FAN5361UC12X

FAN5361UC12X Datasheet

FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator

Part	Datasheet
FAN5361UC12X	FAN5361UC12X (pdf)

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FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator September 2008 FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator - 6MHz Fixed-Frequency Operation - 35µA Typical Quiescent Current - Best-in-Class Load Transient - 600mA Output Current Capability - 2.3V to 5.5V Input Voltage Range - to 1.82V Fixed Output Voltage - Low Ripple Light-Load PFM Mode - Forced PWM and External Clock Synchronization - Internal Soft-Start - Input Under-Voltage Lockout UVLO - Thermal Shutdown and Overload Protection - 6-bump WLCSP, 0.4mm Pitch - 6-pin 2 x 2mm UMLP - Cell Phones - Portable Media Players - WLAN, 3G, and 4G Data Cards The FAN5361 is a 600mA, step-down, switching voltage regulator that delivers a fixed output from an input voltage supply of 2.3V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN5361 is capable of delivering a peak efficiency of 92%, while maintaining efficiency over 80% at load currents as low as 1mA. The regulator operates at a nominal fixed frequency of 6MHz, which reduces the value of the external components to 470nH for the output inductor and 4.7µF for the output capacitor. The PWM modulator can be synchronized to an external frequency source. At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 35µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control, operating at 6MHz. In shutdown mode, the supply current drops below 1µA, reducing power consumption. For applications that require minimum ripple or fixed frequency, PFM mode can be disabled using the MODE pin. The FAN5361 is available in 6-bump, 0.4mm pitch, WaferLevel Chip-Scale Package WLCSP and a 6-lead 2 x 2mm ultra-thin MLP package. MODE A1 L1 SW B1 470nH FB C1 COUT A2 VIN B2 EN C2 GND CIN F Figure Typical Applications FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator Ordering Information FAN5361UC10X 2 FAN5361UC12X FAN5361UC13X 2 FAN5361UC15X 2 FAN5361UC18X 2 FAN5361UC182X FAN5361UMP10X 2 FAN5361UMP12X 2 FAN5361UMP13X 2 FAN5361UMP15X 2 FAN5361UMP18X 2 Output Voltage 1 1.0V 1.2V 1.3V 1.5V 1.8V 1.82V 1.0V 1.2V 1.3V 1.5V 1.8V Package WLCSP-6 0.4mm Pitch 6 Lead UMLP 2 x 2mm Eco Status Temperature Range Packing Green to +85°C Tape and Reel to +85°C Tape and Reel For Fairchild’s definition of “green” Eco Status, please visit: Notes Other voltage options available on request. Contact a Fairchild representative. Preliminary release. Pin Configuration MODE A1 A2 VIN SW B1 B2 EN FB C1 C2 GND Figure WLCSP, Bumps Facing Down VIN A2 A1 MODE EN B2 B1 SW GND C2 C1 FB Figure WLCSP, Bumps Facing Up Figure UMLP, Leads Facing Down Pin Definitions Pin # Name Description WLCSP MLP MODE. Logic 1 on this pin forces the IC to stay in PWM mode. A logic 0 allows the IC to automatically 3 MODE switch to PFM during light loads. The regulator also synchronizes its switching frequency to four times the frequency provided on this pin. Do not leave this pin floating. 2 SW Switching Node. Connect to output inductor. 1 FB Feedback / VOUT. Connect to output voltage. 6 GND Ground. Power and IC ground. All signals are referenced to this pin. Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating. 4 VIN Input Voltage. Connect to input power source. 2008 Fairchild Semiconductor Corporation FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter VIN Input Voltage VSW Voltage on SW Pin VCTRL EN and MODE Pin Voltage Other Pins Electrostatic Discharge Protection Level

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FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator

September 2008

FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator
- 6MHz Fixed-Frequency Operation - 35µA Typical Quiescent Current - Best-in-Class Load Transient - 600mA Output Current Capability - 2.3V to 5.5V Input Voltage Range - to 1.82V Fixed Output Voltage - Low Ripple Light-Load PFM Mode - Forced PWM and External Clock Synchronization - Internal Soft-Start - Input Under-Voltage Lockout UVLO - Thermal Shutdown and Overload Protection - 6-bump WLCSP, 0.4mm Pitch - 6-pin 2 x 2mm UMLP
- Cell Phones - Portable Media Players - WLAN, 3G, and 4G Data Cards

The FAN5361 is a 600mA, step-down, switching voltage regulator that delivers a fixed output from an input voltage supply of 2.3V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN5361 is capable of delivering a peak efficiency of 92%, while maintaining efficiency over 80% at load currents as low as 1mA.

The regulator operates at a nominal fixed frequency of 6MHz, which reduces the value of the external components to 470nH for the output inductor and 4.7µF for the output capacitor. The PWM modulator can be synchronized to an external frequency source.

At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 35µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control, operating at 6MHz. In shutdown mode, the supply current drops below 1µA, reducing power consumption. For applications that require minimum ripple or fixed frequency, PFM mode can be disabled using the MODE pin.

The FAN5361 is available in 6-bump, 0.4mm pitch, WaferLevel Chip-Scale Package WLCSP and a 6-lead 2 x 2mm ultra-thin MLP package.

MODE A1

L1 SW B1 470nH

FB C1 COUT

A2 VIN B2 EN C2 GND

CIN F

Figure Typical Applications

FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator
Ordering Information

FAN5361UC10X 2

FAN5361UC12X FAN5361UC13X 2 FAN5361UC15X 2 FAN5361UC18X 2

FAN5361UC182X FAN5361UMP10X 2 FAN5361UMP12X 2 FAN5361UMP13X 2 FAN5361UMP15X 2 FAN5361UMP18X 2

Output Voltage 1
1.0V 1.2V 1.3V 1.5V 1.8V 1.82V 1.0V 1.2V 1.3V 1.5V 1.8V

Package WLCSP-6 0.4mm Pitch 6 Lead UMLP 2 x 2mm

Eco Status Temperature Range Packing

Green
to +85°C

Tape and Reel
to +85°C

Tape and Reel

For Fairchild’s definition of “green” Eco Status, please visit:

Notes Other voltage options available on request. Contact a Fairchild representative. Preliminary release.

Pin Configuration

MODE A1 A2 VIN SW B1 B2 EN FB C1 C2 GND

Figure WLCSP, Bumps Facing Down

VIN A2 A1 MODE EN B2 B1 SW GND C2 C1 FB Figure WLCSP, Bumps Facing Up

Figure UMLP, Leads Facing Down

Pin Definitions

Pin # Name Description

WLCSP MLP

MODE. Logic 1 on this pin forces the IC to stay in PWM mode. A logic 0 allows the IC to automatically
3 MODE switch to PFM during light loads. The regulator also synchronizes its switching frequency to four times
the frequency provided on this pin. Do not leave this pin floating.
2 SW Switching Node. Connect to output inductor.
1 FB Feedback / VOUT. Connect to output voltage.
6 GND Ground. Power and IC ground. All signals are referenced to this pin.

Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V. Do not leave this pin floating.
4 VIN Input Voltage. Connect to input power source.
2008 Fairchild Semiconductor Corporation

FAN5361 6MHz, 600mA TinyBuck Synchronous Buck Regulator

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter

VIN Input Voltage

VSW Voltage on SW Pin

VCTRL EN and MODE Pin Voltage

Other Pins

Electrostatic Discharge Protection Level

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Datasheet ID: FAN5361UC12X 513938