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PDF AX3120 Data sheet ( Hoja de datos )
| Número de pieza | AX3120 | |
| Descripción | 2.5A Synchronous buck Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3120 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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AX3120
2.5A Synchronous buck Converter
GENERAL DESCRIPTION
AX3120 consists of step-down switching regulator with synchronous PWM converter.
These devise include a reference voltage source, oscillation circuit, error amplifier, internal
PMOS and NMOS etc.
AX3120 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
This converter also contains an error amplifier circuit as well as an enable/soft-start circuit
that prevents overshoot at startup. An enable function, an over current protect function and
short circuit protect function are built inside, and when OCP or SCP happens, the operation
frequency will be reduced. Also, an external compensation is easily to system stable.
With the addition of internal PMOS and NMOS, a coil and capacitors externally, these
ICs can function as step-down switching regulators. They serve as ideal power supply units
for portable devices when coupled with the SOP-8L-EP package, providing such
outstanding features as low current consumption. Since this converter can accommodate
an input voltage up to 23V.
FEATURES
- Input voltage：4.5V to 23V
- Output voltage：VFB to VCC
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：250KHz typ.
- Enable/Soft-Start and Current Limit (CL).
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel and N-channel MOS.
- SOP-8L with Exposed Pad Pb-Free package.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.31, 2010
1 page  
AX3120
APPLICATION CIRCUIT
1. Using Aluminum Electrolytic Capacitor (AL)
VIN=4.5~20V
C1
470uF
R6
2R
C2
0.1uF
C7
4.7nF
C6
0.1uF
4
PVcc
3 SVcc
1 EN/SS
2 SGND
AX3120
SW 5
FB 7
PGND 6
COMP 8
L1
12
33uH
R2
13K
R4 R5
3K
C9
VOUT = 3.3V/2.5A
C3
C5
0.1uF
C4
470uF
R2
VOUT = VFB x (1 +
)
R5
VFB = 0.62V ; R5 suggest 3K ~ 6.8k
COUT ESR Range
VIN
VOUT R4(Ω) C9
C3
30m~80mΩ
4.5V~20V 1.2~5V 1.2K 10n
1000p
80m~300mΩ
4.5V~20V 1.2~1.8V
4.5V~20V 2.0~5V
240
240
10n 22p
10n 180p~270p
2. Using Multilayer Ceramic Capacitor (MLCC)
VIN=4.5~20V
C1
10uF*2
R6
2R
C2
0.1uF
C7
4.7nF
C6
0.1uF
4
PVcc
3 SVcc
1 EN/SS
2 SGND
AX3120
SW 5
FB 7
COMP 8
PGND 6
L1
12
33uH
R4 C8
4K7 1000p
R2
13K
R5
3K
VOUT = 3.3V/2.5A
C3
1000p
C5
0.1uF
C4
22uF*2
R1
VOUT = VFB x (1 + R5 )
VFB = 0.62V ; R5 suggest 3K ~ 6.8k
VIN VOUT R4 C8
4.5V~20V 2.0V~5V 4K7 1000p
C3
1000p
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.31, 2010
5 Page 
AX3120
TYPICAL CHARACTERISTICS (CONTINUOUS)
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency Test (VIN=12V)
0.5 1 1.5 2
Load (A)
VOUT=5.0V
VOUT=3.3V
VOUT=2.5V
VOUT=1.8V
VOUT=1.2V
2.5
Power-ON Wave
(VIN=12V, VOUT=2.5V, Load=2.5A, CEN=0.1uF)
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency Test (VIN=20V)
0.5 1 1.5 2
Load (A)
VOUT=5.0V
VOUT=3.3V
VOUT=2.5V
VOUT=1.8V
2.5
Enable-ON Wave
(VIN=12V, VOUT=2.5V, Load=2.5A, CEN=0.1uF)
Load Transient
(VIN=12V, VOUT=2.5V, Load=0.2~2.5A)
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.31, 2010
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3120.PDF ] | |
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