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FAN5099EMTCX Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte FAN5099EMTCX
Spiegazioni elettronici  Wide Frequency Synchronous Buck PW & LDO Controller
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5099EMTCX Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5099 Rev. 1.1.5
May 2008
FAN5099 — Wide Frequency Synchronous Buck PWM
& LDO Controller
Features
General Purpose PWM Regulator and LDO Controller
Input Voltage Range: 3V to 24V
Output Voltage Range: 0.8V to 15V
VCC
– 5V
– Shunt Regulator for 12V Operation
Support for Ceramic Cap on PWM Output
Programmable Current Limit for PWM Output
Wide Programmable Switching Frequency Range
(50kHz to 600kHz)
RDS(ON) Current Sensing
Internal Synchronous Boot Diode
Soft-Start for both PWM and LDO
Multi-Fault Protection with Optional Auto-restart
16-Pin TSSOP Package
Applications
High-Efficiency (80+) Computer Power Supplies
PC/Server Motherboard Peripherals
– VCC_MCH (1.5V), VDDQ (1.5V) and
VTT_GTL (1.25V)
Power Supply for
– FPGA, DSP, Embedded Controllers, Graphic Card
Processor, and Communication Processors
High-Power DC-to-DC Converters
Related Application Notes
AN-6020 FAN5099 Component Calculation and
Simulation Tools
AN-6005 Synchronous Buck MOSFET Loss
Calculations with Excel Model
Description
The FAN5099 combines a high-efficiency pulse-width
modulated (PWM) controller and an LDO (low drop out)
linear regulator controller. The PWM controller is
designed to operate over a wide frequency range (50kHz
to 600kHz) to accommodate a variety of applications.
Synchronous rectification provides high efficiency over a
wide range of load currents. Efficiency is further
enhanced by using the low-side MOSFET’s RDS(ON) to
sense current. In addition, the capability to operate at low
switching frequencies provides opportunities to boost
power supply efficiency by reducing switching losses and
gain cost savings using low-cost materials, such as pow-
dered iron cores, on the output inductor.
Both the linear and PWM regulator soft-start are con-
trolled by a single external capacitor, to limit in rush cur-
rent from the supply when the regulators are first
enabled. Current limit for PWM is also programmable.
The FAN5099’s ability to handle wide input voltage
ranges makes this controller suitable for power solutions
in a wide range of applications involving conversion input
voltages from Silver box, battery, and adapters. The
PWM regulator employs a summing-current-mode con-
trol with external compensation to achieve fast load tran-
sient response and provide system design optimization.
FAN5099 is offered in both industrial temperature grade
(-40°C to +85°C) as well as commercial temperature
grade (-10°C to +85°C).
Ordering Information
All standard Fairchild Semiconductor products are RoHS compliant and many are also “GREEN” or going green. For Fairchild’s
definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Contact Fairchild sales for availability of other package options.
Part Number
Operating Temperature Range
Package
Packing Method
Qty/Reel
FAN5099MTCX
-10°C to +85°C
16-Lead TSSOP
Tape and Reel
2500
FAN5099EMTCX
-40°C to +85°C
16-Lead TSSOP
Tape and Reel
2500
FAN5099MX
-10°C to +85°C
16-Lead SOIC
Tape and Reel
2500
FAN5099EMX
-40°C to +85°C
16-Lead SOIC
Tape and Reel
2500


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