The LY9899 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. The LY9899 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.

  Features

Low voltage operation: Start-up is guaranteed from 0.9 V(louτ=1 mA)

Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 %.

oscillator frequency: 1 .0MHz

Output voltage range: 1.5V ~6.5 V

Output voltage accuracy: +2%

Soft start function: 2 mS.

PACKAGE: SOT23-5 SOT89-5 SOP-8

  Typical Application

MP3 players, digital audio players

Digital cameras, GPS, wireless transceiver

Portable devices

The LY9899 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. The LY9899 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.

  Features

Low voltage operation: Start-up is guaranteed from 0.9 V(louτ=1 mA)

Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 %.

oscillator frequency: 1 .0MHz

Output voltage range: 1.5V ~6.5 V

Output voltage accuracy: +2%

Soft start function: 2 mS.

PACKAGE: SOT23-5 SOT89-5 SOP-8

  Typical Application

MP3 players, digital audio players

Digital cameras, GPS, wireless transceiver

Portable devices

DC/DC升压IC

DC/DC升压IC

DC/DC升压IC DC/DC升压IC