Description 

The Z CC2139 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  external low-ON-resistance Nch Power MOS,  this product is applicable to applications  requiring high efficiency and high output current.  The Z CC 2139 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

Feature Low voltage operation: Start-up is guaranteed  from 0.9 V(IOUT =1 mA )  Duty ratio: Built-in PWM/PFM switching control  circuit 15 to 78 % .  oscillator frequency：1.0MHz  External parts: coil, diode, capacitor, and  transistor  Output voltage range: 1.5V ~6.5 V  Output voltage accuracy：±2%  Soft start function: 2 mS.  PACKAGE：SOT23-5

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