参数资料
| 型号： | SC632AULTRT |
| 厂商： | Semtech |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP 5V 8MLPD |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.95 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 275mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MLPD（2x2） |
| 其它名称： | SC632AULDKR |
SC632A
Applications Information
General Description
The SC632A is a 5.0V output charge pump regulator
designed to support up to 300mA (T A ≤ 80°C, 3. 5V ≤ V IN ≤
4.2V) and 275mA (T A ≤ 85°C, 3. 5V ≤ V IN ≤ 5.5V) of continu-
ous current for powering 5.0V devices in portable
handheld equipment including Compact Flash and CF+
products.
The SC632A has three operating modes — x, .5x, and
Temperature Derating
The V IN supply range and ambient temperature range of
the application should be compared with the following
derating curve to determine the maximum safe continu-
ous load current. The DC operating points beneath each
curve are in the safe operating temperature range of the
MLP package.
450
2x. The x mode is a linear series regulation mode with a
low open-loop output resistance of only 250m W . The x
mode functions as a low-noise series linear regulator. The
.5x and 2x modes are a low noise, constant frequency,
constant duty cycle switch mode, using two bucket
capacitors. One bucket supports the full output current
while the other bucket charges from the input. The two
buckets exchange roles in the next phase, supplying con-
tinuous output current in both phases and reducing the
need for a large output decoupling capacitor. The constant
400
350
300
250
200
Derating for V IN < 5.5V
Derating for V IN < 4.2V
frequency, constant duty cycle operation also produces
predictable constant frequency harmonics.
150
35
45
55
65 75
Ambient Temp (°C)
85
95
105
Mode Transition Hysteresis
Hysteresis is provided to prevent chatter between charge
pump modes for input steps of up to 20mV. Decouple
the input to prevent steps greater than 20mV, for
optimum transient performance, when the input voltage
reaches the mode transition thresholds.
Maximum Continuous Output
Protection Circuitry
The SC632A also provides protection circuitry that pre-
vents the device from operating in an unspecified state.
These functions include:
Thermal Resistance
The SC632A package is thermally efficient when the circuit
board layout connects the thermal pad through multiple
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Over-Current Protection (OCP)
Short-Circuit Current Protection (SCCP)
Over-Temperature Protection (OTP)
vias to the ground plane. The thermal resistance rating is
dependent upon the connection between the thermal
pad and the ground plane. A layout that is done correctly
should keep the junction temperature below the over-
temperature limit while operating the SC632A within the
specified electrical conditions. A poor layout may allow
the junction temperature to reach the over temperature
Over-Current Protection
Over-current protection is provided to limit the output
current. When V OUT is greater than 2V, OCP limits the
output to A typical. The threshold at 2V allows the
device to recover from excessive voltage droop during an
over current.
limit, so it is important to maintain adequate ground plane
around the device to maximize heat transfer to the PCB.
0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC632EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Fixed 5.0V Output Charge Pump Regulator |
| SC632UL.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC632ULTRT | 制造商:Semtech Corporation 功能描述:Charge Pump STPUP 5V 275mA 8-Pin MLPD-UT T/R 制造商:SEMTECH 功能描述:Simple charge pump buck-boost converter |
| SC633 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Fixed 5.3V Output Charge Pump Regulator |
| SC-63-3-5 | 功能描述:KNOB CLR/MATTE.625"DIA.250"SHAFT RoHS:是 类别:硬件，紧固件，配件 >> 旋钮 系列:SC 标准包装:1 系列:- 样式:圆柱形 类型:开槽 轴尺寸:0.250"（6.35mm） 直径:1.031"（26.19mm） 高度:0.688"（17.48mm） 指示灯:无指示灯 材质:塑料 颜色:黑 特点:8-32 号固定螺丝 |
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