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STMicroelectronics L7981

3 A step-down switching regulator

Overview

TopologyBuck Converter
Input voltage4.5-28 V
Switching frequency250-1000 kHz
Output 128 V
IC revision5

Description

The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The QFN and the HSOP packages with exposed pad allow reducing the RthJAdown to 60°C/W and 40°C/W respectively.

Features

  • 3 A DC output current
  • 4.5 V to 28 V input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency, programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • VFQFPN 3 x 3 - 8L and HSOP8 package

REMARKS:-TABLE 7.INDUCTORS

Typical applications

  • Computer
  • XDSL, modems, DC-DC modules
  • Industria
  • Consumer
  • Suitable for LED driving

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447714022SPEC
7 files WE-PD SMT Power Inductor 2.2 8.6 9.5 6.8 8 53 1050 Performance
7447714033SPEC
7 files WE-PD SMT Power Inductor 3.3 7.5 9 8.9 10.5 42 1050 Performance
7447714047SPEC
7 files WE-PD SMT Power Inductor 4.7 7 8 10.4 12.4 34 1050 Performance
7447713082SPEC
7 files WE-PD SMT Power Inductor 8.2 3 4.7 41 49 30 1030 Performance
7447713100SPEC
7 files WE-PD SMT Power Inductor 10 2.6 4.1 52 62 25 1030 Performance
7447713150SPEC
7 files WE-PD SMT Power Inductor 15 2.2 3.4 74 89 19.5 1030 Performance
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples