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PDF FAN8303 Data sheet ( Hoja de datos )
| Número de pieza | FAN8303 | |
| Descripción | Non-Synchronous Step-Down DC/DC Regulator | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN8303 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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December 2008
FAN8303
2A 23V Non-Synchronous Step-Down DC/DC Regulator
Features
2A Output Current
0.22Ω Internal Power MOSFET Switch
Wide 5V to 23V Operating Input Range
Output Adjustable from 0.6 to 20V
Stable with Low ESR Output Ceramic Capacitors
Up to 90% Efficiency
Less than 40µA Shutdown Current
Fixed 370kHz Frequency
Thermal Shutdown with Hysteresis
Cycle-by-Cycle Over-Current Protection
Available in 8-Pin SOIC Package
Applications
Set-Top Box
DSL and Cable Modems
Distributed Power Systems
Consumer Appliances (DVD)
Auxiliary supplies
Description
The FAN8303 is a monolithic, non-synchronous, step-
down (buck) regulator with internal power MOSFETs. It
achieves 2A continuous output current over a wide input
supply range with excellent load and line regulation.
Current-mode operation provides fast transient
response and eases loop stabilization. Fault condition
protection includes cycle-by-cycle current limiting and
thermal shutdown. The regulator draws less than 40µA
shutdown current. FAN8303 requires a minimum
number of readily available standard external components.
External compensation, enable, and programmable
soft-start features allow design optimization and
flexibility. Cycle-by-cycle current limit, frequency
foldback, and thermal shutdown provide protection
against shorted outputs.
INPUT
5~23V
C IN
10 µF
ENABLE
SHUTDOWN
CSS
10 nF
CBS
10 nF
VIN BS
EN
FAN8303
SW
SS
GND
COMP
FB
RC
22 k
CC
1nF
CA
OPEN
L1
15 µ H
D1
R2
18 k
R3
5.6 k
OUTPUT
2.5V/2A
COU T
22 µF
Figure 1. Typical Application
Ordering Information
Part Number
FAN8303MX
Eco Status Operating Temperature Range
RoHS
-40°C to +85°C
Package
8-SOIC
Packing Method
Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.0.0
www.DataSheet.in
www.fairchildsemi.com
1 page  
Electrical Characteristics
VIN=12V, TA= -40 to +85°C, unless otherwise noted.
Symbol
VFB
RON_H
RON_L
ILKG
IPK
fOSC
VUVLO
fSHORT
DMAX
TON_MIN
VEN
VEN_H
IOFF
IQ
GCS
GEA
AVEA
ISS
TSD
Parameter
Feedback Voltage
Upper Switch On Resistance
Lower Switch On Resistance
Upper Switch Leakage Current
Peak Inductor Current
Oscillator Frequency
Under-Voltage Lockout
Short Circuit Frequency
Maximum Duty Cycle
Minimum On Time
Enable Threshold
Enable Threshold Hysteresis
Supply Current (Shutdown)
Supply Current (Quiescent)
Current Sense Gain
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Soft-Start Current
Thermal Shutdown Temperature
Condition
25°C, 5V<VIN<23V
VEN=0V,VSW=0V
VFB>0.3V
Rising VIN
VFB<0.3V
VEN=0V
VEN>1.6V; VFB=0.8V
Min.
0.58
315
4.2
25
1.2
Typ.
0.60
0.22
4
0
3.5
370
4.6
45
90
210
1.6
150
10
1.0
2
380
400
6
155
Max.
0.62
10
435
5.0
55
2.0
40
2.0
Unit
V
Ω
Ω
µA
A
kHz
V
kHz
%
ns
V
mV
µA
mA
A/V
µA/V
V/V
µA
°C
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.0.0
www.DataSheet.in
5
www.fairchildsemi.com
5 Page 
Physical Dimensions
6.20
5.80
5.00
4.80
3.81
8
A
5
B
4.00
3.80
1.75
0.65
5.60
PIN ONE
INDICATOR
(0.33)
1
4
1.27
0.25 M C B A
1.27
LAND PATTERN RECOMMENDATION
0.25
0.10
1.75 MAX
R0.10
R0.10
8°
0°
0.90
0.406
C
0.51
0.33
0.10 C
0.50
0.25
x
45°
GAGE PLANE
0.36
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
SEE DETAIL A
0.25
0.19
OPTION A - BEVEL EDGE
OPTION B - NO BEVEL EDGE
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA, ISSUE C,
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08AREV13
Figure 18.8-Lead, Small Outline Integrated Circuit (SOIC-8)
Dimensions
Symbol
A
A1
b
c
D
E
e
F
H
L
θ˚
Min.
1.346
0.101
4.648
3.810
5.791
0.406
0˚
Millimeter
Typ.
0.406
0.203
1.270
0.381X45˚
Max.
1.752
0.254
4.978
3.987
6.197
1.270
8˚
Min.
0.053
0.004
0.183
0.150
0.228
0.016
0˚
Inch
Typ.
0.016
0.008
0.050
0.015X45˚
Max.
0.069
0.010
0.196
0.157
0.244
0.050
8˚
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’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev.1.0.0
www.DataSheet.in
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet FAN8303.PDF ] | |
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