STEVAL-ISA038V1 STMicroelectronics, STEVAL-ISA038V1 Datasheet - Page 9

• Manufacturer Part Number: STEVAL-ISA038V1
• Description: BOARD EVALUATION W/L6728
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA038V1

• Design Resources: STEVAL-ISA038V1 Schematic STEVAL-ISA038V1 Bill of Material
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.25V
• Current - Output: 5A
• Voltage - Input: 5 ~ 12V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6728
• Input Voltage: 5 V to 12 V
• Output Voltage: 1.25 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6728D
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Step Down DC/DC Controller
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6728
• Other names: 497-8228; STEVAL-ISA038V1

L6728
5
Device description
L6728 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.
L6728 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 8 V/µs slew rate, allowing high
regulator bandwidth for fast transient response.
To avoid load damages, L6728 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.
L6728 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.
L6728 is available in a compact DFN10 3x3 mm package with exposed pad.
DS(on)
, saving the use of expensive and space-
Device description
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