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参数资料
| 型号： | XC6601B151MR-G |
| 厂商： | Torex Semiconductor Ltd |
| 文件页数： | 12/33页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V .4A SOT25-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.5V |
| 输入电压： | 最高 3 V |
| 电压 - 压降（标准）： | 0.129V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA（最小） |
| 电流 - 限制（最小）： | 400mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-25 |
| 包装： | 带卷 (TR) |
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XC6601 Series
■ OPERATIONAL EXPLANATION (Continued)
<Soft-Start Function>
With the XC6601, the inrush current from V IN to V OUT for charging C L at start-up can be reduced and makes the V IN stable.
The soft-start time is optimized to 240 μ s (TYP.) at V OUT =1.2V internally. Soft-start time is defined as the V OUT reaches 90% of
V OUT(E) from the time when CE H threshold 0.75V is input to the CE pin.
XC6601x121
C IN =C BIAS =1.0μF (ceramic)
V IN =1.5V ,V BIAS =3.6V ,I OUT =1mA ,tr=5.0μs ,Ta=25℃
500
4
450
CE Input Voltage
3
400
2
350
300
1
250
C L =10μF (ceramic)
0
200
150
C L =4.7μF (ceramic)
-1
-2
100
50
0
Inrush Current
-3
-4
0
100
200
300
400
500
Time (μs)
Figure2: Example of the inrush current wave form at IC start-up.
Figure3: Timing chart at IC start-up
< C L High Speed Auto-Discharge >
XC6601 series can quickly discharge the electric charge at the output capacitor (C L ) when a low signal to the EN pin which
enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor located between the V OUT pin and the V SS
pin. When the IC is disabled, electric charge at the output capacitor (C L ) is quickly discharged so that it could avoids malfunction.
At that time, CL discharge resistance is depended on a bias voltage. Discharge time of the output capacitor (C L ) is set by the C L
auto-discharge resistance (R) and the output capacitor (C L ). By setting time constant of a C L auto-discharge resistance value [R]
and an output capacitor value (C L ) as τ ( τ =C x R), the output voltage after discharge via the N channel transistor is calculated
by the following formulas.
V = V OUT x e –t/ τ , or ｔ = τ ln （ V OUT(E) / V ）
V : Output voltage after discharge, V OUT(E) : Output voltage, t: Discharge time,
τ : C L auto-discharge resistance R × Output capacitor (C L ) value C
<Current Limit, Short-Circuit Protection>
The XC6601 series’ fold-back circuit operates as an output current limiter and a short protection of the output pin. When the load
current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. When the output pin is
shorted to the V SS level, current flows about 80mA.
<Thermal Shutdown Circuit (TSD) >
When the junction temperature of the built-in driver transistor reaches the temperature limit level (150 ℃ TYP.), the thermal
shutdown circuit operates and the driver transistor will be set to OFF. The IC resumes its operation when the thermal shutdown
function is released and the IC’s operation is automatically restored because the junction temperature drops to the level of the
thermal shutdown release temperature (125 ℃ TYP.).
12/33
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