LTC3207/LTC3207-1 600mA Universal Multi-Output LED/CAM Driver FEATURES
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DESCRIPTION
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.
, 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.
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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
APPLICATIONS
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Video Phones with QVGA+ Displays
TYPICAL APPLICATION
4-LED MAIN, 2-LED SUB, Dual RGB and Camera Light
C2 2.2µF C3 2.2µF
VBAT
C1 2.2µF
C1P C1M C2P C2M VBAT CPO LTC3207/LTC3207-1 DVCC C4 4.7µF
MAIN
SUB
RGB
RGB
CAM
DVCC 0.1µF
ULED1-12 I2 2 C SCL/SDA ENU CAMHL GND CAM
12
ENABLE DISABLE LOW HI
3207 TA01
3207fc
1
LTC3207/LTC3207-1 ABSOLUTE MAXIMUM RATINGS
(Notes 1, 4)
PIN CONFIGURATION
TOP VIEW VBAT C1M C2M 18 ULED12 17 ULED11 25 16 ULED10 15 ULED9 14 ULED8 13 ULED7 7 CAM 8 CAMHL 9 10 11 12 ULED6 DVCC SDA SCL ENU C1P CPO 1 ULED1 2 ULED2 3 ULED3 4 ULED4 5 ULED5 6 C2P
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
24 23 22 21 20 19
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 LTC3207EUF#PBF LTC3207EUF-1#PBF TAPE AND REEL LTC3207EUF#TRPBF LTC3207EUF-1#TRPBF PART MARKING 3207 32071 PACKAGE DESCRIPTION 24-Lead (4mm × 4mm) Plastic QFN 24-Lead (4mm × 4mm) Plastic QFN TEMPERATURE RANGE –40°C to 85°C –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
PARAMETER VBAT Operating Voltage IVBAT Operating Current CONDITIONS
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.
MIN
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TYP 0.5 2.9 4.1 1
MAX 5.5
UNITS V mA mA mA V
2.9
ICPO = 0, 1x Mode ICPO = 0, 1.5x Mode ICPO = 0, 2x Mode
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DVCC UVLO Threshold DVCC Operating Voltage VBAT UVLO Threshold VBAT Shutdown Current DVCC Shutdown Current Universal LED Current, 6-Bit Linear DACs, ULED = 1V Full-Scale LED Current Minimum (1LSB) LED Current
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1.5 1.5 3.2
5.5 7 1
V V µA µA mA mA
3207fc
24.2
27.5 0.436
31
2
LTC3207/LTC3207-1 ELECTRICAL CHARACTERISTICS
PARAMETER LED Current Matching LED Dropout Voltage Blink Rate Period ULED Up/Down Gradation Times CONDITIONS Any Two Outputs, 50% of FS ILED = FS REG15, D6 and D7 REG15, D4 and D5
● ●
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.
MIN TYP 2 180 1.25 2.5 0.24 0.45 0.48 0.9 0.96
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MAX
UNITS % mV s s s s s s s s mV mA mA mV s Ω Ω Ω V V
1.8 7 425 29
VOL General Purpose Output Mode (GPO) CAM LED Current, 4-Bit Linear DAC, CAM = 1V Full-Scale LED Current Minimum (1LSB) LED Current LED Dropout Voltage High Current Safety Timer Charge Pump (CPO) 1x Mode Output Impedance 1.5x Mode Output Impedance 2x Mode Output Impedance CPO Regulation Voltage CLOCK Frequency SDA, SCL, ENU, CAMHL VIL VIH IIH IIL VOL Digital Output Low (SDA) Serial Port Timing (Notes 6, 7) tSCL tBUF tHD,STA tSU,STA tSU,STO tHD,DAT(OUT) tHD,DAT(IN) tSU,DAT tLOW tHIGH
IOUT = 1mA, Single Output Enabled
ILED = FS High Current Mode
450 2.1 0.6
VBAT = 3V, VCPO = 4.2V (Note 5) VBAT = 3V, VCPO = 4.8V (Note 5) 1.5x Mode, ICPO = 20mA 2x Mode, ICPO = 20mA
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3.6 4.1 4.55 5.05 0.65 0.85 1.05 0.3 • DVCC 0.7 • DVCC –1 –1 0.12 1 1 0.4
MHz V V µA µA V
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SDA, SCL, ENU, CAMHL = DVCC SDA, SCL, ENU, CAMHL = 0V IPULLUP = 3mA
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Clock Operating Frequency 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 1.3 0.6 0.6 0.6 0 0 100 1.3 0.6
400
kHz µs µs µs µs
900
ns ns ns µs µs
3207fc
3
LTC3207/LTC3207-1 ELECTRICAL CHARACTERISTICS
PARAMETER tf tr tSP CONDITIONS Clock Data Fall Time Clock Data Rise Time Spike Suppression Time
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.
MIN 20 20 50 TYP MAX 300 300 UNITS ns ns ns
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
