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FAN53601 / FAN53611 — 6 MHz 600 mA / 1 A Synchronous Buck Regulator
October 2015
FAN53601 / FAN53611
6 MHz, 600 mA / 1 A Synchronous Buck Regulator
Features
600 mA or 1 A Output Current Capability
24 µA Typical Quiescent Current
6 MHz Fixed-Frequency Operation
Best-in-Class Load Transient Response
Best-in-Class Efficiency
2.3 V to 5.5 V Input Voltage Range
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
Optional Output Discharge
6-Bump WLCSP, 0.4 mm Pitch
Applications
3G, 4G, WiFi
®
, WiMAX™, and WiBro
®
Data Cards
Tablets
DSC, DVC
Netbooks
®
, Ultra-Mobile PCs
Description
The FAN53601/11 is a 6 MHz, step-down switching voltage
regulator, available in 600 mA or 1 A options, that delivers a
fixed output from an input voltage supply of 2.3 V to 5.5 V.
Using a proprietary architecture with synchronous
rectification, the FAN53601/11 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 as low as 470 nH for the output inductor and 4.7 µF for the
output capacitor. In addition, the Pulse Width Modulation
(PWM) modulator can be synchronized to an external
frequency source.
At moderate and light loads, Pulse Frequency Modulation
(PFM) is used to operate the device in Power-Save Mode
with a typical quiescent current of 24 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 FAN53601/11 is available in 6-bump, 0.4 mm pitch,
Wafer-Level Chip-Scale Package (WLCSP).
MODE
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