PRODUCT SUMMARY Q845: Ultra-Fast Boosting Power Supply for 3G/4G/LTE PA Envelope Tracking Applications Smartphones, tablets, data cards, mobile hotspots, and other mobile devices that feature high-speed data VBAT R99, HSPA, HSPA+, LTE 5 MHz, 10 MHz, and 20 MHz Features VBAT Ultra-fast low-noise power supply for 3G/4G/LTE ET PAs: 85% ET efficiency for 4G/LTE, 93% APT efficiency Supports up to LTE20 (100 RB) No digital predistortion (DPD) required from 1 to 100 RB Dynamic PA VCC voltage boost above VBAT 20 nV/Hz output noise floor 2.7 V to 5.25 VDC input voltage range Flexible, low overhead, MIPI digital and analog control: MIPI RFFE digital interface compliant MIPI eTrak analog control interface compliant High-speed ET/APT transitions with only 1 RFFE write ® Cost-effective and low-area CSP package: 2.43 mm x 1.79 mm x 0.61 mm, 24-pin package 6 passive components for ET/APT Seven modes of operation: ET, APT, Bypass, Standby, Sleep, Deep Sleep, Shutdown Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04–0074. 3 VIO MIPI Control Interface SDATA VIN+ VIN+ VOUT3 VIN– VIN– VPA VOUT1 SCLK GND Y2126 Figure 1. Functional Block Diagram of the Q845 Description The Q845 ultra-fast power supply is designed for envelope tracking (ET) for 3G/4G/LTE RF PAs. It also supports average power tracking (APT). Using patented qBoostTM technology, the Q845 simultaneously combines the high efficiency of a switching power supply with the responsiveness and low noise of a linear power supply. An innovative combining network optimizes the blend of these supply technologies and also enables the Q845 to dynamically boost its output voltage above its input voltage to track modulation peaks. With this approach, the Q845 provides an efficient PA supply voltage with a slew rate up to 100V/s, continuously adjusting the PA supply voltage to precisely track the modulation envelope, thus maximizing PA efficiency and peak power. This performance is achieved while still meeting ACLR, EVM, and Receive Band noise specifications. Where APT is adequate in the mid-power range of the PA, the Q845 seamlessly transitions between ET and APT as needed. Figure 1 shows a functional block diagram. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203590A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 30, 2015 1 PRODUCT SUMMARY • Q845 ULTRA-FAST BOOSTING POWER SUPPLY FOR PA ENVELOPE TRACKING Ordering Information Model Name Q845: Ultra-Fast Boosting Power Supply for 3G/4G/LTE PA Envelope Tracking Manufacturing Part Number Q845 B3EBD-T Evaluation Board Part Number Q845EK1 Copyright © 2015 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 June 30, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203590A