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Atmel LED Drivers

MSL1061/MSL1064

6-string PWM LED Driver with Digitally Compensated, 1.1MHz,

48V Boost Regulator, ±1.5% Current Balance, I

C Interface

Datasheet Brief

Summary of content (20 pages)

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Atmel LED Drivers MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface General Description The Atmel® LED DriversMSL1061 and MSL1064 are LED drivers with integrated boost regulators capable of driving six LED strings at 30mA up to 48V for lighting applications to 8W, allowing up to 72 LEDs per driver backlighting applications.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface Key Features • Drives 6 Strings of up to 12 LEDs per String • Individual Open-circuit and Short-circuit Fault Detection • Drives 72 White LEDs at 30mA for 8W Backlight • Faults Automatically Disable the Faulty String • Better than ±1.5% String-to-string Current Accuracy • Fault Reporting and Fault Reset Through I2C/SMB • 4.
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Quick Start Guide This section summarizes for quick evaluation the capabilities of, and differences between, the MSL1061 and MSL1064. The MSL1061 and MSL1064 are LED string drivers with integrated boost regulators, which power, monitor, and dim multiple LEDs at high efficiency for backlighting and signage applications. Each MSL1061/64 contains six outputs, each capable of sinking up to 30mA through a string of series-connected LEDs.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface Table 1. Atmel LED Drivers-MSL1061 and MSL1064 Comparison FEATURE I2C interface Package IPC2221A-2003 compliance MSL1061 MSL1064 APPLICATION AND SUITABILITY 4 selectable slave addresses by AD0 pin (0x60, 0x61, 0x62, 0x63) 1 fixed slave address (0x62) 28-lead, 5mm x 5mm TQFN, 0.5mm pitch 24-lead, 5mm x 5mm TQFN, 0.65mm pitch 0.
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Packages and Pin Connections VIN EN N/C SW SW N/C Atmel LED Drivers-MSL1061/64 – 24-pin, 5mm x 5mm x 0.75mm TQFN package with 0.65mm lead pitch 24 23 22 21 20 19 VCC 1 18 OVP VDD 2 17 STR0 TEST1 3 16 STR1 TEST2 4 MSL1064 15 STR2 SDA 5 (TOP VIEW) 14 STR3 SCL 6 Figure 1. 24-pin, 5mm x 5mm x 0.75mm TQFN (0.65mm pin pitch) with Exposed Pad 7 8 9 10 11 12 PWM FLTB OSC ILED IADJ STR5 13 STR4 Figure 2.
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Atmel LED Drivers-MSL1061/MSL1064 VIN EN SW SW SW SW N/C 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface 28 27 26 25 24 23 22 3 19 STR0 TEST2 4 MSL1061 18 STR1 SDA 5 (TOP VIEW) 17 STR2 SCL 6 16 STR3 AD0 7 15 STR4 8 9 10 11 12 13 14 STR5 TEST1 IADJ 20 TEST3 ILED 2 N/C VDD OSC 21 OVP FLTB 1 PWM VCC Figure 3. 28-pin, 5mm x 5mm x 0.75mm TQFN (0.5mm pin pitch) with Exposed Pad Figure 4.
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Pin Descriptions Table 3. Pin Assignments PIN NAME MSL1064 PIN DESCRIPTION VCC 1 1 6V internal linear regulator output VCC powers the internal power FET switch driver. Bypass VCC to GND either with a 10µF or greater ceramic capacitor, or with a 10µF or greater tantalum capacitor in parallel with a 1µF ceramic capacitor. If the voltage at VIN is less than 6.5V, connect VCC directly to VIN to bypass the internal linear regulator, and power the driver directly from VIN VDD 2 2 2.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface PIN NAME MSL1061 MSL1064 PIN DESCRIPTION IADJ 13 11 Analog LED current dimming input Apply a voltage between 0V to 1.22V to linearly control the LED current from 0 to 100%. Connect IADJ to VDD if unused STR5 14 12 LED string 5 current sink output Connect the cathode of LED String 5 to STR5.
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Absolute Maximum Ratings Voltage (With Respect to GND Exposed Pad on Package Underside) VIN.................................................................................................................................................................................................................. -0.3V to +40V VCC, EN.............................................................................................................................................................................................
