L4921 Просмотр технического описания (PDF) - STMicroelectronics

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L4921

VERY LOW DROP ADJUSTABLE REGULATORS

STMicroelectronics 

L4920/L4921

Figure 1 : Output Voltage vs. Temperature.

Figure 2 : Foldback Current Limiting.

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 voltagemay 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 packagemay 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.

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