L6728H STMicroelectronics, L6728H Datasheet - Page 9

• Manufacturer Part Number: L6728H
• Description: Voltage Mode PWM Controllers Sgl Output 300 KHz DFN-10
• Manufacturer: STMicroelectronics

Specifications of L6728H

• Number Of Outputs: Single Output
• Switching Frequency: 300 KHz
• Operating Supply Voltage: 5 V to 12 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: DFN-10
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6728H
5
Device description
L6728H 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 DFN10 3x3 mm.
L6728H 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 ±0.8% accuracy over line and temperature
variations. The switching frequency is internally set to 300 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 8V/µs slew rate, allowing high
regulator bandwidth for fast transient response.
To avoid load damages, L6728H provides over current protection as well as over voltage,
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.
L6728H 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.
L6728H is available in a compact DFN10 3x3 mm package with exposed pad.
Doc ID 15725 Rev 1
DS(on)
, saving the use of expensive and space-
Device description
9/32