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface Electrical Characteristics (Circuit of Figure 6, VVIN = 12V, default register settings of Table 7, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C) (Note 1) PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT DC ELECTRICAL CHARACTERISTICS VIN operating supply voltage V VIN = V VCC 4.75 6.5 V VCC unconnected 6.
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PARAMETER EN logic input series resistance CONDITIONS AND NOTES MIN Between EN input package pin and internal Zener clamp EN logic input Zener clamp SCL, SDA, AD0, PWM logic high input voltage TYP kΩ 5.8 V 2 V 0.9 SDA, SCL, AD0 input capacitance 10 SDA output low voltage Sinking 6mA FLTB output low voltage Sinking 1mA pF V 0.2 V 10 µA TYP MAX UNIT 0.4 0.6 Ω 1.245 V 0.1 MIN V 0.4 IADJ, FLTB, PWM, SCL, SDA, AD0 leakage current CONDITIONS AND NOTES UNIT 10.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface PARAMETER SYMBOL CONDITIONS AND NOTES MIN TYP MAX UNIT 1000 kHz I²C SWITCHING CHARACTERISTICS SCL clock frequency 1/tSCL TOEN bit D1=0 in control register to disable bus timeout 0 TOEN bit D1=1 in control register to enable bus timeout 0.066 tTIMEOUT 15 tBUF 0.5 µs Repeated START condition hold time tHD:STA 0.
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Block Diagram The block diagram for the 28-pin MSL1061 is shown in Figure 5. The differences for the 24-pin MSL1064 are that the MSL1064 provides only two pins for SW instead of four pins on the MSL1061, and the AD0 pin is not pinned out but is instead bonded internally to SCL. The MSL1061 I2C slave address is selected using AD0 from one of the four address pairs, 0xC0/0xC1 - 0xC6/0xC7, whereas the MSL1064 I2C slave address is fixed at 0xC4/0xC5. Figure 5.
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Typical Application Circuit Figure 6. Backlight Example Driving 60 White LEDs 4.7 Table 4. Typ. Application Circuit Parameters PARAMETER Minimum input voltage Maximum input voltage (set by minimum LEDs string voltage) Table 5. Typ. Application Circuit Bill of Materials VALUE 4.
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Detailed Description The MSL1061/64 is an LED driver with integrated boost regulator for driving an array of LEDs with up to 8W of power. The I²C/SMB serial interface, logic controls, and fault management make the MSL1061/64 especially suited to drive up to 72 white LEDs for portable device backlighting. It is also ideal for industrial lighting and signage applications, and can, for example, drive a 6 string x 18 series LED array totaling 108 red LEDs (2.5V LED forward voltage drop).
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface Boost Regulator Components The boost regulator is internally compensated, includes an internal high voltage power switch, and requires only an inductor, rectifier, and bypass capacitors. The currentmode boost regulator operates in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM).
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Register Map Summary Control the MSL1061/64 through an I2C interface using nine registers (Table 6). The power-up defaults (Table 7) are such that an MSL1061/64 operates as a standalone LED driver if the I2C interface is not used. The Internal register addressing auto-increments through the register map allowing sequential reads or writes without needing to write separate addresses for each byte. Table 6.
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Atmel LED Drivers-MSL1061/MSL1064 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator, ±1.5% Current Balance, I2C Interface Register Map Power-up Defaults Table 7.
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Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1)(408) 441-0311 Fax: (+1)(408) 487-2600 www.atmel.com Atmel Asia Limited Unit 01-5 & 16, 19F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) 2245-6100 Fax: (+852) 2722-1369 Atmel Munich GmbH Business Campus Parkring 4 D-85748 Garching b. Munich GERMANY Tel: (+49) 89-31970-0 Fax: (+49) 89-3194621 Atmel Japan 9F, Tonetsu Shinkawa Bldg.