A5973AD STMicroelectronics

A5973AD Up to 1.5 A step-down switching regulator for automotive applications Datasheet - production data Applications Dedicated to automotive applications HSOP8 - exposed pad Description The A5973AD 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 Qualified following the AEC-Q100 current to the load depending on the application requirements (see PPAP for more details) conditions. The output voltage can be set from 1.235 V to V . The high current level is also 1.5 A DC output current IN achieved thanks to an HSOP8 package with an Operating input voltage from 4 V to 36 V exposed frame, that allows to reduce the R th(JA) 3.3 V / ( 2%) reference voltage down to approximately 40 C/W. The device uses an internal P-channel DMOS transistor (with Output voltage adjustable from 1.235 V to V IN a typical R of 250 m) as a switching DS(on) Low dropout operation: 100% duty cycle element to minimize the size of the external 500 kHz internally fixed frequency components. An internal oscillator fixes the switching frequency at 500 kHz. Having Voltage feed-forward a minimum input voltage of 4 V only it fits the Zero load current operation automotive applications requiring the device Internal current limiting operation even in cold crank conditions. A pulse- by-pulse current limit with the internal frequency Inhibit for zero current consumption modulation offers an effective constant current Synchronization short-circuit protection. Protection against feedback disconnection Thermal shutdown Figure 1. Application schematic A5973AD August 2014 DocID13958 Rev 9 1/40 This is information on a product in full production. www.st.comContents A5973AD 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 8 5 Functional description . 9 5.1 Power supply and voltage reference . 9 5.2 Voltages monitor 10 5.3 Oscillator and synchronization . 10 5.4 Current protection 11 5.5 Error amplifier 12 5.6 PWM comparator and power stage . 12 5.7 Inhibit function . 14 5.8 Thermal shutdown 14 6 Additional features and protection 15 6.1 Feedback disconnection 15 6.2 Output overvoltage protection . 15 6.3 Zero load . 15 7 Closing the loop . 16 7.1 Error amplifier and compensation network 16 7.2 LC filter . 18 7.3 PWM comparator . 19 2/40 DocID13958 Rev 9