B5973D STMICROELECTRONICS | Alldatasheet

Document overview

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  • PDF pages: 12

Technical content

Datasheet sections

  • 1 Pin settings
  • 1.1 Pin connection
  • 1.2 Pin description
  • 2 Electrical data
  • 2.1 Maximum ratings
  • 2.2 Thermal data
  • 3 Electrical characteristics
  • 4 Typical characteristics
  • 5 Package mechanical data
  • 6 Revision history

Features

■ Qualified following the AEC-Q100 requirements (temperature Grade 1), see PPAP for more details. ■ Temperature range -40 °C to +125 °C ■ 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 shutdown

Applications

■ Dedicated to automotive applications

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 SO8 package with exposed frame, that allows to reduce the R th(JA) down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical R DSon of 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 4V 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. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. HSOP8 exposed pad Figure 1. Typical application

1 Pin settings

1.1 Pin connection

Figure 2. Pin connection (top view)

1.2 Pin description

Table 1. Pin description 2 SYNCH Master/slave synchronization. 4 COMP E/A output for frequency compensation. 6 VREF 3.3 V V REF. No cap is requested for stability. 8 VCC Unregulated DC input voltage.

2 Electrical data

2.1 Maximum ratings

2.2 Thermal data

Table 2. Absolute maximum ratings I1 Maximum output current int. limit. Table 3. Thermal data

3 Electrical characteristics

Table 4. Electrical characteristics Dynamic characteristics (see test circuit).

4 Typical characteristics

Figure 3. Line regulation Figure 4. Shutdown current vs Figure 5. Output voltage vs junction Figure 6. Switching frequency vs Figure 7. Quiescent current vs

5 Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com

Figure 12. Package dimensions Table 5. HSOP8 mechanical data

6 Revision history

Table 6. Document revision history