TPS54331_15 Datasheet, PDF (6/36 Pages) Texas Instruments – TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode™

TPS54331
SLVS839F – JULY 2008 – REVISED OCTOBER 2014
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7.4 Thermal Information
THERMAL METRIC⁽¹⁾
D
8 PINS
DDA
8 PINS
UNIT
R_θJA
R_θJC(top)
R_θJB
ψ_JT
ψ_JB
R_θJC(bot)
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
116.3
53.7
57.1
12.9
56.5
—
48.7
52.4
25.5
°C/W
8.4
25.2
2.3
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Electrical Characteristics
T_J = –40°C to 150°C, VIN = 3.5 to 28 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold Rising and falling
Shutdown supply current
EN = 0V, VIN = 12V, –40°C to 85°C
Operating – non-switching supply current VSENSE = 0.85 V
ENABLE AND UVLO (EN PIN)
Enable threshold
Rising and falling
Input current
Enable threshold – 50 mV
Input current
Enable threshold + 50 mV
VOLTAGE REFERENCE
Voltage reference
HIGH-SIDE MOSFET
On resistance
BOOT-PH = 3 V, VIN = 3.5 V
BOOT-PH = 6 V, VIN = 12 V
ERROR AMPLIFIER
Error amplifier transconductance (gm)
Error amplifier DC gain⁽¹⁾
Error amplifier unity gain bandwidth⁽¹⁾
–2 μA < I_(COMP) < 2 μA, V_(COMP) = 1 V
VSENSE = 0.8 V
5-pF capacitance from COMP to GND pins
Error amplifier source/sink current
Switch current to COMP
transconductance
V_(COMP) = 1 V, 100-mV overdrive
VIN = 12 V
PULSE SKIPPING ECO-MODE™
Pulse skipping Eco-mode™ switch
current threshold
CURRENT LIMIT
Current-limit threshold
VIN = 12 V
THERMAL SHUTDOWN
Thermal Shutdown
SLOW START (SS PIN)
Charge current
SS to VSENSE matching
V_(SS) = 0.4 V
V_(SS) = 0.4 V
(1) Specified by design
MIN TYP MAX UNIT
3.5 V
1
4 μA
110 190 μA
1.25 1.35 V
-1
μA
-4
μA
0.772 0.8 0.828 V
115 200 mΩ
80 150
92
μmhos
800
V/V
2.7
MHz
±7
μA
12
A/V
160
mA
3.5 5.8
A
165
°C
2
μA
10
mV
6
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