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AX3103A 데이터시트 PDF




AXElite에서 제조한 전자 부품 AX3103A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 AX3103A 자료 제공

부품번호 AX3103A 기능
기능 PWM Control 3A Step-Down Converter
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AX3103A 데이터시트, 핀배열, 회로
AX3103A
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3103A consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3103A 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 a 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 internal compensation block is built in to minimum
external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected 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
package, providing such outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 23V, it is also suitable for the operation
via an AC adapter.
FEATURES
- Input voltage3.6V to 23V
- Output voltage0.8V to VCC
- Duty ratio0% to 100% PWM control
- Oscillation frequency500KHz typ.
- Soft-start (SS), Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC) application.
- SOP-8L Pb-Free package.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.10, 2010




AX3103A pdf, 반도체, 판매, 대치품
AX3103A
APPLICATION CIRCUIT
MLCC
VCC+12V
C2
10uF*2
ON/OFF R4
C3 100K
0.1uF
C6
0.1uF
option
1
AX3103A
FB VSS
8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
R3 C7
2.2k 330pF
L1
1 15uH 2
R1
D1 39K
B340
R2
7.5K
C1
1nF
VOUT=5V3A
C4
10uF*3
C8
0.1uF
VOUT =
VFB x
(1
+
R1
R2
)
VFB = 0.8 V ; R1 suggest 10K ~ 50K
VIN
7~20V
5~10V
Compensation Capacitor Selection(MLCC)
VOUT L1 R3 C7
5.0/3.3/2.5V 15uH
2.2K
330pF
3.3/2.5V
15uH
6.8K
330pF
C1
1nF
1nF
EL CAP
VCC+12V
ON/OFF R4
C2 C3
100K
470uF 0.1uF
C6
0.1uF
option
AX3103A
1 FB VSS 8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
R3 C7
3.9k 10nF
VOUT =
VFB x
(1 +
R1
R2
)
VFB = 0.8 V ; R2 suggest 0.8K ~ 6.0K
L1
15uH
12
R1
D1 6.8K
B340
R2
1.3K
VOUT=5V3A
C1
1nF
C4 C8
470uF 0.1uF
VIN
7-20V
7-20V
5-7V
5-20V
Compensation Capacitor Selection(EL CAP)
VOUT R3 C7
5.0/3.3/2.5V 3.9K 10nF
C1
1nF
1.8/1.5V
2K 10nF 1nF
3.3/2.5/1.8/1.5/1.2V
2K
10nF
1nF
3.3/2.5/1.8/1.5/1.2V 0.82K
10nF
1nF
L
Coil
Coil
Coil
SMD
4/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.10, 2010

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AX3103A 전자부품, 판매, 대치품
AX3103A
(MLCC CAP)
A 33µF MLCC or three 10uF MLCC capacitors for most applications is sufficient.
Note: MLCC do not support when VOUT is smaller than 2.5V.
RDS (ON) Current Limiting
The current limit threshold is setting by the internal circuit.
VIN
4.6V~6V
6V~10V
10V~20V
ICL(MIN)
3A
3.8A 4.0A
IOUT(MAX)
2.5A
3A
3A
PCB Layout Guide
If you need low Tc and Tj or large PD(Power Dissipation), The dual SW pins(5 and 6)
and VSS pins(7 and 8)on the SOP-8L package are internally connected to die pad, The
PCB layout should allow for maximum possible copper area at the SW pins.
1. Connect C3 to VCC and VSS pin as closely as possible to get good power filter effect.
2. Connect ground side of the C2 and D1 as closely as possible.
3. D1’ground must be closed to input capacitor’s ground (C2).
IC’s ground is connect to output
capacitor’s ground, and use
through hole to conduct the heat
into the backside of PCB layer.
The heat sink copper of PCB area
should be solder-painted without
masked.
Bypass C3 need closely from
IC’s VCC to VSS pins.
7/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Aug.10, 2010

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