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PDF FAN21SV04 Data sheet ( Hoja de datos )
| Número de pieza | FAN21SV04 | |
| Descripción | 24V Single-Input Integrated Synchronous Buck Regulator | |
| Fabricantes | Fairchild Semiconductor | |
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August 2009
FAN21SV04 — TinyBuck™ 4A, 24V Single-Input
Integrated Synchronous Buck Regulator
Features
Single-Supply Operation with 4A Output Current
Wide Input Range with Dual Supply: 3.0V to 24V
Wide Output Voltage Range: 0.8V to 80% VIN
Over 94% Peak Efficiency
1% Reference Accuracy Over Temperature
Fully Synchronous Operation with Integrated
Schottky Diode on Low-Side MOSFET Boosts
Efficiency
Single Supply Device for VIN > 6.5V – 24V
Programmable Frequency Operation (200-
600KHz)
Synchronizable to External Clock with
Master/Slave Provisions
Power-Good Signal
Accepts Ceramic Capacitors on Output
External Compensation for Flexible Design
Starts on Pre-Bias Outputs
Integrated Bootstrap Diode
Programmable Over-Current Protection
Under-Voltage, Over-Voltage, and Thermal-
www.DataSheet4SUh.cuotmdown Protections
5x6mm, 25-Pin, 3-Pad MLP Package
Applications
Servers & Telecom
Graphics Cards & Displays
Computing Systems
Set-Top Boxes & Game Consoles
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
1 page  
Electrical Characteristics
Recommended operating conditions and using the circuit shown in Figure 1, with VIN, VIN_Reg=12V, unless
otherwise noted.
Parameter
Conditions
Min. Typ. Max. Units
Power Supplies
Operating Current
(VIN+VIN_Reg)
VIN_Reg Operating Current
VIN_Reg Quiescent Current
VIN_Reg Standby Current
5V_Reg Output Voltage
VIN=12V, 5V_Reg Open, CLK Open,
fSW=500KHz, No Load
EN=High, 5V_Reg Open, CLK Open,
fSW=500KHz
EN=High, FB=0.9V
EN=0, VIN=12V
Internal VCC Regulator, No Load,
6.5V<VIN_Reg<24V
22 30 mA
11 mA
4 5 mA
1 mA
4.7 5.0 5.3 V
5V_Reg Max. Current Load VIN_Reg=12V
VIN_Reg UVLO Threshold
Rising VIN, VIN=VIN_Reg
Falling VIN, VIN=VIN_Reg
Reference
Reference Voltage measured
at FB (See Figure 4 for
Temperature Coefficient)
FAN21SV04MPX, TA=25°C
FAN21SV04EMPX, TA=25°C
794
795
Oscillator
Frequency
RT=50kΩ to GND (Master Mode)
RT=24kΩ to GND (Master Mode)
255
540
Frequency in Slave Mode
Compared to Master Mode
Minimum On Time (2)
RT=24 kΩ to 50kΩ to 5V_Reg
(Slave Mode)
-15
Duty Cycle
Ramp Amplitude,
Peak–to-Peak(2)
Minimum Off Time (2)
VIN=6.5V, fSW=600KHz
VIN=16V, 1.8VOUT, RT=30kΩ, RRAMP=200kΩ
Synchronization
www.DataShCeLeKt4UO.cuotpmut Pulse Width
CLK Output Sink Current
CLK Output Source Current
Master (RT to GND)
Master, VCLK=0.4V
Master, VCLK=2V
70
0.25
-2.5
CLK Input Pulse Width
CLK Input Source Current
CLK Input Threshold, Rising
Slave: VCLK > 2V
Slave: VCLK=1V
Slave
50
-230
1.73
Soft-Start
VOUT to Regulation (T0.8)
Fault Enable/SSOK (T1.0)
Frequency=500KHz
Error Amplifier
DC Gain (2)
Gain Bandwidth Product(2)
VIN_Reg > 6.5V
80
12
Output Voltage Swing (VCOMP)
Output Current, Sourcing
5V_Reg=5V, VCOMP=2.2V
0.4
1.5
Output Current, Sinking
FB Bias Current
5V_Reg=5V, VCOMP=1.2V
VFB=0.8V, TA=25°C
0.8
-850
Note:
2. Specifications guaranteed by design and characterization; not production tested.
5 mA
5.6 6.3 V
5V
800 806
mV
800 805
300
600
40
80
0.5
100
85
-200
1.83
2.5
3.1
85
15
2.2
1.2
-650
345
KHz
660
+15 %
65 ns
85 %
V
150 ns
100
0.35
-2.0
-170
1.93
ns
mA
mA
ns
µA
V
ms
ms
4.0
2.5
1.5
-450
dB
MHz
V
mA
mA
nA
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
Typical Performance Characteristics (Continued)
Typical operating characteristics using the Figure 10 circuit. VIN=12V unless otherwise specified.
VOUT, 1V/div
EN, 1V/div
CLK, 5V/div
PGOOD, 5V/div
VOUT, 100mv/div
IOUT, 2A/div
Figure 24. CLK and VOUT at Startup
VOUT, 1V/div
SW, 10V/div
Figure 25. Transient Response, 2-4A Load
EN, 2V/div
SW, 10V/div
www.DataSheet4U.com
Figure 26. Startup on Pre-Bias
VOUT, 1V/div
CLK, 5V/div
EN, 5V/div
PGOOD, 5V/div
Figure 28. Shutdown, 1A Load
Figure 27. Restart on Fault
CLK, 5V/div
SW, 5V/div
Figure 29. Slave (500KHz Free-Run to 600KHz
Synchronization)
© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FAN21SV04.PDF ] | |
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