参数资料
| 型号： | SC630AULTRT |
| 厂商： | Semtech |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP 3.3V 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： | 3.3V |
| 输入电压： | 2.95 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 300mA |
| 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： | SC630AULDKR |
SC630A
Applications Information
General Description
The SC630A is a 3.3V output charge pump regulator
designed to support up to 300mA (T A ≤ 85°C, 2.95V ≤ V IN ≤
5.5V) of continuous current. It is used for powering Micro
HDDs (Hard Disk Drives) and other 3.3V devices in porta-
ble handheld equipment including Compact Flash and
CF+ products.
The SC630A has three operating modes — x, .5x, and
2x. The x mode is a linear series regulation mode with a
low output resistance of only 300m ? . The x mode func-
tions as a low noise series linear regulator. The .5x and 2x
Temperature Derating
The load current and battery voltage range of the appli-
cation should be compared with the efficiency plots on
page 6 to determine if 2x mode is required by the appli-
cation. The data provided in the following derating curve
for 2x mode is based on the peak power dissipation that
could occur while in 2x mode. x and .5x modes do not
require derating.
350
300
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
250
200
150
Derating for applications
requiring 2x mode
roles in the next phase, supplying continuous output
current in both phases and reducing the need for a large
output decoupling capacitor. The constant frequency,
100
35
45
55
65 75
Ambient Temperature (°C)
85
95
105
constant duty cycle operation also produces predictable
constant frequency harmonics.
Mode Transition Hysteresis
Hysteresis is provided to prevent chatter between charge
pump modes. The hysteresis between charge pump
modes is shown in the efficiency plots of the Typical
Maximum Continuous Output
Protection Circuitry
The SC630A also provides protection circuitry that pre-
vents the device from operating in an unspecified state.
These functions include:
Characteristics section. For optimum transient perfor-
mance, the input should be decoupled to prevent steps
greater than the hysteresis voltage. Note that hysteresis is
load dependent, and increases with the load current to
?
?
?
Over-Current Protection (OCP)
Short-Circuit Current Protection (SCCP)
Over-Temperature Protection (OTP)
prevent chatter between the charge pump modes.
Thermal Resistance
The SC630A package is thermally efficient when the
circuit board layout connects the thermal pad through
multiple vias to the ground plane. The thermal resistance
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 SC630A within the
specified electrical conditions. A poor layout may allow
the junction temperature to reach the over temperature
limit, so it is important to maintain adequate ground
plane around the device to maximize heat transfer to the
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.
Short-Circuit Current Protection
Short-circuit current protection is provided to limit the
current that can be sourced when the output is shorted
to ground. When a short circuit forces V OUT to drop below
2V, the SCCP detects the condition and limits the output
current to 600mA (typical).
PCB.
0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC630EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Fixed 3.3V High Output Charge Pump Buck/Boost Regulator |
| SC630JW | 功能描述:音频指示器及警报器 SLOW WARBLE, 6-30VDC MEDIUM RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole |
| SC630JWR | 功能描述:音频指示器及警报器 SLOW WARBLE, 6-30VDC MEDIUM RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole |
| SC630ULTRT | 制造商:Semtech Corporation 功能描述:Charge Pump STPUP/STPDN 3.3V 400mA 8-Pin MLPD-UT EP T/R |
| SC631 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Fixed 4.4V Output Charge Pump Regulator |
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