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| AIC1650 3-Cell, High-Efficiency, Inverting DC/DC Converter FEATURES 4V to 20V Input Voltage Operation. Adjustable Output Voltage up to -40V. Low Quiescent Current at 100A. Pulse Frequency Modulation Maintains High Efficiency (max. 90%). 100KHz to 320KHz Switching Frequency. Power-Saving Shutdown Mode (8A Typical). High Efficiency with Low Cost External PNP Bipolar Transistor. DESCRIPTION The AIC1650 is a high performance inverting DC/DC converter, designed to drive an external power switch to generate programmable negative voltages. In the particularly suitable LCD bias contrast application, maximum efficiency of 90% can be achieved with low cost PNP bipolar transistor drivers. 4V to 20V input operation range allows the AIC1650 to be powered directly by the battery pack in most batteryoperated applications for greater efficiency. Output voltage can be scaled to -40V or greater by two external resistors. A pulse frequency modulation scheme is employed to maintain high efficiency conversion under wide input voltage range. Quiescent current is about 100A and can be reduced to 8A in shutdown mode. Switching frequency being around 100KHz to 320KHz range, small size switching components are ideal for battery powered portable equipments, like notebook and palmtop computers. APPLICATIONS Negative LCD Contrast Bias for 1. Notebook & Palmtop Computers. 2. Pen-Based Data System. 3. Portable Data Collection Terminals. 4. Personal Digital Assistants. Negative Voltage Supply. TYPICAL APPLICATION CIRCUIT VIN +4V ~ 20V 100F + C1 VIN VREF SHDN 5V FB AIC1650 0.047F C4 100K R2 R1 1M C3 10nF * Sumida CD-54 SERIES VOUT = -1.22V x R1/R2 CL DHI DLOW GND RB 1.5K~12K 100F *L 150H C2 + Q1 2N2907A D1 1N5819 VOUT -12V~ -40V Negative LCD Contrast Bias Power Supply Analog Integrations Corporation DS-1650-02 Dec 27, 00 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1650 ORDERING INFORMATION AIC1650 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0C~+70C ORDER NUMBER AIC1650CN (PLASTIC DIP) AIC1650CS (PLASTIC SO) PIN CONFIGURATION TOP VIEW VIN VREF SHDN FB 1 2 3 4 8 7 6 5 CL DHI DLOW GND ABSOLUTE MAXIMUM RATINGS Supply Voltage ............................................................................................... 20V SHDN Voltage ................................................................................................ 15V Operating Temperature Range .............................................................. 0C~ 70C Storage Temperature Range ........................................................... -65C~ 150C TEST CIRCUIT Refer to Typical Application Circuit. ELECTRICAL CHARACTERISTICS fied.) PARAMETER Input Voltage Switch Off Current VREF Voltage VREF Source Current DLOW "ON Resistance" DHI "ON Resistance" CL Threshold Shutdown Threshold Shutdown Mode Current VSHDN=0V VFB = -50mV ISOURCE = 250A (VIN=13V, Ta=25C, unless otherwise speci TEST CONDITIONS MIN. 4 TYP. MAX. 20 UNIT V 100 1.16 250 15 10 50 0.8 70 1.5 8 1.22 200 1.28 A V A 90 2.4 20 mV V A 2 AIC1650 TYPICAL PERFORMANCE CHARACTERISTICS 350 (Ta=25C) VREF Source Current vs VIN Shutdown Current vs VIN 20 Source Current (A) 300 Shutdown Current (A) 4 8 12 16 20 15 250 10 200 5 150 0 4 6 8 10 12 14 16 18 20 VIN (V) VIN (V) Frequency vs VIN Voltage 100 Duty Cycle vs VIN Voltage 330 90 280 Duty Cycle (%) Frequency (kHz) Ta=0C 230 80 Ta=70C 