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LM26480SQ-AA_NOPB Scheda tecnica(PDF) 4 Page - Texas Instruments |
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LM26480SQ-AA_NOPB Scheda tecnica(HTML) 4 Page - Texas Instruments |
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4 / 37 page  7 8 9 10 11 12 21 20 19 24 23 22 1 2 3 4 5 6 13 14 18 17 16 15 LM26480 SNVS543I – JANUARY 2008 – REVISED MAY 2013 www.ti.com Connection Diagram Figure 2. 24-Lead WQFN Package (top view) Table 1. Default Options Oscillator Order Suffix Spec Buck Modes nPOR Delay UVLO Sync AECQ Frequency SQ-AA NOPB 2.0 MHz Auto-Mode 60 mS Enabled Disabled No QSQ-AA NOPB 2.0 MHz Auto-Mode 60 mS Enabled Disabled Grade 1 QSQ-CF NOPB 2.1 MHz Forced PWM 60 mS Disabled Disabled Grade 1 SQ-BF NOPB 2.0 MHz Forced PWM 60 mS Enabled Enabled No QSQ-8D NOPB 2.1 MHz Forced PWM 130 µS Enabled Disabled Grade 1 Table 2. PIN DESCRIPTIONS(1) WQFN Pin Name I/O Type Description No. 1 VINLDO12 I PWR Analog Power for Internal Functions (VREF, BIAS, I2C, Logic) 2 SYNC I G/(D) Frequency Synchronization pin which allows the user to connect an external clock signal to synchronize the PMIC internal oscillator. Default OFF and must be grounded when not used. Part number LM26480SQ-BF has this feature enabled. Please contact Texas Instruments Sales Office/Distributors for availability of LM26480SQ-BF. 3 NPOR O D nPOR Power on reset pin for both Buck1 and Buck 2. Open drain logic output 100K pullup resistor. nPOR is pulled to ground when the voltages on these supplies are not good. See Flexible Power-On Reset (i.e., Power Good with Delay) section for more info. 4 GND_SW1 G G Buck1 NMOS Power Ground 5 SW1 O PWR Buck1 switcher output pin 6 VIN1 I PWR Power in from either DC source or Battery to Buck1 7 ENSW1 I D Enable Pin for Buck1 switcher, a logic HIGH enables Buck1. Pin cannot be left floating. 8 FB1 I A Buck1 input feedback terminal 9 GND_C G G Non-switching core ground pin 10 AVDD I PWR Analog Power for Buck converters 11 FB2 I A Buck2 input feedback terminal 12 ENSW2 I D Enable Pin for Buck2 switcher, a logic HIGH enables Buck2. Pin cannot be left floating. 13 VIN2 I PWR Power in from either DC source or Battery to Buck2 (1) A: Analog Pin D: Digital Pin G: Ground Pin PWR: Power Pin I: Input Pin I/O: Input/Output Pin O: Output Pin 4 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM26480 |
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