Preliminary Datasheet I6651
Oct. 2009, V1.00
Step-Down 1A LED Driver
Features
? Backward compatible with I 6650 in package Surface Mount Device
? 1A constant output current
? 96% efficiency @ input voltage 12V, 350mA,
? 9~36V input voltage range
? Hysteretic PFM improves efficiency at light loading
? Settable output current
GPSD: TO-252-5L
? Integrated power switch with 0.45ohm low Rds(on)
? Full protection : Thermal/UVLO/Start-Up/LED Open-/Short- Circuit Small Outline Transistor
? Only 4 external components required
Product Description
The I6651 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,I6651 improves the efficiency of light loading. The output
current of I6651 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 GST: SOT-23-6L
the power is switch on.The I6651 also features under voltage lock out
(UVLO), over temperature protection, LED open-circuited protection and
LED short-circuited protection to protect IC from being damaged. Mini Small Outline Package
Additionally, to ensure the system reliability, the I6651 builds thermal
protection (TP) function inside. This function protects IC from
overheating (165°C) in various application conditions. I6651 provides
thermalenhancedpackages as well to handle power dissipation more
efficiently. I6651 is available in TO-252, SOT23-6 and MSOP-8 packages.
Applications
? Signage and Decorative LED Lighting GMS: MSOP-8L-118mil
? Automotive LED Lighting
? High Power LED Lighting
? Constant Current Source
©Micro, Inc. 2009
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