Document
ETA1483
2A, 18V High Efficiency Synchronous Step-Down Converter
DESCRIPTION
The ETA1483 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to 2A of output current. Current mode PWM control allows the use of small external components, such as ceramic input and output caps, as well as small inductors, while still providing low output ripples. On top of the integrated internal synchronous rectifier that eliminates external Schottky diode, ETA1483 also employs a proprietary control scheme that switches the device into a power save mode during light load, thereby extending the range of high efficiency operation. Therefore, ETA1483 is a much superior solution in comparison to other competitions in terms of efficiency and cost. Cycle-by-cycle current limit provides output short-circuit protection and an input OVP function guards ETA1483 against possible input voltage surge. Overall, ETA1483 is a highly efficient and robust solution for DC-DC step-down applications that requires wide input ranges. ETA1483 is housed in a SOP8 Package.
FEATURES
Wide Input Operating Range from 4.5V to 18V High Efficiency:
Up to 90%at Light Load Up to 95% at Heavy Load Capable of Delivering 2A Input OVP at 20V No External Schottky Diode Needed Current Mode control 0.923V Reference for Low Output voltages Logic Control Shutdown Thermal shutdown and UVLO Available in SOP8
APPLICATIONS
LCD TVs Notebook computers FPGA power supplies LED drivers Car Charging Device
ORDERING INFORMATION
PART PACKAGE PIN
ETA1483
SOP8
TOP MARK ETA1483
TYPICAL APPLICATION
www.ETAsolution.com
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1
ETA1483
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
BST 1 IN 2 SW 3
GND 4
ETA1483
SOP8
8 SS 7 EN 6 COMP 5 FB
(Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.)
IN Voltage...............................................................-0.3V to 20V SW, EN Voltage……………………………………..–0.3V to VIN+0.3V BST Voltage…………………………………………………–0.3V to SW+6V FB Voltage………………………………………………………….–0.3V to 6V SW to ground current ………….…….……….......Internally limited Operating Temperature Range ……................…–40°C to 85°C Storage Temperature Range ………………..….–55°C to 150°C
ELECTRICAL CHACRACTERISTICS
(VIN = 12V, unless otherwise specified. Typical values are at TA = 25oC.)
PARAMETER
CONDITIONS
Input Voltage Range
Input UVLO
Rising, Hysteresis=100mV
Input Over voltage lockout
Input Supply Current Input Shutdown Current
VFB =0.85V
FB Feedback Voltage
FB Input Current
Error Amp Transconductance
Current Sense Transresistance
Switching Frequency
High side Switch On Resistance Low side Switch On Resistance High side Switch Current Limit
ISW =200mA ISW =200mA
SW Leakage Current EN Input Current
VIN=12V,VSW=0 or 12V, EN= GND
EN Input Low Voltage
Thermal S.