A5975AD STMicroelectronics

A5975AD Up to 2.5 A step-down switching regulator for automotive applications Datasheet - production data Protection against feedback disconnection Thermal shutdown Application Dedicated to automotive applications +623 H SRVHG SDG Description The A5975AD is a step-down monolithic power Features switching regulator with a minimum switch current Qualified following the AEC-Q100 limit of 3.1 A, it is therefore able to deliver up to requirements (see PPAP for more details) 2.5 A DC current to the load depending on the application conditions. The output voltage can be 2.5 A DC output current set from 1.235 V to 35 V. The high current level is Operating input voltage from 4 V to 36 V also achieved thanks to a HSOP8 package with 3.3 V / (2%) reference voltage exposed frame, that allows to reduce the R THJ-A down to approximately 40 C/W. The device uses Output voltage adjustable from 1.235 V to 35 V an internal P-channel DMOS transistor (with a Low dropout operation: 100% duty cycle typical R of 250 m) as switching element DS(on) 500 kHz internally fixed frequency to minimize the size of the external components. An internal oscillator fixes the switching frequency Voltage feed-forward at 500 kHz. Having a minimum input voltage of Zero load current operation only 4 V, it fits automotive applications requiring Internal current limiting device operation even in cold crank conditions. Pulse-by-pulse current limit with the internal Inhibit for zero current consumption frequency modulation offers an effective constant Synchronization current short-circuit protection. Figure 1. Application schematic 8 1 9, 9 7 9 2 / X+ 87 92 9& & 928 7 95 () 1 6<& 5 &203 )% ,1 + ( 3 *1 & & 5 Q) X) . & 9 9 5 . & S X) & Q) V DOOP VL JQDO SO DQHH U SRZ 0 Y March 2021 DocID018761 Rev 2 1/50 This is information on a product in full production. www.st.com 36 / 8 67 *1 *1 73 73 73 73Contents A5975AD Contents 1 Pin settings 6 1.1 Pin connection 6 1.2 Pin description 6 2 Electrical data 7 2.1 Maximum ratings 7 2.2 Thermal data . 7 3 Electrical characteristics . 8 4 Datasheet parameters over the temperature range . 10 5 Functional description 11 5.1 Power supply and voltage reference 12 5.2 Voltage monitor 12 5.3 Oscillator and synchronization . 12 5.4 Current protection . 14 5.5 Error amplifier 15 5.6 PWM comparator and power stage . 16 5.7 Inhibit function . 17 5.8 Thermal shutdown 17 6 Additional features and protection 18 6.1 Feedback disconnection 18 6.2 Output overvoltage protection . 18 6.3 Zero load . 18 7 Closing the loop . 19 7.1 Error amplifier and compensation network 20 7.2 LC filter . 21 7.3 PWM comparator . 22 8 Application information . 24 2/50 DocID018761 Rev 2