L4972A
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STMicroelectronics L4972A

Manufacturer No:
L4972A
Manufacturer:
STMicroelectronics
Package:
Tube
Description:
IC REG BUCK ADJUSTABLE 2A 20DIP
Delivery:
Payment:
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Product Introduction

Overview

The L4972A is a stepdown monolithic power switching regulator produced by STMicroelectronics. It delivers up to 2A of output current with an adjustable output voltage ranging from 5.1V to 40V. This device is realized using BCD mixed technology, which integrates isolated vertical DMOS power transistors along with mixed CMOS/Bipolar transistors. The L4972A is particularly suited for microprocessor-based systems due to its diagnostic and control functions, including reset and power fail signals, feed-forward line regulation, soft start, and thermal protection.

Key Specifications

Parameter Min. Typ. Max. Unit
Input Voltage Range (pin 11) 15 - 50 V
Output Voltage 5 5.1 5.2 V
Output Current - - 2 A
Line Regulation 12 - 30 mV
Load Regulation 7 - 20 mV
Dropout Voltage between Pin 11 and 20 0.25 - - V
Switching Frequency - - 200 KHz

Key Features

  • 2A output current
  • Output voltage adjustable from 5.1V to 40V
  • Internal feed-forward line regulation
  • Internal current limiting and thermal shutdown
  • Precise 5.1V ± 2% on-chip reference voltage
  • Reset and power fail functions with delay and hysteresis
  • Input/output sync pin for multiple device synchronization
  • Under-voltage lockout with hysteresis
  • PWM latch for single pulse per period
  • Very high efficiency and fast switching times
  • Soft start function to prevent output overcurrents at turn-on

Applications

The L4972A is particularly suitable for microprocessor-based systems due to its integrated diagnostic and control functions. It can be used in various applications such as:

  • Power supplies for microprocessors and other digital circuits
  • Multiple supply systems where synchronization between regulators is required
  • Systems requiring high efficiency and fast switching times
  • Applications needing precise voltage regulation and protection features like thermal shutdown and current limiting

Q & A

  1. What is the output current capability of the L4972A?

    The L4972A can deliver up to 2A of output current.

  2. What is the adjustable output voltage range of the L4972A?

    The output voltage can be adjusted from 5.1V to 40V.

  3. What technology is used in the L4972A?

    The L4972A is realized using BCD mixed technology, integrating isolated vertical DMOS power transistors and mixed CMOS/Bipolar transistors.

  4. What are the key diagnostic and control functions of the L4972A?

    The device includes reset and power fail functions, feed-forward line regulation, soft start, and thermal protection.

  5. How does the soft start function work in the L4972A?

    The soft start function prevents output overcurrents at turn-on by clamping the error amplifier with an external capacitor and allowing it to rise linearly under the charge of an internal constant current source.

  6. What is the purpose of the PWM latch in the L4972A?

    The PWM latch eliminates multiple pulsing within a period, even in noisy environments.

  7. How can multiple L4972A devices be synchronized?

    Multiple devices can be synchronized by connecting their sync input pins together or via an external sync pulse.

  8. What is the thermal shutdown threshold of the L4972A?

    The thermal shutdown occurs when the junction temperature reaches about 150°C, with a hysteresis to prevent unstable conditions.

  9. What are the available package options for the L4972A?

    The device is available in PowerDIP20 (16+2+2) and SO20 packages.

  10. What is the typical switching frequency of the L4972A?

    The switching frequency can be up to 200KHz.

Product Attributes

Function:Step-Down
Output Configuration:Positive
Topology:Buck
Output Type:Adjustable
Number of Outputs:1
Voltage - Input (Min):15V
Voltage - Input (Max):50V
Voltage - Output (Min/Fixed):5.1V
Voltage - Output (Max):40V
Current - Output:2A
Frequency - Switching:100kHz ~ 200kHz
Synchronous Rectifier:No
Operating Temperature:-40°C ~ 150°C (TJ)
Mounting Type:Through Hole
Package / Case:20-DIP (0.300", 7.62mm)
Supplier Device Package:20-PowerDIP
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Similar Products

Part Number L4972A L4972AD L4974A L4975A L4902A L4970A
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Product Status Last Time Buy Last Time Buy Last Time Buy Active Obsolete Active
Function Step-Down Step-Down Step-Down Step-Down Step-Down Step-Down
Output Configuration Positive Positive Positive Positive Positive Positive
Topology Buck Buck Buck Buck Buck Buck
Output Type Adjustable Adjustable Adjustable Adjustable Fixed Adjustable
Number of Outputs 1 1 1 1 2 1
Voltage - Input (Min) 15V 15V 15V 15V - 15V
Voltage - Input (Max) 50V 50V 50V 50V 24V 50V
Voltage - Output (Min/Fixed) 5.1V 5.1V 5.1V 5.1V 5V 5.1V
Voltage - Output (Max) 40V 40V 40V 40V - 40V
Current - Output 2A 2A 3.5A 5A 300mA 10A
Frequency - Switching 100kHz ~ 200kHz 100kHz ~ 200kHz 100kHz ~ 200kHz 200kHz ~ 500kHz - 200kHz
Synchronous Rectifier No No No No No No
Operating Temperature -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ)
Mounting Type Through Hole Surface Mount Through Hole Through Hole Through Hole Through Hole
Package / Case 20-DIP (0.300", 7.62mm) 20-SOIC (0.295", 7.50mm Width) 20-DIP (0.300", 7.62mm) Multiwatt-15 (Vertical, Bent and Staggered Leads) Heptawatt-7 (Vertical, Bent and Staggered Leads) Multiwatt-15 (Vertical, Bent and Staggered Leads)
Supplier Device Package 20-PowerDIP 20-SO 20-PowerDIP 15-Multiwatt 7-HEPTAWATT 15-Multiwatt

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