LTC3207EUF-1#PBF

LTC3207/LTC3207-1 600mA Universal Multi-Output LED/CAM Driver FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION Low Noise, Multi-Mode Charge Pump (1x, 1.5x, 2x) Provides Up to 91% Efficiency Slew Limited Switching Reduces Conducted and Radiated Noise (EMI) Up to 600mA Total Output Current Twelve 28mA Universal Current Sources with 64-Step Linear Brightness Control 425mA CAM LED Current Source with 16-Step Linear Brightness Control and 2-Second High Current Safety Timer Independent On/Off, Brightness Level, Blinking and Gradation Control for Each Current Source Using 2-Wire I2CTM Interface Internal Current Reference Two I2C Addresses are Available (LTC3207 00110110, LTC3207-1 00110100) Configurable ENU Pin for Asynchronous LED On/Off Control Automatic or Forced Mode Switching Internal Soft-Start Limits Inrush Current Short-Circuit/Thermal Protection 4mm × 4mm 24-Pin QFN Plastic Package The LTC®3207/LTC3207-1 are highly integrated multi-display LED drivers. The device contains a high-efficiency, 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 five small ceramic capacitors to form a complete LED power supply and current controller. In addition there are two I2C addresses available. The display currents are set by an internal precision current reference. Independent dimming, On/Off, blinking and gradation control for all universal current sources is achieved via the I2C serial interface. 6-bit linear DACs are available for adjusting brightness levels for each universal LED current source. The CAM current source has a 4-bit linear DAC to adjust brightness. The LTC3207/LTC3207-1 charge pumps optimize efficiency based on the voltage across the LED current sources. The device powers-up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The first dropout switches the IC into 1.5x mode and a subsequent dropout switches the LTC3207/LTC3207-1 into 2x mode. The device resets to 1x mode whenever a data register is updated via the I2C port. APPLICATIONS ■ Video Phones with QVGA+ Displays , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6411531. TYPICAL APPLICATION 4-LED MAIN, 2-LED SUB, Dual RGB and Camera Light C2 2.2µF VBAT C1 2.2µF DVCC C3 2.2µF MAIN C1P C1M C2P C2M VBAT CPO SUB RGB RGB CAM C4 4.7µF LTC3207/LTC3207-1 DVCC 0.1µF ULED1-12 I2 C ENABLE DISABLE LOW HI 2 SCL/SDA CAM ENU CAMHL 12 3207 TA01 GND 3207fc 1 LTC3207/LTC3207-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 4) C2M C1M VBAT ENU C2P C1P TOP VIEW 24 23 22 21 20 19 CPO 1 18 ULED12 ULED1 2 17 ULED11 ULED2 3 16 ULED10 25 ULED3 4 15 ULED9 ULED4 5 14 ULED8 ULED5 6 ULED6 DVCC SDA 9 10 11 12 SCL 8 CAM 13 ULED7 7 CAMHL VBAT, DVCC, CPO ........................................... –0.3V to 6V ULED1 to ULED12, CAM .............................. –0.3V to 6V SDA, SCL, ENU, CAMHL .............