ST1S41PUR STMicroelectronics

ST1S41 4 A step-down switching regulator Datasheet - production data Applications P/ASIC/DSP/FPGA core and I/O supplies Point of load for: STB, TVs, DVD Optical storage, hard disk drive, printers, audio/graphic cards VFQFPN8 4x4 HSOP8 Description The ST1S41 is an internally compensated 850 Features kHz fixed-frequency PWM synchronous step- down regulator. The ST1S41 operates from 4.0 V 4 A output current to 18 V input, while it regulates an output voltage 4.0 V to 18 V input voltage as low as 0.8 V and up to V . IN Output voltage adjustable from 0.8 V The ST1S41 integrates 95 m high-side switch 850 kHz switching frequency and 69 m synchronous rectifier allowing very Internal soft-start high efficiency with very low output voltages. Integrated 95 m and 69 m power The peak current mode control with internal MOSFETs compensation delivers a very compact solution with a minimum component count. All ceramic capacitor Enable The ST1S41 is available in VFQFPN 4 mm x 4 mm 8-lead package and HSOP-8. Cycle-by-cycle current limiting Current foldback short-circuit protection VFQFPN 4x4-8L and HSOP-8 packages Figure 1. Application circuit L VIN VOUT 7 6 VINSW SW 1 VINA 2 R1 EN ST1S41 3 Cin a FB Cout Cin sw R2 PGND ePAD/GND 8 9 4 AM15058v1 August 2019 DocID023654 Rev 3 1/27 This is information on a product in full production. www.st.com 27Contents ST1S41 Contents 1 Pin settings 3 1.1 Pin connection 3 1.2 Pin description 3 2 Maximum ratings 4 3 Thermal data . 4 4 Electrical characteristics . 5 5 Functional description . 7 5.1 Internal soft-start 8 5.2 Error amplifier and control loop stability . 8 5.3 Overcurrent protection . 13 5.4 Enable function 13 5.5 Hysteretic thermal shutdown 13 6 Application information . 14 6.1 Input capacitor selection 14 6.2 Inductor selection . 15 6.3 Output capacitor selection 16 6.4 Thermal dissipation . 17 6.5 Layout consideration 18 7 Demonstration board . 20 8 Typical characteristics 22 9 Package information 23 10 Order codes . 28 11 Revision history . 29 2/27 DocID023654 Rev 3