STEVAL-ISA101V1 STMicroelectronics

STEVAL-ISA101V1 2 A DC step-down switching regulator with 4 V/36 V input voltage range based on the L5973D Data brief Features V : 4 V to 36 V in V : 1.235 V to 36 V out Output current: 2 A DC Internal oscillator switching frequency: 250 kHz Short-circuit protection Inhibit and thermal shutdown RoHS compliant Description The STEVAL-ISA101V1 demonstration board is based on the L5973D, a step-down monolithic switching regulator with 2 A DC (2.5 A switch peak current) current capability over the output voltage range (1.235 V to 36 V). The operating input voltage ranges from 4 V to 36 V. The device is based on BCD5 technology. The embedded power element is a P-channel D-MOS transistor so the driving stage does not require any bootstrap capacitor and the duty cycle can range up to 100%. An internal oscillator fixes the switching frequency at 250 kHz. A synchronization pin is available when a higher switching frequency (up to 700 kHz) is required. Pulse-by-pulse current protection and a frequency foldback feature always guarantee an effective short-circuit protection. Other features include voltage feed-forward, protection against feedback disconnection, inhibit and thermal shutdown. Previous sales code: EVAL5973D. May 2012 Doc ID 023235 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4.- .- 2 .- .- 2 .- 2 2 .- .- .- 1 .- .- 2 2 ).( -0 / K 2 . 39 6/ .- , 5 2 Schematic diagram STEVAL-ISA101V1 1 Schematic diagram Figure 1. Schematic diagram 6 54 U GNAL SMALL SI U( , WERPLANE K PO 3403 5& 54 %80 N& 6 K N& . P& N& 6 U& 6 / .. - V 2/4 Doc ID 023235 Rev 1 39 40 40 6/ %&62 6)6) 6 4 6 40 6 40 . *0 40 40