输出电压
(V)

频率
(kHz)

1、Features

• Regulated Output with Input Voltage Above,Below, or Equal to the Output.

• 1A Output Current at 3.3V in Step DownMode (VIN = 3.6V to 5.5V).

• Up to 800mA Output Current at 3.3V inBoost Mode (VIN > 2.8V).

• Single Inductor.2.5V to 5.5V Input Voltage Range.

• Fixed and Adjustable Output Voltage Optionsfrom 1.8V to 5.5V.

• Up to 95% Efficiency.

• Stable with Low ESR Ceramic Capacitors.

• No Schottky Diode Required.

• Output Disconnect in Shutdown.

• <1uA Shutdown Current.

• <65uA Quiescent Current.

• Power Saving Mode for Improved Light Effi-ciency Operation.

• Forced Fixed Frequency Operation Mode.

• Load Disconnect During Shutdown.

• Undervoltage Lockout Protection.

  
  

2、Applications

• All Three-Cell Alkaline, NiCd or NiMH or Sin-gle-Cell Li Battery

• MP3 Players

• Handheld Instruments

• Digital Cameras

• Smart Phones

• Portable GPS Units

• Miniature Hard Disk Drive Power

3、Description

The PL9001 is a 1.0A output, low-noise,pulse-width-modulated (PWM) buck-boost DC-DC converter that operates from input voltageabove, below, or equal to the output voltage.The device features two internal synchronousrectifiers for high efficiency; it requires no ex-ternal Schottky diode. Internally fixed-frequency 2.5MHz operation provides easypost-filtering and allows the use of small induc-tors and capacitors. At low load currents theconverter enters the Power Saving Mode tomaintain a high efficiency over a wide loadrange. The Power Saving Mode could be dis-abled, forcing PL9001 to operate atPWM mode. The PL9001 is ideally suited forsingle Li-Ion battery applications. It is alsouseful for three-cell alkaline, NiMH, or NiCdapplications. Shutdown mode places thedevice in standby, reducing quiescent supplycurrent to under 1μA.Other features of the PL9001 include internalsoft-start, internal compensation, short circuitprotection, current limit, and over temperatureprotection. The device is packaged in a 10-pinDFN package measuring 3 mm x 3 mm.