参数资料
| 型号： | SC4501MLTRT |
| 厂商： | Semtech |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2A 10MLPD |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 32V |
| 输入电压： | 1.4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 2A |
| 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： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD（3x3） |
| 其它名称： | SC4501MLDKR |
SC4501
POWER MANAGEMENT
Application Information
(a)
IN
SC4501
SHDN
(b)
IN
SC4501
SHDN
VIN
1N4148
(c)
IN
SC4501
SHDN
(d)
IN
SC4501
SHDN
Figure 6. Methods of Driving the Shutdown Pin
(a) Directly Driven from a Logic Gate
(b) Driven from an Open-drain N-channel MOSFET or an Open-Collector NPN Transistor (V OL < 0.1V)
(c) Driven from a Logic Gate with V OH > V IN
(d) Combining Shutdown with Programmed UVLO (See Section Below).
Programming Undervoltage Lockout
V H and V L are therefore:
V H = ? ? 1 + 3 ? ? ( 1 . 1 V )
The SC4501 has an internal V IN undervoltage lockout
(UVLO) threshold of 1.4V. The transition from idle to
switching is abrupt but there is no hysteresis. If the input
voltage ramp rate is slow and the input bypass is limited,
then sudden turn on of the power transistor will cause a
dip in the line voltage. Switching will stop if V IN falls below
the internal UVLO threshold. The resulting output voltage
? R ?
? R 4 ?
V L = V H ? V HYS = V H ? I HYS R 3
Re-arranging,
(10)
? 1
rise may be non-monotonic. The 1.1V disable threshold of
the SC4501 can be used in conjunction with a resistive
voltage divider to raise the UVLO threshold and to add an
UVLO hysteresis. Figure 7 shows the scheme. Both V H and
V L (the desired upper and the lower UVLO threshold
voltages) are determined by the 1.1V threshold crossings,
2011
? 2005 Semtech Corp.
12
R 3 =
R 4 =
V HYS
I HYS
R 3
V H
1 . 1
(11)
(12)
www.semtech.com
相关PDF资料 |
PDF描述 |
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| SC4502HMLTRT | IC REG BOOST ADJ 1.4A 10MLPD |
| SC4503TSKTRT | IC REG BOOST ADJ 1.4A TSOT23-5 |
| SC4508AMLTRT | IC REG CTRLR BST INV PWM 12-MLPQ |
| SC4517AIMSTRT | IC REG BUCK ADJ 1.5A 8MSOP |
| SC4518HSETRT | IC REG BUCK 2A 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4501MSETRT | 功能描述:IC REG BOOST ADJ 2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| SC4501STDEVB | 制造商:Semtech Corporation 功能描述:EVALUATION BOARD 制造商:SEMTECH 功能描述:Eval Board for SC4501 Step-Up Switching Regulator |
| SC4502 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start |
| SC4502EVB | 制造商:SEMTECH 功能描述:Evaluation Board for SC4502 Series Step-up Switching Regulator |
| SC4502H | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start |
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