Leadies launched LED flash / lamp driver

Leadis Technology Co. Ltd. (Leadis Technology Inc.) has recently announced that LDS8620 and LDS8621 can supply the product samples. The newly introduced 200 Ma dual inductor dual output LED flash / spot light driver uses a provincial bit of a 3 mm x 3 mm TQFN package, a high of 0.8 mm.

Leadies LED Driver Senior Director Adolfo Garcia said: "we recommend customers to use Seoul Semiconductor FCW301Z, LDS8620 or LDS8621 devices with our. LDS8620/21 no inductive boost converter by multiple model structure, with low forward voltage drop LED (VF) and high brightness, can simultaneously provide high performance and efficient scheme. "

LDS8620 and LDS8621 not only can use for portable lighting devices using lithium ion / polymer battery, can operate in a single lithium / manganese dioxide battery, 3 AA batteries and fixed power up to 5.5V under. In order to achieve 95% efficient operation, this series of products using multi mode boost converter can automatically from 1 times to 1.33 times and 1.5 times the mode and 2 times the mode, in order to maintain a fixed flashlight / full flash LED current mode. Due to the manufacturer's preset LED flash current of 96 MA / output, the use of external components has also been reduced to a minimum (with a low cost of 0.22 F switched capacitor, and a 2 F bypass capacitor of 1). LDS8620 and LDS8621 are the use of ultra low voltage PowerLite current regulator leadies patent technology, non inductive boost converter can be 1 times longer than under the mode of operation, and prolong battery life.

LDS8620 logic interface EN/SET interface uses the industry's common single circuit protocol to configure one or two LED [A/B] output, as well as set LED flashlight (or movie mode) or full flash operation. It has a built-in current control setting of up to 6 bits, providing a current resolution of 1.5 Ma LED, current from a range of 0.5 mA to 96 ma. Single circuit LED settings / control interface is very useful for folding mobile phone, because of their high power LED and LED driver in the opposite folding hub.

The design parameters of LDS8621 are basically the same as that of LDS8620. The difference is that the output setting and LED current are controlled by double circuit and double function logic interface. Its interface can provide IC control and PWM mode flash LED photometric control. The PWM1 input interface is responsible for controlling the LEDA output, while the PWM2 input interface is responsible for controlling the LEDB output operation. The input signals of PWM1 and PWM2 can be independently controlled, or are connected to the GPIO interface of the application / baseband processor.

Source: International Electronic Business