –MARCH 2009–REVISED SEPTEMBER 2013
PACKAGE DISSIPATION RATINGS
(1)
THERMAL IMPEDANCE
PACKAGE
JUNCTION TO AMBIENT
MSOP 57 °C/W
(1) Test board conditions:
A. 3 inches × 3 inches, 2 layers, thickness: 0.062 inch
B. 2-ounce copper traces located on the top and bottom of the PCB
C. 6 (13 mil diameters) THERMAL VIAS LOCATED UNDER THE DEVICE PACKAGE
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 150°C, VIN = 3.5 to 42V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 3.5 42 V
Internal undervoltage lockout
No voltage hysteresis, rising and falling 2.5 V
threshold
Shutdown supply current EN = 0 V, 25°C, 3.5 V ≤ VIN ≤ 42 V 1.3 4
μA
Operating : nonswitching supply
VSENSE = 0.83 V, VIN = 12 V, 25°C 116 136
current
ENABLE AND UVLO (EN PIN)
Enable threshold voltage No voltage hysteresis, rising and falling, 25°C 0.9 1.25 1.55 V
Enable threshold +50 mV –3.8
Input current μA
Enable threshold –50 mV –0.9
Hysteresis current –2.9 μA
VOLTAGE REFERENCE
T
J
= 25°C 0.792 0.8 0.808
Voltage reference V
0.784 0.8 0.816
HIGH-SIDE MOSFET
VIN = 3.5 V, BOOT-PH = 3 V 300
On-resistance mΩ
VIN = 12 V, BOOT-PH = 6 V 200 410
ERROR AMPLIFIER
Input current 50 nA
Error amplifier transconductance (g
M
) –2 μA < I
COMP
< 2 μA, V
COMP
= 1 V 97 μMhos
–2 μA < I
COMP
< 2 μA, V
COMP
= 1 V,
Error amplifier transconductance (g
M
)
26 μMhos
during slow start
V
VSENSE
= 0.4 V
Error amplifier dc gain V
VSENSE
= 0.8 V 10,000 V/V
Error amplifier bandwidth 2700 kHz
Error amplifier source/sink V
(COMP)
= 1 V, 100 mV overdrive ±7 μA
COMP to switch current
1.9 A/V
transconductance
CURRENT LIMIT
Current limit threshold VIN = 12 V, T
J
= 25°C 0.6 0.94 A
THERMAL SHUTDOWN
Thermal shutdown 182 °C
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