L6728D STMicroelectronics, L6728D Datasheet - Page 5

• Manufacturer Part Number: L6728D
• Description: IC CTLR PWM 1PH POWERGOOD 10DFN
• Manufacturer: STMicroelectronics

Specifications of L6728D

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 330kHz
• Duty Cycle: 80%
• Voltage - Supply: 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6728D
2
2.1
Table 2.
Pin n°
10
1
2
3
4
5
6
7
8
9
COMP / DIS
LGATE / OC
PGOOD
PHASE
UGATE
Name
BOOT
VSEN
GND
VCC
FB
Pin description and connection diagram
Pin descriptions
Pins description
Figure 3.
HS driver supply. Connect through a capacitor (100 nF) to the floating node (LS-Drain) pin
and provide necessary bootstrap diode from VCC.
HS driver return path, current-reading and adaptive-dead-time monitor. Connect to the LS
drain to sense
adaptive-dead-time control circuitry to monitor when HS MOSFET is OFF.
HS driver output. Connect directly to HS MOSFET gate.
LGATE: LS driver output. Connect directly to LS MOSFET gate. OC: Overcurrent threshold
set. During a short period of time following VCC rising over the UVLO threshold, a 10 μA
current is sourced from this pin. Connect to GND with an R
program the OC threshold. The resulting voltage at this pin is sampled and held internally as
the OC set point. The maximum programmable OC threshold is 0.55 V. A voltage greater than
0.6 V activates an internal clamp and causes the OC threshold to be set at the maximum
value.
All internal references, logic and drivers are connected to this pin. Connect to the PCB ground
plane.
Device and driver power supply. Operating range from 5 V to 12 V. Filter with at least 1 µF
MLCC to GND.
COMP: Error amplifier output. Connect with an R
control loop. DIS: The device can be disabled by pushing this pin lower than 0.75 V (typ). By
setting the pin free, the device is enabled again.
Error amplifier inverting input. Connect with a resistor R
output resistor divider may be used to regulate voltages higher than the reference.
Regulated voltage sense pin for OVP and UVP protection and PGOOD. Connect to the output
regulated voltage, or to the output resistor divider if the regulated voltage is higher than the
reference.
Open drain output set free after SS has finished and pulled low when VSEN is outside the
relative window. Pull up to a voltage equal or lower than VCC. If not used it can be left
floating.
Pin connection (top view)
R
DS(on)
drop to measure the output current. This pin is also used by the
Doc ID 16498 Rev 1
L6728D
Function
Pin description and connection diagram
F
- C
F
FB
// C
OCSET
to the output regulated voltage. An
P
to FB to compensate the device
resistor greater than 5 kΩ to
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