L6731B STMicroelectronics, L6731B Datasheet - Page 7

• Manufacturer Part Number: L6731B
• Description: IC CTRLR ADJ STPDN SYNC 16-TSSOP
• Manufacturer: STMicroelectronics

Specifications of L6731B

• Applications: Controller, DDR
• Voltage - Input: 1.8 ~ 14 V
• Number Of Outputs: 1
• Voltage - Output: Adjustable down to 0.6V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6731B
Table 3.
10
11
12
13
14
15
16
8
9
Pin functions
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 100µA (I
(R
Connecting a capacitor from this pin to GND helps in reducing the noise injected from
V
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 100µA current generator (I
external resistor (R
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
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. Filter it to
ground with at least 1µF ceramic cap.
Supply voltage pin. The operative supply voltage range is from 4.5V to 14V.
CC
OCL
to the device, but can be a low impedance path for the high-frequency noise
). The over-current threshold is given by the following equation:
OCH
). The over-current threshold is given by the following
OCL
I
VALLEY
I
) from this pin to ground through the external resistor
PEAK
OCH
CCDR
) sinks a current from the drain through the
=
=
to this pin (cathode versus BOOT).
I
---------------------------------
OCH
-------------------------------- -
2
R
I
OCL
DSONHS
R
DSONLS
R
OCH
I
OCL
Pin connections and functions
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