L6728TR STMicroelectronics, L6728TR Datasheet - Page 18

IC PWM CTLR 1PH PWRGOOD 10DFN

L6728TR

Manufacturer Part Number
L6728TR
Description
IC PWM CTLR 1PH PWRGOOD 10DFN
Manufacturer
STMicroelectronics
Datasheet

Specifications of L6728TR

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
330kHz
Duty Cycle
80%
Voltage - Supply
4.5 V ~ 12 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
10-DFN
Frequency-max
330kHz
Output Voltage
0.8 V
Output Current
30 A
Input Voltage
1.5 V to 13.2 V
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
For Use With
497-8228 - BOARD EVALUATION W/L6728497-6418 - BOARD EVAL BASED ON L6728
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6274-2

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Quantity
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Part Number:
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Application details
18/31
Figure 7.
Gate traces and phase trace must be sized according to the driver RMS current delivered to
the power MOSFET. The device robustness allows managing applications with the power
section far from the controller without losing performances. Anyway, when possible, it is
recommended to minimize the distance between controller and power section.
Small signal components and connections to critical nodes of the application, as well as
bypass capacitors for the device supply, are also important. Locate bypass capacitor (VCC
and Bootstrap capacitor) and feedback compensation components as close to the device as
practical. For over current programmability, place R
leakage current paths on LGATE / OC pin, since the internal current source is only 10 μA.
Systems that do not use Schottky diode in parallel to the low-side MOSFET might show big
negative spikes on the phase pin. This spike must be limited within the absolute maximum
ratings (for example, adding a gate resistor in series to HS MOSFET gate), as well as the
positive spike, but has an additional consequence: it causes the bootstrap capacitor to be
over-charged. This extra-charge can cause, in the worst case condition of maximum input
voltage and during particular transients, that boot-to-phase voltage overcomes the absolute
maximum ratings also causing device failures. It is then suggested in this cases to limit this
extra-charge by adding a small resistor in series to the bootstrap diode.
Figure 8.
LS DRIVER
LGATE
GND
VCC
Power connections (heavy lines)
Drivers turn-on and turn-off paths
L6728
R
UGATE
GATE
PHASE
LGATE
GND
LS MOSFET
R
INT
C
GS
C
GD
C
DS
C
V
IN
IN
L
HS DRIVER
OCSET
C
OUT
close to the device and avoid
PHASE
BOOT
UGATE
LOAD
R
GATE
HS MOSFET
R
INT
C
GS
C
GD
L6728
C
DS

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