Intersil Debuts ISL6402/ISL6402A DC-DC Converters

Intersil Corp. (Milpitas, CA) announced its new ISL6402 and ISL6402A dc-dc converters that contain two synchronous-buck, pulse-width modulated (PWM) controllers and a linear regulator in a small near-chip-scale, thermally enhanced, 28-pad, quad flat no-lead (QFN) package and the 28-lead TSSOP package. The ISL6402 is efficiency-optimized for a wide range of applications while the ISL6402A is designed for xDSL customer premises equipment (CPE) compatibility.

The two PWM converters in each IC operate 180° out of phase to reduce input ripple voltage, EMI and total RMS input current. Both PWMs have independent enable/soft-start pins to facilitate power sequencing in the applications. Operating over a wide 4.5 V to 24 V supply range, each output is adjustable down to 0.8 V. An internal low dropout linear regulator eliminates the need for an additional 5 V bias. The linear controller uses an external pass transistor to accommodate high output current without dissipating heat inside the IC.

The ISL6402 PWMs switch at 300 kHz, which makes them suitable for applications that require multiple low-noise rails and high power efficiency. The 1.4 MHz switching frequency of the ISL6402A places switching noise above the typical 1.1 MHz ADSL band and provides a fast transient response, making it suitable for DSL CPE applications while enabling the use of smaller external components. Both of these triple regulator ICs incorporate many robust protection features such as adjustable over-current protection, hiccup-mode over-current protection for output over-load/short-circuit conditions, and thermal shutdown if the junction temperature exceeds +150 °C.

The suggested resale price in 100-unit to 999-unit quantities is $3 each for either part in either package.