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05-18-2011

Ultra-Small, 500mA Dual POL Regulator from Semtech Replaces LDOs with Higher Efficiency Alternative

Semtech » SC197

SC197 saves space in tiny 2 x 3 x 0.6mm package, with compact 80mm² footprint and 94% efficiency

Semtech Corp. launched the latest device in its buck regulator platform. The new SC197 is a 500mA, dual-output, point-of-load (POL) regulator, combining two PWM DC-DC regulators in an ultra-small, low-profile 2 × 3 × 0.6mm package with an overall design solution footprint of just 80mm2. The small size and footprint of the SC197 help designers save significant board space versus using two single-channel switchers and power efficiency up to 94% makes the device a higher efficiency alternative to LDOs. The SC197 is ideal for power management applications in portable equipment, as well as in lower-voltage, multi-rail power supply designs.

Semtech - SC197

In addition to the two on-chip regulators, the SC197 features integrated 4-bit VID pins to provide dynamic voltage scaling (DVS), without the need for external programming resistors. Also, on-chip loop compensation eliminates the need for stability control components and a 3.5MHz fixed PWM switching frequency operation balances high efficiency and fast transient response, while enabling the SC197 to work with very small chip inductors. In typical designs, each regulator requires only two capacitors and a single inductor. This unique combination of high integration, tiny package, and low external parts count enables the small, 80mm2 footprint of the SC197.

Both regulators in the SC197 operate from inputs of 2.9V to 5.5V and provide 15 pin-programmable output voltages from 0.8V to 3.3V, covering all the typical core and I/O voltage rails with one device. An automatic power-save (PSAVE) mode reduces quiescent current to 38μA (typical) per regulator to maintain high efficiency during light loads.

The SC197 offers full protection features, including internal soft-start to minimize inrush current; input under-voltage lockout; output over-voltage and current-limit protection; foldback current limit, short-circuit protection; and over-temperature protection. 100% duty-cycle operation is also supported for applications with low headroom between input and output.

Key Features of the SC197

  • VIN: 2.9V to 5.5V; VOUT: pin-programmable 0.8V to 3.3V
  • Two channels: 500mA output current per channel
  • Ultra-small, low-profile 18-pad MLPQ package – 2 × 3 × 0.6mm
  • Works with very small chip inductors for ultra-compact 80mm2 solution footprint
  • Integrated VID pins for dynamic voltage scaling, no need for external feedback resistors
  • 3.5MHz switching frequency
  • Efficiency up to 94%
  • Fast transient response

Applications

The space-saving, high efficiency and DVS features of the SC197 make it ideal for portable equipment applications, including medical and personal navigation devices; POS terminals; and portable games. It can also be used to manage 3.3V to 5V internal power rails in embedded applications for networking, communications, industrial, and office automation equipment.

Typical Application Circuit

Typical SC197 Application Circuit

Pricing and Availability

The SC197 is available immediately in production quantities and is priced at $0.98 each in 3,000-piece lots. The ordering code is SC197ULTRT. Evaluation boards (SC197EVB) are also available. Semtech offers comprehensive design assistance, including field- and factory-based support.

semtech.com

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