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參數(shù)資料
| 型號： | FAN5355UC06X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING CONTROLLER, 3350 kHz SWITCHING FREQ-MAX, PBGA12 |
| 封裝： | 2.23 X 1.46 MM, 0.50 MM PITCH, WLCSP-12 |
| 文件頁數(shù)： | 1/26頁 |
| 文件大小： | 1762K |
| 代理商： | FAN5355UC06X |
May 2011
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5355 Rev. 1.0.7
FAN5355
—
1.1A
/
1
A
/
0.8A,
3
M
Hz
Digita
lly
Programmable
Regulator
FAN5355
1.1A / 1A / 0.8A, 3MHz Digitally Programmable Regulator
Features
93% Efficiency at 3MHz
800mA, 1A, or 1.1A Output Current
I2C-Compatible Interface up to 3.4Mbps
6-bit VOUT Programmable from 0.75V to 1.975V
2.7V to 5.5V Input Voltage Range
3MHz Fixed-Frequency Operation
Excellent Load and Line Transient Response
Small Size, 1H Inductor Solution
±2% PWM DC Voltage Accuracy
35ns Minimum On-Time
High-Efficiency, Low-Ripple, Light-Load PFM
Smooth Transition between PWM and PFM
37A Operating PFM Quiescent Current
Pin-Selectable or I2C Programmable Output Voltage
On-the-Fly External Clock Synchronization
10-lead MLP (3 x 3mm) or 12-bump CSP Packages
Applications
Cell Phones, Smart Phones
3G, WiFi, WiMAX, and WiBro Data Cards
Netbooks, Ultra-Mobile PCs
SmartReflex-Compliant Power Supply
Split Supply DSPs and P Solutions OMAP, XSCALE
Mobile Graphic Processors (NVIDIA, ATI)
LPDDR2 and Memory Modules
Description
The FAN5355 device is a high-frequency, ultra-fast transient
response,
synchronous
step-down
DC-DC
converter
optimized for low-power applications using small, low-cost
inductors and capacitors. The FAN5355 supports up to
800mA, 1A, or 1.1A load current.
The device is ideal for mobile phones and similar portable
applications powered by a single-cell Lithium-Ion battery. With
an output-voltage range adjustable via I
2C interface from
0.75V to 1.975V, the device supports low-voltage DSPs and
processors, core power supplies, and memory modules in
smart phones, PDAs, and handheld computers.
The FAN5355 operates at 3MHz (nominal) fixed switching
frequency using either its internal oscillator or external SYNC
frequency.
During light-load conditions, the regulator includes a PFM
mode to enhance light-load efficiency. The regulator
transitions smoothly between PWM and PFM modes with no
glitches on VOUT.
In hardware shutdown, the current
consumption is reduced to less than 200nA.
The serial interface is compatible with Fast/Standard and
High-Speed mode I
2C specifications, allowing transfers up to
3.4Mbps. This interface is used for dynamic voltage scaling
with 12.5mV voltage steps for reprogramming the mode of
operation (PFM or Forced PWM), or to disable/enable the
output voltage.
The chip's advanced protection features include short-circuit
protection and current and temperature limits. During a
sustained over-current event, the IC shuts down and restarts
after a delay to reduce average power dissipation into a fault.
During startup, the IC controls the output slew rate to minimize
input current and output overshoot at the end of soft start. The
IC maintains a consistent soft-start ramp, regardless of output
load during startup.
The FAN5355 is available in 10-lead MLP (3x3mm) and
12-bump WLCSP packages.
All trademarks are the property of their respective owners.
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