The MAX1610/MAX1611 are fully integrated, highefficiency drivers for cold-cathode fluorescent lamps (CCFLs). They operate from a 4.5V to 26V power source. An on-board, high-switching-frequency power MOSFET reduces external component count and magnetics size. The MAX1610/MAX1611 protect against open or shorted lamps. The CCFL can be driven from an isolated transformer secondary winding to improve efficiency and avoid flicker at dim tube settings. Brightness is adjusted by scaling the lamp current, or by operating with a fixed lamp current and chopping the CCFL on and off at a rate faster than the eye can detect.
The MAX1610's digital inputs increment, decrement, or clear an internal, 5-bit up/down counter, which sets CCFL brightness. The MAX1611 uses a System Management Bus (SMBus) 2-wire serial interface to directly set CCFL brightness. Both devices include micropower shutdown and a linear regulator that eliminates the need for a separate logic supply. The digital interface remains active in shutdown, preserving the brightness setting.
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Notebook/Laptop ComputersPoint-of-Sale TerminalsPortable Medical EquipmentInstrument Displays
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Direct Digital Control of CCFL BrightnessLow Supply Current: 3mA Max Operating 20µA Max ShutdownLow-Voltage Operation, Down to 4.5VInternal 26V, 0.7W Power SwitchProtection Against Open or Shorted LampsSupports Isolated Transformer Secondary WindingSMBus Serial Interface (MAX1611)No Flicker at Low Brightness (internal 280Hz current chopping)High Power-to-Light EfficiencySelectable 290kHz/145kHz Switching FrequencyOscillator SYNC Input16-Pin Narrow SO Package
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BATT to GND............................................................-0.3V to 28V
BST to GND .............................................................-0.3V to 30V
BST to LX ..................................................................-0.3V to 6V
LX to GND ................................................-0.6V to (BATT + 0.3V)
VL to GND..................................................................-0.3V to 6V
CS, CSAV, CC, SYNC, REF, MINDAC,
SS, OTP to GND............................................-0.3V to (VL + 0.3V)
SHDN, UP, DN to GND................................................-0.3V to 6V
SMBSUS, SDA, SCL to GND ........................................-0.3V to 6V
BATT, LX Current ....................................................................1A
SDA Current ......................................................................50mA
VL Current .........................................................................50mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 8.70mW/°C above +70°C) .......................696mW
Operating Temperature Range
MAX1610CSE/MAX1611CSE................................0°C to +70°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Post a Buying Lead
Required Field 
