ltc3220 Linear Technology Corporation, ltc3220 Datasheet
ltc3220
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ltc3220 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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... CPO I (Note 2) ..................................................25mA ULED1-18 CPO Short-Circuit Duration .............................. Indefi nite Operating Temperature Range (Note 3) LTC3220E/LTC3220E-1 ........................ –40°C to 85°C LTC3220I/LTC3220I-1 ........................ –40°C to 125°C Storage Temperature Range ................... –65°C to 150°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3220EPF#PBF ...
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... Condition t Hold Time After (Repeated) Start Condition HD,STA t Repeated Start Condition Setup Time SU,STA t Stop Condition Setup Time SU,STO 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 ...
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... Note 2: Based on long term current density limitations. Note 3: The LTC3220E/LTC3220E-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. The LTC3220I/LTC3220I-1 are guaranteed to meet performance specifi ...
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... CPO DV Current vs DV Voltage CC CC 3.0 RST = SDA = DV CC 2.5 2 400kHz SCL 1 100kHz SCL 1.0 0 10kHz SCL 0 1.5 2.5 3.5 4.5 5.5 DV VOLTAGE (V) CC LTC3220/LTC3220 25°C unless otherwise noted. A 1.5x Mode CPO Voltage vs I 4.8 4.6 4.4 4.2 3V 3.1V 3.2V 4.0 3.3V 3.4V 3.8 3 120 180 240 125 I (mA) CPO 3220 G05 Oscillator Frequency vs V Voltage IN 810 ...
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... G16 DV (Pin 10): Supply Voltage for All digital I/O lines. This CC pin sets the logic reference level of the LTC3220/LTC3220-1. DV will reset the data registers when set below the CC undervoltage lockout threshold. A 0.1μF X5R or X7R ceramic capacitor should be connected to ground. SCL (Pin 11): I ...
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... PIN FUNCTIONS 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 to DV C1P , C2P , C1M, C2M (Pins 27, 26, 23, 22): Charge Pump Flying Capacitor Pins. A 2.2μF X7R or X5R ceramic ca- pacitor should be connected from C1P to C1M and C2P to C2M ...
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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 Gradation Ramp Times and Period On Time 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 D1 (GB1) ...
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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 ± 0.05 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 0.25 × 45° CHAMFER TYP 27 28 0.40 ± 0 2.64 ± 0.10 2.64 ± 0.10 (PF28) UTQFN 0907 0.20 ± ...
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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 4.7μF LTC3220 LTC3220 ULED1- 0.1μF 2 SCL/SDA I C RST GND RELATED PARTS PART NUMBER DESCRIPTION LTC3205 250mA, 1MHz, Multi-Display LED Controller ...