Fairchild Fan5665 Product Specifications
Summary
The FAN5665 is a high-efficiency, adaptive 5V boosted DC/DC converter designed using switched capacitor technology. It reliably steps up voltage for an output range of 2.9V to 5.5V, supporting input voltages from 2.9V to 5.5V and delivering up to 30mA current. The accompanying manual provides comprehensive technical details, covering its built-in protection circuits (UVLO, SCP), low-noise operation, efficiency modes, power pin configuration, and application guidelines. This component is essential for embedded systems designers building portable electronics like cell phones, smart devices, and pocket PCs.
Page 1 Text Content
FA 5665 — igh-Efficiency, A daptive C harge Pum p 5V B oost
February 2008
FAN5665 High-Efficiency, Adaptive Charge Pump 5V Boost
Features Description
5V Fixed Output Voltage The FAN5665 is a 5V switched capacitor step-up DC/DC converter with an input voltage range from 2.9V
30m A Maximum Output Current
to 5.5V. Switch reconfiguration and fractional switching techniques are utilized to achieve high efficiency over
Built-in Charge Pump with Three Modes of
the entire input voltage range.
Operation: 1×, 1.5×, and 2×
Minimum External Components The FAN5665 includes built-in under-voltage lockout, short circuit, and thermal protection circuitry.
Flying Capacitors Only 0.22µF
The FAN5665 is available in an 8-bump 0.4mm pitch
Low-noise, Constant-frequency Operation (1.2MHz)
WLCSP package.
at Heavy Loads High-efficiency, Low-frequency Operation at Light Loads Low Quiescent Current
C1- GND EN
Up to 92% Efficiency
2.9V to 5.5V Input Voltage Range 0.22µF +2.9 to 5.5V
C1+ VIN
Soft-start for Limiting Inrush Current
Input Under-Voltage Lockout Protection (UVLO)
Short-Circuit Protection (SCP) VOUT C2+ C2-
Thermal Shutdown Protection (TSD)
8-bump 1.21 x 1.21mm, 0.4mm Pitch WLCSP C2
Applications USB I/O Supply Regulators
Figure 1. Typical Application
Cell Phones, Smart-Phones Pocket PCs PDA, DSC, PMP, and MP3 Players
Ordering Information
Part Number Operating Temperature Range Package Packing Method
FAN5665UCX -40°C to +85°C 8-Lead Wafer-Level Chip-Scale
Package (WLCSP), 1.21x1.21mm Tape and Reel
All packages are lead free per JEDEC: J-STD-020B standard.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5665 • Rev. 1.0.1
Page Summary Contents For Fairchild Fan5665 Product Specifications
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 15 |
| File Size | 709.46 KB |
| Published | May 28, 2026 |
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Frequently Asked Questions
What is the general operating voltage range for this converter?
The input voltage (VIN) operates from 2.9V to 5.5V, providing a fixed 5V output (VOUT).
What protection features does the FAN5665 include for reliable operation?
It includes built-in under-voltage lockout (UVLO), short circuit (SCP), and thermal shutdown protection (TSD) circuitry.
How much current can this device reliably supply?
The maximum rated output current is 30mA.
Is there a specific package or physical dimension to consider when designing with this IC?
It comes in an 8-bump WLCSP package, measuring 1.21 x 1.21mm.