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参数资料
| 型号： | SC185QULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 4A 16MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 4A |
| 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： | 16-UFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-MLPQ-UT（3x3） |
| 其它名称： | SC185QULDKR |
SC185
4A Synchronous
POWER MANAGEMENT
Features
Description
Step-Down Regulator
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V IN Range: 2.9 – 5.5V
V OUT Options: 1.0V to 3.3V
Up to 4A Output Current
Ultra-Small Footprint, <1mm Height Solution
1.5MHz Switching Frequency
Optional Power Save Mode Operation
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1μA Shutdown Current
Externally Programmable Soft Start Time
The SC185 is a 4A synchronous step-down regulator
designed to operate with an input voltage range of
2.9V to 5.5V. The device requires only three external
filter components for a complete a step down regulator
solution. The output voltage is factory predetermined
with an available range of 1.0V to 3.3V.
The SC185 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the SC185 operates in PWM mode with fixed 1.5MHz
oscillator frequency, allowing the use of small surface
mount external components. As the load decreases, the
regulator has the option to transition into Power Save
mode maintaining high efficiency or stay in forced PWM
mode operation.
Input Under-Voltage Lockout
Fixed VOUT version
3mm x 3mm x 0.6mm thermally enhanced
MLPQ-UT16 package
voltage protection and under voltage lockout.
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Power Good indicator
Output Over-Voltage, Current Limit Protection operating conditions. The enable pin provides on/off
-40 to +85°C Temperature Range
Pb-free, Halogen free, and RoHS/WEEE compliant
The SC185 offers output short circuit and thermal
protection to safe guard the device under extreme
Over-Temperature Protection control of the regulator. When connected to logic
low, the device enters shutdown and consumes less
than 1uA of current. Other protection features include
programmable soft start with Power Good indicator, over
Applications
The SC185 is available in a thermally-enhanced, 3mm
x 3mm x 0.6mm MLPQ-UT16 package and has a rated
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Desktop Computing
Set-Top Box
LCD TV
Network Cards
Printer
temperature range of -40 to +85°C.
Typical Application Circuit
V IN
C IN
22μF
R 1
1 ?
C 1
0.1μF
1,2
4
PVIN LX
SC185H
AVIN
VOUT
14,15,16
10
L, 1.0μH
C OUT
47μF
V OUT
1.5V
PGOOD
Enable
Mode
7
6
5
9
PGOOD
EN
MODE
SS
PGND
AGND
11,12,13,T
3
C SS
June 18, 2010
1
www.semtech.com
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