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参数资料
| 型号： | ADP170AUJZ-2.8-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.8V .3A TSOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.8V |
| 输入电压： | 最高 3.6V |
| 电压 - 压降（标准）： | 0.066V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小值） |
| 电流 - 限制（最小）： | 400mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | ADP170AUJZ-2.8-R7DKR |
Data Sheet
In this example, the worst-case temperature coefficient
(TEMPCO) over ?40°C to +85°C is assumed to be 15% for an
X5R dielectric. The tolerance of the capacitor (TOL) is assumed
Substituting these values in Equation 1 yields
C EFF = 0.94 μF × (1 ? 0.15) × (1 ? 0.1) = 0.719 μF
ADP170/ADP171
The EN pin active/inactive thresholds are derived from the VIN
voltage. Therefore, these thresholds vary with changing input
voltage. Figure 31 shows typical EN active/inactive thresholds
when the input voltage varies from 1.6 V to 3.6 V.
1.2
1.1
Therefore, the capacitor chosen in this example meets the
minimum capacitance requirement of the LDO over temper-
ature and tolerance at the chosen output voltage.
To guarantee the performance of the ADP170 / ADP171 , it is
imperative that the effects of dc bias, temperature, and toler-
ances on the behavior of the capacitors are evaluated for each
application.
UNDERVOLTAGE LOCKOUT
The ADP170 / ADP171 have an internal undervoltage lockout
circuit that disables all inputs and the output when the input
1.0
0.9
0.8
0.7
0.6
0.5
0.4
EN ACTIVE
EN INACTIVE
voltage is less than approximately 1.2 V. This ensures that the
manner during power-up.
ENABLE FEATURE
The ADP170 / ADP171 use the EN pin to enable and disable the
VOUT pin under normal operating conditions. As shown in
threshold, VOUT turns on. When a falling voltage on EN
crosses the inactive threshold, VOUT turns off.
3.5
3.0
2.5
V IN (V)
Figure 31. Typical EN Pin Thresholds vs. Input Voltage
The ADP170 / ADP171 utilize an internal soft start to limit the
inrush current when the output is enabled. The start-up time
for the 1.8 V option is approximately 120 μs from the time the
EN active threshold is crossed to when the output reaches 90%
of its final value. As shown in Figure 32, the start-up time is
dependent on the output voltage setting.
EN
V OUT = 3.0V
V OUT = 1.8V
2.0
1.5
1.0
1
2
V OUT = 0.8V
0.5
CH1 1.00V
CH2 1.00V
B
W
M20.0μs A CH1
2.72V
T
79.8000μs
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Figure 32. Typical Start-Up Time
V EN
Figure 30. ADP170 / ADP171 Typical EN Pin Operation
As shown in Figure 30, the EN pin has hysteresis built in. This
prevents on/off oscillations that can occur due to noise on the
EN pin as it passes through the threshold points.
Rev. C | Page 13 of 20
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