ME2139F Datasheet | Microne

Description The ME2139 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase pensation circuit, a PWM/PFM switching control circuit. With an external low-ON-resistance Nch Power MOS, this product is applicable to applications - - - - - - - Feature - Low voltage operation: Start-up is guaranteed from 0.9 V(IOUT =1 m A ) Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % . oscillator frequency：1.0MHz External transistor Output voltage range: 1.5V ~6.5 V Output voltage accuracy：±2% Soft start function: 2 m S. PACKAGE：SOT23-5 parts: coil, diode, capacitor, and requiring high efficiency and high output current. The ME2139 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under VÛmw`R- yÑb€ a light load and to prevent decline in the efficiency by IC operation current. Selection Guide w.goftech. Typical Application - - - MP3 players, digital audio players Digital cameras, GPS, wireless transceiver Portable devices V1.0 Page 1 of 11 N~- NãtÿmñW3^VÛmw`R- yÑb€g- PQl Sø Pin Configuration TYPE ME2139F POSFIX M5 PACKAGE SOT23-5 Tel: 0755-8398 3377 / 135 9011 2223 http://.gofotech. ME2139 FB FUNCTION Yes FEATURE Ext+FB SWICHING TRANSISTOR External Transistor CE FUNCTION Yes VDD FUNCTION Yes SOT-23-5 Pin information ME2139F Pin Number Pin Name SOT23-5 1 2 3 4 5 FB Feed Back voltage pin Function - Ñb y R ` w VÛm € IC power supply pin w.g m pin Shutdown o c . ch GND pin GND e t ofo External transistor connection pin V1.0 Page 2 of 11 N~- NãtÿmñW3^VÛmw`R- yÑb€g- PQl Sø Block Diagram Tel: 0755-8398 3377 / 135 9011 2223 http://.gofotech. ME2139 Absolute Maximum Rang PARAMETER VDD Pin Voltage EXT Pin Voltage CE Pin Voltage SYMBOL RATING -0.3～6.5 -0.3～VDD+0.3 -0.3～Vin+0.3 ±1000 250 -25~+85 -40~+125 UNIT V V V m A m W ℃...