STMicroelectronics

L5973AD

2 A switch step down switching regulator

Topologie: Buck
Eingangsspannung (min.): 4.00 V
Eingangsspannung (max.): 36.00 V
Ausgang 1: 35.00 V / 2.000 A

Erstveröffentlichung am 30.11.2003, Version 9 vom

Beschreibung

The L5973AD is a step down monolithic power switching regulator with a switch current limit of 2 A so it is able to deliver more than 1.5 A DC current to the load depending on the application conditions.The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the RthJA down to approximately 40 °C/W.The device uses an internal P-Channel D-MOS transistor (with a typical of 200 mΩ) as switching element to avoid the use of bootstrap capacitor and guarantee high efficiency.An internal oscillator fixes the switching frequency at 500 kHz to minimize the size of external components.Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V 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

  • 2 A internal switch
  • Operating input voltage from 4 V to 36 V
  • 3.3 V / (±2%) reference voltage
  • Output voltage adjustable from 1.235 V to 35 V
  • Low dropout operation: 100% duty cycle
  • 500 kHz Internally fixed frequency
  • Voltage feedforward
  • Zero load current operation
  • Internal current limiting
  • Inhibit for zero current consumption
  • Synchronization
  • Protection against feedback disconnection
  • Thermal shutdownREMARKS:-TABLE 4 RECOMNDED INDUCTOR

Artikel

  Artikel Nr. SPEC Produktserie L
(µH)
L1
(µH)
IR
(A)
IR 1
(A)
ISAT
(A)
ISAT 1
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
RDC1 typ
(Ω)
RDC1 max.
(Ω)
fres
(MHz)
fres 1
(MHz)
Montageart Muster
74456133 PDF WE-PD4 SMT-Speicherdrossel 33 33 2.3 2.3 2.6 2.6 0.094 0.12 0.094 0.12 13 13 SMT
74456147 PDF WE-PD4 SMT-Speicherdrossel 47 47 1.8 1.8 2.14 2.14 0.142 0.19 0.142 0.19 10 10 SMT