l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 9

• Manufacturer Part Number: l6730cqtr
• Description: Adjustable Step-down Controller With Synchronous Rectification
• Manufacturer: STMicroelectronics

L6730C - L6730D
Table 3.
11
12
13
14
15
16
17
18
19
20
Pins connection
PGOOD
PHASE
HGATE
LGATE
V
PGND
BOOT
OCH
OCL
V
CCDR
CC
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 100 A (I
external resistor (R
equation:
Connecting a capacitor from this pin to GND helps in reducing the noise
injected from V
frequency noise related to the GND. Connect a capacitor only to a “clean”
GND.
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 100 A current generator (I
the drain through the external resistor (R
given by the following equation:
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.
This pin is connected to the high-side MOSFET(s) gate.
Through this pin is supplied the high-side driver. Connect a capacitor from this
pin to the PHASE pin and a diode from V
BOOT).
This pin has to be connected closely to the low-side MOSFET(s) source in
order to reduce the noise injection into the device.
This pin is connected to the low-side MOSFET(s) gate.
5V internally regulated voltage. It is used to supply the internal drivers and as a
voltage reference. Filter it to ground with at least 1µF ceramic cap.
Supply voltage pin. The operative supply voltage range is from 4.5V to 14V.
This pin is an open collector output and it is pulled low if the output voltage is
not within the specified thresholds (90%-110%). If not used it may be left
floating. Pull-up this pin to V
CC
to the device, but can be a low impedance path for the high-
OCL
). The over-current threshold is given by the following
I
VALLEY
I
CCDR
PEAK
with a 10K resistor to obtain a logical signal.
I
OCH
I
R
2
OCL
OCL
DSonHS
OCH
R
CCDR
) from this pin to ground through the
DSonLS
R
). The over-current threshold is
R
OCH
OCL
to this pin (cathode versus
Pin connections and functions
OCH
) sinks a current from
9/50