TPS65320-Q1 Datasheet, PDF (1/45 Pages) Texas Instruments – 40-V Step-Down Converter With Eco-mode

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TPS65320-Q1
SLVSAY9F – DECEMBER 2012 – REVISED MARCH 2016
TPS65320-Q1 40-V Step-Down Converter With Eco-mode™ and LDO Regulator
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C4B
• One High-VIN Step-Down Converter
– 3.6- to 40-V Input Range
– 250-mΩ High-Side MOSFET
– 3.2-A Maximum Load Current, 1.1- to 20-V
Output Adjustable
– 100-kHz to 2.5-MHz Adjustable Switch-Mode
Frequency
– Less Than 140-µA Operating Quiescent
Current
• One Low-Dropout Voltage Regulator (LDO)
– 280-mA Current Capability With 28-μA
(Typical) Operating Quiescent Current in No-
Load Condition
– Input Supply Auto-Source to Balance
Efficiency and Low Standby Current
– Power-Good Output (Push-Pull)
– Low-Dropout Voltage of 300 mV at I_OUT = 200
mA (Typical)
• Overcurrent Protection for Both Regulators
• Overtemperature Protection
• 14-Pin HTSSOP Package With PowerPAD™
Package
Typical Application Schematic
VI = 3.6 V to 40 V
Supply
VIN
VIN_LDO
BOOT
SW
EN1
EN2
LDO Input
Auto Source FB1
RT/CLK
COMP
LDO_OUT
SS
Regulator
Control
GND
FB2
TPS65320-Q1
PowerPAD
nRST
1.1 V to 20 V, 3.2 A
1.1 V to 7 V, 280 mA
2 Applications
• Automotive Infotainment and Cluster
• Advanced Driver Assistance System (ADAS)
• Telematics
3 Description
The TPS65320-Q1 device is a combination of a 40-V,
3.2-A, DC-DC step-down converter and a low-dropout
(LDO) regulator. The DC-DC step-down converter,
referred to as the buck regulator, has an integrated
high-side MOSFET. The LDO regulator also has an
integrated MOSFET and a low-input supply current of
28-μA (typical) in a no-load condition. Furthermore,
the LDO regulator has an active-low, push-pull reset
output pin. To reduce heat, the input supply of the
LDO regulator can auto-source from the input voltage
to the output of the buck regulator. The low-voltage
tracking feature can eliminate the need to use a boost
converter during cold-crank conditions.
The buck regulator has a switching frequency range
from 100 kHz to 2.5 MHz that provides a flexible
design to fix system requirements. The external loop
compensation allows for optimization of the converter
response for the appropriate operating conditions. A
low-ripple pulse-skip mode reduces the no-load input
supply current to less than 140 μA.
The device has built-in protection features such as
soft start, current limit, thermal sensing, and
shutdown because of excessive power dissipation.
Furthermore, the device has an internal undervoltage-
lockout (UVLO) function that turns off the device at a
too-low supply voltage.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65320-Q1
HTSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Buck Efficiency Versus Output Current
100
90
80
70
60
50
40
30
20
10
0
0.0
fsSw= 3=0300k0HkHzz
f_Ssw= 2= M2MHHz z
1.0
2.0
Output Current (A)
V_I = 14 V
V_O = 5 V
3.0
4.0
C001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.