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BQ51221 Datasheet(PDF) 5 Page - Texas Instruments |
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BQ51221 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 50 page  6 Pin Configuration and Functions 1 2 3 4 A B C D E F G Not to scale PGND PGND PGND PGND AC2 AC2 AC1 AC1 BOOT2 RECT RECT BOOT1 OUT OUT OUT OUT COMM2 CLAMP2 CLAMP1 COMM1 TS/CTRL FOD AD-EN CHG ILIM EN2 EN1 AD Figure 6-1. YFP Package 28-Pin DSBGA Top View Thermal Pad 2 AC1 3 BOOT1 4 OUT 5 CLAMP1 6 COMM1 7 CHG 8 AD-EN 9 AD 12 ILIM 13 TS/CTRL 14 FOD 15 COMM2 16 CLAMP2 17 BOOT2 18 RECT 19 AC2 Not to scale The exposed thermal pad should be connected to ground. Figure 6-2. RHL Package 20-Pin VQFN Top View Pin Functions PIN I/O DESCRIPTION NAME YFP RHL AC1 B3, B4 2 I AC input from receiver coil. AC2 B1, B2 19 I AD G4 9 I If AD functionality is used, connect this pin to the wired adapter input. When VAD-Pres is applied to this pin wireless charging is disabled and AD_EN is driven low. Connect a 1-µF capacitor from AD to PGND. If unused, the capacitor is not required and AD should be connected directly to PGND. AD-EN F3 8 O Push-pull driver for external PFET when wired charging is active. Float if not used. BOOT1 C4 3 O Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10-nF ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2. BOOT2 C1 17 O CHG F4 7 O Open-drain output – active when OUT is enabled. Float or tie to PGND if unused. CLAMP2 E2 16 O Open-drain FETs which are used for a non-power dissipative overvoltage AC clamp protection. When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will act as a low impedance to protect the device from damage. If used, capacitors are used to connect CLAMP1 to AC1 and CLAMP2 to AC2. Recommended connections are 0.47-µF capacitors. CLAMP1 E3 5 O COMM1 E4 6 O Open-drain outputs used to communicate with primary by varying reflected impedance. Connect a capacitor from COMM1 to AC1 and a capacitor from COMM2 to AC2 for capacitive load modulation. For resistive modulation connect COMM1 and COMM2 to RECT through a single resistor. See Section 8.3.10 for more information. COMM2 E1 15 O EN1 G3 10 I Inputs that allow user to enable and disable wireless and wired charging <EN1 EN2>: <00> Wireless charging is enabled unless AD voltage > VAD_Pres. <01> Dynamic communication current limit disabled. <10> AD-EN pulled low, wireless charging disabled. <11> Wired and wireless charging disabled. EN2 G2 11 I www.ti.com BQ51013B SLUSB62D – MARCH 2013 – REVISED SEPTEMBER 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 5 Product Folder Links: BQ51013B |
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