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参数资料
| 型号： | ADP150CB-3.3-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 3.3V WLCSP |
| 设计资源： | Broadband Low EVM Direct Conversion Transmitter (CN0134) Broadband Low EVM Direct Conversion Transmitter Using LO Divide-by-2 Modulator (CN0144) Using low noise linear drop-out regulators to power wideband PLL & VCO IC's (CN0147) |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 150mA |
| 输入电压： | 2.2 ~ 5.5V |
| 稳压器类型： | 正，固定式 |
| 工作温度： | -40°C ~ 125°C |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP150 |
Data Sheet
To guarantee the performance of the ADP150, it is imperative
that the effects of the dc bias, temperature, and tolerances on
the behavior of the capacitors be evaluated for each.
UNDERVOLTAGE LOCKOUT
The ADP150 has an internal undervoltage lockout circuit that
disables all inputs and the output when the input voltage is less
than approximately 2.0 V. This ensures that the ADP150 inputs
and output behave in a predictable manner during power-up.
ENABLE FEATURE
The ADP150 uses the EN pin to enable and disable the VOUT
when a rising voltage on EN crosses the active threshold, V OUT
turns on. When a falling voltage on EN crosses the inactive
threshold, V OUT turns off.
3.5
3.0
ADP150
The ADP150 uses an internal soft start to limit the inrush current
when the output is enabled. The start-up time for the 3.3 V
option is approximately 150 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.
T
EN
V OUT = 3.3V
V OUT = 2.8V
V OUT = 1.8V
1 1
CH1 1V
CH2 1V
M40.0μs
A CH1
3.24V
2.5
CH3 1V
CH4 1V
T
240.000ns
Figure 32. Typical Start-Up Time
2.0
1.5
1.0
0.5
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
The ADP150 is protected against damage due to excessive
power dissipation by current and thermal overload protection
circuits. The ADP150 is designed to limit current when the
output load reaches 260 mA (typical). When the output load
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
exceeds 260 mA, the output voltage is reduced to maintain a
V EN
Figure 30. 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.
The EN pin active/inactive thresholds are derived from the VIN
voltage; therefore, these thresholds vary with changing input
voltage. Figure 31 shows the typical EN active/inactive thresholds
when the input voltage varies from 2.2 V to 5.5 V.
1.1
constant current limit.
Thermal overload protection is included, which limits the junction
temperature to a maximum of 150°C (typical). Under extreme
conditions (that is, high ambient temperature and power dissipation)
when the junction temperature starts to rise above 150°C, the
output is turned off, reducing the output current to zero. When
the junction temperature drops below 135°C, the output is turned
on again and the output current is restored to its nominal value.
Consider the case where a hard short from VOUT to GND occurs.
At first, the ADP150 limits current so that only 260 mA is
conducted into the short. If self-heating of the junction is great
1.0
0.9
0.8
0.7
0.6
0.5
RISING
FALLING
enough to cause its temperature to rise above 150°C, thermal
shutdown activates, turning off the output and reducing the
output current to zero. As the junction temperature cools and
drops below 135°C, the output turns on and conducts 260 mA
into the short, again causing the junction temperature to rise
above 150°C. This thermal oscillation between 135°C and 150°C
causes a current oscillation between 260 mA and 0 mA that
continues as long as the short remains at the output.
Current and thermal limit protections are intended to protect
0.4
2.3
2.8
3.3
3.8
4.3
4.8
5.3
5.5
the device against accidental overload conditions. For reliable
operation, device power dissipation must be externally limited
V IN (V)
so that the junction temperatures do not exceed 125°C.
Figure 31. Typical EN Pin Thresholds vs. Input Voltage (V IN )
Rev. B | Page 13 of 20
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