ltc3220-ltc3220-1 Linear Technology Corporation, ltc3220-ltc3220-1 Datasheet
ltc3220-ltc3220-1
Related parts for ltc3220-ltc3220-1
ltc3220-ltc3220-1 Summary of contents
Page 1
... The fi rst dropout switches the parts into 1.5x mode and a subsequent dropout switches the LTC3220/LTC3220-1 into 2x mode. The parts reset to 1x mode whenever a data bit is updated via the I L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ...
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... TAPE AND REEL LTC3220EPF#PBF LTC3220EPF#TRPBF LTC3220EPF-1#PBF LTC3220EPF-1#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...
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... Clock High Period HIGH t Clock Data Fall Time f t Clock Data Rise Time r t Spike Supression Time SP LTC3220/LTC3220-1 The l denotes the specifi cations which apply over the full operating = 3V, RST = high 2.2μ 4.7μ 25° 3.6V CONDITIONS ULED Data Register Programmed to ...
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... Note 2: Based on long term current density limitations. Note 3: The LTC3220/LTC3220-1 are guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
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... Current CPO (I – VIN CPO 360 240 0 60 120 180 I (mA) CPO LTC3220/LTC3220 25°C unless otherwise noted. A Oscillator Frequency vs V Voltage IN 810 800 790 780 3V 770 760 T = 25° 85°C A 750 740 730 300 360 2 ...
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... SCL (Pin 11 Clock Input. The logic level for SCL is referenced SDA (Pin 12): Input Data for the Serial Port. Serial data is shifted in one bit per clock cycle to control the LTC3220/ LTC3220-1. The logic level is referenced ULED Pin Dropout Voltage ...
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... C1P 850kHz OSCILLATOR CHARGE PUMP – + 1.22V CONTROL LOGIC MASTER/SLAVE REG SHIFT REGISTER ULED17 ULED16 ULED15 ULED14 ULED13 ULED12 LTC3220/LTC3220 EXPOSED C1M C2P C2M PAD 29 CPO 28 ULED1 1 ULED2 2 ULED3 3 ULED4 4 ULED5 5 18 ULED6 18 UNIVERSAL 6 CURRENT SOURCES ...
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... CPO. This mode provides IN maximum effi ciency and minimum noise. The LTC3220/ LTC3220-1 will remain in 1x mode until an LED current source drops out. Dropout occurs when a current source voltage becomes too low for the programmed current to be supplied. When dropout is detected, the LTC3220/ LTC3220-1 will switch into 1.5x mode. The CPO voltage will then start to increase and will attempt to reach 1.5× ...
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... OL nifi cant overall increase in available current is achieved. Mode Switching The LTC3220/LTC3220-1 will automatically switch from 1x mode to 1.5x mode and subsequently to 2x mode whenever a dropout condition is detected at an LED pin. Dropout occurs when a current source voltage becomes too low for the programmed current to be supplied ...
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... Serial Port The microcontroller compatible I all of the command and control inputs for the LTC3220/ LTC3220-1. Data on the SDA input is loaded on the rising edge of SCL loaded fi rst and D0 last. There are 20 data registers, one address register and one sub-ad- dress register. Once all address bits have been clocked into the address register, an acknowledge occurs ...
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... The LTC3220/LTC3220-1 are receive-only (slave) devices. There are two I address is 0011100 and the LTC3220-1 I 0011101. The I the LTC3220 and LTC3220-1. Write Word Protocol Used By the LTC3220/LTC3220 Slave Address Wr A *Sub-Address A Data Byte S = Start Condition Write Bit = Acknowledge Stop Condition *The sub-address uses only the fi ...
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... LTC3220/LTC3220-1 OPERATION Sub-Address Byte MSB LSB ...
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... GB4 GB3 GB2 Blink Period D2 (GB2) 0.625s 1.25s 0 0.156s 1.25s 0 0.625s 2.5s 1 0.156s 2.5s 1 LTC3220/LTC3220-1 LSB Bit 2 Bit 1 Bit LSB D1 D0 GB1 Up Gradation Times and Period D1 (GB1) Gradation ...
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... I C device. Byte Format Each byte sent to the LTC3220/LTC3220-1 must be 8 bits long followed by an extra clock cycle for the Acknowledge bit to be returned by the LTC3220/LTC3220-1. The data should be sent to the LTC3220/LTC3220-1 most signifi cant bit (MSB) fi rst. ...
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... OPERATION Bus Write Operation The master initiates communication with the LTC3220/ LTC3220-1 with a Start condition and a 7-bit address fol- lowed by the Write Bit R the address matches that of the LTC3220/LTC3220-1, the LTC3220/LTC3220-1 return an Acknowledge. The master should then deliver the most signifi cant sub-address byte for the data register to be written. Again the LTC3220/LTC3220-1 acknowledge and then the data is delivered starting with the most signifi ...
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... APPLICATIONS INFORMATION V , CPO Capacitor Selection IN The style and value of the capacitors used with the LTC3220/ LTC3220-1 determine several important parameters such as regulator control loop stability, output ripple, charge pump strength and minimum start-up time. To reduce noise and ripple recommended that low ...
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... PCB runs. Magnetic fi elds can also be generated if the fl ying capaci- tors are not close to the LTC3220/LTC3220-1 (i.e., the loop area is large). To decouple capacitive energy transfer, a Faraday shield may be used. This is a grounded PCB trace between the sensitive node and the LTC3220/LTC3220-1 pins ...
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... P IN The effi ciency of the LTC3220/LTC3220-1 depends upon the mode in which it is operating. Recall that the LTC3220/ LTC3220-1 operate as pass switches, connecting V CPO, until dropout is detected at the I provides the optimum effi ciency available for a given input voltage and LED forward voltage. When it is operating as a switch, the effi ...
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... PF Package 28-Lead UTQFN (4mm × 4mm) (Reference LTC DWG # 05-08-1759 Rev Ø) 0.70 0.05 PACKAGE OUTLINE 0.20 0.05 0.40 BSC 0.55 0. 0.05 TYP 2.40 REF 0.127 REF 0.00 – 0.05 LTC3220/LTC3220-1 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP OR 0. 0.10 CHAMFER TYP 27 28 0.40 0 2.64 0.10 2 ...
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... LTC3220/LTC3220-1 TYPICAL APPLICATION Cellular Phone Multi-Display LED Controller with Auxiliary Current Source Output 2.2μF 2.2μF C1P C1M C2P C2M V V CPO IN IN 2.2μF LTC3220 4.7μF LTC3220 ULED1- 0.1μF 2 SCL/SDA I C RST GND RELATED PARTS PART NUMBER DESCRIPTION LTC3205 250mA, 1MHz, Multi-Display LED Controller ...