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| 型号： | XC9235A33DER-G |
| 厂商： | Torex Semiconductor Ltd |
| 文件页数： | 14/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 0.6A USP-6 |
| 标准包装： | 3,000 |
| 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 V ~ 6 V |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 600mA |
| 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 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | USP-6C |
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XC9235/XC9236/XC9237 Series
■ OPERATIONAL DESCRIPTION (Continued)
<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V OUT pin (refer to FB point in
the block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when
the FB point voltage decreases less than half of the reference voltage (Vref) and a current more than the I LIM flows to
the Pch MOS driver transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor.
For the D/E/F/G series, it does not matter how much the current limit, once the FB voltage become less than the
quarter of reference voltage (V REF ), the short-circuit protection operates to latch the Pch MOS driver transistor. In
latch mode, the operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring
power supply to the V IN pin.
When sharp load transient happens, a voltage drop at the V OUT is propagated to the FB point through C FB , as a result,
short circuit protection may operate in the voltage higher than 1/2 V OUT voltage.
<UVLO Circuit>
When the V IN pin voltage becomes 1.4V or lower, the Pch MOS driver transistor output driver transistor is forced OFF to
prevent false pulse output caused by unstable operation of the internal circuitry. When the V IN pin voltage becomes 1.8V
or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to
initiate output startup operation. The soft start function operates even when the V IN pin voltage falls momentarily below
the UVLO operating voltage. The UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to
be suspended; therefore, the internal circuitry remains in operation.
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (I PFM ), the IC keeps the Pch MOS driver transistor
on. In this case, time that the Pch MOS driver transistor is kept on (TON) can be given by the following formula.
t ON = L × I PFM / (V IN ? V OUT ) → I PFM ①
< PFM Duty Limit >
In PFM control operation, the PFM duty limit ( DTY LIMIT_PFM ) is set to 200% (TYP.). Therefore, under the condition that the
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for Pch MOS driver transistor to be turned
off even when coil current doesn’t reach to I PFM . → I PFM ②
14/34
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XC9235A33DMR-G | 功能描述:IC REG BUCK SYNC 3.3V SOT25-5 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:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| XC9235B08C4R-G | 制造商:TOREX 制造商全称:Torex Semiconductor 功能描述:600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters |
| XC9235B08CER | 制造商:TOREX 制造商全称:Torex Semiconductor 功能描述:600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters |
| XC9235B08CER-G | 制造商:TOREX 制造商全称:Torex Semiconductor 功能描述:600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters |
| XC9235B08CMR | 制造商:TOREX 制造商全称:Torex Semiconductor 功能描述:600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters |
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