参数资料
| 型号： | SC4503TSKTRT |
| 厂商： | Semtech |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.4A TSOT23-5 |
| 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 27V |
| 输入电压： | 2.5 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.3MHz |
| 电流 - 输出： | 1.4A |
| 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-5 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC4503TSKDKR |
SC4503
POWER MANAGEMENT
Applications Information (Cont.)
The minimum SHDN SS voltage for switching is 1.4V. The
graph “Switch Current Limit vs. Shutdown Pin Voltage” in
the “Typical Characteristics” shows that the SHDN SS pin
voltage needs to be at least 2V for the SC4503 to deliver
its rated power. The effect of the SHDN SS voltage on the
SC4503 is analog between 1.4V and 2V. Within this range
the switch current limit is determined not by ILIM but in-
stead by the PWM signal path (see Figure 2). Moreover it
varies with duty cycle and the shutdown pin voltage.
Pulling the SHDN SS pin below 0.4V shuts down the SC4503,
drawing less than 1μA from the input power supply. For
voltages above 2V and below 0.4V, the SHDN SS pin can be
regarded as a digital on/off input. Figure 5 shows several
ways of interfacing the control logic to the shutdown pin. In
Figure 5(a) soft-start is not used and the logic gate drives
the shutdown pin through a small ( ≈ 1k ? ) optional resistor
R SS . R SS limits the current drawn by the SC4503 internal
IN
VIN
IN
V OH > 2V
V OL < 0.4V
R LIM
SC4503
End of Soft-start
V SHDN/SS > 2V
R SS
SC4503
SHDN/SS
(a)
C SS
SHDN/SS
(b)
End of Soft-start
IN
VIN
IN
V OL < 0.4V
V SHDN/SS > 2V
R SS
SC4503
1.7V < V OH < 2V
V OL ≈ 0
D SS
R SS
SC4503
I SHDN/SS
SHDN/SS
CMDSH-3
I SHDN/SS
SHDN/SS
C SS
(c)
C SS
(d)
VIN
IN
VIN
IN
End of Soft-start
V SHDN/SS > 2V
R SS
SC4503
V OH > V IN 1N4148
SC4502
C SS
SHDN/SS
(e)
R SS
C SS
(f)
SHDN/SS
Figure 5. Methods of Driving the Shutdown Pin and Soft-starting the SC4503
(a) Directly Driven from a Logic Gate. R LIM Limits the Gate Output Current during Fault,
(b) Soft-start Only,
(c) Driven from a Logic Gate with Soft-start,
(d) Driven from a Logic Gate with Soft-start (1.7V < V OH < 2V),
(e) Driven from an Open-collector NPN Transistor with Soft-start and
(f) Driven from a Logic Gate (whose V OH > V IN ) with Soft-start.
? 2007 Semtech Corp.
12
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| SC4508AMLTRT | IC REG CTRLR BST INV PWM 12-MLPQ |
| SC4517AIMSTRT | IC REG BUCK ADJ 1.5A 8MSOP |
| SC4518HSETRT | IC REG BUCK 2A 8-SOIC |
| SC4519HSETRT | IC REG BUCK 3A 8-SOIC |
| SC4524ASETRT | IC REG BUCK 2A 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4503WLTRT | 功能描述:IC REG BOOST ADJ 1.4A 8MLPD 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| SC4505 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Boost Converter for Backlight/Flash LED Driver |
| SC4505_07 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Boost Converter for Backlight/Flash LED Driver |
| SC4505EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Boost Converter for Backlight/Flash LED Driver |
| SC4505EVB-1 | 制造商:Semtech Corporation 功能描述:EVALUATION BOARD |
发布紧急采购，3分钟左右您将得到回复。