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AIC1533PLTR Datasheet(PDF) 10 Page - Analog Intergrations Corporation |
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AIC1533PLTR Datasheet(HTML) 10 Page - Analog Intergrations Corporation |
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10 / 17 page  AIC1533 10 PIN DESCRIPTIONS PIN 1: ADJ - Providing VADJ=1.25V (typ.) for adjustable VOUT. PIN 2: OUT - Adjustable LDO regulator output. PIN 3: FBP - Positive charge pump feedback input. Regulates to 1.25V typical. PIN 4: SHDN - Active-Low logic level shutdown input. Connecting SHDN to VCC for typical operation. PIN 5: VCC - Supply input. PIN 6: SUPP - Positive charge pump supply pin. It monitors negative charge pump. PIN 7: SWP - Positive charge pump driver output. Output high level is VCC, and low level is GND. PIN 8: PGND - Power ground. Connecting to GND. PIN 9: SWN - Negative charge pump driver output. Output high level is VCC, and low level is GND. PIN 10: TN - Programmable delay time pin. The capacitor on this pin sets negative charge pump to provide independent time control. Or TN connects to high level directly if it is not in use for programming delay time. PIN 11: TP - Programmable delay time pin. The capacitor on this pin sets positive charge pump to provide independent time control. Or TP connects to high level directly if it is not in use for programming delay time. PIN 12: FBN - Negative charge pump feedback input. Regulates to 0V typical. PIN 13: VREF - Internal reference bypass terminal. Connecting a 0.22 µF capacitor to ground. Providing a positive voltage greater than negative feedback voltage to obtain a positive voltage for FBN. PIN 14: GND - Ground. Tie GND pin directly to local ground plane to obtain best performance. APPLICATION INFORMATION Introduction AIC1533 is composed of dual charge pumps and a regulator to provide three independent regulated voltages exclusively designed for thin-film transistor (TFT) liquid crystal display (LCD) applications. LDO regulator has an adjustable output voltage with a low dropout voltage of 500mV at 300mA load current. Two independent charge pumps regulate a positive output and a negative output by using a 1MHz switching frequency, and a pulse-width-modulation (PWM) architecture. AIC1533 provides a start-up sequence function with an adjustable start-up delay time. In shutdown mode, it only consumes 0.1 µA supply current. AIC1533 also features an internal current limit and thermal shutdown protection. Operation As Fig. 16 shows, two internal MOSFETs - Q2, Q3, and external components comprise a positive charge pump, whose output is three times as much as input voltage. After delay time, which determined by CP, Q1 turns on. During on state, which indicates Q2 is at off stage and Q3 at on stage, CFLY1 connects VCC and PGND and is charged by VCC. |
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