PM6670ASTR datasheet(33/54 Pages) STMICROELECTRONICS

No de pièce	PM6670ASTR

Description	Complete DDR2/3 memory power supplies controller

PDF	54 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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33 / 54 page

PM6670AS

Device description

33/54

After a fixed 3 ms total time, the soft-start finishes and UVP is released: if the output voltage

doesn't reach the Power-Good lower threshold within soft-start duration, the UVP condition

is detected and the device performs a soft end and latches off. Depending on the load

conditions, the inductor current may or may not reach the nominal value of the current limit

during the soft-start (Figure 36 shows two examples).

7.1.7

Power-Good signal

The PG pin is an open drain output used to monitor output voltage through VSNS (in fixed

output voltage mode) or MODE (in adjustable output voltage mode) pins and is enabled

after the soft-start timer has expired. PG signal is held low if the VDDQ output voltage drops

10 % below or rises 10 % above the nominal regulated value. The PG output can sink

current up to 4 mA.

Figure 36. Soft-start at heavy load (a) and short-circuit (b) conditions, Pulse-Skip enabled

(a)

(b)

PM6670ASTR Fiches technique(PDF) 33 Page - STMicroelectronics