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L6731B 数据表(PDF) 7 Page - STMicroelectronics

部件名 L6731B
功能描述  Adjustable step-down controller with synchronous rectification Dedicated to DDR Memory
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6731B 数据表(HTML) 7 Page - STMicroelectronics

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L6731B
Pin connections and functions
7/24
8
OCL
A resistor connected from this pin to ground sets the valley- current-limit. The valley
current is sensed through the low-side MOSFET(s). The internal current generator
sources a current of 100µA (IOCL) from this pin to ground through the external resistor
(ROCL). The over-current threshold is given by the following equation:
Connecting a capacitor from this pin to GND helps in reducing the noise injected from
VCC to the device, but can be a low impedance path for the high-frequency noise
related to the GND. Connect a capacitor only to a "clean" GND.
9
OCH
A resistor connected from this pin and the high-side MOSFET(s) drain sets the peak-
current-limit. The peak current is sensed through the high-side MOSFET(s). The
internal 100µA current generator (IOCH) sinks a current from the drain through the
external resistor (ROCH). The over-current threshold is given by the following
equation:
10
PHASE
This pin is connected to the source of the high-side MOSFET(s) and provides the
return path for the high-side driver. This pin monitors the drop across both the upper
and lower MOSFET(s) for the current limit together with OCH and OCL.
11
HGATE
This pin is connected to the high-side MOSFET(s) gate.
12
BOOT
Through this pin is supplied the high-side driver. Connect a capacitor from this pin to
the PHASE pin and a diode from VCCDR to this pin (cathode versus BOOT).
13
PGND
This pin has to be connected closely to the low-side MOSFET(s) source in order to
reduce the noise injection into the device.
14
LGATE
This pin is connected to the low-side MOSFET(s) gate.
15
VCCDR
5V internally regulated voltage. It is used to supply the internal drivers. Filter it to
ground with at least 1µF ceramic cap.
16
VCC
Supply voltage pin. The operative supply voltage range is from 4.5V to 14V.
Table 3.
Pin functions
IVALLEY
IOCL IOCL
2RDSONLS
---------------------------------
=
IPEAK
IOCH ROCH
RDSONHS
---------------------------------
=


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