参数资料
| 型号： | ADP172ACBZ-2.9-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.9V .3A 4WLCSP |
| 产品变化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.9V |
| 输入电压： | 最高 3.6V |
| 电压 - 压降（标准）： | 0.05V @ 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 ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-UFBGA，WLCSP |
| 供应商设备封装： | 4-WLCSP |
| 包装： | 带卷 (TR) |
ADP172
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
Data Sheet
The junction temperature of the ADP172 can be calculated
from the following equation:
The ADP172 is protected against damage due to excessive
power dissipation by current and thermal overload protection
circuits. The ADP172 is designed to limit the current when the
output load reaches 450 mA (typical). When the output load
exceeds 450 mA, the output voltage is reduced to maintain a
constant current limit.
T J = T A + ( P D × θ JA )
where:
T A is the ambient temperature.
P D is the power dissipation in the die, given by
P D = [( V IN ? V OUT ) × I LOAD ] + ( V IN × I GND )
(2)
(3)
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 dissip-
ation), when the junction temperature starts to rise above 150°C,
the output is turned off, reducing the output current to 0. When
the junction temperature drops below 135°C, the output is turned
on again, and output current is restored to its nominal value.
Consider the case where a hard short from VOUT to GND occurs.
At first, the ADP172 limits the current so that only 450 mA is
conducted into the short. If self-heating of the junction is great
enough to cause its temperature to rise above 150°C, thermal
shutdown activates, turning off the output and reducing the
output current to 0. As the junction temperature cools and
drops below 135°C, the output turns on and conducts 450 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 450 mA and 0 mA, which
continues as long as the short remains at the output.
where:
I LOAD is the load current.
I GND is the ground current.
V IN and V OUT are input and output voltages, respectively.
Power dissipation due to ground current is quite small and can
be ignored. Therefore, the junction temperature equation
simplifies to the following:
T J = T A + {[( V IN ? V OUT ) × I LOAD ] × θ JA } (4)
As shown in Equation 4, for a given ambient temperature, input-
to-output voltage differential, and continuous load current,
there exists a minimum copper size requirement for the PCB to
ensure that the junction temperature does not rise above 125°C.
for different ambient temperatures, load currents, V IN to V OUT
differentials, and areas of PCB copper.
140
T J MAX
120
Current and thermal limit protections are intended to protect
the device against accidental overload conditions.
THERMAL CONSIDERATIONS
To guarantee reliable operation, the junction temperature of the
ADP172 must not exceed 125°C. To ensure that the junction temp-
erature stays below this maximum value, the user must be aware
of the parameters that contribute to junction temperature changes.
These parameters include ambient temperature, power
100
80
60
40
20
I LOAD = 300mA
I LOAD = 200mA
I LOAD = 100mA
I LOAD = 50mA
I LOAD = 10mA
I LOAD = 1mA
dissipation in the power device, and thermal resistances between
the junction and ambient air (θ JA ). The θ JA number is dependent
0
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
on the package assembly compounds used and the amount of
copper to which the GND pin of the package is soldered on the
PCB. Table 6 shows typical θ JA values of the 4-ball WLCSP package
for various PCB copper sizes.
Table 6. Typical θ JA Values
V IN – V OUT (V)
Figure 30. 500 mm 2 of PCB Copper, T A = 25°C
Copper Size (mm 2 )
50
100
300
500
θ JA (°C/W)
260
159
157
153
151
1
Device soldered to minimum size pin traces.
Rev. D | Page 14 of 20
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相关代理商/技术参数 |
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| ADP172ACBZ-3.0-R7 | 功能描述:IC REG LDO 3V .3A 4WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 其它有关文件:LD39015JXX12 View All Specifications 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:1.2V 输入电压:1.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-WFBGA，FCBGA 供应商设备封装:4-覆晶（1.07x1.07） 包装:Digi-Reel® 其它名称:497-11958-6 |
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| ADP172CB-1.2-EVALZ | 制造商:Analog Devices 功能描述:EVAL BRD SINGLE 300MA LDO W/A LOW VIN - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:EVAL BOARD FOR ADP172 制造商:Analog Devices 功能描述:Eval brd Single 300mA LDO w/a low VIN |
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