ZMD AG has introduced the second wave of its
ZLED family of LED control solutions with two new low-voltage ICs designed for
battery-powered handheld devices. The ZLED7012 and ZLED7022
incorporate low-noise, constant-frequency charge pump dc/dc converters that can
efficiently drive up to four (ZLED7012) or six (ZLED7022) strings of LEDs. The
devices come in the ultra-small UTQFN package (2 x 2mm) and require three
external components for operation.
Click here for a product fact sheet.
Capable of operating
efficiently with dc voltage supplies ranging from 2.8 to 5.5V, the devices are useful
for small, battery-powered LED backlighting applications such as mobile phones,
PDAs, GPS and navigation systems. The devices can also be used for illumination
of digital photo frames, low voltage LED lighting fixtures as well as
general-purpose low-voltage industrial and consumer applications.
With the pulse count
control (PCC) serial digiĀtal input, designers can enable and disable the LEDs
and set the current level. The programmable current levels range from 1.8 to
20mA per LED channel. This simple, high-speed interface allows efficient
real-time manageĀment of LEDs via microcontrollers or control systems.
features include integrated soft-start circuitry to protect against excessive
in-rush current durĀing power-on and a low-current shutdown mode that reduces
quiescent current consumption to approximately 1Ī¼A. The ZLED7012
over a temperature of range of -40 to +85C.