LTC3207 LINER [Linear Technology], LTC3207 Datasheet
LTC3207
Available stocks
Related parts for LTC3207
LTC3207 Summary of contents
Page 1
... LED drivers. The device contains a high-effi ciency, low-noise charge pump to provide power to 12 universal LED current sources and one camera LED current source. The LTC3207/ LTC3207-1 require only fi ve small ceramic capacitors to form a complete LED power supply and current controller. In addition there are two I The display currents are set by an internal precision cur- rent reference ...
Page 2
... TAPE AND REEL LTC3207EUF#PBF LTC3207EUF#TRPBF LTC3207EUF-1#PBF LTC3207EUF-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 ...
Page 3
... Bus Free Time Between Stop and Start Condition Hold Time After (Repeated) Start Condition Repeated Start Condition Setup Time Stop Condition Setup Time Output Data Hold Time Input Data Hold Time Data Setup Time Clock Low Period Clock High Period LTC3207/LTC3207-1 µ MIN TYP MAX UNITS 2 180 1.25 2 ...
Page 4
... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3207E/LTC3207E-1 are guaranteed to meet performance specifi cations from 0°C to 85°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 ...
Page 5
... CAM Pin Current vs CAM Pin Voltage 450 V = 3.6V BAT 400 350 300 250 200 150 100 50 0 600 0.0 0.2 0.4 0.6 0.8 CAM PIN VOLTAGE (V) LTC3207/LTC3207 25°C unless otherwise noted A Oscillator Frequency vs V Voltage BAT 875 T = –40°C A 850 825 T = 85°C A 800 775 500 2.9 3.3 3 ...
Page 6
... LTC3207/LTC3207-1 TYPICAL PERFORMANCE CHARACTERISTICS CAM Pin Dropout Voltage vs CAM Pin Current 500 V = 3.6V BAT 400 300 200 100 0 50 100 150 200 250 300 350 CAM PIN CURRENT (mA) 3207 G16 ULED Pin Dropout Voltage vs ULED Pin Current 180 V = 3.6V BAT 160 140 120 ...
Page 7
... CC 9 ENU 22 CAMHL 8 SDA 11 SCL 10 LTC3207/LTC3207-1 pacitor should be connected from C1P to C1M and C2P to C2M. V (Pin 21): Supply Voltage for the Entire Device. This BAT . If CC pin must be bypassed with a single 2.2µF low ESR ceramic capacitor. ENU (Pin 22): Input. Used to enable or disable the prese- ...
Page 8
... CPO. This mode BAT provides maximum effi ciency and minimum noise. The LTC3207/LTC3207-1 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 LTC3207/LTC3207-1 will switch into 1 ...
Page 9
... OPERATION Mode Switching The LTC3207/LTC3207-1 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 an active current source voltage becomes too low for the programmed current to be sup- plied. The mode change will not occur unless dropout has existed for approximately 400µ ...
Page 10
... The charge pump mode is reset to 1x after gradation completes ramping down. External Enable Control (ENU) The ENU pin can be used to enable or disable the LTC3207/ LTC3207-1 without reaccessing the I useful to indicate an incoming phone call without waking the micro-controller. ENU can be programmed to indepen- dently control all preselected displays ...
Page 11
... OPERATION The LTC3207/LTC3207-1 are receive-only (slave) devices. 2 There are two I C addresses available. The LTC3207 I address is 00110110 and the LTC3207 00110100. The I C address is the only difference between the LTC3207 and the LTC3207-1. Write Word Protocol Used by the LTC3207/LTC3207 ...
Page 12
... LTC3207/LTC3207-1 OPERATION REG0, Command Byte. Register Sub-Address = 0000 MSB D7 D6 CAMHL Reserved UP 0 Gradation counts down 1 Gradation counts up Quick write 0 Normal write to each register 1 Quick write, REG1 data is written to all twelve universal registers Force1p5 1 Forces charge pump into 1.5x mode 0 Enables mode logic to control mode charges based on dropout signal ...
Page 13
... Byte Format Each byte sent to the LTC3207/LTC3207-1 must be 8 bits long followed by an extra clock cycle for the Acknowledge bit to be returned by the LTC3207/LTC3207-1. The data should be sent to the device most signifi cant bit (MSB) fi rst. LTC3207/LTC3207-1 LOW BITS ...
Page 14
... This effectively forces the address bits long where the least signifi cant bit of the address the correct seven bit address is given but the R/W bit is 1, the LTC3207/ LTC3207-1 will not respond. Bus Write Operation ...
Page 15
... APPLICATIONS INFORMATION V , CPO Capacitor Selection BAT The style and value of the capacitors used with the LTC3207/ LTC3207-1 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 ...
Page 16
... LTC3207/LTC3207-1 (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 LTC3207/LTC3207-1 pins. For a high quality AC ground, it should be returned to a solid ground plane that extends all the way to the LTC3207/LTC3207-1. ...
Page 17
... LED currents. At moderate to high output power, the quiescent current of the LTC3207/LTC3207-1 is negligible and the expres- sion above is valid. Once dropout is detected at any the LED pin, the LTC3207/ LTC3207-1 enable the charge pump in 1.5x mode. LTC3207/LTC3207-1 In 1.5x boost mode, the effi ciency is similar to that of a linear regulator with an effective input voltage of 1 ...
Page 18
... LTC3207/LTC3207-1 TYPICAL APPLICATIONS 6-LED MAIN, 6-LED Fun Lights Plus Low/High Camera Light C2 C3 2.2µF 2.2µF C1P C1M C2P C2M V V CPO BAT BAT C1 2.2µF LTC3207/LTC3207 SCL/SDA ULED1- CAM 0.1µF ENU ENABLE DISABLE CAMHL LOW HI GND 18 MAIN C4 4.7µF 12 FUN LIGHTS ...
Page 19
... 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. LTC3207/LTC3207-1 UF Package 24-Lead Plastic QFN (4mm × 4mm) (Reference LTC DWG # 05-08-1697) 0.70 ± ...
Page 20
... LTC3207/LTC3207-1 TYPICAL APPLICATION C2 2.2µF C1P C1M C2P C2M V V BAT BAT C1 2.2µF LTC3207/LTC3207 SCL/SDA 0.1µF ENU ENABLE DISABLE CAMHL LOW HI GND RELATED PARTS PART DESCRIPTION NUMBER LTC3201 Low Noise, 1.7MHz Regulated Charge Pump White LED Driver LTC3202 Low Noise, 1 ...