DatasheetsPDF.com

Buck Regulator. FAN21SV04 Datasheet

DatasheetsPDF.com

Buck Regulator. FAN21SV04 Datasheet
















FAN21SV04 Regulator. Datasheet pdf. Equivalent













Part

FAN21SV04

Description

24V Single-Input Integrated Synchronous Buck Regulator



Feature


FAN21SV04 — TinyBuck™ 4A, 24V Single -Input Integrated Synchronous Buck Regu lator August 2009 FAN21SV04 — TinyB uck™ 4A, 24V Single-Input Integrated Synchronous Buck Regulator Features ƒ Single-Supply Operation with 4A Output Current ƒ Wide Input Range with Dual S upply: 3.0V to 24V ƒ Wide Output Volta ge Range: 0.8V to 80% VIN ƒ Over 94% P eak Efficiency ƒ 1% Reference .
Manufacture

Fairchild Semiconductor

Datasheet
Download FAN21SV04 Datasheet


Fairchild Semiconductor FAN21SV04

FAN21SV04; Accuracy Over Temperature ƒ Fully Synch ronous Operation with Integrated Schott ky Diode on Low-Side MOSFET Boosts Effi ciency Description The FAN21SV04 TinyB uck™ is a highly efficient, small-foo tprint, programmable-frequency, 4A, int egrated synchronous buck regulator. FAN 21SV04 contains both synchronous MOSFET s and a controller/driver with optimize d interconnects in on.


Fairchild Semiconductor FAN21SV04

e package, which enables designers to so lve highcurrent requirements in a small area with minimal external components, thereby reducing cost. Onboard interna l 5V regulator enables single-supply op eration for input voltages >6.5V. The F AN21SV04 can be configured to drive mul tiple slave devices OR synchronize to a n external system clock. In slave mode, FAN21SV04 may be .


Fairchild Semiconductor FAN21SV04

set up to be free-running in the absence of a master clock signal. External com pensation, programmable switching frequ ency, and current-limit features allow for design optimization and flexibility . High-frequency operation allows for a ll-ceramic solutions. Fairchild’s adv anced BiCMOS power process, combined wi th low-RDS(ON) internal MOSFETs and a t hermally efficient M.





Part

FAN21SV04

Description

24V Single-Input Integrated Synchronous Buck Regulator



Feature


FAN21SV04 — TinyBuck™ 4A, 24V Single -Input Integrated Synchronous Buck Regu lator August 2009 FAN21SV04 — TinyB uck™ 4A, 24V Single-Input Integrated Synchronous Buck Regulator Features ƒ Single-Supply Operation with 4A Output Current ƒ Wide Input Range with Dual S upply: 3.0V to 24V ƒ Wide Output Volta ge Range: 0.8V to 80% VIN ƒ Over 94% P eak Efficiency ƒ 1% Reference .
Manufacture

Fairchild Semiconductor

Datasheet
Download FAN21SV04 Datasheet




 FAN21SV04
August 2009
FAN21SV04 — TinyBuck™ 4A, 24V Single-Input
Integrated Synchronous Buck Regulator
Features
ƒ Single-Supply Operation with 4A Output Current
ƒ Wide Input Range with Dual Supply: 3.0V to 24V
ƒ Wide Output Voltage Range: 0.8V to 80% VIN
ƒ Over 94% Peak Efficiency
ƒ 1% Reference Accuracy Over Temperature
ƒ Fully Synchronous Operation with Integrated
Schottky Diode on Low-Side MOSFET Boosts
Efficiency
ƒ Single Supply Device for VIN > 6.5V – 24V
ƒ Programmable Frequency Operation (200-
600KHz)
ƒ Synchronizable to External Clock with
Master/Slave Provisions
ƒ Power-Good Signal
ƒ Accepts Ceramic Capacitors on Output
ƒ External Compensation for Flexible Design
ƒ Starts on Pre-Bias Outputs
ƒ Integrated Bootstrap Diode
ƒ Programmable Over-Current Protection
ƒ Under-Voltage, Over-Voltage, and Thermal-
www.DataSheet4SUh.cuotmdown Protections
ƒ 5x6mm, 25-Pin, 3-Pad MLP Package
Applications
ƒ Servers & Telecom
ƒ Graphics Cards & Displays
ƒ Computing Systems
ƒ Set-Top Boxes & Game Consoles
ƒ Point-of-Load Regulation
Description
The FAN21SV04 TinyBuck™ is a highly efficient,
small-footprint, programmable-frequency, 4A,
integrated synchronous buck regulator.
FAN21SV04 contains both synchronous MOSFETs
and a controller/driver with optimized interconnects in
one package, which enables designers to solve high-
current requirements in a small area with minimal
external components, thereby reducing cost. On-
board internal 5V regulator enables single-supply
operation for input voltages >6.5V.
The FAN21SV04 can be configured to drive multiple
slave devices OR synchronize to an external system
clock. In slave mode, FAN21SV04 may be set up to
be free-running in the absence of a master clock
signal.
External compensation, programmable switching
frequency, and current-limit features allow for design
optimization and flexibility. High-frequency operation
allows for all-ceramic solutions.
Fairchild’s advanced BiCMOS power process,
combined with low-RDS(ON) internal MOSFETs and a
thermally efficient MLP package, provide the ability to
dissipate high power in a small package. Integration
helps minimize critical inductances, making layout
simpler and more efficient compared to discrete
solutions.
Output over-voltage, under-voltage, over-current, and
thermal-shutdown protections help protect the device
from damage during fault conditions. FAN21SV04
prevents pre-biased output discharge during startup
in point-of-load applications.
Related Application Notes
AN-8022 — TinyCalc™ Calculator
Ordering Information
Operating
Eco
Part Number Temperature Range Status
Package
Packing
Method
FAN21SV04MPX
FAN21SV04EMPX
-10°C to 85°C
-40°C to 85°C
Green Molded Leadless Package (MLP) 5x6mm Tape and Reel
Green Molded Leadless Package (MLP) 5x6mm Tape and Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
www.fairchildsemi.com




