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ADD5207:  Four-String, White LED Driver for LCD Backlight Application

The ADD5207 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter tech-nology. It is designed with a 0.15 Ω, 1.5 A internal switch and a pin-adjustable operating frequency between 600 kHz and 1 MHz.

The ADD5207 contains four regulated current sources for uniform LED brightness. Each current source can drive up to 25 mA and the LED-driving current is pin adjustable by an external resistor. The ADD5207 drives up to four parallel strings of multiple series-connected LEDs with a ±1.5% current matching between strings.

The ADD5207 provides phase shift PWM brightness control methods. LED dimming control is achieved through the PWM input. The device includes an 8 kHz LED-dimming oscillator for driving each current source. The ADD5207 operates over an input voltage range of 6 V to 21 V, but the device can function with a voltage as low as 5.6 V.

The ADD5207 also has multiple safety protection features to prevent damage during fault conditions. If any LED is open, the device automatically disables the faulty current source. The internal soft start circuit prevents a high inrush current during startup. Thermal shutdown protection prevents thermal damage.

The ADD5207 is available in a low profile, thermally enhanced, 4 mm × 3 mm × 0.75 mm, 14-lead, RoHS-compliant lead frame chip scale package (LFCSP) and is specified over the industrial temperature range of −25°C to +85°C.

产品应用 Notebook PCs UMPCs, and monitor displays FEATURES and BENEFITS White LED driver based on inductive boost converter - Integrated 40 V MOSFET with 1.5 A peak current limit - Input voltage range: 6 V to 21 V - See data sheet for additional features Drives up to 4 LED current strings - LED current adjustable up to 25 mA for each channel - Headroom control to maximize efficiency - See data sheet for additional features Dimming controls - 4-channel operation: 90 degree phase shift between channels - 3-channel operation: 120 degree phase shift between channels General - Thermal shutdown - Undervoltage lockout - 14-lead, 4 mm × 3 mm LFCSP

Typical Application Circuit Diagram for ADD5207

ADD5207 产品订购信息

技术资料