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A5268 데이터시트 PDF




ANPEC에서 제조한 전자 부품 A5268은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 A5268 자료 제공

부품번호 A5268 기능
기능 340KHz Synchronous Rectified Step-Down Converter
제조업체 ANPEC
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A5268 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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A5268 데이터시트, 핀배열, 회로
A5268
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
n General Description
n Features
The A5268 is a fixed frequency monolithic synchro-
nous buck regulator that accepts input voltage from 4.75V
to 28V. Two NMOS switches with low on-resistance are
integrated on the die. Current mode topology is used for
fast transient response and good loop stability.
Shutdown mode reduces the input supply current to less
than 1µA. An adjustable soft-start prevents inrush current
at turn-on.
This device is available in SOP-8/PP package with ex-
posed pad for low thermal resistance.
n Applications
l Distributed Power System
l Networking System
l FPGA, DSP, ASIC Power Supplies
l Notebook Computers
l 3A Output Current
l Wide 4.75V to 28V Operating Input Range
l Integrated Power MOSFET Switches
l Output Adjustable from 0.925V to 25V
l Up to 95% Efficiency
l Programmable Soft Start
l Stable with Low ESR Ceramic Output
Capacitors
l Cycle-by Cycle Over Current Protection
l Fixed 340KHz Frequency
l Input Under Voltage Lockout
l System Protected by Over-current Limiting,
Over-voltage Protection and Thermal Shut-
down
l Thermally Enhanced SOP-8/PP Package
l Green Products Meet RoHS Standards
C n Typical Application
i e VIN
12V
C5
10nF
C1
10µF/35V
x2
C4
0.1µ F
R4
100K
IN BS
EN SW
A5268
L1
15µH/3.4A
VOUT
5V
3A
SS SFB
GND COMP
R1
C3 44.2K1%
3.3nF
R2
R3 10K1%
6.98K1%
C2
22µF/10V
x2
Rev.B.02
1




A5268 pdf, 반도체, 판매, 대치품
A5268
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
n Pin Description
Pin Number Pin Name
1 BS
2 IN
3 SW
4 GND
5 FB
6 COMP
7 EN
8 SS
Pin Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-
Channel MOSFET switch. Connect a 10nF or greater capacitor from SW to
BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down
converter switches. Drive IN with a 4.75V to 28V power source. Bypass IN to
GND with a suitable large capacitor to eliminate noise on the input to the IC.
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch.
Ground. Connect the exposed pad to pin 4.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive
FB with a resistive voltage divider from the output voltage. The feedback
reference voltage is 0.925V.
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND to compensate the
regulation control loop. In some cases, an additional capacitor from COMP to
GND is required.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
higher than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off.
Pull up to the IN pin with 100Kresister for automatic start up.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the soft-start period. Add a 0.1µF capacitor set the
soft-start period to 15mS. To disable the soft start feature, leave the SS
unconnected.
4 Rev.B.02

4페이지










A5268 전자부품, 판매, 대치품
A5268
n Electrical Specifications
V = 12V, T = 25OC, unless otherwise noted.
IN A
Parameter
Symbol
Shutdown Current
Supply Current
ISHDN
Feedback Voltage
VFB
OVP Threshold Voltage
Error Amplifier Voltage Gain
Error Amplifier Transconductance
High-side Switch On Resistance
AEA
GEA
RDS,ON,HI
Low-side Switch On Resistance
Switch Leakage Current
High-side Switch Current Limit
RDS,ON,LO
ISW,LK
Low-side Switch Current Limit
COMP to Current Sense
Transconductance
GCS
Current Limit Oscillation Frequency fOSC,CL
Short Circuit Oscillation Frequency fOSC,SCR
Maximum Duty Cycle
Minimum On Time
DMAX
tON,MIN
Input Undervoltage Lockout
VUVLO
Input Undervoltage Lockout
Hysteresis
Soft-Start Current Source
Soft-Start Period
VUVLO,HYST
ISS
tSS
EN Lockout Threshold Voltage
VEN
3A, 28V, 340KHz Synchronous
Rectified Step-Down Converter
Test Condition
VEN = 0V
VEN = 3V, VFB = 1.2V
4.75V <= VIN<=28V
IC = ±10µA
VEN = 0V, VSW = 0V
Minimum Duty Cycle
From Drain to Source
TA = 25OC
C-40OC<=TA<=+85OC
VFB = 0V
i e VFB =0.8V
VIN rising, TA = 25OC
-40OC<=TA<=+85OC
VSS = 0V
CSS = 0.1µF
TA = 25OC
-40OC<=TA<=+85OC
Min Typ Max Units
1 3.0 µA
1.3 1.5 mA
0.90 0.925 0.95 V
1.10 V
400 V/V
800 µA/V
135 m
105 m
10 µA
4 5.8
A
1.25 A
5.2 A/V
300 340 380 KHz
270 400 KHz
116 KHz
90
220
3.8 4.05 4.3
3.5 4.7
%
nS
V
V
210 mV
6 µA
15 mS
2.2 2.5 2.7 V
2.2 2.7 V
Rev.B.02
7

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