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STMicroelectronics L7980

2 A step-down switching regulator

Overview

TopologyBuck Converter
Input voltage4.5-28 V
Switching frequency250-1000 kHz
IC revision6

Description

The L7980 device is a step-down switching regulator with a 2.5 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 2 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 externallyadjusted up to 1 MHz.

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

Features

  • 2 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

  • 27uH inductor value is added from design example, refer page number 22
  • Suggested inductor values ranges also given table 7 from page number 17
  • Output current to be taken from general value. i.e 2A
  • Some of the Product and series to be added nearest inductor values rangesREMARKS:-Table 7.inductors

Typical applications

  • Networking: XDSL, modems, DC-DC modules
  • Consumer:STB, DVD, DVD recorder, car audio, LCD
  • Computer:Optical storage, hard disk drive, printers,
  • Industrial:PLD, PLA, FPGA, chargers
  • LED driving

Products

Order Code Data­sheet Downloads Product seriesL
(mm)
Panel Thickness
(mm)
L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionMount Samples
7447779002SPEC
7 files WE-PD SMT Power Inductor 7.3 2.2 4.2 6 16 20 60 7345 Robust SMT
7447779003SPEC
7 files WE-PD SMT Power Inductor 7.3 3.3 3.3 4.5 26 30 55 7345 Robust SMT
7447779004SPEC
7 files WE-PD SMT Power Inductor 7.3 4.7 3.16 4.4 28 32 37 7345 Robust SMT
744771008SPEC
7 files WE-PD SMT Power Inductor 12 8.2 6.25 6.25 14 20 25 1260 Standard SMT
74477110SPEC
7 files WE-PD SMT Power Inductor 12 10 5 5.5 18 25 21.5 1260 Standard SMT
744771112SPEC
7 files WE-PD SMT Power Inductor 12 12 3.91 4.85 23 27 19.7 1260 Standard SMT
744771115SPEC
7 files WE-PD SMT Power Inductor 12 15 3.75 4.55 25 30 16.6 1260 Standard SMT
74458122SPEC
9 files WE-PD4 SMT Power Inductor 18.54 22 3.5 7 43 47 13 X SMT
74458133SPEC
9 files WE-PD4 SMT Power Inductor 18.54 33 3 5.5 60 66 10 X SMT
74458147SPEC
9 files WE-PD4 SMT Power Inductor 18.54 47 2.6 4.5 76 86 8.4 X SMT
701518000SPEC
3 files WA-SNSN Snap-In Keyslot Snap Locking on both ends 31.7 1.7
Samples
Order Code Data­sheet Downloads Product seriesL
(mm)
Panel Thickness
(mm)
L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionMount Samples