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L6738ATR Datasheet(PDF) 9 Page - STMicroelectronics

Part # L6738ATR
Description  Embedded bootstrap diode
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6738ATR Datasheet(HTML) 9 Page - STMicroelectronics

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L6738A
Pin description and connection diagrams
Doc ID 18134 Rev 2
9/32
2
Pin description and connection diagrams
Figure 4.
Pin connection (top view)
2.1
Pin descriptions
1
2
3
VSEN
FBG
VCCDR
12
6
10
11
L6738A
LGATE
PHASE
CSN
7
5
16 15 14
BOOT
4
8
FB
9
13
Table 2.
Pin description
Pin#
Name
Function
1
VCCDR
Low side driver section power supply.
Operative voltage is 5 V to 12 V bus. Filter with 1
µF MLCC to GND.
2LGATE
Low-side driver output.
Connect directly to the low-side MOSFET gate. A small series resistor can be useful to
reduce dissipated power especially in high frequency applications.
3
PHASE
High-side driver return path.
Connect to the high-side MOSFET source. This pin is also monitored for the adaptive
dead-time management.
4BOOT
High-side driver supply.
This pin supplies the high-side floating driver. Connect through the CBOOT capacitor to the
PHASE pin. The pin is internally connected through a boot diode to the VCCDR pin. A
2.2Ohm series resistor is also provided. See Section 8 for guidance in designing the
capacitor value.
5UGATE
High-side driver output.
Connect to high-side MOSFET gate. A small series resistor may help in reducing the
PHASE pin negative spike as well as cooling the device.
6
PGOOD
Power Good.
It is an open-drain output set free after SS (with 3x clock cycle delay) as long as the out-
put voltage monitored through VSEN is within specifications. Pull-up to 3.3 V (typ) or
lower, if not used it can be left floating.
7EN
Enable Pin.
Pull-high to <5 V to enable conversion, 10
µA pull-down provided.


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