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参数资料
| 型号： | MAX6331TUR-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT PREC 3.3V SOT-23-3 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 基准类型： | 旁路，精度 |
| 输出电压： | 3.3V |
| 容差： | ±1.5% |
| 输入电压： | 3 V ~ 200 V |
| 通道数： | 1 |
| 电流 - 阴极： | 100µA |
| 电流 - 输出： | 50mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 带卷 (TR) |
Precision Shunt Regulators with Reset
in SOT23-3
resistor used. Ensure that the resistor’s power rating is
adequate, using the following general power equation:
P R = I IN (V IN(max) - V SHUNT )
= I 2 IN R S
= (V IN(max) - V SHUNT ) 2 / R S
_____________Applications Information
Negative-Going V SHUNT Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX6330/
MAX6331 are relatively immune to short-duration nega-
tive-going V SHUNT transients (glitches). Additional
bypass filter capacitance mounted close to the SHUNT
pin provides additional transient immunity.
I LOAD
2mA/div
0
0
V SHUNT
20mV/div
I IN = 2mA, I LOAD = 0 to 1.9mA
V SHUNT IS AC COUPLED
Choosing the Bypass Capacitor, C L
The bypass capacitor (C L ) on the SHUNT pin can sig-
nificantly affect the device’s load-transient response, so
choose it carefully. When a load transient occurs, the
current for this load is diverted from the shunt regulator.
Figure 2. Load-Transient Response with C L = 0.22μF
The maximum load current that can be diverted from
the regulator is:
I LOAD (diverted from regulator)
= I SHUNT(max) - I SHUNT(min)
= 50mA - 100μA
= 49.9mA
The shunt regulator has a finite response to this tran-
sient. The instantaneous requirements of the load
change are met by the charge on C L , resulting in over-
shoot/undershoot on V SHUNT . The magnitude of this
overshoot/undershoot increases with I SHUNT and
decreases with C L . When V SHUNT undershoots, the
I LOAD
2mA/div
0
0
V SHUNT
20mV/div
I IN = 2mA, I LOAD = 0 to 1.9mA,
V SHUNT IS AC COUPLED
shunt current decreases to where it will only draw qui-
escent current (I Q ), and the shunt element turns off. At
this point, V SHUNT will slew toward V IN at the following
rate:
? V SHUNT / ? t = (I IN - I LOAD - 60μA) / C L
Figure 3. Load-Transient Response with C L = 0.033μF
As V SHUNT rises, it will turn on the shunt regulator when
it can sink 100μA of current. A finite response time for
the shunt regulator to start up will result in a brief over-
shoot of V SHUNT before it settles into its regulation volt-
age. Therefore, I LOAD should always be 100μA or more
below I IN , or V SHUNT will not recover to its regulation
point. To prevent this condition, be sure to select the
correct series-resistor R S value (see the Shunt
Regulator section).
Figures 2, 3, and 4 show load-transient responses for
different choices of bypass capacitors on V SHUNT .
These photos clearly illustrate the benefits and draw-
I LOAD
2mA/div
0
0
V SHUNT
20mV/div
I IN = 2mA, I LOAD = 0 to 1.9mA
V SHUNT IS AC COUPLED
backs of the capacitor options. A smaller bypass
Figure 4. Load-Transient Response with C L = 0.0047μF
6
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