TPS65320C-Q1 Datasheet, PDF (1/4 Pages) Texas Instruments – 36-V Step-Down Converter

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TPS65320C-Q1
SLVSD50A – MARCH 2016 – REVISED MARCH 2016
TPS65320C-Q1 36-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 DC-DC Converter
– Input Range of 3.6-V to-36-V
– 250-mΩ High-Side MOSFET
– Maximum Load Current 3.2-A, Output
Adjustable 1.1-V to 20-V
– Adjustable Switching Frequency 100-kHz to
2.5-MHz
– Synchronizes to External Clock
– High Efficiency at Light Loads With Pulse-
Skipping Eco-mode™ Control Scheme
– Maximum 140-µA Operating Quiescent
Current
• One Low-Dropout Voltage (LDO) Regulator
– Input Range of 3-V to 36-V, with Auto-Source
to Balance Efficiency and Lower Standby
Current
– 280-mA Current Capability With Typical 45-µA
Quiescent Current in No-Load Condition
– Power-Good Output (Push-Pull)
– Low-Dropout Voltage of 300-mV at
I_O = 200-mA (Typical)
• Overcurrent Protection for Both Regulators
• Overtemperature Protection
• 14-Pin HTSSOP Package With PowerPAD™
Integrated Circuit Package
Typical Application Schematic
VI = 3.6 V to 36 V
Supply
VIN
VIN_LDO
BOOT
SW
EN1
LDO Input
EN2 _{Auto Source FB1}
RT/CLK
COMP
LDO_OUT
SS
Regulator
Control
GND
FB2
TPS65320C-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)
• Automotive Telematics, eCall
3 Description
The TPS65320C-Q1 device is a combination of a
high-VIN DC-DC step-down converter, referred to as
the buck regulator, with an adjustable switch-mode
frequency from 100-kHz to 2.5-MHz, and a high-VIN
280-mA low-dropout (LDO) regulator. The input range
is 3.6-V to 36-V for the buck regulator, and 3-V to 36-
V for the LDO regulator. The buck regulator has an
integrated high-side MOSFET. The LDO regulator
features a low-input supply current of 45-μA typical in
no-load, also has an integrated MOSFET with an
active-low, push-pull reset output pin. The input
supply of the LDO regulator auto-source from the
output of the buck regulator when it is in operation.
Low-voltage tracking feature enables TPS65320C-Q1
to track the input supply during cold-crank conditions.
The buck regulator provides a flexible design to fit
system needs. The external loop compensation circuit
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 maximum 140-μA.
The device has built-in protection features such as
soft start, current-limit, thermal sensing and shutdown
due to excessive power dissipation. Furthermore, the
device has an internal undervoltage-lockout (UVLO)
function that turns off the device when the supply
voltage is too low.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65320C-Q1
HTSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Buck Efficiency Versus Output Current
100
90
80
70
60
50
40
30
20
10
fs = 300 kHz
fs = 2 MHz
0
0
1
2
3
4
Load Current (A)
D001
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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.