FAIRCHILD FAN5361 User Guide
Summary
The FAN5361 is a high-performance, miniature synchronous buck regulator designed for mobile and low-power electronics requiring reliable fixed-frequency power conversion. It delivers up to 750mA output current with best-in-class efficiency (up to 92%) while maintaining an extremely low quiescent current of 35µA. This manual provides complete technical specifications, including operating modes, voltage ranges, and protection features necessary for integrating this regulator into devices such as smartphones, tablets, netbooks, data cards, and ultra-mobile PCs needing stable, ripple-free power.
Page 1 Text Content
5361 — 6M z, 600m / 750m yn ch ro s B ck R eg lato
June 2011
FAN5361 6MHz, 600m A / 750m A Synchronous Buck Regulator
Features Description 6MHz Fixed-Frequency Operation The FAN5361 is a 600m A or 750m A, step-down, switching voltage regulator that delivers a fixed output from a 2.3V to
35µA Typical Quiescent Current
5.5V input voltage supply. Using a proprietary architecture
Best-in-Class Load Transient Response
with synchronous rectification, the FAN5361 is capable of
Best-in-Class Efficiency
delivering a peak efficiency of 92%, while maintaining
600m A or 750m A Output Current Capability efficiency over 80% at load currents as low as 1m A. 2.3V to 5.5V Input Voltage Range
The regulator operates at a nominal fixed frequency of
1.0 to 1.90V Fixed Output Voltage
6MHz, which reduces the value of the external components
Low Ripple Light-Load PFM Mode to 470n H for the output inductor and 4.7µF for the output
Forced PWM and External Clock Synchronization capacitor. The PWM modulator can be synchronized to an external frequency source.
Internal Soft-Start Input Under-Voltage Lockout (UVLO) At moderate and light loads, pulse frequency modulation is
Thermal Shutdown and Overload Protection used to operate the device in power-save mode with a typical quiescent current of 35µA. Even with such a low
6-bump WLCSP, 0.4mm Pitch
quiescent current, the part exhibits excellent transient
6-pin 2 x 2mm UMLP
response during large load swings. At higher loads, the system automatically switches to fixed-frequency control,
Applications
operating at 6MHz. In shutdown mode, the supply current Cell Phones, Smart Phones drops below 1µA, reducing power consumption. For applications that require minimum ripple or fixed frequency,
Tablets, Netbooks®, Ultra-Mobile PCs
PFM mode can be disabled using the MODE pin.
3G, LTE, Wi MAX™, Wi Bro®, and Wi Fi® Data Cards
Gaming Devices, Digital Cameras DC/DC Micro Modules The FAN5361 is available in 6-bump, 0.4mm pitch, Wafer- Level Chip-Scale Package (WLCSP) and a 6-lead 2 x 2mm ultra-thin MLP package (UMLP).
Typical Applications
Figure 1. Typical Applications
All trademarks are the property of their respective owners.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5361 • Rev. 1.1.2
Page Summary Contents For FAIRCHILD FAN5361 User Guide
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 18 |
| File Size | 926.22 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
What input voltage range does the FAN5361 support?
The regulator operates within an input voltage range of 2.3V to 5.5V.
How can I force the device into PWM mode instead of PFM?
Apply a logic 1 signal to the MODE pin to keep the IC in forced PWM mode.
What are the maximum continuous current outputs for this regulator?
It supports 600mA or 750mA output currents.
Which types of devices can use the FAN5361 regulator as an application example?
Recommended applications include Cell Phones, tablets, netbooks, and data cards.