ST1S14PHR STMicroelectronics

ST1S14 Up to 3 A step-down switching regulator Datasheet - production data Applications Factory automation Printers DC-DC modules +623 H SRVHG SDG HSOP8 - exposed pad High current LED drivers Features Description The ST1S14 is a step-down monolithic power 3 A DC output current switching regulator able to deliver up to 3 A DC Operating input voltage from 5.5 V to 48 V current to the load depending on the application 850 kHz internally fixed switching frequency conditions. The high current level is also achieved thanks to a HSOP8 package with exposed frame, Internal soft-start that allows to reduce the R down to th(JA) Power good open collector output approximately 40 C/W. The output voltage can Current mode architecture be set from 1.22 V. The device uses an internal N- channel DMOS transistor (with a typical R of Embedded compensation network DS(on) 200 m) as the switching element to minimize the Zero load current operation size of the external components. The internal Internal current limiting oscillator fixes the switching frequency at 850 kHz. Power good open collector output validates Inhibit for zero current consumption the regulated output voltage as soon as it reaches 2 mA maximum quiescent current over the regulation. Pulse-by-pulse current limit offers temperature range an effective constant current short-circuit 250 m typ. R DS(on) protection. Current foldback decreases overstress in a persistent short-circuit condition. Thermal shutdown Figure 1. Application schematic 3*223*22 && )) QQ 88 67 6 67 6 // ++ XX 77 928928 7 %22 : 6 11 9,9, 1 9, 55 .. 3*22 (1 55 .. (1 % ) *1 && && && && )) XX )) QQ )) XX 55 .. 6736 / 6736 / 88 O L D Q J V OO VPD *1*1 *1*1 H Q S O D SRZHU December 2020 DocID17977 Rev 3 1/46 This is information on a product in full production. www.st.com 46Contents ST1S14 Contents 1 Pin settings 6 1.1 Pin connection 6 1.2 Pin description 6 1.3 Enable inputs . 6 2 Electrical data 7 2.1 Maximum ratings 7 2.2 Thermal data . 7 2.3 ESD protection 7 3 Electrical characteristics . 8 4 Function description 10 4.1 Power supply and voltage reference .11 4.2 Voltage monitor .11 4.3 Soft-start .11 4.4 Error amplifier 13 4.5 Inhibit function . 13 4.6 Thermal shutdown 13 5 Additional features and limitations 14 5.1 Maximum duty cycle . 14 5.2 Minimum output voltage over V range 15 IN 6 Closing the loop . 16 6.1 G (s) control to output transfer function 17 CO 6.2 Error amplifier compensation network . 18 6.3 Voltage divider . 19 6.4 Total loop gain . 20 7 Application information . 22 7.1 Component selection 22 7.1.1 Input capacitor 22 2/46 DocID17977 Rev 3