The AOZ2151QI-09 is a high-efficiency, easy-to-use DC/
DC synchronous buck regulator that operates up to 28V.
The device is capable of supplying 4A of continuous
output current with an output voltage adjustable down to
0.8V ±1%.
The AOZ2151QI-09 integrates an internal linear regulator
to generate 5.3V VCC from input. If input voltage is lower
than 5.3V, the linear regulator operates at low drop
output mode, which allows the VCC voltage is equal to
input voltage minus the drop-output voltage of the
internal linear regulator.
A proprietary constant on-time PWM control with input
feed-forward results in ultra-fast transient response while
maintaining relatively constant switching frequency over
the entire input voltage range.
The device features multiple protection functions such as
VCC under-voltage lockout, cycle-by-cycle current limit,
output over-voltage protection, short-circuit protection,
ａnd thermal shutdown.
The AOZ2151QI-09 is available in a 3mm×3mm QFN-
18L package and is rated over a -40°C to +85°C ambient
temperature range.
aoz2151qi-09是一種高效、易用的DC/DC同步降壓穩(wěn)壓器，工作電壓28V。
該裝置可提供4A輸出電流連續(xù)可調(diào)低至0.8V±1%輸出電壓。
集成的aoz2151qi-09從輸入產(chǎn)生5.3v VCC內(nèi)部線性穩(wěn)壓器。
如果輸入電壓低于5.3v，線性穩(wěn)壓器工作在低壓降輸出模式，
使VCC電壓等于輸入電壓減去內(nèi)部線性穩(wěn)壓器輸出電壓的下降。
一個(gè)專有的恒定時(shí)PWM控制與輸入前饋的結(jié)果在超快速瞬態(tài)響應(yīng)，
同時(shí)保持相對恒定的開關(guān)頻率在整個(gè)輸入電壓范圍內(nèi)。
該器件具有多種保護(hù)功能，
如VCC欠壓鎖定，逐周期電流限制，輸出過壓保護(hù)，短路保護(hù)和熱關(guān)機(jī)。
aoz2151qi-09可在3mm×3mm QFN - 18l封裝，額定在40°C + 85°C環(huán)境溫度范圍。
? Wide input voltage range
– 6.5V to 28V
? 4A continuous output current
? Output voltage adjustable down to 0.8V (±1.0%)
? Low RDS(ON) internal NFETs
– 28m? high-side
– 28m? low-side
? Constant On-Time with input feed-forward
? Ceramic capacitor stable
? Adjustable soft start
? Power Good output
? Integrated bootstrap diode
? Cycle-by-cycle current limit
? Short-circuit protection
? Thermal shutdown
? Thermally enhanced 3mm x 3mm QFN-18L package
Applications
? Compact desktop PCs
? Graphics cards
? Set-top boxes
? LCD TVs
? Cable modems
? Point-of-load DC/DC converters
? Telecom/Networking/Datacom equipment
寬輸入電壓范圍
–至6.5V至28V
4a連續(xù)輸出電流
可調(diào)輸出電壓低至0.8V（±1%）
低RDS（ON）內(nèi)部NFET
–28m?高邊
–28m?偏低
具有輸入前饋的定時(shí)常數(shù)
陶瓷電容器穩(wěn)定
可調(diào)軟啟動(dòng)
Power Good output
集成自舉二極管
逐周期電流限制
短路保護(hù)
熱關(guān)斷
熱增強(qiáng)3mm x 3mm qfn-18L封裝
應(yīng)用
小型臺(tái)式個(gè)人電腦
顯卡
設(shè)置機(jī)頂盒
液晶電視
電纜調(diào)制解調(diào)器
負(fù)載點(diǎn)DC/DC轉(zhuǎn)換器
電信/網(wǎng)絡(luò)/數(shù)據(jù)通信設(shè)備