 FAN21SV04
Typical Application Diagram
Block Diagram
www.DataSheet4U.com
Figure 1. Typical Application as Master at VIN=6.5V to 24V
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
Figure 2. Block Diagram
2
www.fairchildsemi.com




 FAN21SV04
Pin Configuration
Figure 3. MLP 5x6mm Pin Configuration (Bottom View)
Pad / Pin Definitions
Pad / Pin Name Description
P1, 6-12
P2, 3-5
P3, 21-23
SW
VIN
PGND
Switching Node. Junction of high-side and low-side MOSFETs.
Power Conversion Input Voltage. Connect to the main input power source.
Power Ground. Power return and Q2 source.
1
2
13
14
www.DataSheet4U.com
15
16
17
18
19
BOOT
VIN_Reg
PGOOD
EN
5V_Reg
AGND
ILIM
RT
FB
High-Side Drive BOOT Voltage. Connect through capacitor (CBOOT) to SW. The IC has an
internal synchronous bootstrap diode to recharge the capacitor on this pin to 5V_Reg when
SW is LOW.
Regulator Input Voltage. Input voltage to the internal regulator. Connect to input voltage
>6.5V with 10Ω resistor and a 1µF bypass capacitor at the pin (see Figure 10).
Power-Good. An open-drain output that pulls LOW when the voltage on the FB pin is
outside the specified limits. PGOOD does not assert HIGH until the fault latch is enabled
(see Figure 31).
ENABLE. Enables operation when pulled to logic HIGH or left open. Toggling EN resets the
regulator after a latched-fault condition. This input has an internal pull-up. When a latched
fault occurs, EN is discharged by a current sink.
5V Regulator Output. Internal regulator output that provides power for the IC’s logic and
analog circuitry. This pin should be connected to AGND through a >2.2µf X5R/X7R
capacitor.
Analog Ground. The signal ground for the IC. All internal control voltages are referred to
this pin. Tie this pin to the ground island/plane through the lowest impedance connection.
Current Limit. A resistor (RILIM) from this pin to AGND can be used to program the current-
limit trip threshold lower than the internal default setting.
Switching Frequency and Master/Slave Set. Connecting a resistor (RT) to AGND sets the
switching frequency and configures the CLK pin as an output (master). Tying this pin to
5V_Reg through a resistor configures the CLK signal as an input (slave) and establishes
the free-running switching frequency.
Output Voltage Feedback. Connect through a resistor divider to the output voltage.
20
COMP
Compensation. Error amplifier output. Connect the external compensation network
between this pin and FB.
Clock. Bi-directional signal pin, depending on master/slave configuration. When configured
24 CLK as a master, this pin represents the clock output that connects directly to the slave(s) for
synchronizing with 180° phase shift.
25
RAMP
Ramp Amplitude. A resistor (RRAMP) connected from this pin to VIN sets the internal ramp
amplitude and also provides voltage feedforward functionality.
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
3
www.fairchildsemi.com




Recommended third-party FAN21SV04 Datasheet







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)