Diodes Incorporated

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AP1603 (Not Recommended for New Design (NRND))

NRND = Not Recommended for New Design

Step-up DC-DC converter

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The AP1603 is a high efficiency step-up DC/DC converter for applications using as few as a single NiMH or Li-Ion battery cells. Only four external components are required to deliver a fixed output voltage of 3.3V. The AP1603 starts up from less than 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings optimized performance for applications with light output loading and low input voltages. The output ripple and noise are lower compared with the circuits operating in PSM mode. The PFM control circuit operating in 150KHz (max.) switching rate results in smaller passive components. The space saving SOT26 packages make the AP1603 an ideal choice of DC/DC converter for space conscious applications, like pagers, electronic cameras, and wireless microphones.


  • A Guaranteed Start-Up from less than 0.9 V
  • High Efficiency
  • Low Quiescent Current
  • Less Number of External Components needed
  • Low Ripple and Low Noise
  • Space Saving Lead Free Package: SOT26
  • Lead Free Finish/RoHS Compliant


  • Pagers
  • Cameras
  • Wireless Microphones
  • Pocket Organizers
  • Battery Backup Suppliers
  • Portable Instruments

Product Specifications

Product Parameters

MinimumInput Voltage (V) 0.9 V
MaximumInput Voltage (V) 5.5 V
Minimum Output Voltage (V) 2 V
Maximum Output Voltage (V) 5.5 V
HS RDS(ON) (mΩ) N/A mΩ
LS RDS(ON) (mΩ) 600 mΩ
Quiescent Current Typ (mA) 0.016 mA
Shutdown Current Typ (µA) 0.07 µA
Type Boost
Output Current (A) 0.2 A
Frequency Typ (Hz) 150K Hz
Efficiency (%) 90 %

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Technical Documents

Application Notes

Evaluation Board User Guides

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