STMicroelectronics

L5972D

2A switch step down switching regulator

Topologie: Buck
Eingangsspannung (min.): 4.40 V
Eingangsspannung (max.): 36.00 V
Schaltfrequenz (min.): 212.00 kHz
Schaltfrequenz (max.): 275.00 kHz

Erstveröffentlichung am 20.10.2005, Version 10 vom

Beschreibung

The L5972D is a step down monolithic power switching regulator with a minimum switch current limit of 2A so it is able to deliver more than 1.5A DC current to the load depending on the application conditions.The output voltage can be set from 1.235V to 35V.The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250mΩ) as switching element to minimize the size of the external components.An internal oscillator fixes the switching frequency at 250kHz.Having a minimum input voltage of 4.4V only, it is particularly suitable for 5V bus, available in all computer related applications.Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

Merkmale

  • 2A internal switch
  • Operating input voltage from 4.4V to 36V
  • Output voltage adjustable from 1.235V to 35V
  • Low dropout operation: 100% duty cycle
  • 250kHz Internally fixed frequency
  • Voltage feedforward
  • Zero load current operation
  • Internal current limiting
  • Protection against feedback disconnection
  • Thermal shutdownRemarks:-table 4 inductor manufacture

Artikel

  Artikel Nr. SPEC Produktserie L1
(µH)
IR 1
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC1 max.
(Ω)
fres 1
(MHz)
Montageart Muster
74456168 PDF WE-PD4 SMT-Speicherdrossel 68 1.6 1.7 0.187 0.24 8.5 SMT