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PDF AIC2858F Data sheet ( Hoja de datos )
| Número de pieza | AIC2858F | |
| Descripción | Step-Down Converter | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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AIC2858F
3A 23V Synchronous Step-Down Converter
FEATURES
3A Continuous Output Current
Programmable Soft Start
100mΩ Internal Power MOSFET Switches
Stable with Low ESR Output Ceramic Capaci-
tors
Up to 95% 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 AIC2858F is a synchronous step-down
regulator with an integrated Power MOSFET. It
achieves 3A 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 AIC2858F is available in a SOP-8 with
Exposed Pad Package.
TYPICAL APPLICATIONS CIRCUIT
12V
C1
10uF
U1
2 IN
ON OFF 7
EN
6 COMP
C2
10uF
Cc
3.3nF
Rc
10k
4 GND
AIC2858F
C6
BS 1
SW 3 10nF
FB 5
SS 8
C5
10nF
L1
15uH
5V
C3
22uF
C4
22uF
R1
44.2k
R2
10k
Analog Integrations Corporation
Typical Application Circuit
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-2858FG-01 20120103
www.analog.com.tw
1
1 page  
AIC2858F
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=3A
5
5 Page 
PHYSICAL DIMENSIONS
SOP-8 Exposed Pad (Heat Sink)
D
EXPOSED THERMAL PAD(Heat Sink)
(BOTTOM CENTER OF PACKAGE)
D1
E1
AIC2858F
AA
e
WITH PLATING
B
BASE METAL
SECTION A-A
GAUGE PLANE
SEATING PLANE
L
VIEW B
Note : 1. Refer to JEDEC MS-012E.
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.
SEE VIEW B
S SOP-8 Exposed Pad(Heat Sink)
Y
M MILLIMETERS
B
O
L
MIN.
MAX.
A 1.35
1.75
A1 0.00
0.15
B 0.31
0.51
C 0.17
0.25
D 4.80
5.00
D1 1.50
3.50
E 3.80
4.00
E1 1.0
2.55
e 1.27 BSC
H 5.80
6.20
h 0.25
L 0.40
0.50
1.27
θ 0°
8°
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any
circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third par-
ties that may result from its use. We reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or
systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure
to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AIC2858F.PDF ] | |
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