L6731B datasheet(12/24 Pages) STMICROELECTRONICS

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L6731B Arkusz danych(PDF) 12 Page - STMicroelectronics

Numer części	L6731B

Szczegółowy opis	Adjustable step-down controller with synchronous rectification Dedicated to DDR Memory

PDF	24 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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12 / 24 page

Device description

L6731B

12/24

5.5

Error amplifier

5.6

Soft start

When both VCC and VIN are above their turn-ON thresholds (VIN is monitored by the OCH pin)

the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a

ramp is generated charging the external capacitor CSS with an internal current generator. The

initial value for this current is 35µA and charges the capacitor up to 0.5V. After that it becomes

10µA until the final charge value of approximately 4V (see Figure 6.).

Figure 5.

Error Amplifier Reference

Figure 6.

Device start-up: Voltage at the SS pin.

2.5V

100K

DDR-IN

VCCDR

0.6V/500KHz

0.6V/250KHz

DDR-IN/2

250KHz

Error Amplifier Ref.

VCC

VIN

0.5V

Vcc

Vin

Vss

4.2V

1.25V

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