STMicroelectronics

L7980

2 A step-down switching regulator

Topologie: Buck
Eingangsspannung (min.): 4.50 V
Eingangsspannung (max.): 28.00 V
Schaltfrequenz (min.): 250.00 kHz
Schaltfrequenz (max.): 1000.00 kHz

Erstveröffentlichung am 19.02.2013, Version 6 vom

Beschreibung

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.

Merkmale

  • 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 packageRemarks
  • 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

Artikel

  Artikel Nr. SPEC Produktserie L
(mm)
Panel Thickness
(mm)
L
(µH)
L1
(µH)
IR
(A)
IR 1
(A)
ISAT
(A)
ISAT 1
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
RDC1 typ
(Ω)
RDC1 max.
(Ω)
fres
(MHz)
fres 1
(MHz)
Montageart Version Muster
701518000 PDF WA-SNSN Snap-In Keyslot Snap Locking on both ends 31.7 1.7
74458122 PDF WE-PD4 SMT-Speicherdrossel 22 22 3.5 3.5 7 7 0.043 0.047 0.043 0.047 13 13 SMT
74458133 PDF WE-PD4 SMT-Speicherdrossel 33 33 3 3 5.5 5.5 0.06 0.066 0.06 0.066 10 10 SMT
74458147 PDF WE-PD4 SMT-Speicherdrossel 47 47 2.6 2.6 4.5 4.5 0.076 0.086 0.076 0.086 8.4 8.4 SMT
744771112 PDF WE-PD SMT-Speicherdrossel 12 3.91 4.85 23 27 19.7 Standard
74477110 PDF WE-PD SMT-Speicherdrossel 10 5 5.5 18 25 21.5 Standard
744771115 PDF WE-PD SMT-Speicherdrossel 15 3.75 4.55 25 30 16.6 Standard
744771008 PDF WE-PD SMT-Speicherdrossel 8.2 6.25 6.25 14 20 25 Standard
7447779004 PDF WE-PD SMT-Speicherdrossel 4.7 3.16 4.4 28 32 37 Robust
7447779002 PDF WE-PD SMT-Speicherdrossel 2.2 4.2 6 16 20 60 Robust
7447779003 PDF WE-PD SMT-Speicherdrossel 3.3 3.3 4.5 26 30 55 Robust