- 您现在的位置：买卖IC网 > PDF目录4781 > ADP320ACPZ331815R7 (Analog Devices Inc)IC REG LDO 3.3/1.8/1.5V 16LFCSP PDF资料下载
参数资料
| 型号： | ADP320ACPZ331815R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3/1.8/1.5V 16LFCSP |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V，1.8V，1.5V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.11V @ 200mA，-，- |
| 稳压器数量： | 3 |
| 电流 - 输出： | 200mA（最小值） |
| 电流 - 限制（最小）： | 250mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-WQ（3x3） |
| 包装： | 标准包装 |
| 其它名称： | ADP320ACPZ331815R7DKR |
ADP320
CURRENT-LIMIT AND THERMAL OVERLOAD
PROTECTION
The ADP320 triple LDO is protected against damage due to
excessive power dissipation by current and thermal overload
protection circuits. The ADP320 triple LDO is designed to
current limit when the output load reaches 300 mA (typical).
When the output load exceeds 300 mA, the output voltage is
reduced to maintain a constant current limit.
Thermal overload protection is built-in, which limits the
junction temperature to a maximum of 155°C (typical). Under
extreme conditions (that is, high ambient temperature and
power dissipation) when the junction temperature starts to
To guarantee reliable operation, the junction temperature of
the ADP320 triple LDO must not exceed 125°C. To ensure that
the junction temperature stays below this maximum value, the
user needs to be aware of the parameters that contribute to junction
temperature changes. These parameters include ambient tem-
perature, power dissipation in the power device, and thermal
resistances between the junction and ambient air (θ JA ). The θ JA
number is dependent on the package assembly compounds used
and the amount of copper to which the GND pins of the package
are soldered on the PCB. Table 6 shows typical θ JA values for the
ADP320 triple LDO for various PCB copper sizes.
Table 6. Typical θ JA Values
rise above 155°C, the output is turned off, reducing the output
current to zero. When the junction temperature drops below
140°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 VOUTx to GND
Copper Size (mm 2 )
JEDEC 1
100
500
1000
ADP320 Triple LDO (°C/W)
49.5
83.7
68.5
64.7
occurs. At first, the ADP320 triple LDO current limits, so that
1
Device soldered to JEDEC standard board.
only 300 mA is conducted into the short. If self-heating of the
junction is great enough to cause its temperature to rise above
155°C, thermal shutdown activates turning off the output and
The junction temperature of the ADP320 triple LDO can be
calculated from the following equation:
reducing the output current to zero. As the junction tempera-
ture cools and drops below 140°C, the output turns on and
conducts 300 mA into the short, again causing the junction
temperature to rise above 155°C. This thermal oscillation
between 140°C and 154°C causes a current oscillation between
0 mA and 300 mA that continues as long as the short remains
at the output.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For reliable
operation, device power dissipation must be externally limited
so junction temperatures do not exceed 125°C.
THERMAL CONSIDERATIONS
In most applications, the ADP320 triple LDO does not dissipate
a lot of heat due to high efficiency. However, in applications
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 = Σ[( V IN ? V OUT ) × I LOAD ] + Σ( V IN × I GND )
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
T J = T A + {Σ[( V IN ? V OUT ) × I LOAD ] × θ JA }
(2)
(3)
(4)
with a high ambient temperature and high supply voltage to out-
put voltage differential, the heat dissipated in the package is
large enough that it can cause the junction temperature of the
die to exceed the maximum junction temperature of 125°C.
When the junction temperature exceeds 155°C, the converter
enters thermal shutdown. It recovers only after the junction
temperature has decreased below 140°C to prevent any permanent
damage. Therefore, thermal analysis for the chosen application
is very important to guarantee reliable performance over all
conditions. The junction temperature of the die is the sum of
the ambient temperature of the environment and the tempera-
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 the junction temperature does not rise
above 125°C. Figure 47 to Figure 50 show junction temperature
calculations for different ambient temperatures, total power
dissipation, and areas of PCB copper.
In cases where the board temperature is known, the thermal
characterization parameter, Ψ JB , may be used to estimate the
junction temperature rise. T J is calculated from T B and P D using
the formula
ture rise of the package due to the power dissipation, as shown
in Equation 2.
T J = T B + ( P D × Ψ JB )
The typical Ψ JB value for the 16-lead 3 mm × 3 mm LFCSP is
(5)
25.2°C/W.
Rev. A | Page 17 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| EMM28DTKT-S288 | CONN EDGECARD 56POS .156 EXTEND |
| ADP220ACBZ-2812R7 | IC REG LDO 2.8V/1.2V .2A 6WLCSP |
| ADP220ACBZ275275R7 | IC REG LDO 2.75V .2A 6WLCSP |
| ACM18DRMN-S288 | CONN EDGECARD EXTEND 36POS 0.156 |
| ADP220ACBZ-2827R7 | IC REG LDO 2.8V/2.7V .2A 6WLCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3210 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit Programmable Multiphase Mobile CPU Synchronous |
| ADP3210MNR2G | 功能描述:DC/DC 开关控制器 IMVP6.5 BUCK CONTROLLER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ADP3211 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit, Programmable, Single-Phase, Synchronous Buck Controller |
| ADP32110091MNR2G | 制造商:ON Semiconductor 功能描述:ONSADP32110091MNR2G IMVP6.5 BUCK CONTROL |
| ADP3211AMNR2G | 功能描述:DC/DC 开关控制器 IMVP6.5 BCK CTRL RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。