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AAT3113ITP-20-T1 Datasheet(PDF) 7 Page - Advanced Analogic Technologies |
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AAT3113ITP-20-T1 Datasheet(HTML) 7 Page - Advanced Analogic Technologies |
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7 / 14 page  Functional Block Diagram Voltage Reference Soft Start 600kHz Oscillator 1.5X Charge Pump S2Cwire Interface 32x8 bit ROM Current Mode DAC 8 5 VIN C1+ C1- C2+ C2- OUT D1 D2 D3 D4 GND * AAT3114 only EN/SET D5* D6* AAT3113/4 High Efficiency 1.5X Fractional Charge Pumps For White LED Applications 3113.2004.07.1.4 7 Functional Description The AAT3113/4 is a high efficiency 1.5X fractional charge pump device intended for white LED back light applications. The fractional charge pump con- sists of a linear regulator followed by a 1.5X charge pump. The AAT3113/4 requires only four external components: two 1µF ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1µF ceramic capacitor for CIN, and one 0.33µF to 1µF ceramic capacitor for COUT. The charge pump output is converted into four or six constant current outputs (D1 to D4 or D6) to drive four or six individ- ual LEDs with a maximum of 20mA each. The cur- rent source output magnitude is controlled by the EN/SET serial data S2C interface. The interface records rising edges of the EN/SET pin, and decodes them into 32 individual current level set- tings each 1dB apart (see Current Level Settings below). Code 32 is full scale, and Code 1 is full scale attenuated by 31dB. The modulo 32 interface wraps states back to state 1 after the 32nd clock. With each EN/SET pulse, the output current increas- es by 1dB. To decrease the output current by 1dB, 31 EN/SET clock pulses are required. The counter can be clocked at speeds up to 1Mhz, so intermedi- ate states are not visible. The first rising edge of EN/SET enables the IC and initially sets the output LED current to -31dB, the lowest setting equal to 525µA. Once the final clock cycle is input for the desired brightness level, the EN/SET pin is held high to maintain the device output current at the pro- grammed level. The device is disabled 500µs after the EN/SET pin transitions to a logic low state. |
Similar Part No. - AAT3113ITP-20-T1 |
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Similar Description - AAT3113ITP-20-T1 |
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