参数资料
| 型号： | SC4503TSKTRT |
| 厂商： | Semtech |
| 文件页数： | 14/22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.)
Figures 7(a)-7(c) show the effects of different values of
inductance and feed-forward capacitance on transient re-
sponses. In a battery-operated system if C 4 is optimized for
the minimum V IN and the maximum load step, the converter
will be stable over the entire input voltage range.
V OUT
0.5V/div
I L1
0.5A/div
40 μ s/div
(a) L 1 = 5.6 μ H and C 4 = 2.2pF
Board Layout Considerations
In a step-up switching regulator, the output ? lter capacitor,
the main power switch and the rectifying diode carry pulse
currents with high di/dt. For jitter-free operation, the size of
the loop formed by these components should be minimized.
Since the power switch is integrated inside the SC4503,
grounding the output ? lter capacitor next to the SC4503
ground pin minimizes size of the high di/dt current loop.
The input bypass capacitors should also be placed close to
the input pins. Shortening the trace at the SW node reduces
the parasitic trace inductance. This not only reduces EMI
but also decreases switching voltage spikes.
Figure 8 shows how various external components are
placed around the SC4503.
The large surrounding ground plane acts as a heat sink
for the device.
V OUT
0.5V/div
I L1
0.5A/div
VOUT
D1
SW
L1
VIN
JP
40 μ s/div
R1
C4
C2
U1
C1
(b) L 1 = 5.6 μ H and C 4 = 3.3pF
R2
FB
C3
R3
SHDN/SS
GND
V OUT
0.5V/div
Figure 8. Suggested PCB Layout for the SC4503.
I L1
0.5A/div
40 μ s/div
(c) L 1 = 3.3 μ H and C 4 = 2.7pF
Figure 7. Different inductances and feed-forward capaci-
tances affect the load transient responses of the
3.3V to 12V step-up converter in Figure 10(a).
I OUT is switched between 90mA and 280mA.
? 2007 Semtech Corp.
14
www.semtech.com
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相关代理商/技术参数 |
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| 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 |
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