3A 36V PWM step down DC/DC converter

ELM612DA is a of step-down switching regulator with PWM control, reference voltage source, oscillation circuit, error amplifier, internal PMOS, etc. ELM612DA provides low-ripple power, high efficiency, and excellent transient characteristics; PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. ELM612DA also contains error amplifier circuit as well as soft-start circuit that prevents overshoot at during startup. Internal enable function, over current protect function and short circuit protect function will reduce the operation frequency from 150kHz to 30kHz when overmuch current or short circuit occurs. Meanwhile, internal compensation block is able to minimize the quantity of required external component. With internal P-channel Power MOS, and externally connected coil, capacitor, and diode, ELM612DA is able to function as step-down switching regulator. By the small package of SOP-8, ELM612DA is capable of working as ideal power supply units for many devices while providing outstanding features such as low current consumption. Since this converter accommodates input voltage up to 36V, ELM612DA is also suitable for AC adapter applications.

Thermal shutdown protection
Short circuit protection
Built-in internal P-channel MOS
Input voltage5.5V to 36V
Output voltage0.8V to Vin
Output current3.0A
Duty ratio0% to 100%
Constant frequencyTyp.150kHz
PC motherboard
LCD monitor
Graphic card
DVD, Blu-ray player
Telecom equipment
ADSL modem
Printer and other peripheral equipment
Microcomputer power supply
Network power supply

Absolute Maximum Ratings

VIN power supply voltageVin-0.3 to +40V
Apply voltage to FBVfbGND-0.3 to VinV
Apply voltage to ENVenGND-0.3 to Vin+0.3V
Apply voltage to SWVswGND-0.3 to Vin+0.3V
Apply voltage to VCVcVin-20 to Vin+0.3V
Power dissipationPd1135 *
755 *
300 *
Operating temperature rangeTop-40 to +85°C
Storage temperature rangeTstg-65 to +150°C

Block diagram