参数资料
| 型号： | SC183CULTRT |
| 厂商： | Semtech |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 2A |
| 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-MLPQ |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-MLPQ-UT（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC183CULDKR |
SC183C
Applications Information (continued)
current (I CL_HOLD ) of a few hundred milliampere. Under this
condition, the output voltage will be the product of I CL_HOLD
and the load resistance. The current limit holding current
(I CL_HOLD ) will decrease when the output voltage increases.
The load presented must fall below the current limit
holding current for the part to exit foldback current limit
mode. Figure 2 shows how the typical current limit
holding current varies with output voltage. The SC183C is
capable of sustaining an indefinite short circuit without
damage and will resume normal operation when the fault
is removed. The foldback current limit mode is disabled
during soft-start. The current limit functionality is shown
in Figure 4.
Current Limit Holding Current over Vout
maintained for 200μs following an internal reference
start up of 50μs giving a total nominal startup period of
850μs. During startup, the chip operates by controlling
the inductor current swings between 0A and current
limit. If at any time V OUT reaches 86% of the target or at
the end of the soft-start period, the SC183C will switch
to PWM mode operation. Figure 3 shows the typical
diagram of soft start operation.
The SC183C is capable of starting up into a pre-biased
output. When the output is precharged by another
supply rail, the SC183C will not discharge the output
during the soft start interval.
Shut Down
When all CTL pins are low, the SC183C will run in shut-
300
250
V IN = 3.6V
T A = 25°C
V IN = 5.0V
down mode, drawing less than 1μA from the input power
supply. The internal switches and bandgap voltage will
be immediately turned off.
200
150
100
Thermal Shutdown
The device has a thermal shutdown feature to protect the
SC183C if the junction temperature exceeds 160°C.
50
V IN = 3.3V
During thermal shutdown, the on-chip power devices are
disabled, tri-stating the LX output. When the temperature
0
1.0
1.5
2.0 2.5
Output Voltage (V)
3.0
3.5
drops by 10°C, it will initiate a soft start cycle to resume
normal operation.
Figure 2 — Typical Current Limit Holding Current
Over-Voltage Protection
In the event of a 15% over-voltage on the output, the
PWM drive is disabled with LX pin floating.
Inductor Selection
The SC183C converter has internal loop compensation.
The compensation is designed to work with a output
filter corner frequency of less than 40kHz for a V IN of 5V
and 50kHz for a V IN of 3.3V over any operating condition.
The corner frequency of the output filter can be defined
by Equation 3.
f C =
1
2 π L ? C OUT
(3)
Soft-Start
The soft-start mode is activated after AVIN reaches its
UVLO and one or more CTL pins are set high to enable the
part. A thermal shutdown event will also activate the soft
start sequence. Soft-start mode controls the maximum
current during startup thus limiting in-rush current. The
PMOS current limit is stepped through four soft start levels
of approximately 20%, 25%, 40%, & 100%. Each step is
Values outside this range may lead to instability, malfunc-
tion, or out-of-specification performance.
In general, the inductance is chosen by making the induc-
tor ripple current to be less than 30% of maximum load
current. When choosing an inductor, it is important to
consider the change in inductance with DC bias current.
? 2010 Semtech Corp.
14
www.semtech.com
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| SC185BULTRT | 功能描述:IC REG BUCK SYNC 1V 4A 16MLPQ 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 |
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