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PM6675STR Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6675STR Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 53 page  February 2008 Rev 1 1/53 PM6675S High efficiency step-down controller with embedded 2 A LDO regulator Features ■ Switching section – 4.5 V to 28 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 ■ Notebook computers ■ Graphic cards ■ Embedded computers Description The PM6675S 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. A 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 limits (±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 www.st.com Table 1. Device summary Order codes Package Packaging PM6675S VFQFPN-24 4x4 (exposed pad) Tube PM6675STR Tape and reel |
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Similar Description - PM6675STR |
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