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
20 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.
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 20 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
IO = 200 mA (Typical)
Overcurrent Protection for Both Regulators
Overtemperature Protection
14-Pin HTSSOP Package With PowerPAD™ Integrated Circuit Package
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