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FAN21SV04のメーカーはFairchild Semiconductorです、この部品の機能は「24V Single-Input Integrated Synchronous Buck Regulator」です。 |
部品番号 | FAN21SV04 |
| |
部品説明 | 24V Single-Input Integrated Synchronous Buck Regulator | ||
メーカ | Fairchild Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとFAN21SV04ダウンロード(pdfファイル)リンクがあります。 Total 18 pages
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 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
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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
3Pages Electrical Characteristics (Continued)
Recommended operating conditions and using the circuit shown in Figure 1 with VIN, VIN_Reg=12V, unless
otherwise noted.
Parameter
Conditions
Control Functions
EN Threshold, Rising
EN Hysteresis
EN Pull-Up Resistance
VIN_Reg >6.5V
EN Discharge Current
Auto-Restart Mode, VIN_Reg>6.5V
FB OK Drive Resistance
PGOOD Low Threshold
PGOOD Low Voltage
PGOOD Leakage Current
Protection and Shutdown
FB < VREF, 2 Consecutive Clock Cycles(3)
FB > VREF, 2 Consecutive Clock Cycles(3)
IOUT < 2mA
VPGOOD=5V
Current Limit
RILIM open, fSW=500KHz, VOUT=1.8V,
RRAMP=200kΩ, 16 Consecutive Clock
Cycles(3)
ILIM Current
Over-Temperature Shutdown
Over-Temperature Hysteresis
Over-Voltage Threshold
Under-Voltage Shutdown
VIN_Reg > 6.5V, TA=25°C
Internal Temperature
2 Consecutive Clock Cycles(3)
16 Consecutive Clock Cycles(3)
Fault-Discharge Threshold Measured at FB pin
Fault-Discharge Hysteresis Measured at FB pin (VFB ~500mV)
Note:
3. Delay times are not tested in production. Guaranteed by design.
Min.
-14.0
+7.0
Typ. Max. Units
1.35
250
800
1
800
-11.0
+10.0
0.2
2.00
1000
-8.0
+13.5
0.4
1.0
V
mV
KΩ
µA
KΩ
%VREF
V
µA
5.5 6.5 7.5 A
-11 -10 -9 µA
+155
°C
+30 °C
110 115 120 %VOUT
68 73 78 %VOUT
250 mV
250 mV
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© 2009 Fairchild Semiconductor Corporation
FAN21SV04 • Rev. 1.0.1
6
www.fairchildsemi.com
6 Page | |||
ページ | 合計 : 18 ページ | ||
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PDF ダウンロード | [ FAN21SV04 データシート.PDF ] |
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部品番号 | 部品説明 | メーカ |
FAN21SV04 | 24V Single-Input Integrated Synchronous Buck Regulator | Fairchild Semiconductor |
FAN21SV06 | Integrated Synchronous Buck Regulator | Fairchild Semiconductor |