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T6309B

Features: • Matched LED Current with Overvoltage Protection• Drives LEDs in series• Up to 85% Efficiency• Low 400mV Feedback Reference, Optional 1.19V Feedback Reference• Internal Current Limit 250mA• Under Voltage Lock Out Circuits• 0.1uA Low Shutdown Sup...

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SeekIC No. : 004511334 Detail

T6309B: Features: • Matched LED Current with Overvoltage Protection• Drives LEDs in series• Up to 85% Efficiency• Low 400mV Feedback Reference, Optional 1.19V Feedback Reference̶...

T6309B Data Sheet

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Part Number:
T6309B
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/21

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Product Details

Description



Features:

• Matched LED Current with Overvoltage Protection
• Drives LEDs in series
• Up to 85% Efficiency
• Low 400mV Feedback Reference, Optional 1.19V Feedback Reference
• Internal Current Limit 250mA
• Under Voltage Lock Out Circuits
• 0.1uA Low Shutdown Supply Current
• 6-pin SOT-23 Package
• ESD Human Body Mode Over 5KV


Application

· Cellular Phones
· Portable Communication Devices
· Handheld Electronics
· PDAs
· LED/Display Back Light Driver


Pinout

Connection Diagram


Specifications

Supply Voltage ......................... -0.3V to 5V
SW Pin Switch Voltage ...................  -0.3V to 20V
OVP Pin Overvoltage Protection ..............-0.3V to 20V
CE Pin Voltage ...................  -0.3V to (VDD+0.3V)
SW Pin Switch Current ....................... 250mA
Continuous power dissipation, PD @ TA = 25°C SOT-23-6 ..0.35W
Package Thermal Resistance SOT-23-6, JA .........150°C /W
Operating Juction Temperature .......... ........150°C
Operating temperature range ............. -40°C to +85°C
Storage temperature range, TSTG ..........-55°C to +150°C
Lead temperature (soldering, 10sec) ..............  260°C
ESD Human Body Mode .........................5KV


Description

The T6309B is a step-up DC/DC converter that drives LED with a constant current. The device can driver up to 3 series LEDs from a single-cell Li-Ion battery. Series connection of the LEDs provides constant LED current that results in uniform brightness.

The T6309B features a minimum off-time current-limited PFM control scheme. The LED current is set with an external sense resistor (Rs) and is regulated by the feedback pin (FB) that regulates the voltage across the sense resistor to 400mV (typ). The low 400mV feedback reference voltage reduces power loss and improves efficiency for LED driver applications. Optional 1.19V feedback reference is available for normal output voltage applications like LCD bias. Output overvoltage protection (OVP) is integrated to prevent damage in case of output open circuit condition (e.g. faulty LED). The OVP pin can monitor the output voltage and turn off the converter in the event of overvoltage condition. The T6309B is available in SOT- 23-6 packages.




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