L6728D STMicroelectronics, L6728D Datasheet - Page 29

• 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
13.1
13.1.1
13.1.2
13.1.3
13.1.4
Board description
Power input (Vin)
This is the input voltage for the power conversion. The high-side drain is connected to this
input. This voltage can range from 1.5 V to 12 V bus.
If the voltage is between 4.5 V and 12 V, it can also supply the device (through the Vcc pin),
and in this case the R16 (0 Ω) resistor must be present.
Output (Vout)
The output voltage is fixed at 1.25 V, but can be changed by replacing resistors R8 (sense
partition lower resistor) and R13 (feedback partition lower resistor). R18 allows the
adjustment of the OCP threshold.
Signal input (Vcc)
When using the input voltage Vin to supply the controller, no power is required at this input.
However, the controller can be supplied separately from the power stage through the Vcc
input (4.5-12 V) and, in this case, the R16 (0 Ω) resistor must be unsoldered.
Test points
Several test points are provided for easy access to all the important signals that characterize
the device:
–
–
–
–
–
–
–
COMP: The output of the error amplifier
FB: The inverting input of the error amplifier
PGOOD: Signaling regular functioning (active high)
VGDHS: The bootstrap diode anode
PHASE: Phase node
LGATE: Low-side gate pin of the device
HGATE: High-side gate pin of the device
Doc ID 16498 Rev 1
5 A demonstration board
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