L6728A STMicroelectronics, L6728A Datasheet - Page 9

• Manufacturer Part Number: L6728A
• Description: Voltage Mode PWM Controllers Hi-Freq. singl-phase PWM controller w/Po
• Manufacturer: STMicroelectronics

Specifications of L6728A

• Number Of Outputs: Dual Output
• Topology: Buck
• Output Voltage: 0.8 V
• Output Current: 1500 mA
• Switching Frequency: 660 KHz
• Duty Cycle (max): 67 %
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Package / Case: VFDFPN-10 EP
• Synchronous Pin: No
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6728A
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Device description
L6728A is a single-phase PWM controller with embedded high-current drivers that provides
complete control logic and protections to realize in an easy and simple way a general DC-
DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck
topology, with its high level of integration this 10-pin device allows reducing cost and size of
the power supply solution also providing real-time PGOOD in a compact
VFQFPN10 3x3 mm.
L6728A is designed to operate from a 5 V or 12 V supply. The output voltage can be
precisely regulated to as low as 0.8 V with ±1 % accuracy over line and temperature
variations. The switching frequency is internally set to 600 kHz.
This device provides a simple control loop with a voltage-mode error-amplifier. The error-
amplifier features a 15 MHz gain-bandwidth product and 8 V/µs slew rate, allowing high
regulator bandwidth for fast transient response.
To avoid load damages, L6728A provides over-current protection as well as overvoltage,
under voltage and feedback disconnection protection. The over-current trip threshold is
programmable by a simple resistor connected from Lgate to GND. Output current is
monitored across low-side MOSFET R
consuming sense resistor. Output voltage is monitored through dedicated VSEN pin.
L6728A implements soft-start increasing the internal reference in closed loop regulation.
low-side-less feature allows the device to perform soft-start over pre-biased output avoiding
high current return through the output inductor and dangerous negative spike at the load
side.
L6728A is available in a compact VFDFN10 3 x 3 mm package with exposed pad.
DS(on)
, saving the use of expensive and space-
Device description
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