Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3248 Datenblatt(PDF) 3 Page - Texas Instruments |
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LM3248 Datenblatt(HTML) 3 Page - Texas Instruments |
3 / 31 page LM3248 www.ti.com SNVSA01A – JULY 2013 – REVISED SEPTEMBER 2013 Pin Descriptions Pin # Name I/O Description A1 VDD_BOOST - Power supply voltage input for Boost Analog blocks. Connected to VBATT supply. A2 PVIN_BOOST - Power supply voltage input for Boost Bypass FET. A3 A4 Boost converter output. When Boost and Buck are active, OUT_BOOST must be externally connected to PVIN_BUCK. A 10 µF capacitor must be placed between this node and GND. OUT_BOOST O Internally connected to BUCK voltage input and feedback to inverting input of Boost error A5 amplifier. Digital input. A Low-to-High transition wakes up the boost converter and positions it to a high B1 BOOST_GATE I level in preparation for a possible VCON change. B2 SGND_BOOST - Analog Ground for the Boost Analog blocks. B3 Boost converter switch node. When Boost and Buck are active, SW_BOOST is typically B4 SW_BOOST I/O connected to VBATT supply through external power inductor. B5 C1 MODE I Digital input. Low = 3G/4G (PWM/PFM) operation; High = 2G (PWM only) operation. Power supply voltage input for Buck Analog PWM blocks. Internally connected to PVIN_BUCK C2 VDD1_BUCK when used with Boost. If Buck-only mode is used then must be directly connected to VBATT supply. C3 SGND_BUCK - Analog Ground for the Buck Analog Blocks. C4 PGND - Power Ground for output FETs. C5 Input. Chip enable. Setting ENABLE = High biases up the Buck and initiates VCON regulation D1 ENABLE I by the Buck. D2 VCON I Analog voltage control input which controls Buck output voltage. D3 NC - No connect; leave this pin floating. D4 SW_BUCK O Buck converter switch node for external filter inductor connection. D5 E1 ATB1 - Test pin. Connect to SGND or System Ground. Feedback input to inverting input of error amplifier. Connect Buck output voltage directly to this E2 FB_BUCK - node. E3 DGND - Ground for Boost, Buck, and RFFE digital blocks. E4 Power supply input for Buck PFET and ACB FET. A 10 µF capacitor must be placed between PVIN_BUCK - this node and PGND. Must be externally connected to OUT_BOOST. E5 F1 ATB2 - Test pin. Connect to SGND or System Ground. Power supply voltage input for Buck Analog PWM blocks. Internally connected to PVIN_BUCK F2 VDD2_BUCK - when used with Boost. F3 BGND - Ground for ACB bypass circuit. F4 Active Current assist and Bypass output. Connected to the Buck converter output filter ACB - capacitor. F5 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3248 |
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