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| 型号： | SC120SKTRT |
| 厂商： | Semtech |
| 文件页数： | 20/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V/ADJ SOT23-6 |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.8 V ~ 5 V |
| 输入电压： | 0.7 V ~ 4.5 V |
| 频率 - 开关： | 1.2MHz |
| 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： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC120SKDKR |
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SC120
Applications Information
Detailed Description
The SC120 is a synchronous step-up Pulse Width
Modulated (PWM) DC-DC converter utilizing a 1.2MHz
fixed frequency current mode architecture. It is designed
to provide output voltages in the range 1.8V to 5.0V from
an input voltage as low as 0.7V, with a (output unloaded)
to ground and is increasing. When the n-channel FET is
turned off and the p-channel FET is turned on (known as
the off-state), the inductor is then connected between IN
and OUT. The (now decreasing) inductor current flows
from the input to the output, boosting the output voltage
above the input voltage.
start up input voltage of 0.85V.
Output Voltage Selection
The device operates in two modes: PWM and automatic
PSAVE mode. In PWM operation, the devices uses pulse
width modulation control to regulate the output under
moderate to heavy load conditions. It switches to PSAVE
mode when lightly loaded. Quiescent current consump-
tion is as little as 50μA, into the OUT pin, when in PSAVE
mode.
The regulator control circuitry is shown in the Block
Diagram. It is comprised of a programmable feedback
controller, an internal 1.2MHz oscillator, an n-
The SC120 output voltage can be programmed to an
internally preset value or it can be programmed with
external resistors. The output is internally programmed
to 3.3V when the FB pin is connected to GND. Any output
voltage in the range 1.8V to 5.0V can be programmed
with a resistor voltage divider between OUT and the FB
pin as shown in Figure 1.
The values of the resistors in the voltage divider network
are chosen to satisfy the equation
channel Field Effect Transistor (FET) between the LX and
GND pins, and a p-channel FET between the LX and OUT
pins. The current flowing through both FETs is monitored
V OUT
1 . 2
1
R 1
R 2
V
.
and limited as required for startup, PWM operation, and
PSAVE operation. An external inductor must be connected
between the IN pin and the LX pin. When the n-channel
FET is turned on, the LX pin is internally grounded, con-
necting the inductor between IN and GND. This is called
the on-state. During the on-state, inductor current flows
IN
L1
A large value of R 2 , ideally 590kΩ or larger, is preferred for
stability for V IN within approximately 400mV of V OUT . For
lower V IN , lower resistor values can be used. The values of
R 1 and R 2 can be as large as desired to achieve low quies-
cent current.
LX
EN
OUT
R 1
C FB
V OUT
C IN
GND
SC120
FB
R 2
C OUT
Figure 1 — Output Voltage Feedback Circuit
20
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相关代理商/技术参数 |
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| SC120ULTRT | 功能描述:IC REG BOOST SYNC 3.3V/ADJ 6MLPD 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 |
| SC120-W13 | 制造商:GardTec Inc 功能描述:SC Series 107 mm Steel Bright Nickel Chrome 4 Place Screw Mount Fan Guard |
| SC120-W14 | 制造商:GardTec Inc 功能描述:SC Series 120 mm Steel Bright Nickel Chrome 4 Place Screw Mount Fan Guard |
| SC120-W14SS | 制造商:PRIVATE LABEL 功能描述:120MM WIRE FAN GUARD, 304 STAINLESS STEEL". |
| SC120-W2 | 制造商:GardTec Inc 功能描述:SC Series 115.6 mm Steel Bright Nickel Chrome 2 Place Screw Mount Fan Guard |
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