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LM3248TMXNOPB Fiches technique(PDF) 2 Page - Texas Instruments |
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LM3248TMXNOPB Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 31 page SW_ BUCK OUT_ BOOST SW_ BOOST SW_ BOOST SW_ BOOST PVIN_ BOOST PVIN_ BOOST FB_ BUCK ENABLE ATB2 PVIN_ BUCK NC SW_ BUCK OUT_ BOOST PGND ACB DGND PVIN_ BUCK ATB1 ACB PGND SGND_ BUCK SGND_ BOOST BOOST_ GATE MODE VDD2_ BUCK VDD1_ BUCK BGND VCON VDD_ BOOST A B C D E F 1 2 3 4 5 LM3248 SNVSA01A – JULY 2013 – REVISED SEPTEMBER 2013 www.ti.com DESCRIPTION (CONTINUED) The LM3248 utilizes step-up (Boost) and variable output step-down (Buck) DC/DC converters. Combining a cascaded Boost and Buck converter in a single package is ideal for powering the latest multimode/multi-standard RF power amplifiers. The Boost converter provides the RF power subsystem the capability to operate at lower battery voltages as well as to maintain increased PA linearity and transmit power margins over a wider battery voltage supply range. The Buck has a unique Active Current assist and analog Bypass (ACB) feature to minimize inductor size without any loss of output regulation for the entire battery voltage and RF output power range, until dropout. ACB provides a parallel current path, when needed, to limit the maximum inductor current while still driving a 2.5A load. The LM3248 may also be configured as a Buck-only converter with a boost bypass feature to enable highest efficiency operation with minimal dropout voltage when the Boost is not needed. The LM3248 automatically and seamlessly transitions between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes for high-efficiency operation with both full and light load conditions. Connection Diagram Figure 1. 30-Bump Thin DSBGA Package (0.4 mm pitch) (Top View, bumps down) 2 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LM3248 |
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