PM6670 datasheet(32/53 Pages) STMICROELECTRONICS

部品番号	PM6670

部品情報	Complete DDR2/3 memory power supply controller

PDF	53 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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Device description

PM6670

32/53

After a fixed 3ms 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 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 4mA.

Figure 38. Soft-start at heavy load (a) and short-circuit (b) conditions, Pulse-Skip enabled

(a)

(b)

PM6670 データシート(PDF) 32 Page - STMicroelectronics