参数资料
| 型号： | SC4501MLTRT |
| 厂商： | Semtech |
| 文件页数： | 13/21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
The turn off voltage is:
V L = V H ? V HYS = 2 . 75 ? 0 . 69 = 2 . 06 V > 1 . 4 V .
IN
6/8
Frequency Compensation
R3
I HYS
4.6 μ A
SWITCH CLOSED
WHEN Y = “1”
Figure 8 shows the equivalent circuit of a boost converter
using the SC4501. The output filter capacitor and the load
form an output pole at frequency:
SHDN
3
+
Y
ω p 2 = ?
2 I OUT
V OUT C 2
= ?
2
R OUT C 2
(13)
R4
1.1V
-
COMPARATOR
where C 2 is the output capacitor and R OUT =
V OUT
I OUT
is the
SC4501
Figure 7. Programmable Hysteretic UVLO Circuit
with V L > 1 . 4 V .
equivalent load resistance.
The zero formed by C 2 and its equivalent series resistance
(ESR) is neglected due to low ESR of the ceramic output
capacitor.
There is also a right half plane (RHP) zero at angular
frequency:
Example: Increase the turn on voltage of a V IN = 3.3V boost
converter from 1.4V to 2.75V.
Using V H = 2.75V and R 4 = 100K Ω in (12),
ω Z 2 =
R OUT ( 1 ? D ) 2
L
(14)
R 3 = 150 K Ω .
The resulting UVLO hysteresis is:
ω z2 decreases with increasing duty cycle D and increasing
I OUT . Using the 5V to 12V boost regulator (1.35MHz) in
Figure 1(a) as an example,
V HYS = I HYS R 3 = 4 . 6 μ A ? 150 K Ω = 0 . 69 V .
R OUT ≥
5 V
0 . 74 A
= 6 . 8 Ω
IN
V
POWER
STAGE
I
OUT
VOUT
C5
R1
ESR
R OUT
C2
COMP
Gm
-
FB
+
C6
R3
RO
1.242V
R2
C4
VOLTAGE
REFERENCE
Figure 8. Simplified Block Diagram of a Boost Converter
2011
? 2005 Semtech Corp.
13
www.semtech.com
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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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