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The MBI6651 is a high efficiency, constant current and step-down DC/DC converter. It is designed to deliver constant current to light up high power LED with only 4 external components. With hysteretic PFM control scheme, MBI6651 improves the efficiency of light loading. The output current of MBI6651 can be programmed by an external resistor and LED dimming can be controlled via pulse width modulation (PWM) through DIM pin. In addition, the start-up function limits the inrush current while the power is switch on. The MBI6651 also features under voltage lock out (UVLO), over temperature protection, LED open-circuit protection and LED short-circuit protection to protect IC from being damaged.
Additionally, to ensure the system reliability, the MBI6651 builds thermal protection (TP) function inside. This function protects IC from overheating (165°C) in various application conditions. MBI6651 provides thermal-enhanced packages as well to handle power dissipation more efficiently.
MBI6651 is available in TO-252, SOT-23 and MSOP-8 packages.
MBI6651 Specification
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ItemsSpec.Content
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01TopologyBuck / Hysteretic PFM
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02Max. Output Current per Channel1A
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03Max. Sustaining Voltage40V
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04Supply Voltage6~36V
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05Switch on Resistance0.45Ω
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06Common Anode
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07Dimming MethodDigital
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08Protection - LED Open
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09Protection - LED Short
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10Protection - Thermal Shutdown
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11Protection - Start-Up
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12Protection - UVLO
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13Protection - OCP/OCL
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14Protection - Themal Fold-back
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15Protection - OTP Error FLAG
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16Protection - OCP Error FLAG
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17Soft Start-up
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18RoHS Compliant PackageTO252
MSOP8
SOT23 -
19Major ApplicationsMR11, MR16, flood light, PAR light, wall wash light, stage light, panel light, emergency lighting, street light, tunnel lighting, high power LED lighting, automotive lighting