70 180 Ta=25C Ta=70C Ta=0C 60 130 Ta=25C 50 80 4 8 12 16 20 4 8 12 16 20 VIN (V) VIN (V) BLOCK DIAGRAM VIN 1 CURRENT LIMIT COMPARATOR + PFM OSCILLATOR 1.22V REFERENCE VOLTAGE + V IN 70mV 8 CL LATCH VREF 2 V IN 7 DHI SHDN 3 OUTPUT DRIVER 6 DLOW FB 4 - 5 ERROR COMPARATOR GND 3 AIC1650 PIN DESCRIPTIONS PIN 1: VIN - 4V to 20V input supply voltage. PIN 2: VREF - 1.22V reference output. Bypass with a 0.047F capacitor to GND. Sourcing capability is guaranteed to be greater than 250A. PIN 3: SHDN- Logic input to shutdown the chip. >1.5V = normal operation, GND = shutdown In shutdown mode DLOW and DHI pins are at high level. PIN 4: FB - Feedback signal input to sense ground. Connecting a resistor R1 to VOUT and a resistor R2 to VREF pin yields the output voltage: VOUT = -(R1/R2 ) x VREF PIN 5: GND - Power ground. PIN 6: DLOW - Driver sinking output. Connected to DHI when using an external P-channel MOSFET. When using an external PNP bipolar transistor, connect a resistor RB from this pin to DHI. RB value depends on VIN, inductor and PNP bipolar transistor. By adjusting the RB value, efficiency can be optimized. PIN 7: DHI - Driver sourcing output. Connect to gate of the external P-channel MOSFET or base of the PNP bipolar transistor. - Current-limit input. This pin clamps the switch peak current to prevent over-current damage to the external switch. PIN 8: CL APPLICATION INFORMATIONS Max. Output Power vs VIN 1.8 1.6 1.4 The typical application circuit generates an adjustable negative voltage for contrast bias of LCD displays. Efficiency and output power can be optimized by using appropriate inductor and switch. The following formulas provide a guideline for determining the optimal component values: L = (11.1 - 0.15 x V IN) x Typical Application Circuit 100H 120H 150H Max. Output Power (W) 1.2 1 0.8 0.6 0.4 0.2 0 180H 220H 270H 300H 330H V IN I OUT x V OUT Inductor Value 4 6 8 10 12 14 16 18 20 PNP : V CEO > V IN + V OUT I C,MAX 200 x V CE < 0. 4V at I and = 10 I OUT V IN C VIN (V) = 200 x IOUT V IN RB 3 x L x (VIN - 0.8) where, units: VIN & VOUT in V, IOUT in A, L in H, RB in 4 AIC1650 APPLICATION EXAMPLES 95 Efficiency vs Load Current VOUT = -15V L =220H 95 Efficiency vs VIN VOUT =-15V IOUT =-10mA L=300H 90 VIN=13V VIN =8V VIN=18V Efficiency (%) Efficiency (%) 90 L=220H 85 85 L=150H 80 75 0 5 10 15 20 25 30 80 4 6 8 10 12 14 16 18 20 Load Current (mA) VIN (V) 95 Efficiency vs Load Current VOUT =-22V L =220H 95 Efficiency vs VIN VOUT =-22V IOUT =-10mA 90 VIN=8V VIN=18V VIN=13V L=300H Efficiency (%) 85 Efficiency (%) 90 L=220H L=150H 85 80 75 0 5 10 15 20 25 30 80 4 6 8 10 12 14 16 18 20 Load Current (mA) VIN (V) Efficiency vs Load Current 95 95 Efficiency vs VIN VOUT = -30V IOUT = -10mA VOUT = -30V L = 220H 90 VIN=13V 90 L=300H L=220H VIN=8V VIN=18V Efficiency (%) 85 Efficiency (%) L=150H 85 80 75 0 5 10 15 20 25 30 80 4 6 8 10 12 14 16 18 20 Load Current (mA) VIN (V) 5 AIC1650 PHYSICAL DIMENSIONS 8 LEAD PLASTIC SO (unit: mm) D SYMBOL A H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40 MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27 A1 B C D E e A C A1 e H L L 1.27(TYP) B 8 LEAD PLASTIC DIP (unit: mm) D SYMBOL A1 E1 MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92 MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81 A2 b C E D E C A2 A1 L E1 e eB L 2.54 (TYP) eB b e 6 |
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