TPS65320-Q1 Datasheet, PDF (6/45 Pages) Texas Instruments – 40-V Step-Down Converter With Eco-mode

TPS65320-Q1
SLVSAY9F – DECEMBER 2012 – REVISED MARCH 2016
Recommended Operating Conditions (continued)
over operating free-air temperature range (unless otherwise noted)
EN1
Control
EN2
Operating junction temperature, T_J
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MIN MAX UNIT
0
40
V
0
40
–40
150
°C
6.4 Thermal Information
THERMAL METRIC⁽¹⁾
TPS65320-Q1
PWP (HTSSOP)
UNIT
14 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
49.9
°C/W
31
°C/W
26.6
°C/W
1
°C/W
26.4
°C/W
3.7
°C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRS953.
6.5 Electrical Characteristics
V_I = 6 V to 27 V, EN1 = EN2 = V_I, over-operating free-air temperature range T_A = –40°C to +125°C and maximum operating
junction temperature T_J = –40°C to +150°C, unless otherwise noted. V_I is the voltage on the battery-supply pins, VIN and
VIN_LDO.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
VIN (INPUT POWER SUPPLY)
Operating input voltage
Normal mode, after initial start-up
3.6
14
40 V
Shutdown supply current
Initial start-up voltage
V_(EN1) = V_(EN2) = 0 V, 25°C
2
7 μA
6
40 V
ENABLE AND UVLO (EN1 AND EN2 PINS)
Enable low level
0.7 V
Enable high level
2.5
V
V_(VIN)(f)
Internal UVLO falling threshold
V_(VIN)(r)
Internal UVLO rising threshold
BUCK REGULATOR
Ramp V_(VIN) down until output turns OFF
Ramp V_(VIN) up until output turns ON
2 2.6
2.2 2.8
3V
3.2 V
Operating: non-switching supply
Output capacitor
V_(FB1) = 0.83 V, V_(VIN) = 12 V, 25°C
ESR = 0.001 Ω to 0.1 Ω, large output
capacitance may be required for load
transient
110
10
140 μA
μF
BUCK REGULATOR: HIGH-SIDE MOSFET
On-resistance
BUCK REGULATOR: ERROR AMPLIFIER
V_(VIN) = 12 V, V_(SW) = 6 V
127
250 mΩ
Input current
50
nA
Error-amplifier transconductance
(gm)
–2 µA < I_(COMP) < 2 µA, V_(COMP) = 1 V
310
µS
Error-amplifier transconductance
(gm) during soft start
Error-amplifier dc gain
Error-amplifier bandwidth
–2 µA < I_(COMP) < 2 µA, V_(COMP) = 1 V
V_(FB1) = 0.4 V
V_(FB1) = 0.8 V
70
µS
100
dB
6000
kHz
Error-amplifier source or sink
V_(COMP) = 1 V, 100-mV overdrive
±27
μA
6
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