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PM6675AS Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6675AS Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 48 page  February 2008 Rev 1 1/48 PM6675AS High efficiency step-down controller with embedded 2 A LDO regulator Features ■ Switching section – 4.5 V to 36 V input voltage range – 0.6 V, ±1 % voltage reference – Selectable 1.5 V fixed output voltage – Adjustable 0.6 V to 3.3 V output voltage – 1.237 V ±1 % reference voltage available – Very fast load transient response using constant-on-time control loop –No RSENSE current sensing using low side MOSFETs' RDS(ON) – Negative current limit – Latched OVP and UVP – Soft-start internally fixed at 3 ms – Selectable pulse skipping at light load – Selectable No-audible (33 kHz) pulse skip mode – Ceramic output capacitors supported – Output voltage ripple compensation – Output soft-end ■ LDO regulator section – Adjustable 0.6 V to 3.3 V output voltage – Selectable ±1 Apk or ±2 Apk current limit – Dedicated power-good signal – Ceramic output capacitors supported – Output soft-end Applications ■ Industrial application on 24 V ■ Graphic cards ■ Embedded computer systems Description The PM6675AS device consists of a single high efficiency step-down controller and an independent low drop-out (LDO) linear regulator. The constant on-time (COT) architecture assures fast transient response supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. Selectable low-consumption mode allows the highest efficiency over a wide range of load conditions. The low-noise mode sets the minimum switching frequency to 33 kHz for audio-sensitive applications. The LDO linear regulator can sink and source up to 2 Apk. Two fixed current limit (±1 A- ±2 A) can be chosen. An active soft-end is independently performed on both the switching and the linear regulators outputs when disabled. VFQFPN-24 4x4 Table 1. Device summary Order codes Package Packaging PM6675AS VFQFPN-24 4x4 (exposed pad) Tube PM6675ASTR Tape and reel www.st.com |
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