LM3434SQ

The LM3434SQ is an adaptive constant on-time DC/DC buck (step-down) constant current controller (a true current source). The device provides a constant current for illuminating high power LEDs. It is available in a low profile LLP-24 package.

The features of LM3434SQ can be summarized as:(1)Operating input voltage range of -9V to -30V w.r.t. LED anode; (2)Control inputs are referenced to the LED anode; (3)Output current greater than 6A; (4)Greater than 30kHz PWM frequency capable; (5)Negative output voltage capability allows LED anode to be tied directly to chassis for maximum heat sink efficacy; (6)No output capacitor required; (7)Up to 1MHz switching frequency; (8)Low IQ, 1mA typical; (9)Soft start; (10)Adaptive programmable ON time allows for constant ripple current; (11)LLP-24 package.

The absolute maximum ratings of LM3434SQ are:(1)VIN, EN, DIM, ADJ to CGND :-0.3V to +7V; (2)COMP, SS to VEE:-0.3V to +7V; (3)BST to HS:-0.3V to +7V; (4)VCC to VEE:-0.3V to +7.5V; (5)CGND, DIMR, CSP, CSN,TON to VEE:-0.3V to +33V; (6)HS to VEE:-0.3V to +33V; (7)LS to VEE:-0.3V to +0.3V; (8)HO output HS:-0.3V to BST+0.3V; (9)DIMO to DIMR:-0.3V to +7V; (10)LO output LS:-0.3V to VCC +0.3V; (11)BST2 to VEE:-0.3V to 40V; (12)Maximum Junction Temperature:150°C; (13)Power Dissipation:Internally Limited; (14)ESD Susceptibility,Human Body Model:2kV.

If you want to know more information such as the electrical characteristics about the LM3434SQ, please download the datasheet in www.seekic.com or www.chinaicmart.com .