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参数资料
| 型号： | SC4503WLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.4A 8MLPD |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MLPD（2x2） |
| 其它名称： | SC4503WLDKR |
SC4503
1.3MHz Step-Up Switching
Regulator with 1.4A Switch
POWER MANAGEMENT
Description
The SC4503 is a 1.3MHz current-mode step-up switch-
ing regulator with an integrated 1.4A power transistor.
Its high switching frequency allows the use of tiny sur-
face-mount external passive components. The SC4503
features a combined shutdown and soft-start pin. The
optional soft-start function eliminates high input current
and output overshoot during start-up. The internal com-
pensation network accommodates a wide range of volt-
age conversion ratios. The internal switch is rated at 34V
making the device suitable for high voltage applications
such as Boost and SEPIC.
Features
Low Saturation Voltage Switch: 260mV at 1.4A
1.3MHz Constant Switching Frequency
Peak Current-mode Control
Internal Compensation
Programmable Soft-Start
Input Voltage Range From 2.5V to 20V
Output Voltage up to 27V
Uses Small Inductors and Ceramic Capacitors
Low Shutdown Current (< 1 μ A)
Low Pro ? le 5-Lead TSOT-23 and 8-Lead 2X2mm
MLPD-W packages
Fully WEEE and RohS compliant
The SC4503 is available in low-pro ? le 5-lead TSOT-23 and
8-lead 2X2mm MLPD-W packages. The SC4503’s low
shutdown current (< 1 μ A), high frequency operation and
small size make it suitable for portable applications.
Applications
Local DC-DC Converters
TFT Bias Supplies
XDSL Power Supplies
Medical Equipment
Digital Cameras
Portable Devices
White LED Drivers
Typical Application Circuit
VIN
L1
D1
VOUT
Efficiency vs Load Current
5V
5
IN
4.7 μ H
1
SW
10BQ015
C4
15pF
R1
432k
12V, 0.5A
95
90
85
1.3MHz
C1
1 μ F
OFF ON
4
SC4503
SHDN/SS
FB
3
C2
4.7 μ F
80
75
GND
70
2
R2
49.9k
65
60
55
V OUT = 12V
C1: Murata GRM188R61A105K
C2: Murata GRM21BR61C475K
L1: Sumida CDC5D23B-4R7
50
0.001
0.010 0.100
Load Current (A)
1.000
Figure 1(a). 5V to 12V Boost Converter
Figure 1(b). Ef ? ciency of the 5V to 12V Boost Converter
May 4, 2007
1
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| SC4505EVB-2 | 制造商:Semtech Corporation 功能描述:EVALUATION BOARD |
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