The ET84501 is a fully-integrated synchronous boost converter with a 19mΩ main power switch and a 23mΩ rectifier switch. The device provides a high-efficiency and small-size power solution for portable equipment. The ET84501 features a wide input voltage range from 2.7V to 12V to support applications powered with single-cell or two-cell Lithium ion/polymer batteries. The ET84501 has 7A continuous switch current capability and provides output voltage up to 12.4V.
The ET84501 uses adaptive constant off-time peak current control topology to regulate the output voltage. In moderate to heavy load condition, the ET84501 works in the pulse width modulation (PWM) mode. In light load condition, the ET84501 works in the pulse frequency modulation (PFM) mode to improve the efficiency, while the ET84501 still works in the PWM mode to avoid application problems caused by low switching frequency. The switching frequency in PWM mode is adjustable from 200kHz to 2.2MHz. The ET84501 also implements a built-in 3ms soft start function and an adjustable peak switch current limit function. In addition, the device provides 13.0V output over-voltage protection, cycle-by-cycle over-current protection, and thermal shutdown protection.
Features
●Input Voltage Range: 2.7 to 12V
●Output Voltage Range: 4.5 to 12.4V
●Up to 90% Efficiency at VIN = 3.3V, VOUT = 9V, and IOUT = 2A
●Resistor-Programmable Peak Current Limit up to 11.5A for High Pulse Current
●Adjustable Switching Frequency: 200kHz to 2.2MHz
●3ms Built-in Soft Start Time
●PFM Operation Mode at Light Load
●Output Over-voltage Protection at 13.0V
●Cycle-by-Cycle Over-current Protection
●Thermal Shutdown
●2.00mm × 2.50mm UQFN11 Package
Applications
●Portable POS Terminal
●Bluetooth™ Speaker
●Quick Charge Power Bank
ET84501 is fully pin to pin with TPS61089 and SGM6611
