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L6725：Voltage mode PWM controller with bootstrap anti-discharging system

The device is a flexible high performance PWM buck controller dedicated for low voltage distributed DC-DC. The input voltage can range from 1.8V to 18V, while the supply voltage can range from 4.5V to 18V. The output voltage is adjustable down to 0.6V.

High peak current gate drivers provide for fast switching to the external power section, and the output current can be in excess of 20A. The device is capable to manage minimum on-times (T_ON) shorter than 100ns making possible conversions with very low duty cycle and very high switching frequency. In order to guarantee a real overcurrent protection, also with very narrow T_ON, the current sense is realized both on the high-side and low-side MOSFETs. When necessary, two different current limit protections can be externally set through an external resistor. The device can sink current after the soft-start phase while, during the soft-start, the sink mode capability is disabled in order to allow a proper start-up also in pre-biased output voltage conditions. Other features are over-voltage-protection and thermal shutdown.

Key Features

• Predictive anti-cross conduction control
• High current embedded drivers
• Sink current capability
• Programmable high-side and low-side RDS(on) sense over-current-protection
• Pre-bias start up capability
• Selectable switching frequency 250KHz/500KHz
• Thermal shut-down
• Over voltage protection
• Package: SO16N
• Soft-start and inhibit
• External input voltage reference
• Input voltage range from 1.8V to 18V
• Adjustable output voltage down to 0.6V with ±0.8% accuracy over line voltage and temperature (0˚C~125˚C)
• Supply voltage range from 4.5V to 18V
• 0% to 100% duty cycle
• Bootstrap anti-discharging system
• Fixed frequency voltage mode control

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Application Notes

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