Charge Pump regulates up to 4 white LEDs.
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Press Release Summary:
Housed in a 4 x 4 mm QFN package, Model SP7683 generates regulated output current using 2 operating modes. At high input voltages, it functions as linear regulator, at low input voltages, it functions as 1.5x charge pump. Other features include input voltage range 2.7-5.5 V, 1.2 MHz switching frequency, PWM dimming control, and operating temperature range of -40 to +85°C. Unit is targeted for backlighting color displays in portable applications.
Original Press Release:
Sipex Introduces New Four-Channel Charge Pump Regulator LED Driver
SP7683 is a high efficiency charge pump which independently regulates up to four white LEDs.
(Milpitas, CA - December 2, 2004) - Sipex Corporation (NASDAQ: SIPX), a leading supplier of high performance, analog integrated circuits (ICs), further expands its family of LED drivers with the SP7683. This high efficiency charge pump independently regulates up to four white LEDs and is ideal for backlighting color displays in portable applications such as cell phones, digital cameras and PDAs.
The SP7683 can generate regulated output current using two 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. This dual-mode architecture in addition to low shutdown current enables greater efficiency, constant brightness and longer battery life.
The SP7683 provides a matched current source of up to 160mA total (40mA 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. 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.
SP7683 Key Features (Typical)
o 2.7V to 5.5V input voltage range
o Independently regulates up to 4 LEDS
o LEDs can be driven from the charge pump output
o 1X and 1.5X mode charge pump
o High efficiency operation
o 1.2MHz switching frequency
o Integrated LED current matching
o Programmable LED drive capability
o PWM dimming control
o Low 1uA shutdown current
o Soft-start limits inrush current
o Output overvoltage protection
o Thermal shutdown protection
o QFN (4mm x 4mm) package
o Lead (Pb) free package option "-L"
Pricing and Availability
The SP7683 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 SP7683 begins at $1.55 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.
