参数资料
| 型号： | SC4501MLTRT |
| 厂商： | Semtech |
| 文件页数： | 15/21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
frequency. However it reduces the phase margin. The
values of R 3 and C 4 can be determined empirically by
observing the inductor current and the output voltage
during load transient. Compensation is optimized when
the largest R 3 and the smallest C 4 without producing
ringing or excessive overshoot in its inductor current and
output voltage are found. Figures 10(b), 11(c), 12(b) and
12(c) show load transient responses of empirically
optimized DC-DC converters. In a battery-operated
system, compensating for the minimum V IN and the
maximum load step will ensure stable operation over the
entire input voltage range.
C 5 adds a feedforward zero to the loop response. In some
cases it improves the transient speed of the converter. C 6
rolls off the gain at high frequency. This helps to stabilize
the loop. C 5 and C 6 are often not needed.
Board Layout Considerations
In a step-up switching regulator, the output filter capacitor,
the main power switch and the rectifying diode carry
switched currents with high di/dt. For jitter-free operation,
Typical Application Circuits
the size of the loop formed by these components should
be minimized. Since the power switch is integrated inside
the SC4501, grounding the output filter capacitor next to
the SC4501 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 the sizes of the
switching voltage spikes and glitches.
Figure 9 shows how various external components are placed
around the SC4501. The frequency-setting resistor should
be placed near the ROSC pin with a short ground trace
on the PC board. These precautions reduce switching
noise pickup at the ROSC pin.
To achieve a junction to ambient thermal resistance ( θ JA )
of 40°C/W, the exposed pad of the SC4501 should be
properly soldered to a large ground plane. Use only 12mil
diameter vias in the ground plane if necessary. Avoid using
larger vias under the device. Molten solder may seep
through large vias during reflow, resulting in poor adhesion,
poor thermal conductivity and low reliability.
VIN
3.3V
6
L1
3.3 μ H
5
D1
10BQ015
R1
174K
VOUT
12V, 0.4A
OFF ON 3
IN
SHDN
SW
FB
2
C1
2.2 μ F
C3
47nF
8
SC4501
SS COMP
GND ROSC
4 7
1
R4
9.31K
R3
22.1K
C4
1.5nF
R2
20K
C2
10 μ F
40 μ s/div
L1: Cooper-Bussmann SD25-3R3
Figure 10(a). 1.35 MHz All Ceramic Capacitor 3.3V to 12V Boost
Converter. Pinout Shown is for MSOP-8
Upper Trace : Output Voltage, AC Coupled, 1V/div
Lower Trace : Inductor Current, 0.5A/div
Figure 10(b). Load Transient Response of the Circuit in Figure
10(a). I LOAD is switched between 0.1A and 0.4A at
1A/ μ s.
2011
? 2005 Semtech Corp.
15
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| 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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