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FAN5361 — 6 MHz, 600 mA / 750 mA Synchronous Buck Regulator
February 2016
FAN5361
6 MHz, 600 mA / 750 mA Synchronous Buck Regulator
Features
6 MHz Fixed-Frequency Operation
35 µA Typical Quiescent Current
Best-in-Class Load Transient Response
Best-in-Class Efficiency
600 mA or 750 mA Output Current Capability
2.3 V to 5.5 V Input Voltage Range
1.0 to 1.90 V 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, 0.4 mm Pitch
6-pin 2 x 2 mm UMLP
Description
The FAN5361 is a 600 mA or 750 mA, step-down, switching
voltage regulator that delivers a fixed output from a 2.3 V to
5.5 V input voltage supply. 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 1 mA.
The regulator operates at a nominal fixed frequency of
6 MHz, which reduces the value of the external components
to 470 nH for the output inductor and 4.7 µF 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 35 µA. 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 6 MHz. In shutdown mode, the supply current
drops below 1 µA, 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, 0.4 mm pitch, Wafer-
Level Chip-Scale Package (WLCSP) and a 6-lead 2 x 2 mm
ultra-thin MLP package (UMLP).
Applications
Cell Phones, Smart Phones
Tablets, Netbooks , Ultra-Mobile PCs
3G, LTE, WiMAX™, WiBro , and WiFi Data Cards
Gaming Devices, Digital CamerasDC/DC Micro Modules
®
®
®
Typical Applications
MODE
L1
470nH
FB
4.7F
C
OUT
SW
A1
B1
C1
A2
B2
C2
VIN
EN
GND
C
IN
2.2F
FB
C
OUT
4.7F
L1
SW
1
2
3
(AGND)
6
5
4
GND
EN
470nH
MODE
VIN
C
IN
2.2F
Figure 1. Typical Applications
All trademarks are the property of their respective owners.
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Embedded System
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