ltc3210 Linear Technology Corporation, ltc3210 Datasheet
ltc3210
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ltc3210 Summary of contents
Page 1
... The charge pump optimizes effi ciency based on the volt- age across the LED current sources. The part powers mode and will automatically switch to boost mode whenever any enabled LED current source begins to en- ter dropout. The LTC3210 is available in a 3mm × 3mm 16-lead QFN package. MAIN CAM C4 2.2μ ...
Page 2
... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3210EUD#PBF LTC3210EUD#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 ...
Page 3
... Low Time to Shutdown (ENC and ENM = Low) Current Source Enable Time (ENC or ENM = High) (Note 5) Note 3: The LTC3210E is guaranteed to meet performance specifi cations from 0°C to 70°C. Specifi cations over the –40°C to 85°C ambient operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: 1.5x mode output impedance is defi ...
Page 4
... LTC3210 W U TYPICAL PERFOR A CE CHARACTERISTICS Dropout Time from Shutdown 2X CPO 1.5X 1V/DIV 1X EN 2V/DIV MODE RESET 500μs/DIV 3210 G01 2x CPO Ripple V = 3.6V BAT I = 200mA CPO C = 2.2μF CPO V CPO 20mV/DIV AC COUPLED 500ns/DIV 3210 G04 1.5x Mode CPO Voltage vs Load Current 4 2.2μF 4 ...
Page 5
... CLED Pin Current CPO vs CLED Pin Voltage 400 V 360 320 280 240 200 160 120 300 400 500 0 3210 G16 LTC3210 T = 25°C unless otherwise stated. A Oscillator Frequency vs V Voltage BAT 850 840 T = 25°C A 830 820 T = 85°C A 810 800 T = – ...
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... LTC3210 W U TYPICAL PERFOR A CE 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 ENM Strobe Pulses 3.6V BAT 33. NUMBER OF ENM STROBE PULSES ...
Page 7
... Pins. The RM and RC pins will servo to 1.2V. Resistors connected between each of these pins and GND are used to set the CLED and MLED current levels. Connecting a resistor 12k or less will cause the LTC3210 to enter overcurrent shutdown. CLED (Pin 11): Output. CLED is the CAM current source output ...
Page 8
... LTC3210 W BLOCK DIAGRA 800kHz OSCILLATOR 15 V BAT – – 500Ω ENM 3 250k + – 500Ω ENC 250k 8 C1P C1M C2P CHARGE PUMP 1.215V TIMER ENABLE MAIN 3- BIT 3- BIT DOWN EXPONENTIAL COUNTER DAC 1.215V TIMER SHUTDOWN TIMER ENABLE CAM ...
Page 9
... 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 LTC3210 will switch into 1.5x mode. The CPO voltage will then start to increase and will attempt to reach 1. ...
Page 10
... Table 1. Table 1. Charge Pump Output Regulation Voltages Charge Pump Mode 1.5x 2x When the LTC3210 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) ...
Page 11
... 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. Mode Switching The LTC3210 will automatically switch from 1x mode to 1.5x mode and subsequently to 2x mode whenever 3 ...
Page 12
... APPLICATIO S I FOR ATIO V , CPO Capacitor Selection BAT The style and value of the capacitors used with the LTC3210 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 ...
Page 13
... PCB runs. Magnetic fi elds can also be generated if the fl ying capacitors are not close to the LTC3210 (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 LTC3210 pins ...
Page 14
... P LED η The effi ciency of the LTC3210 depends upon the mode in which it is operating. Recall that the LTC3210 operates as a pass switch, connecting V BAT is detected at the LED pin. This feature provides the op- timum effi ciency available for a given input voltage and LED forward voltage. When it is operating as a switch, the effi ...
Page 15
... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC3210 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 ...
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... Boost Converter Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 3-LED MAIN, One LED Camera C2 C3 2.2μF C1M C2P C2M CPO C4 2.2μF LTC3210 MLED1 MLED2 MLED3 MLED4 DISABLED MLED4 CLED RC GND 24.3k 1% COMMENTS V : 1.6V to 18V 2.8V to 4.5V, V ...