L6727 STMicroelectronics, L6727 Datasheet - Page 9

• Manufacturer Part Number: L6727
• Description: IC PWM CTLR SGL PHASE SO-8
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L6727

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 0.8V
• Frequency - Switching: 300kHz
• Voltage - Input: 1.5 ~ 12 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Current: 1.5 A
• Input Voltage: - 0.3 V to + 15 V
• Switching Frequency: 300 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 80 %
• For Use With: 497-8266 - BOARD EVAL BASED ON L6727497-6258 - BOARD EVAL 1PH STPDWN CONV L6727
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6727
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Device description
L6727 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 8-pin device allows reducing cost and size of
the power supply solution.
L6727 is designed to operate from a 5 V or 12 V supply bus. Thanks to the high precision
0.8V internal reference, the output voltage can be precisely regulated to as low as 0.8 V with
±1 % accuracy over line and temperature variations (between 0 °C and +70 °C).
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, L6727 provides over current protection as well as over voltage,
under voltage and feedback disconnection protection. When the device is supplied from 5 V,
over current trip threshold is programmable by a simple resistor. Output current is monitored
across Low-side MOSFET R
resistor. Output voltage and feedback disconnection are monitored through FB pin.
L6727 implements soft-start increasing the internal reference from 0 V to 0.8 V in 5.1 ms
(typ) 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.
dsON
Doc ID 12933 Rev 4
, saving the use of expensive and space-consuming sense
Device description
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