参数资料
| 型号： | SC283WLTRT |
| 厂商： | Semtech |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.8A 18MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 1.8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 18-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 18-MLPQ-W（2x3） |
| 其它名称： | SC283WLDKR |
SC283
Applications Information (continued)
SC283 Maximum Load Current for T J =125°C
lower allowing higher load current. for T J =125°C
and 3b show the maximum allowable load current based
upon the limit of maximum loss for V IN =3.3V and V IN =5.0V,
respectively. The curves are drawn for high duty-cycle
operation. If the operating duty-cycle is lower, the loss is
SC283 Maximum Loss
1.8
2.0
1.8
1.6
1.4
1.2
1.0
T A = 60°C
T A ? 42°C
1.6
1.4
T A = 25°C
0.8
0.6
1.2
1.0
T A = 55°C
0.4
0.2
V IN = 3.3V
V OUT = 2.5V
T A = 85°C
0.8
0.6
0.4
T A = 85°C
0.0
Load Current of Channel A (A)
(a)V IN = Load V OUT for T
SC283 Maximum 3.3V, Current =2.5V J =125°C
0.2
0.0
Loss of Channel A (W)
2.0
1.8
1.6
T A = 70°C
T A ? 47°C
?
?
?
?
V OUT = 3.3V
V IN = 3.6V
Figure2—Maximumallowablelossforeachchannel
for a maximum junction temperature of 125°C
Protection Features
The SC283 provides the following protection features:
Current Limit
Over-Voltage Protection
Soft-Start Operation
Thermal Shutdown
Current Limit and Protection
The internal PMOS power device in the switching stage
is protected by a current limit feature. If the inductor
current is above the PMOS current limit for 16 consecutive
cycles, the part enters foldback current limit mode and
the output current is limited to the current limit holding
current (I CL_HOLD ) of a few hundred milliampere. Under
this condition, the output voltage will be the product
of I CL_HOLD and the load resistance. The current limit
holding current will decrease when the output voltage
increases. The load presented must fall below the current
limit holding current for the part to exit foldback current
1.4
1.2
1.0
0.8
T A = 85°C
0.6
0.4
V IN = 5.0V
0.2
0.0
Load Current of Channel A (A)
(b) V IN = 5.0V, V OUT =3.3V
Figure 3 — Maximum allowable Load Current for each
channel for a maximum junction temperature of 125°C
Current Limit Holding Current over Vout
300
T A = 25°C
250
V IN = 5.0V
200
150
100
limit mode. Figure 4 shows how the typical current limit
holding current varies with output voltage. The SC283 is
50
V IN = 3.3V
capable of sustaining an indefinite short circuit without
damage and will resume normal operation when the fault
0
1.0
1.5
2.0 2.5
Output Voltage (V)
3.0
3.5
is removed. The foldback current limit mode is disabled
during soft-start. Current limit functionality is shown in
Figure 6.
Figure 4 — Typical Current Limit Holding Current
? 2010 Semtech Corp.
13
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC284 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Dual Channel 2.5MHz, 1.8A Synchronous Step-Down Regulator |
| SC284ULTRT | 制造商:Semtech Corporation 功能描述:Conv DC-DC Dual Step Down 2.9V to 5.5V 20-Pin MLPQ EP T/R |
| SC28-6 | 制造商:Thomas & Betts 功能描述:IDENTIFICATION TAGS |
| SC286ULTRT | 功能描述:IC REG BUCK SYNC ADJ 4A 28MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:1,000 系列:- 类型:降压（降压） 输出类型:可调式 输出数:1 输出电压:0.6 V ~ 4.5 V 输入电压:3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:3MHz 电流 - 输出:1.5A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:6-LLP-EP（3x3） 产品目录页面:1300 (CN2011-ZH PDF) 其它名称:LM2831ZSDLM2831ZSDTR |
| SC28829PK04 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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