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| 型号： | NCV8664D50G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .15A 8-SOIC |
| 标准包装： | 98 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.315V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 150mA |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
NCV8664
IQ(max) ) VI(max) @ Iq
P q JA +
150 o C * TA
PD
Circuit Description
The NCV8664 is a precision trimmed 3.3 V and 5.0 V
fixed output regulator. Careful management of light load
consumption combined with a low leakage process results
in a typical quiescent current of 22 m A. The device has
current capability of 150 mA, with 600 mV of dropout
voltage at full rated load current. The regulation is provided
by a PNP pass transistor controlled by an error amplifier
with a bandgap reference. The regulator is protected by
both current limit and short circuit protection. Thermal
shutdown occurs above 150 ° C to protect the IC during
overloads and extreme ambient temperatures.
Regulator
The error amplifier compares the reference voltage to a
sample of the output voltage (V out ) and drives the base of
a PNP series pass transistor by a buffer. The reference is a
bandgap design to give it a temperature ? stable output.
Saturation control of the PNP is a function of the load
current and input voltage. Over saturation of the output
power device is prevented, and quiescent current in the
ground pin is minimized. The NCV8664 is equipped with
foldback current protection. This protection is designed to
reduce the current limit during an overcurrent situation.
Regulator Stability Considerations
The input capacitor C IN in Figure 2 is necessary for
compensating input line reactance. Possible oscillations
caused by input inductance and input capacitance can be
damped by using a resistor of approximately 1 W in series
with C IN . The output or compensation capacitor, C OUT
helps determine three main characteristics of a linear
regulator: startup delay, load transient response and loop
stability. The capacitor value and type should be based on
cost, availability, size and temperature constraints.
Tantalum, aluminum electrolytic, film, or ceramic
capacitors are all acceptable solutions, however, attention
must be paid to ESR constraints. The aluminum
electrolytic capacitor is the least expensive solution, but, if
the circuit operates at low temperatures ( ? 25 ° C to ? 40 ° C),
both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturer ’s data sheet
usually provides this information. The value for the output
capacitor C OUT shown in Figure 2 should work for most
applications; however, it is not necessarily the optimized
solution. Stability is guaranteed at values C OUT ≥ 10 m F and
ESR ≤ 9 W for 5.0 V version, and C OUT ≥ 22 m F and ESR
≤ 18 W for 3.3 V version, within the operating temperature
range. Actual limits are shown in a graph in the Typical
Performance Characteristics section.
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 3) is:
PD(max) + [VIN(max) * VOUT(min)] @
(eq. 1)
Where:
V IN(max) is the maximum input voltage,
V OUT(min) is the minimum output voltage,
I Q(max) is the maximum output current for the
application, and I q is the quiescent current the regulator
consumes at I Q(max) .
Once the value of P D(Max) is known, the maximum
permissible value of R q JA can be calculated:
(eq. 2)
The value of R q JA can then be compared with those in the
package section of the data sheet. Those packages with
R q JA ’s less than the calculated value in Equation 2 will keep
the die temperature below 150 ° C. In some cases, none of
the packages will be sufficient to dissipate the heat
generated by the IC, and an external heat sink will be
required. The current flow and voltages are shown in the
Measurement Circuit Diagram.
Heat Sinks
For proper heat sinking of the SOIC ? 8 Lead device,
connect pins 5 ? 8 to the heat sink.
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air. Each material in the heat flow path
between the IC and the outside environment will have a
thermal resistance. Like series electrical resistances, these
resistances are summed to determine the value of R q JA :
R q JA + R q JC ) R q CS ) R q SA (eq. 3)
Where:
R q JC = the junction ? to ? case thermal resistance,
R q CS = the case ? to ? heat sink thermal resistance, and
R q SA = the heat sink ? to ? ambient thermal resistance.
R q JA appears in the package section of the data sheet.
Like R q JA , it too is a function of package type. R q CS and
R q SA are functions of the package type, heat sink and the
interface between them. These values appear in data sheets
of heat sink manufacturers. Thermal, mounting, and heat
sinking are discussed in the ON Semiconductor application
note AN1040/D, available on the ON Semiconductor
Website.
http://onsemi.com
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8664D50R2G | 功能描述:低压差稳压器 - LDO NCV8664 SOIC8 FUSED RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8664DT33RKG | 功能描述:低压差稳压器 - LDO ULTRA LOW IQ LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8664DT50RKG | 功能描述:低压差稳压器 - LDO ULTRA LOW IQ LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8664DT50RKG/H | 制造商:ON Semiconductor 功能描述: |
| NCV8664ST33T3G | 功能描述:低压差稳压器 - LDO 3.3V OPTION RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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