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L4921 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce L4921
Description  VERY LOWDROP ADJUSTABLE REGULATORS
PDF  7 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4921 Fiches technique(HTML) 4 Page - STMicroelectronics

  L4921 Datasheet HTML 1Page - STMicroelectronics L4921 Datasheet HTML 2Page - STMicroelectronics L4921 Datasheet HTML 3Page - STMicroelectronics L4921 Datasheet HTML 4Page - STMicroelectronics L4921 Datasheet HTML 5Page - STMicroelectronics L4921 Datasheet HTML 6Page - STMicroelectronics L4921 Datasheet HTML 7Page - STMicroelectronics  
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Figure 3 : Quiescent Current vs. Output Current
(Vo = 5V).
APPLICATION INFORMATION
1) The L4920 and L4921 have VREF
≅ 1.25V.Then
the output voltage can be set down to VREF but
Vi must be greater than 5.2V (Tj =25
°C).
2) As the regulator reference voltage source works
in closed loop, the reference voltage may change
in foldbackcondition.
3) For applications with high Vl, the total power
dissipation of the device with respect to the ther-
mal resistance of the package may be limiting . The
total power dissipation is :
Ptot =Vi lq +(Vi -Vo)lo
A typical curve giving the quiescent current lq as a
function of the output current lo is shown in fig. 3.
Figure 1 : Output Voltage vs. Temperature.
Figure 2 : Foldback Current Limiting.
L4920/L4921
4/7



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