Datasheet

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
GND VCC OSC
UGATE PGOOD EN
BOOT
4
COMP
8
FB
9
13
CSP
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 1µF 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 C
BOOT
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.