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STMicroelectronics B5973D

Up to 2 A step down switching regulator for automotive applications

Overview

TopologyBuck Converter
Input voltage4-36 V
Output 135 V / 2 A
IC revision4

Description

The B5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.25 A so it is able to deliver up to 2 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 HSOP8 package (i.e. SO8 package with exposed frame), that allows to reduce the Rth(JA)down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical RDSonof 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

Features

  • Qualified following the AEC-Q100
  • requirements (temperature Grade 1), see
  • PPAP for more details.
  • 2 A DC output current
  • 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
  • 250 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:-Refer page no 25Table 8.Inductor selection

Typical applications

  • Dedicated to automotive applications

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
fres
(MHz)
Mount Samples
74456115
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 15 2.9 3.6 0.043 0.06 17 SMT
74456122
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 22 2.6 3.1 0.071 0.095 14 SMT
74456133
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 33 2.3 2.6 0.094 0.12 13 SMT
Order Code Data­sheet
74456115
74456122
74456133
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
fres
(MHz)
Mount Samples