–0.3V to (DVCC + 0.3V) ICPO Continuous (Note 3) ........................................350mA Pulsed at 10% Duty Cycle ................................600mA ICAM Continuous (Note 3) ........................................300mA Pulsed at 10% Duty Cycle ................................460mA CPO Short-Circuit Duration .............................. Indefinite Operating Temperature Range (Note 2).... –40°C to 85°C Storage Temperature Range................... –65°C to 125°C UF PACKAGE 24-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 40°C/W EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3207EUF#PBF LTC3207EUF#TRPBF 3207 24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C LTC3207EUF-1#PBF LTC3207EUF-1#TRPBF 32071 24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C 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 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBAT = 3.6V, DVCC = 3V, ENU = Hi, CAMHL = LO, C1 = C2 = C3 = 2.2µF, C4 = 4.7µF, unless otherwise noted. PARAMETER CONDITIONS ● VBAT Operating Voltage IVBAT Operating Current MIN 2.9 ICPO = 0, 1x Mode ICPO = 0, 1.5x Mode ICPO = 0, 2x Mode MAX 5.5 0.5 2.9 4.1 DVCC UVLO Threshold DVCC Operating Voltage TYP 1.5 VBAT UVLO Threshold V 5.5 1.5 VBAT Shutdown Current ● DVCC Shutdown Current ● 3.2 V mA mA mA 1 ● UNITS V V 7 µA 1 µA 31 mA Universal LED Current, 6-Bit Linear DACs, ULED = 1V Full-Scale LED Current Minimum (1LSB) LED Current ● 24.2 27.5 0.436 mA 3207fc 2 LTC3207/LTC3207-1 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBAT = 3.6V, DVCC = 3V, ENU = Hi, CAMHL = LO, C1 = C2 = C3 = 2.2µF, C4 = 4.7µF, unless otherwise noted. PARAMETER CONDITIONS LED Current Matching Any Two Outputs, 50% of FS LED Dropout Voltage MIN TYP MAX UNITS 2 % ILED = FS 180 mV Blink Rate Period REG15, D6 and D7 1.25 2.5 s s ULED Up/Down Gradation Times REG15, D4 and D5 0.24 ● 0.45 0.48 ● 0.9 0.96 ● VOL General Purpose Output Mode (GPO) 1.8 IOUT = 1mA, Single Output Enabled 7 s s s s s s mV CAM LED Current, 4-Bit Linear DAC, CAM = 1V Full-Scale LED Current 425 mA Minimum (1LSB) LED Current 29 mA LED Dropout Voltage ILED = FS 450 mV High Current Safety Timer High Current Mode 2.1 s Charge Pump (CPO) 1x Mode Output Impedance 0.6 Ω 1.5x Mode Output Impedance VBAT = 3V, VCPO = 4.2V (Note 5) 3.6 Ω 2x Mode Output Impedance VBAT = 3V, VCPO = 4.8V (Note 5) 4.1 Ω CPO Regulation Voltage 1.5x Mode, ICPO = 20mA 2x Mode, ICPO = 20mA 4.55 5.05 V V ● CLOCK Frequency 0.65 0.85 1.05 MHz SDA, SCL, ENU, CAMHL VIL ● VIH ● 0.7 • DVCC 0.3 • DVCC V V IIH SDA, SCL, ENU, CAMHL = DVCC ● –1 1 µA IIL SDA, SCL, ENU, CAMHL = 0V ● –1 1 µA VOL IPULLUP = 3mA ● 0.4 V 400 kHz 0.12 Digital Output Low (SDA) Serial Port Timing (Notes 6, 7) tSCL Clock Operating Frequency tBUF Bus Free Time Between Stop and Start Condition 1.3 µs tHD,STA Hold Time After (Repeated) Start Condition 0.6 µs tSU,STA Repeated Start Condition Setup Time 0.6 µs tSU,STO Stop Condition Setup Time 0.6 µs tHD,DAT(OUT) Output Data Hold Time tHD,DAT(IN) Input Data Hold Time 0 ns tSU,DAT Data Setup Time 100 ns tLOW Clock Low Period 1.3 µs tHIGH Clock High Period 0.6 µs 0 900 ns 3207fc 3 LTC3207/LTC3207-1 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBAT = 3.6V, DVCC = 3V, ENU = Hi, CAMHL = LO, C1 = C2 = C3 = 2.2µF, C4 = 4.7µF, unless otherwise noted. PARAMETER CONDITIONS MAX UNITS tf Clock Data Fall Time MIN 20 300 ns tr Clock Data Rise Time 20 300 ns tSP Spike Suppression Time 50 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3207E/LTC3207E-1 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C ambient operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Based on long term current density limitations. Assumes operating duty cycle of