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AAT3193IJQ-4 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT3193IJQ-4 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 17 page  AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers 3193.2007.05.1.0 9 Functional Block Diagram C– C+ OUT GND IN D3 D2 D1 S 2Cwire Control (PWM Control) DAC EN/SET (EN/PWM) RSET Two-Mode CP Control VF Monitoring 3 IREF Functional Description The AAT3192 and AAT3193 are low-cost charge- pump solutions designed to drive up to three white LEDs. The charge pump operates from a 2.7V to 5.5V power source and converts it to voltage levels necessary to drive the LEDs. LED current is indi- vidually 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 automatically switches back to 1x mode when there is sufficient input voltage. The AAT3192/93 requires only four external compo- nents: one 1µF ceramic capacitor for the charge pump flying capacitors (C P), one 1µF ceramic input capacitor (C IN), one 1µF ceramic output capacitor (C OUT) and a resistor (RSET) to set the maximum LED current. The three constant current outputs of AAT3193 (D1 to D3) can drive three individual LEDs with a maximum current of 30mA each. AAT3192 can drives two constant output sinks (D1 and D2) with up to 30mA maximum current each. AnalogicTech's S 2Cwire serial Interface enables the AAT3192/93-1/ -2/-3 and changes the current sink magnitudes through the EN/SET pin. The AAT3192/93-4 uses an external PWM signal to enable the IC and control the brightness of the LEDs. Constant Current Control using R SET The maximum current is programmed by an external resistor at the RSET pin. Using a 14.3kΩ external resistor at the RSET pin, the AAT3192/93-1/-2/-4 includes an integrated serial LED current control that sets the full-scale LED current between 20mA and 0.63mA. For the AAT3192/93-3, a 10.7kΩ external resistor at the RSET pin sets the fu ll-scale LED cur- rent 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. |
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