Details

Autor(en) / Beteiligte

• Schrom, G.
• Hazucha, P.
• Hahn, J.
• Gardner, D.S.
• Bloechel, B.A.
• Dermer, G.
• Narendra, S.G.
• Karnik, T.
• De, V.

Titel

A 480-MHz, multi-phase interleaved buck DC-DC converter with hysteretic control

Ist Teil von

• 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551), 2004, Vol.6, p.4702-4707 Vol.6

Ort / Verlag

Piscataway NJ: IEEE

Erscheinungsjahr

2004

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• We propose an on-chip 1.8 V-to-0.9 V DC-DC converter aimed to reduce the input current and decoupling requirements of future microprocessors. By utilizing a 90-nm CMOS process, employing a four-phase hysteretic control, and operating at ultra-high frequency of 480-MHz, we achieved a 10% output droop with only 2.5 nF of on-chip decoupling, for 0.5 A of load current. No off-chip decoupling was connected to the output. At 480 MHz the measured efficiency was 72%. At 250 MHz, the efficiency improved to 76% at the cost of a 17% droop or larger decoupling of 11.5 nF. A converter with 100 A rating would require a capacitor of 0.5 /spl mu/F, which is comparable to the size of an on-chip capacitor of a typical microprocessor.