LTC3210EPD-1#TRPBF Linear Technology, LTC3210EPD-1#TRPBF Datasheet
LTC3210EPD-1#TRPBF
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LTC3210EPD-1#TRPBF Summary of contents
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FeaTures Low Noise Charge Pump Provides High Efficiency n with Automatic Mode Switching Multimode Operation: 1x, 1.5x Individual Full-Scale Current Set Resistors 500mA Total Output Current n Single Wire EN/Brightness Control for MAIN and n ...
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... Storage Temperature Range .................. –65°C to 125°C orDer inFormaTion LEAD FREE FINISH TAPE AND REEL LTC3210EUD-1#PBF LTC3210EUD-1#TRPBF LTC3210EPD-1#PBF LTC3210EPD-1#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ elecTrical characTerisTics temperature range, otherwise specifications are at T ENM = high, unless otherwise noted. ...
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T ENM = high, unless otherwise noted. PARAMETER Unused MLED Detection Test Current Threshold Voltage CLED Current LED Current Ratio ( CLED RC LED Dropout Voltage CLED Current, 3-Bit Linear DAC Charge Pump (CPO) 1x Mode Output Voltage 1.5x Mode Output Voltage 2x Mode Output Voltage 1x Mode Output Impedance 1.5x Mode Output Impedance 2x Mode Output Impedance CLOCK Frequency ...
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LTC3210-1 Typical perFormance characTerisTics Dropout Time from Shutdown 5.1V 2X CPO 1.5X 1V/DIV 1X EN 2V/DIV MODE RESET 500µs/DIV 32101 G01 2x CPO Ripple V = 3.6V BAT I = 200mA CPO C = 2.2µF CPO V CPO 20mV/DIV AC- ...
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Typical perFormance characTerisTics CLED Pin Dropout Voltage vs CLED Pin Current 500 V = 3.6V BAT 400 300 200 100 0 50 100 150 200 250 300 350 CLED PIN CURRENT (mA) 32101 G10 V Shutdown Current BAT vs V ...
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LTC3210-1 Typical perFormance characTerisTics MLED Pin Current vs MLED Pin Voltage 3.6V BAT 0.00 0.04 0.06 0.08 0.10 0.02 MLED PIN VOLTAGE (V) MLED Current vs ...
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FuncTions C1P , C2P , C1M, C2M (Pins 1, 16, 14, 13): 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. CPO (Pin 2): Output of the Charge Pump Used to Power All LEDs. This pin is enabled or disabled using the ENM and ENC inputs. A 2.2µF X5R or X7R ceramic capacitor should be connected to ground. ENM, ENC (Pins 3, 10): Inputs. The ENM and ENC pins are used to program the LED output currents. The ENC pin is strobed times to decrement the internal 3-bit DAC’s from full-scale to 1 LSB. The ENM pin is strobed 63 times to decrement the 6-bit DAC from full-scale to 1 LSB. The counters will stop at 1 LSB if the strobing continues. The pin must be held high after the final desired positive strobe edge and the data is transferred after a 150µs (typ) delay. Holding the ENM or ENC pin low will clear the coun- ter for the selected display and reset the LED current both inputs are held low for longer than 150µs (typ) the part will go into shutdown. The charge pump mode is reset to 1x whenever ENC goes low or when the part ...
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LTC3210-1 block Diagram 800kHz OSCILLATOR 15 V BAT – – 500 RM 8 ENM 3 50ns FILTER 250k + – 500 50ns FILTER ENC 250k operaTion Power Management The LTC3210-1 uses a switched capacitor charge pump to boost CPO to as much as 2 times the input voltage up to 5.1V. The part starts mode. In this mode connected directly to CPO. This mode provides maxi- mum efficiency and minimum noise. The LTC3210-1 will remain in 1x mode until an LED current source drops out. Dropout occurs when a current source voltage becomes ...
