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PDF AIC2857F Data sheet ( Hoja de datos )
| Número de pieza | AIC2857F | |
| Descripción | Step-Down Converter | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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AIC2857F
2A 23V Synchronous Step-Down Converter
FEATURES
2A Continuous Output Current
Programmable Soft Start
130mΩ Internal Power MOSFET Switches
Stable with Low ESR Output Ceramic Capaci-
tors
Up to 93% Efficiency
<1µA Supply Current in Shutdown Mode
Fixed 340KHz Frequency
Thermal Shutdown
Cycle by Cycle Over Current Protection
Wide 4.75 to 23V Operating Input Range
Output Adjustable from 0.925V to 12V
Under Voltage Lockout
APPLICATIONS
Networking Systems such as Modems &
Routers
Distributed Power Systems
Pre-Regulator for Linear Regulators.
Set-top Box
DESCRIPTION
The AIC2857F is a synchronous step-down
regulator with an integrated Power MOSFET. 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.
Adjustable soft-start reduces the stress on the
input source and the output overshoot at turn-
on. In shutdown mode, the regulator draws
1µA or less of supply current.
The AIC2857F is available in SOP8 and SOP-
8 with Exposed Pad Package.
TYPICAL APPLICATIONS CIRCUIT
12V U1
C6
2 IN
BS 1
ON OFF 7
EN
SW 3 10nF
6 COMP
FB 5
C1
10uF
4 GND
Cc
3.9nF
AIC2857 F
SS 8
Rc
9.1k C5
10nF
L1
15uH
5V
C3
22uF
R1
44.2k
R2
10k
Typical Application Circuit
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
DS-2857FG-02
www.analog.com.tw
20120103
1
1 page  
AIC2857F
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VOUT
VIN=12V, VOUT=3.3V
VOUT
VIN=12V, VOUT=3.3V
ILX ILX
Fig. 7 Short Circuit Waveforms
VIN
VOUT
VSW
VIN=12V, VOUT=3.3V,
Css=10n
ILX
Fig. 8 Short Circuit Recovery Waveforms
VIN
VOUT
VSW
VIN=12V, VOUT=3.3V,
Css=10n
ILX
Fig. 9 Stability Waveform at VOUT=3.3V, IOUT=0A
Fig. 10 Stability Waveform at VOUT=3.3V, IOUT=2A
5
5 Page 
PHYSICAL DIMENSIONS
SOP-8
D
AIC2857F
AA
e
SEE VIEW B
WITH PLATING
B
BASE METAL
SECTION A-A
L
VIEW B
GAUGE PLANE
SEATING PLANE
Note: 1. Refer to JEDEC MS-012AA.
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "E" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
S
Y
M
B
O
L
A
A1
B
C
D
E
e
H
h
L
θ
SOP-8
MILLIMETERS
MIN. MAX.
1.35 1.75
0.10 0.25
0.33 0.51
0.19 0.25
4.80 5.00
3.80 4.00
1.27 BSC
5.80
6.20
0.25 0.50
0.40 1.27
0° 8°
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AIC2857F.PDF ] | |
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