FAN5902MPX Fairchild Semiconductor, FAN5902MPX Datasheet

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FAN5902MPX

Manufacturer Part Number
FAN5902MPX
Description
IC CONV DC-DC 800MA RFPA 12-MLP
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of FAN5902MPX

Applications
Converter, 3G RF Power Amplifier
Voltage - Input
2.7 V ~ 5.5 V
Number Of Outputs
1
Voltage - Output
0.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-MLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2009 Fairchild Semiconductor Corporation
FAN5902 • Rev. 1.0.2.short
FAN5902
800mA Buck Converter for 3G RFPAs
Features
Applications
Ordering Information
Part Number
FAN5902MPX
FAN5902UCX
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
92% Efficient Synchronous Operation
2.7V to 5.5V Input Voltage Range
V
Up to 800mA Output Current
20µs Step Response
30µs Bypass Transition Time
50mΩ Integrated Bypass FET with Controlled Slew
Rate for Low Battery Voltage Operation
6MHz PWM Operation Allows 470nH Small Form
Factor Inductor
100% Duty Cycle for Low Dropout Operation
Thermal Shutdown
Input Under-Voltage Lockout
12-Lead MLP (0.8mm Maximum)
12-Bump WLCSP
Battery-Powered 3G RFPAs
Multiband/Multimode WCDMA/CDMA Handset RF
Transceivers
RF PC Cards
Pocket PC and PDAs with Communication
Capabilities
OUT
Range from 0.4V to 3.4V (or V
Temperature Range
-40 to +85°C
-40 to +85°C
Operating
IN
)
12-Lead, 3x3.5mm, Molded Leadless
Package (MLP)
12-Bump, Wafer-Level Chip-Scale
Package (WLCSP)
Package
Description
The
synchronous, step-down DC-to-DC converter designed
for powering the radio frequency power amplifiers
(RFPA) in 3G mobile handsets and other mobile
applications. It provides up to 800mA of output current
over an input voltage range of 2.7V to 5.5V. The output
voltage can be dynamically adjusted from 0.4V up to
3.4V, proportional to an analog input voltage ranging
from 0.2V to 1.7V provided by an external DAC. This
allows supplying the RFPA with the voltage level that
provides optimum Power Added Efficiency (PAE).
An integrated bypass FET automatically switches on
when the battery voltage drops too close to the output
voltage
transition is controlled by a slew rate controller to limit
the inrush current and reduce the RFPA gain deviation.
The FAN5902 offers fast transition times, allowing
changes to the output voltage in less than 20µs.
The FAN5902 operates at 6MHz, enabling the use of a
small, low-value inductor of 470nH. A current-mode
control loop with fast transient response ensures
excellent line and load regulation.
The FAN5902 improves the RFPA power efficiency and
increases the talk/connection time in 3G handsets.
The FAN5902 is available in a 12-lead MLP package
and 12-bump WLCSP.
Important
For
datasheet, please contact a Fairchild Semiconductor
sales representative.
FAN5902
complete
(when
is
V
performance
OUT
a
=V
Eco Status
BAT
high-efficiency,
RoHS
RoHS
-250mV).
specifications
Tape and Reel
Tape and Reel
The
May 2009
Packing
Method
www.fairchildsemi.com
low-noise,
bypass
and

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FAN5902MPX Summary of contents

Page 1

... RF PC Cards Pocket PC and PDAs with Communication Capabilities Ordering Information Operating Part Number Temperature Range FAN5902MPX -40 to +85°C FAN5902UCX -40 to +85°C For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2009 Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short Description ...

Page 2

... From Processor From External DAC 0603 BATT 2. 5.5V BPE VCON Base Process or © 2009 Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short PVIN VOUTSNS PVIN VOUTSNS AVIN FAN5902 BPE N SYNC EN VCON Figure 1. FAN5902 Circuit DCDC 50m Bypass Slew Controller Switcher Controller EN Reference Bandgap ...

Page 3

... AGND BPEN SYNC PGND SW PVIN (*) Pinout available upon request © 2009 Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short Description Analog ground, reference ground for the IC. Follow PCB routing notes for connecting this pin. Output voltage sense pin. Connect to V regulation. Enables switcher when HIGH, shutdown mode when LOW. This pin should not be left floating ...

Page 4

... Thermal Resistance, Junction-to-Ambient, measured according to JEDEC 2S2P PCB (and zero air flow). θ JEDEC 1S0P PCB (and zero air flow) = 210°C/W. 5. Maximum power dissipation is a function of T allowable ambient temperature is P © 2009 Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short Parameter (1) MLP Package ...

Page 5

... P OUT Figure 5. Comparison Current Consumption with and without FAN5902 Figure 7. Rise Times for 300mV, 500mV, and 2V Δ 2.2µF (V OUT © 2009 Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short 30 15 with FAN5902 BAT 15 30 [dBm] Figure 6. Comparison of RFPA Power Added Figure 8 ...

Page 6

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 7

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 8

... Fairchild Semiconductor Corporation FAN5902 • Rev. 1.0.2.short 8 www.fairchildsemi.com ...

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