A6727 STMicroelectronics

A6727 Single-phase PWM controller for automotive applications Datasheet - production data complete control logic, protection and reference voltage to realize a general DC-DC converter by using a compact SO-8 package. The device flexibility allows the management of conversions with power input V as low as 1.5 V and device IN supply voltage in the range of 5 V to 12 V. The A6727 provides simple control loop with SO-8 voltage mode error-amplifier. The integrated 0.8 V reference allows the regulation of output voltages with 1% accuracy over line and temperature variations. The oscillator is internally fixed to 300 Features kHz. AEC-Q100 compliant The A6727 provides programmable overcurrent Flexible power supply from 5 V to 12 V protection as well as over and undervoltage Power conversion input as low as 1.5 V protection. The current information is monitored across the low-side MOSFET R saving the DS(on) 1% output voltage accuracy use of expensive and space-consuming sense High-current integrated drivers resistors while output voltage is monitored Adjustable output voltage through FB pin. 0.8 V internal reference FB disconnection protection prevents excessive and dangerous output voltages from floating FB Simple voltage mode control loop pin. Sensorless and programmable OCP across Low-side R DS(on) Table 1. Device summary Oscillator internally fixed at 300 kHz Order code Package Packaging Internal soft-start A6727 Tube LS-less to manage pre-bias startup SO-8 A6727TR Tape and reel Disable function OV/UV protection FB disconnection protection SO-8 package Applications Dedicated to automotive applications Description The A6727 is a single-phase step-down controller with integrated high-current drivers that provides July 2013 DocID025003 Rev 1 1/29 This is information on a product in full production. www.st.com 29Contents A6727 Contents 1 Typical application circuit and block diagram 4 1.1 Application circuit 4 1.2 Block diagram . 4 2 Pin description and connection diagram 5 2.1 Pin description 5 2.2 Thermal data . 6 3 Electrical specifications 6 3.1 Absolute maximum ratings . 6 3.2 Electrical characteristics . 7 4 Device description 9 5 Driver section . 10 5.1 Power dissipation . 10 6 Soft-start and disable . 12 6.1 Low-side-less startup (LS-less) 12 6.2 Enable / disable 13 7 Overcurrent protection 14 7.1 Overcurrent threshold setting 14 8 Output voltage monitor and protections 15 8.1 Undervoltage protection 15 8.2 Overvoltage protection . 15 8.3 Feedback disconnection protection . 15 8.4 Undervoltage lock out 15 9 Application details . 16 9.1 Output voltage selection 16 9.2 Compensation network . 16 2/29 DocID025003 Rev 1