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AX3103 데이터시트 PDF




AXElite에서 제조한 전자 부품 AX3103은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 AX3103 자료 제공

부품번호 AX3103 기능
기능 PWM Control 3A Step-Down Converter
제조업체 AXElite
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AX3103 데이터시트, 핀배열, 회로
AX3103
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3103 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3103 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 frequency330KHz 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.
Axelite Confidential Materials, do not copy or distribute without written consent.
1/11




AX3103 pdf, 반도체, 판매, 대치품
AX3103
APPLICATION CIRCUIT
MLCC
VCC+12V
C2
22uF
ON/OFF R4
C3 100K
0.1uF
C6
0.1uF
option
AX3103
1 FB VSS 8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
R3 C7
4k 680pF
L1
122uH 2
R1
D1 6.8K
B340
R2
1.3K
VOUT=5V3A
C1
1nF
C4 C8
22uF 0.1uF
VOUT =
VFB
x
(1
+
R1
R2
)
VFB = 0.8 V ; R2 suggest 0.8K ~ 3.0K
Compensation Capacitor Selection(MLCC)
VIN VOUT
L1 R3 C7
12V 5.0/3.3/2.5V 15uH 4K 680pF
5V
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
AX3103
1 FB VSS 8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
R3 C7
3.9k 10nF
L1
122uH 2
R1
D1 30K
B340
R2
5.6K
VOUT=5V3A
C1
1nF
C4 C8
470uF 0.1uF
VOUT =
VFB
x
(1
+
R1
R2
)
VFB = 0.8 V ; R2 suggest 0.8K ~ 6.0K
VIN
5-20V
Compensation Capacitor Selection(EL CAP)
VOUT L1 R3 C7
5/3.3/2.5/1.8V 15uH
3.9K
10nF
C1
1nF
4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.3 Mar.29, 2011

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AX3103 전자부품, 판매, 대치품
AX3103
RDS (ON) Current Limiting
The current limit threshold is setting by the internal circuit.
VIN
4V~4.7V
4.7V~20V
ICL(MIN)
3.3A
4A
IOUT(MAX)
2.5A
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.
Use through hole to conduct the
heat into the backside of PCB
The heat sink copper of PCB area
should be solder-painted without
masked.
Bypass C3 need closely from
IC’s VCC to VSS pins.
7/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.3 Mar.29, 2011

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