TPS54388-Q1_15 Datasheet, PDF (5/40 Pages) Texas Instruments – TPS54388-Q1 2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down SWIFT™ Switcher

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TPS54388-Q1
SLVSAF1D – OCTOBER 2010 – REVISED APRIL 2015
7.4 Thermal Information
THERMAL METRIC⁽¹⁾
TPS54388-Q1
RTE
UNIT
16 PINS
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
43.5
°C/W
46.1
°C/W
15.5
°C/W
0.7
°C/W
15.5
°C/W
3.8
°C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
7.5 Electrical Characteristics
T_J = –40°C to 150°C, V_(VIN) = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION
CONDITIONS
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold
VIN UVLO start
VIN UVLO stop
Shutdown supply current
Quiescent current, I_(q)
ENABLE AND UVLO (EN PIN)
V_(EN) = 0 V, 25°C, 2.95 V ≤ V_(VIN) ≤ 6 V
V_(SENSE) = 0.9 V, V_(VIN) = 5 V, 25°C, Rt = 400 kΩ
Enable threshold
Rising
Falling
Input current
Enable threshold + 50 mV
Enable threshold – 50 mV
VOLTAGE REFERENCE (VSENSE PIN)
Voltage reference
MOSFET
2.95 V ≤ V_(VIN) ≤ 6 V, –40°C <T_J < 150°C
High-side switch resistance
Low-side switch resistance
ERROR AMPLIFIER
V_(BOOT-PH) = 5 V
V_(BOOT-PH) = 2.95 V
V_(VIN) = 5 V
V_(VIN) = 2.95 V
Input current
Error-amplifier transconductance (g_m)
Error-amplifier transconductance (g_m) during
slow start
Error amplifier source and sink
COMP to high-side FET current g_m
–2 μA < I_(COMP) < 2 μA, V_(COMP) = 1 V
–2 μA < I_(COMP) < 2 μA, V_(COMP) = 1 V,
V_(VSENSE) = 0.4 V
V_(COMP) = 1 V, 100-mV overdrive
MIN TYP MAX UNIT
2.28 2.5 V
2.45 2.6
5.5
15 μA
515 750 μA
1.25
V
1.18
–1.6
μA
–1.6
0.79 0.8 0.811 V
12
30
mΩ
16
30
13
30
mΩ
17
30
2
nA
245
μS
79
μS
±20
μA
25
S
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