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LED Current Control The MLED currents are delivered by the four programmable current sources. 64 linear current settings (0mA to 20mA 30.1k) are available by strobing the ENM pin. Each positive strobe edge decrements a 6-bit down counter which controls a 6-bit linear DAC. When the desired cur- rent is achieved ENM is stopped high. The output current then changes to the programmed value after 150µs (typ). The counter will stop when the LSB is reached. The output current is set to 0 when ENM is toggled low after the output has been enabled. If strobing is started within 150µs (typ), after ENM has been set low, the counter will continue to count down. After 150µs (typ) the counter is reset. The CLED current is delivered by a programmable current source. Eight linear current settings (0mA to 380mA 24.3k) are available by strobing the ENC pin. Each posi- tive strobe edge decrements a 3-bit down counter which controls a 3-bit linear DAC. When the desired current is reached, ENC is stopped high. The output current then changes to the programmed value after 150µs (typ). The counter will stop when the LSB is reached. The output current is set to 0 when ENC is toggled low after the output has been enabled. If strobing is started within 150µs (typ) after ENC has been set low, the counter will continue to count down. After 150µs (typ) the counter is reset. The full-scale output current is calculated as follows: MLED full-scale output current ( ) = ...
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LTC3210-1 operaTion When the LTC3210-1 operates in either 1.5x mode or 2x mode, the charge pump can be modeled as a Thevenin- equivalent circuit to determine the amount of current available from the effective input voltage and effective open-loop output resistance, R (Figure 2 1. – BAT BAT Figure 2. Charge Pump Thevenin Equivalent Open-Loop Circuit ...
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Shutdown Current In shutdown mode all the circuitry is turned off and the LTC3210-1 draws a very low current from the V ply. Furthermore, CPO is weakly connected to V LTC3210-1 enters shutdown mode when both the ENM and ENC pins are brought low at 150µs (typ). ENM and ENC have 250k internal pull down resistors to define the shutdown state when the drivers are in a high imped- ance state. Thermal Protection The LTC3210-1 has built-in overtemperature protection. At internal die temperatures of around 150°C thermal shut down will occur. This will disable all of the current sources and charge pump until the die has cooled by about 15°C. This thermal cycling will continue until the fault has been corrected. applicaTions inFormaTion V , CPO Capacitor Selection BAT The style and value ...
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LTC3210-1 applicaTions inFormaTion the output charging phase but will drop to zero during the clock nonoverlap times. Since the nonoverlap time is small (~35ns), these missing “notches” will result in only a small perturbation on the input power supply line. Note that a higher ESR capacitor such as tantalum will have higher input noise due to the higher ESR. Therefore, ceramic capacitors are recommended for low ESR. Input noise can be further reduced by powering the LTC3210-1 through a very small series inductor, as shown in Figure 5. A 10nH inductor will reject the fast current notches, thereby presenting a nearly constant-current load to the input power supply. For economy, the 10nH inductor can be fabricated on the PC board with about 1cm (0.4" board trace. V BAT GND Figure 5. 10nH Inductor Used for Input Noise Reduction (Approximately 1cm of ...
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The flying capacitors must be placed close to the part. The traces from the pins to the capacitor pad should be as wide as possible. • CPO traces must be wide to minimize inductance BAT and handle high currents. • LED pads must be large and connected to other layers of metal to ensure proper heat sinking. • RM and RC pins are sensitive to noise and capacitance. The resistors should be placed near the part with mini- mum line width. Power Efficiency To calculate the power efficiency (η white LED driver chip, the LED power should be compared to the input power. The difference between these two numbers represents lost power whether the charge pump or the current sources. Stated mathematically, the power efficiency is given by: P LED η ...
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LTC3210-1 package DescripTion 3.50 0.05 1.45 0.05 (4 SIDES) 2.10 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. DRAWING ...
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... Rev D) REV DATE DESCRIPTION D 6/10 Removal of PDC package information from data sheet. LTC3210EPD-1 designated obsolete in Order Information section. 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC3210-1 PAGE NUMBER 32101fd ...
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... OUT(MAX 5.25V 28µA, I <1µA, DFN Package OUT(MAX 2.7V to 4.5V 2.5mA, I <6µA, IN(MAX 40V 1.2mA, I <1µA, ThinSOT™ Package OUT(MAX 40V 2µA, I <1µA DFN, TSSOP Packages OUT(MAX 0610 REV D • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2006 32101fd ...