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MAX8939EWVT Datasheet(PDF) 13 Page - Maxim Integrated Products |
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MAX8939EWVT Datasheet(HTML) 13 Page - Maxim Integrated Products |
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13 / 43 page  ______________________________________________________________________________________ 13 System Power Management for Mobile Handset Pin Description Pin Configuration PIN NAME FUNCTION A1 PGND2 Power Ground for WLED Boost Converter. Connect PGND1, PGND2, and AGND to the PCB ground plane. A2 LX2 Inductor Connection and Switching Node for WLED Boost Converter A3 OUT2 WLED Step-Up Converter Output. Connect a 1FF capacitor from OUT2 to PGND2. A4 OUT1 Step-Up Converter Output. Connect a 2.2FF capacitor from OUT1 to ground. A5 LX1 Inductor Connection and Switching Node for OUT1 Step-Up Converter A6 PGND1 Power Ground for OUT1 Step-Up Converter. Connect PGND1, PGND2, and AGND to the PCB ground plane. B1 COMP2 Step-Up Compensation Node for OUT2 Step-Up Converter. Connect a 0.22FF ceramic capacitor from COMP to ground. The applied COMP capacitance stabilizes the converter and sets the soft- start time. COMP discharges to ground through a 20kI resistance when in shutdown. B2 LED1 25mA LED Current Regulator. Connect LED1 to the cathode of the first LED string. B3 RESET_IN Active-Low Reset Input. Pulse RESET_IN low to reset all registers (except STATUS and EVENT) to their default state. B4 SCL Clock Input for I2C Serial Interface. High impedance when the I2C interface is off. B5 LDO1_EN Enable Input for LDO1. Drive LDO1_EN high to enable LDO1, or low to disable LDO1. Once LDO1 is enabled or disabled through I2C, the state of LDO1_EN is ignored until reset. B6 COMP1 Compensation for OUT1 Step-Up Converter. Connect a 2200pF capacitor from COMP1 to ground. See the Soft-Start OUT1 section for more details. TOP VIEW (BUMPS ON BOTTOM) A B C D WLP 0.5mm PITCH E LX2 2 LED1 LED2 OUTVIB CHG_MON OUT1 4 SCL SDA PWR_ON_CMP BATT PGND2 A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6 D1 D2 D3 D4 D5 D6 E1 E2 E3 E4 E5 E6 1 COMP2 LED3 SAFE_OUT CHG_IN LX1 LDO1_EN LDO3 LDO4 5 AGND PGND1 COMP1 LDO2 LDO1 6 REF OUT2 3 RESET_IN CHG IRQ INVIB + |
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