LTC3205EUF Linear Technology, LTC3205EUF Datasheet
LTC3205EUF
Specifications of LTC3205EUF
Available stocks
Related parts for LTC3205EUF
LTC3205EUF Summary of contents
Page 1
... Up to 4096 Color Combinations for RGB Display Low Shutdown Current: I < Tiny 24-Lead (4mm 4mm) QFN Package U APPLICATIO S Cellular Phones Wireless PDAs Multidisplay Handheld Devices , LTC and LT are registered trademarks of Linear Technology Corporation. * U.S. Patent 6,411,531 U TYPICAL APPLICATIO MAIN DISPLAY IN 2.8V TO ...
Page 2
... Serial Port Idle 25 A < I < MAIN1-MAIN4, SUB1, SUB2 Voltage = MAIN1-MAIN4, SUB1, SUB2 Voltage = MAIN1-MAIN4, SUB1, SUB2 Voltage = 1V MS Any Two MAIN or SUB Outputs 25 A < I < RGB RED, GREEN, BLUE Voltage = TOP VIEW ORDER PART NUMBER LTC3205EUF 18 RED 17 SGND CPO RGB UF PART MARKING 3205 ...
Page 3
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Charge Pump (CPO) 1:1 Mode Output Impedance 2:3 Mode Output Impedance CPO Regulation Voltage CLK Frequency D , SCLK, LD, STEPUP, ENRGB IN V Low Level Input Voltage IL ...
Page 4
LTC3205 W U TYPICAL PERFOR A CE CHARACTERISTICS 1:1 Mode Switch Resistance vs Temperature 1 100mA CPO V = 3. 3.9V IN 0.8 0.7 0.6 –15 35 – ...
Page 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Input Supply Voltage Required for Higher LED Currents 3 3 3.5 3.3 3.1 I RGB 2.9 2.7 2 100 125 175 200 225 ...
Page 6
LTC3205 CTIO S V (Pin 16): Supply Voltage for the Charge Pump. The V IN pin should be connected directly to the battery and by- passed with X5R or X7R ceramic capacitor. ...
Page 7
U OPERATIO Power Management To optimize efficiency, the power management section of the LTC3205 provides two methods of supplying power to the CPO pin: 1:1 direct connect mode or 2:3 boost mode. When either the main or sub displays of ...
Page 8
LTC3205 U OPERATIO LTC3205 is in shutdown when DV however, that all of the logic signals that are referenced SCLK, LD, ENRGB and STEPUP) will need below (i.e., ground) ...
Page 9
U OPERATIO Unused MAIN or SUB Display LED Pins Any of the six white LED pins (MAIN1-MAIN4, SUB1 and SUB2) can cause the LTC3205 to switch from 1:1 mode to 2:3 charge pump mode if they drop out ...
Page 10
LTC3205 U U APPLICATIO S I FOR ATIO necessary for LD to load the data once it has shifted into the device. Command data is latched into the command register on the falling edge of the LD signal. The LTC3205 ...
Page 11
U U APPLICATIO S I FOR ATIO lose considerable capacitance over that range. Z5U and Y5V capacitors may also have a very strong voltage coefficient causing them to lose 60% or more of their capacitance when the rated voltage is ...
Page 12
LTC3205 U U APPLICATIO S I FOR ATIO The efficiency of the LTC3205 depends upon the mode in which it is operating. Recall that the LTC3205 operates as a pass switch, connecting V to CPO until one of the LEDs ...
Page 13
U U APPLICATIO S I FOR ATIO If the desired input voltage range is below the data shown in Figure 9, and a precise control of the LED current is desired, then a precision current source may be added to ...
Page 14
LTC3205 U TYPICAL APPLICATIO S All Charge Pump Main, Sub, RGB and Camera Light Controller 15 CPO LTC3205 2 MAIN1 1 MAIN2 24 MAIN3 23 MAIN4 22 SUB1 21 SUB2 18 RED 19 GREEN 20 BLUE I I RGB MS ...
Page 15
... ALL DIMENSIONS ARE IN MILLIMETERS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 4-LED Main Display Plus 160mA 4-LED Camera Light ...
Page 16
... DC/DC Converter LTC3440 600mA (I ), 2MHz Synchronous Buck-Boost OUT DC/DC Converter LT3465/LT3465A 1.2MHz/2.7MHz with Internal Schottky ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 Using the RGB Display as a Camera Light L1 2.2 H ...