5V input 1.5A 1.5MHz synchronous step-down DC/DC converter

ELM603GC is high efficiency 1.5A constant on-time (COT) controlled synchronous step-down DC/DC converter. It can operate with input voltage from 2.5V to 6.0V and provide output range from 0.6V to input level, thanks to its 100% duty cycle operation. The constant on-time control scheme simplifies loop compensation and offers excellent load transient response. ELM603GC operates at fixed 1.5MHz across entire load range. The high gain error amplifier in the control loop provides excellent load and line regulation. ELM603GC has cycle-by-cycle current limit and hiccup mode to protect over-load or short circuit fault conditions.
ELM603GC is available in low profile 6 leads DFN 2mm×2mm packages.

Proprietary fast transient constant on time architecture
stable with low ESR ceramic output capacitors
Thermal shutdown protection
Internal 1msec soft-start
Cycle-by-cycle current limit protection
Input under/over voltage lockout
Output discharging function in shutdown
Hiccup mode for short circuit and over-load protection
Output current1.5A
Wide input voltage range2.5V to 6.0V
Switching frequencyFixed 1.5MHz
Feedback voltage0.6V ±2%
Built-in power switches260mΩ/180mΩ
Maximum duty cycle100%
Solid-state and hard disk drives
WiFi RF modules
DC/DC micro modules
Smart phone and tablets

Absolute Maximum Ratings

Input voltageVin-0.3 to +6.5V
Output voltageVout+0.6 to VinV
SW pin voltageVsw-0.3 to Vin+0.3V
Dynamic Vsw(In 10ns duration)Vsw-2.0 to Vin+2.0V
The other pinsVother-0.3 to +6.5V
Power dissipationPd1300mW
Operating temperature rangeTop-40 to +85°C
Storage temperature rangeTstg-65 to +150°C
Junction temperature rangeTj-40 to +150°C
Thermal resistanceθja75°C/W
Thermal resistanceθjc20°C/W

Block diagram