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부품번호 | AX3484 기능 |
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기능 | 340kHz Synchronous Rectified Step-Down Converter | ||
제조업체 | AXElite | ||
로고 | |||
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
AX3484
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = +25°C, unless otherwise noted.)
Characteristics
Symbol Conditions
Min Typ Max Units
Operating Voltage
VIN
4.75 - 23 V
Shutdown Supply Current
ISD VEN = 0V
- 1 3.0 μA
Feedback Voltage
VFB 4.75V ≤ VIN ≤ 23V
High-Side
(Note)
Switch
On
Resistance
RDS(ON)1
Low-Side
(Note)
Switch
On
Resistance RDS(ON)2
High-Side Switch Leakage Current
VEN = 0V, VSW = 0V
0.900 0.925 0.950 V
- 100 - mΩ
- 100 - mΩ
- - 10 μA
Switch Current Limit
3.8 - - A
Oscillation Frequency
FOSC1
280 350 430 KHz
Short Circuit Oscillation Frequency FOSC2 VFB = 0V
- 90 - KHz
Maximum Duty Cycle
DMAX VFB = 0.8V
- 90 - %
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage
Hysterisis
Soft-Start Current
ENH VEN Rising
ISS VSS = 0V
1.1 1.5 2.0 V
- 210 - mV
- 6 - μA
Soft-Start Period
CSS = 0.1μF
- 15 - ms
Thermal Shutdown
TSD
- 160 - °C
Thermal Shutdown Hysterisis
Note: Guaranteed by design.
TSH
- 35 - °C
4/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011
4페이지 TYPICAL CHARACTERISTICS
Output=3.3V
AX3484
Output=5V
7/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011
7페이지 | |||
구 성 | 총 9 페이지수 | ||
다운로드 | [ AX3484.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
AX3482 | 340kHz Synchronous Rectified Step-Down Converter | AXElite |
AX3484 | 340kHz Synchronous Rectified Step-Down Converter | AXElite |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |