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参数资料
| 型号： | MAX667ESA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ .25A 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 5V，1.3 V ~ 16 V |
| 输入电压： | 3.5 V ~ 16.5 V |
| 电压 - 压降（标准）： | 0.15V @ 250mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 250mA（最小） |
| 工作温度： | -40°C ~ 85°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-SOIC |
| 包装： | 带卷 (TR) |
+5V/Programmable Low-Dropout
Voltage Regulator
800
CIRCUIT OF
400
T A = +50 ? C
600
400
FIGURE 7
300
200
GUARANTEED 250mA
CIRCUIT OF
200
FIGURE 6
100
SO PACKAGE
DIP PACKAGE
DISSIPATION LIMIT
0
0
DISSIPATION LIMIT
1
2
3
4
5
6
0
5
10
15
VIN (V)
Figure 9. Quiescent Current Below Dropout with Connections
of Figures 6 and 7
PNP transistor is turned on fully as regulation is lost.
Even with a load current of a few microamperes, the
base current will be driven above 5mA. Figure 8 shows
how this base current may be significant.
Consequently, a mostly discharged battery can be fur-
ther discharged at end-of-life.
Figure 6 shows how this condition can be modified by
connecting DD to SHDN with a 47k Ω resistor, R1, paral-
leled with a 0.1μF capacitor to GND. This modification
reduces the no-load quiescent current to approximately
160μA when dropout is reached (Figure 9), but increas-
es the dropout voltage by about 0.1V. The output volt-
age drops to approximately 3V once DD begins to
activate SHDN, but it does not fall to zero because
SHDN is only partially activated.
A second alternate connection (Figure 7) further
reduces quiescent current near the dropout voltage,
compared to the circuit in Figure 6. The output must be
set with external resistors (R1, R2), so DD lowers the
output voltage as the input voltage falls by sourcing
current into SET via R3. Quiescent current remains low
for inputs down to 3.5V, and peaks before falling to 0 at
low input voltages. Although the current peak is higher
than with the connection in Figure 6, this may be more
useful because the quiescent current peaks at an input
voltage well below the useful range of most batteries
(Figure 9). Also, as IN falls below 5V, OUT tracks IN
minus the dropout voltage. This connection still allows
separate use of the SHDN input.
Power Dissipation
The MAX667 can regulate currents as high as 250mA
and withstand input-output differential voltages as high
VIN-VOUT (V)
Figure 10. MAX667 Load Current vs. Input-Output Differential
Voltage
+10V
INPUT
+2V/div
+6V
+5V OUTPUT
+0.2V/div
1ms/div
Figure 11. Output Response to +4V/100μs Input Step
as 15.2V, but not simultaneously. The maximum power
dissipation is dependent on the package and the tem-
perature (see Absolute Maximum Ratings ). Figure 10
shows the maximum output current at various input-out-
put differential voltages for the plastic DIP and SO
packages. The MAX667 can withstand short-circuit
loads up to 1 second.
Operation from AC Sources
The MAX667 is a micropower CMOS regulator intended
principally for battery operation. When operating from
AC sources, consider power-supply ripple rejection.
The MAX667’s error amplifier produces very low gain
bandwidth, and the input power-supply rejection ratio
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX667MJA | 功能描述:低压差稳压器 - 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 |
| MAX667MJA/883B | 功能描述:低压差稳压器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX667MSA/PR | 功能描述:低压差稳压器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX667MSA/PR-T | 功能描述:低压差稳压器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX6680MEE | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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