供应ME2179 升压DC/DC控制器和转换器IC

升压DC/DC控制器和转换器IC

升压DC/DC控制器和转换器IC

升压DC/DC控制器和转换器IC

The ME2179 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an osillation circuit, an error amplifier, a phase compensation circuit, a timer latch short-circuit protection circuit, a PWM 1 PFM switching control circuit. With an external low-ON-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a high output current.

During light-load, ME2179 Series switches its operation to the PFM control by the PWM /PFM switching control circuit in order to prevent efficiency decline due to the IC operating current. Ceramic capacitors can be used for output capacitor.

  Features

Input voltage range: 1.8V to 5.5 V

Duty ratio: Builtin PWM/PFM switching control circuit 28% to 85%

oscillator frequency : 1 .2MHz

Reference voltage: 0.6 x (1土2%) V

Maximum output current: 2.0A typ. (VDD=3V, Vout=5.0V)

Soft start function: 8ms typ.

Low current consumption: 70μA typ. at switching

off

Shuldown function: Current consumption 1.0μA max. at shutdown

External parts: Inductor, diode, capacitor, transistor

Timer latch short-circuit protection circuit: .Selectable with 1 without short-circuit protection circuit for each product;

Settable delay time by external capacitor (in the product with short-circuit protection)

UVLO (under-voltage lockout) function: Selectable with UVLO for each product

  Typical Application

MP3 players, digital audio players

Digital cameras, GPS, wireless transceiver

Portable devices