High efficiency LED drive, four charge pump (Figure)

Sipex Corporation (NASDAQ: SIPX), is a high-performance, analog integrated circuit (Integrated circuits, ICs) really want suppliers. Launched a new LED drive family product SP6687. High efficiency charge pump independent control of 4 white LEDs this is the most ideal choice, backlight color display in portable applications such as mobile phone, digital camera, portable MP3 player and personal data assistant (PDAs).

SP6687 can use 3 different operating modules to produce regulated output current. In a high input voltage, it functions as a linear regulator. In the case of low output voltage, it functions like a 1.5X charge pump, which can increase the input voltage to maintain the forward current of desired LED. The third module allows it to operate as a 2X charge pump. The three - mode building also reduces the 1uA 's Lock - in current, resulting in greater efficiency, providing continuous brightness and extending battery life.

SP6687 accords with the current source of 120mA (each LED 30mA) as the current path. The LED current is programmable by the user by using a single external current fixed resistor that sets all LEDs current to approximately 440 times current through a fixed resistor. Brightness can be adjusted by changing the value of the fixed resistor or using a pulse regulator. This part is mainly associated with an integrated current sensing circuit, which does not require any external current of the resistor. Can work at 1MHz frequency. SP6687 (Sipex)

The main features of SP6687 (typical) - 4 LEDS independent pulse high efficiency operation dimmer - >90%, 95% - three peak efficiency mode charging efficiency of cross battery life and two dimmer control method to maintain the pump: PWM (DC) and DC voltage, low current, 1 A lock built-in soft start the dynamic and thermal protection, short circuit and output over-voltage protection and optimization of lithium ion battery, and SC604 pin compatible pricing and availability of SP6687 samples can now order. Operating at rated temperature of -40 DEG C to +85 DEG C by a 4mm x 4mmQFN package. SP6687 order quantity of 1000 pieces price is $1.09. Data sheets and additional instructions on the product and other Sipex products can be viewed on the company's website.

About Sipex: Sipex Corporation is a design, manufacture and sale of high-performance, analog analog integrated circuits (ICs) as one of the semiconductor company. Sipex offers a wide range of analog signal processing market interfaces, power management and optical memory ICs to the automotive industry, portable products, computer communications, wireless LAN market. The company is headquartered in Milpitas, California, with offices in Belgium, Canada, China, Germany, Japan, Taiwan and the United kingdom. Sipex direct sales of the company's products or distribution channels through the company's sales.