- 您现在的位置：买卖IC网 > Datasheet目录879 > SC202MLTRT (Semtech)CONVERTER DC/DC 3.3V OUT 500MA Datasheet资料下载
参数资料
| 型号： | SC202MLTRT |
| 厂商： | Semtech |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | CONVERTER DC/DC 3.3V OUT 500MA |
| 标准包装： | 1 |
| 系列： | SC202 |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 2.9V |
| 电压 - 输入（最大）： | 5.5V |
| Voltage - Output 1： | 0.8 ~ 3.3 V |
| 电流 - 输出（最大）： | 500mA |
| 电源（瓦） - 制造商系列： | 1.65W |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 13-VFQFN 裸露焊盘 |
| 尺寸/尺寸： | 0.12" L x 0.10" W x 0.04" H（3.0mm x 2.5mm x 1.0mm） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 电源（瓦特）- 最大： | 1.65W |
| 其它名称： | SC202MLDKR |
NOT RECOMMENDED FOR NEW DESIGN
Applications Information (continued)
SC202
Load
Demand
( I OUT )
V OUT +2.5%
V OUT
V OUT -2%
V LX
OFF
BURST
PSAVE
EXIT
Over-Voltage Protection
Over-voltage protection ensures the output voltage does
not rise to a level that could damage its load. When V OUT
exceeds the regulation voltage by 15%, the PWM drive is
disabled. Switching does not resume until V OUT has fallen
below the regulation voltage by 2%.
Current Limit
The SC202 switching stage is protected by a current limit
function. If the output load exceeds the PMOS current
limit for 32 consecutive switching cycles, the device enters
fold-back current limit mode and the output current is
PWM Mode at PSAVE Mode at PWM Mode at
Medium/High Light Load Medium/High
Load Load
Time
Figure 2 — Transitions Between PWM and PSAVE Modes
Protection Features
The SC202 provides the following protection features:
limited to approximately 150mA. Under these conditions,
the output voltage will be the product of I FB-LIM and the load
resistance. The load must fall below I FB-LIM for the device to
exit fold-back current limit mode. This function makes the
device capable of sustaining an indefinite short circuit on
its output under fault conditions.
Thermal Shutdown
?
?
?
?
?
Soft-Start Operation
Over-Voltage Protection
Current Limit
Thermal Shutdown
Under-Voltage Lockout
The SC202 has a thermal shutdown feature to protect the
device if the junction temperature exceeds 160°C. During
thermal shutdown, the PMOS and NMOS switches are
both disabled, tri-stating the LX output. When the junc-
tion temperature drops by the hysteresis value (20°C), the
device goes through the soft-start process and resumes
Soft-Start
The soft-start sequence is activated after a transition from
an all zeros CTL code to a non-zero CTL code enables the
device. At start-up, the PMOS current limit is stepped
through four levels: 25%, 40%, 60%, and 100%. Each step
is maintained for 60μs following an internal reference start
up of 20μs, resulting in a total nominal start-up period of
260μs. If V OUT reaches 90% of the target within the first 2
steps, the device continues in PSAVE mode at the end of
normal operation.
Under-Voltage Lockout
UVLO (Under-Voltage Lockout) activates when the supply
voltage drops below the falling UVLO threshold. This pre-
vents the device from entering an ambiguous state in
which regulation cannot be maintained. Hysteresis of
approximately 200mV is included to prevent chattering
near the threshold.
soft-start; otherwise, it goes into PWM mode. Note the
V OUT ripple in PSAVE mode can be larger than the ripple in
PWM mode.
14
相关PDF资料 |
PDF描述 |
|---|---|
| SC2220-R42 | INDUCTOR SMD 0.42UH 4.8A1MHZ |
| SC2506-6R8 | INDUCTOR SMD 6.8UH 1.30A 100KHZ |
| SC31-680 | INDUCTOR SMD 68UH 0.13A 1MHZ |
| SC312MF-6R8 | INDUCTOR SMD 6.8UH 1.10A 100KHZ |
| SC32-8R2 | INDUCTOR SMD 8.2UH 0.77A 7.96MHZ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC-2030 | 制造商:Nidec Copal 功能描述:SWIT ROTARY 10 MINUS SLOT PC PINS 0.1A 5VDC - Bulk 制造商:Nidec Copal 功能描述:Switch, rotary, min, PCB, 0-9, comp,pcb |
| SC-2030B | 制造商:Nidec Copal 功能描述:SWIT ROTARY 10 MINUS SLOT GW 0.1A 5VDC - Bulk 制造商:Nidec Copal 功能描述:Switch, rotary, min, PCB, 0-9, comp,sur |
| SC-2030TB | 制造商:Nidec Copal 功能描述:SWIT ROTARY 10 SLOT SHAFT PC PINS 0.1A 5VDC - Tape and Reel |
| SC-2030W | 制造商:Nidec Copal 功能描述:SWIT ROTARY 10 SLOT SHAFT PC PINS 0.1A 5VDC - Trays |
| SC-2031 | 制造商:Nidec Copal 功能描述:SWIT ROTARY 10 MINUS SLOT PC PINS 0.1A 5VDC - Bulk 制造商:Nidec Copal 功能描述:Switch, rotary, min, PCB, 0-9, comp,pcb |
发布紧急采购，3分钟左右您将得到回复。