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PDF AX3484 Data sheet ( Hoja de datos )
| Número de pieza | AX3484 | |
| Descripción | 340kHz Synchronous Rectified Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3484 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AX3484
3A, 23V, 340kHz Synchronous Rectified
Step-Down Converter
GENERAL DESCRIPTION
The AX3484 is a monolithic synchronous buck regulator. The device integrates two
100mΩ MOSFETs, and provides 3A of continuous load current over a wide input voltage of
4.75V to 23V. Current mode control provides fast transient response and Cycle-by-Cycle
current limit.
An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the
supply current drops to 1μA.
This device, available in an 8-pin SOP with exposed pad package, provides a very
compact solution with minimal external components.
FEATURES
- 3A Output Current
- Wide 4.75V to 23V Operating Input Range
- Integrated 100mΩ Power MOSFET Switches
- Output adjust from VFB to 20V
- Up to 95% Efficiency
- Programmable Soft-Start
- Stable with Low ESR Ceramic Output Capacitors
- Fixed 350KHz Frequency
- Cycle-by-Cycle Over Current Protection
- Thermal shutdown and short circuit protections
BLOCK DIAGRAM
FB 5
OSCILLATOR
90/350KHz
RAMP
CLK
SS 8
0.925V
-
+
+
ERROR
AMPLIFIER
6μA
CURRENT
SENSE
AMPLIFIER
+ SQ
RQ
- CURRENT
COMPARATOR
2 IN
+
5V
-
M1
100mΩ
1 BS
3 SW
M2
100mΩ
4 GND
COMP 6
EN 7
7V
Zener
+
1.5V -
SHUTDOWN
COMPARATOR
EN
IN
INTERNAL
REGULATORS
5V
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011
1 page  
AX3484
APPLICATION CIRCUIT
INPUT
C5
10nF
C1
10μF/25V
R4
100kΩ
IN BS
EN SW
AX3484
SS FB
GND COMP
C4
0.1μF
C3
3.3nF
R3
2.2k
L1
10uH
R1
25.7k
R2
10k
OUTPUT
3.3V
3A
C2
10μF/6.3V×2
VOUT=VFB
×
(1+
R1
R2
),
VFB
=
0.925V,
R2
suggest
10k~30KΩ
Table Recommended Component Selection
VIN (V) VOUT (V) R1 (KΩ) R2 (KΩ) R3 (KΩ) C3 (nF)
12 5 44.1 10 2.2 3.3
5 or 12 3.3 25.7 10 2.2 3.3
5 or 12 1.8 9.5 10 2.2 3.3
5 or 12 1.2 3 10 2.2 3.3
5 or 12 1 0.81 10 2.2 3.3
L1 (μH)
15
10
4.7
3.3
2.2
COUT (μF)
10 X 2
10 X 2
10 X 2
10 X 2
10 X 2
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX3484.PDF ] | |
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