LTC3207-1_15 Datasheet, PDF (1/20 Pages) Linear Technology – 600mA Universal Multi-Output LED/CAM Driver

LTC3207/LTC3207-1
600mA Universal
Multi-Output LED/CAM Driver
FEATURES
■ _{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 I²C^TM Interface
■ _{Internal Current Reference}
■ _{Two I}²_{C 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
■ _{Video Phones with QVGA}⁺ _Displays
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 cur-
rent 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.
TYPICAL APPLICATION
4-LED MAIN, 2-LED SUB, Dual RGB and Camera Light
C2
2.2µF
C3
2.2µF
C1P C1M C2P C2M
V_BAT
C1
V_BAT
CPO
2.2µF _{LTC3207/LTC3207-1}
DV_CC
0.1µF
I²C
2
ENABLE DISABLE
DV_CC
12
ULED1-12
SCL/SDA
CAM
ENU
LOW HI
CAMHL _GND
C4
4.7µF
MAIN
SUB
RGB
RGB
CAM
3207 TA01
3207fc
1