A5972D STMicroelectronics

A5972D Up to 1.5 A step-down switching regulator for automotive applications Datasheet - production data Applications Dedicated to automotive applications Description SO-8 The A5972D is a step-down monolithic power switching regulator with a minimum switch current Features limit of 1.8 A so it is able to deliver up to 1.5 A DC current to the load depending on the application Qualified following the AEC-Q100 conditions. The output voltage can be set from requirements (see PPAP for more details) 1.235 V to V . IN 1.5 A DC output current The device uses an internal P-channel DMOS Operating input voltage from 4 V to 36 V transistor (with a typical R of 250 m ) as DS(on) 3.3 V / ( 2%) reference voltage a switching element to minimize the size of the external components. Output voltage adjustable from 1.235 V to V IN An internal oscillator fixes the switching frequency Low dropout operation: 100% duty cycle at 250 kHz. Having a minimum input voltage of 250 kHz internally fixed frequency 4 V only it fits the automotive applications Voltage feedforward requiring the device operation even in cold crank conditions. A pulse-by-pulse current limit with the Zero load current operation internal frequency modulation offers an effective Internal current limiting constant current short-circuit protection. Inhibit for zero current consumption Protection against feedback disconnection Thermal shutdown Figure 1. Application schematic November 2015 DocID13956 Rev 7 1/37 This is information on a product in full production. www.st.comContents A5972D Contents 1 Pin settings 4 1.1 Pin connection 4 1.2 Pin description 4 2 Electrical data 5 2.1 Maximum ratings 5 2.2 Thermal data . 5 3 Electrical characteristics . 6 4 Datasheet parameters over the temperature range 7 5 Functional description . 8 5.1 Power supply . 8 5.2 Voltages monitor . 9 5.3 Current protection 9 5.4 Error amplifier 10 5.5 PWM comparator and power stage . 10 5.6 Thermal shutdown .11 6 Additional features and protection 12 6.1 Feedback disconnection 12 6.2 Output overvoltage protection . 12 6.3 Zero load . 12 7 Closing the loop . 13 7.1 Error amplifier and compensation network 14 7.2 LC filter . 15 7.3 PWM comparator . 16 8 Application information . 18 8.1 Component selection 18 8.2 Layout considerations . 20 2/37 DocID13956 Rev 7