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AAT2861IMK-3-T1 Datasheet(PDF) 2 Page - Advanced Analog Technology, Inc. |
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AAT2861IMK-3-T1 Datasheet(HTML) 2 Page - Advanced Analog Technology, Inc. |
2 / 27 page AAT2861 Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit ChargePump TM PRODUCT DATASHEET 2 2861.2009.02.1.2 www .analogictech.com AAT2861 Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit ChargePump TM PRODUCT DATASHEET 2 2861.2009.02.1.2 www .analogictech.com Pin Descriptions Pin # Symbol Description 1 OUT Charge pump output. OUT is the output of the charge pump and supplies current to the backlight and flash LEDs. Connect the backlight and flash LED anodes to OUT. Bypass OUT to PGND with a 2.2μF or larger ceramic capacitor as close to the AAT2861 as possible. 2 C2+ Positive terminal of charge pump capacitor 2. Connect the 1μF charge pump capacitor 2 from C2+ to C2-. 3 EN/SET AS2Cwire serial input. EN/SET is the address and data input of the AS2Cwire serial interface. AS2Cwire is used to control backlight, flash and LDO functions. 4 FL_EN Flash enable. FL_EN is the enable control for the Flash LEDs. For the FL_EN pin to enable the flash current, the EN/SET pin must also be pulled high. 5 EN_LDOA LDO A enable pin. EN_LDOA turns on or off LDO regulator A. The EN/SET pin must also be pulled high for LDO A to be enabled. The EN_LDOA input can be overwritten via the AS2Cwire interface to disable LDO A. 6 EN_LDOB/C LDO B and LDO C enable pin. EN_LDOB/C enables both LDO regulators B and C. The EN/SET pin must also be pulled high for the LDO regulators to be enabled. The EN_LDOB/C input can be overwritten via the AS2Cwire interface to disable either LDO B or LDO C. 7 AGND Analog ground. Connect AGND to PGND at a single point as close to the AAT2861 as possible. 8 LDOC LDOC is the voltage output of LDO C. Bypass LDOC to AGND with a 2.2μF or larger capacitor as close to the AAT2861 as possible. 9 IN Input power pin for all three LDOs. Connect Pin 9 to Pin 23 with as short a PCB trace as practical. 10 LDOB LDOB is the voltage output of LDO B. Bypass LDOB to AGND with a 2.2μF or greater capacitor as close to the AAT2861 as possible. 11 LDOA LDOA is the voltage output of LDO A. Bypass LDOA to AGND with a 2.2μF or larger ceramic capacitor as close to the AAT2861 as possible. 12 BL1 Backlight LED 1 current sink. BL1 controls the current through backlight LED 1. Connect the cathode of backlight LED 1 to BL1. If not used, connect BL1 to OUT. 13 BL2 Backlight LED 2 current sink. BL2 controls the current through backlight LED 2. Connect the cathode of backlight LED 2 to BL2. If not used, connect BL2 to OUT. 14 BL3 Backlight LED 3 current sink. BL3 controls the current through backlight LED 3. Connect the cathode of backlight LED 3 to BL3. If not used, connect BL3 to OUT. 15 BL4 Backlight LED 4 current sink. BL4 controls the current through backlight LED 4. Connect the cathode of backlight LED 4 to BL4. If not used, connect BL4 to OUT. 16 BL5 Backlight LED 5 current sink. BL5 controls the current through backlight LED 5. Connect the cathode of backlight LED 5 to BL5. If not used, connect BL5 to OUT. 17 BL6 Backlight LED 6 current sink. BL6 controls the current through backlight LED 6. Connect the cathode of backlight LED 6 to BL6. If not used, connect BL6 to OUT. 18 BL7 (FL2) AAT2861-1/3: Backlight LED 7 current sink. BL7 controls the current through backlight LED 7. Connect the cathode of backlight LED 7 to BL7. If not used, connect BL7 to OUT. AAT2861-2: Flash LED 2 current sink. FL2 controls the current through Flash LED 2. Connect the cathode of Flash LED 2 to FL2. If not used, connect FL2 to OUT. 19 FL1 Flash LED 1 current sink. FL1 controls the current through Flash LED 1. Connect the cathode of Flash LED 1 to FL1. If not used, connect FL1 to OUT. 20 PGND Power ground. Connect PGND to AGND at a single point as close to the AAT2861 as possible. 21 C2- Negative terminal of charge pump capacitor 2. 22 C1- Negative terminal of charge pump capacitor 1. 23 IN Power input. Connect IN to the input source voltage. Bypass IN to PGND with a 2.2μF or larger ceramic capacitor as close to the AAT2861 as possible. 24 C1+ Positive terminal of charge pump capacitor 1. Connect the 1μF charge pump capacitor 1 from C1+ to C1-. EP Exposed paddle (bottom) Connect to PGND/AGND. |
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