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AAT3192IJQ-4-T1 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT3192IJQ-4-T1 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 18 page  AAT3192 2-Channel Charge-Pump LED Driver ChargePumpTM PRODUCT DATASHEET 3192.2008.07.1.3 9 www .analogictech.com AAT3192 2-Channel Charge-Pump LED Driver ChargePumpTM PRODUCT DATASHEET 3192.2008.07.1.3 9 www .analogictech.com Functional Description The AAT3192 is a low-cost charge-pump solution designed to drive up to two white LEDs. The charge pump oper- ates from a 2.7V to 5.5V power source and converts it to voltage levels necessary to drive the LEDs. LED current is individually controlled through integrated current sinks powered from the output of the charge pump. Low 1x charge-pump output resistance and low-drop voltage current sinks allow the charge pump to stay in 1x mode with an input voltage as low as 3.75V and LED forward voltages as high as 3.5V. Once in 2x mode, the charge pump monitors the input supply voltage and automati- cally switches back to 1x mode when there is sufficient input voltage. The AAT3192 requires only four external components: one 1μF ceramic capacitor for the charge pump flying capacitors (CP), one 1μF ceramic input capacitor (CIN), one 1μF ceramic output capacitor (COUT) and a resistor (RSET) to set the maximum LED current. The AAT3192 can drive two constant output sinks (D1 and D2) with up to 30mA maximum current each. AnalogicTech’s S2Cwire serial interface enables the AAT3192-1/-2/-3 and chang- es the current sink magnitudes through the EN/SET pin. The AAT3192-4 uses an external PWM signal to enable the IC and control the brightness of the LEDs. Constant Current Control using RSET The maximum current is programmed by an external resistor at the RSET pin. Using a 14.3kΩ external resis- tor at the RSET pin, the AAT3192-1/-2/-4 includes an integrated serial LED current control that sets the full- scale LED current between 20mA and 0.63mA. For the AAT3192-3, a 11.5kΩ external resistor at the RSET pin sets the full-scale LED current between 20mA and 1.3mA. The full-scale LED current can set higher or lower than 20mA; see Table 5. For maximum accuracy, a 1% tolerance resistor is recommended. Functional Block Diagram C- C+ OUT GND IN D2 D1 S2Cwire Control (PWM Control) DAC EN/SET (EN/PWM) RSET Two-Mode CP Control VF Monitoring 2 IREF |
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