LED Driver independently controls up to 4 white LEDs.
Share:
Press Release Summary:
Used for backlighting color displays in portable applications, SP6687 charge pump can generate regulated output current using 3 operating modes: linear regulator, 1.5x charge pump, or 2x charge pump. Architecture has 1 µA shutdown current and built-in soft start. Providing matched current source of up to 120 mA total for all channels, driver is designed with integrated current sense circuitry and operates at 1 MHz with 95% peak efficiency.
Original Press Release:
Sipex Introduces High Efficiency LED Driver, Four-Channel Charge Pump
(Milpitas, CA - March 21, 2005) - Sipex Corporation (NASDAQ: SIPX), a leading supplier of high performance, analog integrated circuits (ICs), further enhances its family of LED drivers with the SP6687. This high efficiency charge pump independently controls up to four white LEDs and is ideal for backlighting color displays in portable applications such as cell phones, digital cameras, portable MP3 players and PDAs.
The SP6687 can generate regulated output current using 3 distinct operating modes. At high input voltages, it functions as a linear regulator. At low input voltages, it functions as a 1.5X charge pump, boosting input voltage to maintain desired LED forward current. And a third mode allows it to operate as a 2X charge pump. This tri-mode architecture in addition to low 1uA shutdown current enables greater efficiency, constant brightness and longer battery life.
The SP6687 provides a matched current source of up to 120mA total (30mA per LED) for all channels. The LED current is user programmable by using a single external current set resistor, which sets the current for all LEDs at approximately 440 times the current through the set resistor. Brightness can be adjusted either by varying the value of the set resistor or by employing a PWM dimming scheme. Since the part is designed with integrated current sense circuitry, there is no external current sensing resistor required. The part operates at 1MHz frequency.
SP6687 Key Features (Typical)
o Independent PWM dimming of up to 4 LEDS
o High efficiency operation >90%, Peak efficiency of 95%
o Tri-mode charge pump maintains efficiency across battery life
o Two dimming control methods: PWM and DC voltage
o Low 1µA shutdown current
o Built in soft-start
o Thermal shutdown protection
o Short circuit and output over-voltage protection
o Optimized for Lithium Ion batteries
o Pin compatible to SC604
Pricing and Availability
The SP6687 samples are available now. The part is rated over the industrial temperature range of -40°C to +85°C and is housed in a 4mm x 4mm QFN package. Pricing for the SP6687 begins at $1.09 in 1000 piece quantities. Datasheets and additional information on this family and other Sipex product offerings may be found on the company web site at www.sipex.com.
About Sipex Power Management Product Lines
Power management ICs deliver key benefits to portable power and distributed power applications, providing better power efficiency, increased miniaturization and more power at lower voltage levels. This product group includes low dropout linear regulators, DC to DC switching regulators, LED drivers, PWM controllers, charge pumps, and microprocessor supervisors. Applications for the Sipex power products include personal computers and peripherals, battery powered hand-held devices such as PDAs and cellular telephones, and data communications products.
About Sipex
Sipex Corporation is a semiconductor company that designs, manufactures and markets high performance, value-added analog integrated circuits (ICs). Sipex serves the broad analog signal processing market with interface, power management and optical storage ICs for use in automotive, portable products, computing, communications, and networking infrastructure markets. The company is headquartered in Milpitas, CA with additional offices in Belgium, Canada, China, Germany, Japan, Taiwan and the UK. Sipex sells products direct and through its distribution channels. For more information about Sipex, visit www.sipex.com.
