MSL3086-IU Atmel, MSL3086-IU Datasheet - Page 12

• Manufacturer Part Number: MSL3086-IU
• Description: LED Lighting Drivers 8-Str LED Driver Internal Boost Cntr
• Manufacturer: Atmel

Specifications of MSL3086-IU

• Rohs: yes
• Input Voltage: 5 V
• Operating Frequency: 200 Hz
• Maximum Supply Current: 18 mA
• Output Current: 350 uA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: VQFN-24
• Minimum Operating Temperature: - 40 C
• Power Dissipation: 1850 mW

8.0 Detailed Description
The MSL3086/88 are LED drivers with eight internal current regulators capable of driving up to 60mA LED current each. The MSL3086/88
feature an integrated boost regulator controller to power the LED strings. They provide a complete LED driver solution for multi-LED string
applications. A single resistor sets the LED current for all strings. The MSL3086/88 support PWM LED dimming up to 4095:1 and feature
automatic phase shifted dimming, and dimming synchronized with external digital signals. The MSL3088 features independent frequency and
duty cycle control inputs. All devices feature optional register-set PWM dimming, fault and other controls via the I
information see the “MSL3040/50/60/80/86/87/88/89 Programming Guide”.
The MSL3086/88 include comprehensive fault monitoring and automatic fault handling. Automatic fault handling allows the MSL3086/88 to
operate without any microcontroller or FPGA, while control via I
applications.
The small 4x4mm VQFN package allows a small overall LED driver solution, while the high package power dissipation offers high output power
capability.
8.1 Differences between the MSL3086 and MSL3088
8.2 Operating the MSL3086/88
The MSL3086 requires only power and a single PWM input to set both the frequency and duty cycle of the LED drive signals, and
includes a boost converter controller. The MSL3088 accepts an additional SYNC signal that sets the frequency of the LED dimming
signals, while the PWM input sets the LED duty cycle. Similar devices are presented in Table 8.1 for comparison:
Table 8.1. LED Driver Comparison with Similar Parts
* Future product, contact factory for information.
** Drivers without phase shift allow parallel connection of string drive outputs for increased string current.
*** Drivers with separate SYNC input expect two control signals, one for dimming duty cycle and one for dimming frequency.
The MSL3086/88 are simple to operate; set up the boost regulator (see the section “Boost Regulator” beginning on page 17), set the
string on-current (see the section “Setting the LED Current” beginning on page 16), supply a PWM control signal to the PWM input
(MSL3088 requires a second control signal applied to the SYNC input), set the LED short circuit threshold voltage (see the section
“Setting the LED Short-Circuit Threshold” beginning on page 16), connect the LED strings and apply power (decoupled as instructed
in the section “Bypassing VIN and PVIN” beginning on page 16).
MSL3087*
MSL3040*
MSL3041*
MSL3050*
MSL3060*
MSL3086
MSL3088
MSL3080
PART
NUMBER
STRINGS
OF LED
4**
2**
1**
1**
3**
2**
1**
8
8
8
8
4
4
5
6
CURRENT
STRING
120mA
240mA
480mA
120mA
120mA
300mA
120mA
180mA
360mA
60mA
60mA
60mA
60mA
60mA
60mA
MAX
PER
SHIFTED
DRIVERS
STRING
PHASE
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
CONTROLLER
INTERNAL
BOOST
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
2
C allows customized fault handling and device control for more complex
8-String 60mA LED Drivers with Integrated Boost Controller and Phase Shifted Dimming
RESISTOR SET
THRESHOLD
LED SHORT
CIRCUIT
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
SEPARATE
INPUT***
SYNC
YES
YES
Atmel MSL3086/MSL3088 Datasheet
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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2
C serial interface; for interface
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