SKY87202-11-631LF

PRODUCT SUMMARY SKY87202: 3.5 A Constant On-Time, Step-Down DC-DC Converter Applications Description  Portable devices The SKY87202 is a 1.2 MHz, 3.5 A constant on-time, synchronous step-down DC-DC converter. The device provides an output voltage from 0.6 V to 3.3 V from input voltage ranging from 2.7 V to 6.0 V, while keeping excellent line and load regulation and maximizing input efficiency.  Access points  Set top boxes The constant on-time control allows easy loop stabilization with minimal external components while providing fast transient response. Features  Input voltage range: 2.7 V to 6.0 V  Two output voltage options:  Adjustable output voltage: 0.6 V to 3.3 V (SKY87202-11)  Fixed output voltage: 1.2 V (SKY87202-12) Power sequencing is controlled by the EN and PG pins.  Up to 3.5 A continuous output current The SKY87202 is available in a 12-pin, 2 mm  2 mm Quad Flat No-Lead (QFN) package.  Switching frequency: 1.2 MHz  95% peak efficiency  Typical switch on resistance: 50 m PMOS, 40 m NMOS  80% light load efficiency The SKY87202 has cycle-by-cycle current limits and thermal shutdown to protect against fault conditions. A typical application circuit is shown in Figure 1. The pin configuration and packages are shown in Figure 2. A functional block diagram of the SKY87202 is shown in Figure 3.  Power sequencing  Cycle-by-cycle over-current protection Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074.  Over-temperature protection  Control loop stabilization with low ESR ceramic capacitors  Soft start  Low profile, QFN (12-pin, 2 mm  2 mm) package (MSL1, 260 C per JEDEC J-STD-020) SKY87202 1 C1 22 μF 10 PVIN VIN 8 EN Power Good 9 PG AGND Enable 4 LX OUT FB/NC NC 2, 11 1 μH L1 C2 22 μF 6 R1 57.6 kΩ R2 57.6 kΩ Output Voltage 1.2 V 7 5 × PGND Input Voltage 2.7 V to 6 V 3, 12 t0281 Figure 1. Typical Application Circuit Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 203141A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 27, 2014 1 VIN PRODUCT SUMMARY • SKY87202 STEP-DOWN DC-DC CONVERTER PVIN 1 10 9 PG LX LX 2 11 8 EN PGND 12 7 FB/NC AGND 4 5 6 OUT NC PGND 3 S3184 Figure 2. SKY87202-11/-12 Pinout – 12-Pin QFN Packages (Top View) VIN Current Limit Comparator Voltage References and UVLO EN – VREF + FB/NC PVIN + HSG + COMP – PWM Control and Logic Ramp Circuit HS MOSFET Driver SW OUT LX RDAMP VOUT Discharge 200 kΩ LSG LS MOSFET Internal FB for fixed output voltage 200 kΩ – + fSET 0.66 V + PGND Discontinuous Conduction Mode Comparator – + 0.54 V PG – t0279 Figure 3. SKY87202 Functional Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 February 27, 2014 • Skyworks Proprietary and Confidential information • Products and Product Information Are Subject To Change Without Notice • 203141A # PRODUCT SUMMARY • SKY87202 STEP-DOWN DC-DC CONVERTER Ordering Information Model Name SKY87202 step-down DC-DC converter Manufacturing Part Number Evaluation Board Part Number SKY87202-11-631LF (variable output voltage) SKY87202-11-631LF-EVB SKY87202-12-631LF (fixed 1.2 V output voltage) SKY87202-12-631LF-EVB Copyright © 2012-2014 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. 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