PM6670STR datasheet(32/53 Pages) STMICROELECTRONICS

부품명	PM6670STR

상세설명	Complete DDR2/3 memory power supply controller

PDF	53 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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32 / 53 page

Device description

PM6670S

32/53

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

doesn't reach the under voltage 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 38 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 38.

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

(a)

(b)

PM6670STR 데이터시트(PDF) 32 Page - STMicroelectronics