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| 型号： | ADP3335ARMZ-2.5-RL72 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.37 V DROPOUT, PDSO8 |
| 封装： | LEAD FREE, MO-187AA, MSOP-8 |
| 文件页数： | 2/16页 |
| 文件大小： | 442K |
| 代理商： | ADP3335ARMZ-2.5-RL72 |
ADP3335
Rev. A | Page 10 of 16
APPLICATION INFORMATION
OUTPUT CAPACITOR SELECTION
As with any micropower device, output transient response is a
function of the output capacitance. The ADP3335 is stable over
a wide range of capacitor values, types, and ESR (anyCAP). A
capacitor as low as 1 F is all that is needed for stability; larger
capacitors can be used if high output current surges are
anticipated. The ADP3335 is stable with extremely low ESR
capacitors (ESR ≈ 0), such as multilayer ceramic capacitors
(MLCC) or organic semiconductor electrolytic capacitors
(OSCON). Note that the effective capacitance of some capacitor
types may fall below the minimum at extreme temperatures.
Ensure that the capacitor provides more than 1 F over the
entire temperature range.
INPUT BYPASS CAPACITOR
An input bypass capacitor is not strictly required, but is advi-
sable in any application involving long input wires or high
source impedance. Connecting a 1 F capacitor from IN to
ground reduces the circuit’s sensitivity to PC board layout. If a
larger value output capacitor is used, then a larger value input
capacitor is also recommended.
NOISE REDUCTION
A noise reduction capacitor (CNR) can be used, as shown in
Figure 24, to further reduce the noise by 6 dB to 10 dB
(Figure 22). Low leakage capacitors in the 100 pF to 1 nF range
provide the best performance. Since the noise reduction pin,
NR, is internally connected to a high impedance node, any con-
nection to this node should be made carefully to avoid noise
pickup from external sources. The pad connected to this pin
should be as small as possible, and long PC board traces are not
recommended.
When adding a noise reduction capacitor, maintain a minimum
load current of 1 mA when not in shutdown.
It is important to note that as CNR increases, the turn-on time
will be delayed. With NR values greater than 1 nF, this delay
may be on the order of several milliseconds.
NR
IN
OUT
GND
SD
ADP3335
ON
OFF
VIN
CIN
1
F
+
VOUT
00147-0-021
1
3
4
7
2
5
6
8
COUT
1
F
CNR
Figure 24. Typical Application Circuit
THERMAL OVERLOAD PROTECTION
The ADP3335 is protected against damage from excessive
power dissipation by its thermal overload protection circuit,
which limits the die temperature to a maximum of 165°C.
Under extreme conditions (i.e., high ambient temperature and
power dissipation) where die temperature starts to rise above
165°C, the output current is reduced until the die temperature
has dropped to a safe level. The output current is restored when
the die temperature is reduced.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For normal
operation, device power dissipation should be externally limited
so that junction temperatures will not exceed 150°C.
CALCULATING JUNCTION TEMPERATURE
Device power dissipation is calculated as follows:
(
)
( )
GND
IN
LOAD
OUT
IN
D
I
V
I
V
P
+
=
Where ILOAD and IGND are load current and ground current, and
VIN and VOUT are input and output voltages, respectively.
Assuming ILOAD = 400 mA, IGND = 4 mA, VIN = 5.0 V, and VOUT =
3.3 V, device power dissipation is
PD = (5 V – 3.3 V)400 mA + 5.0 V(4 mA) = 700 mW
The junction temperature can be calculated from the power
dissipation, ambient temperature, and package thermal
resistance. The thermal resistance is a function not only of the
package, but also of the circuit board layout. Standard test
conditions are used to determine the values published in this
data sheet, but actual performance will vary. For an LFCSP-8
package mounted on a standard 4-layer board, θJA is 48°C/W. In
the above example, where the power dissipation is 700 mW, the
temperature rise above ambient will be approximately equal to
TJA = 0.700 W × 48°C/W = 33.6°C
To limit the maximum junction temperature to 150°C, the
maximum allowable ambient temperature will be
TAMAX = 150°C 33.6°C = 116.4°C
In this case, the resulting ambient temperature limitation is
above the maximum allowable ambient temperature of 85°C.
相关PDF资料 |
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| ADP3335ARMZ-2.85-R72 | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.37 V DROPOUT, PDSO8 |
| ADP3335ARMZ-3.3-RL2 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.37 V DROPOUT, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3335ARMZ-3.3 | 制造商:Analog Devices 功能描述:LDO 3.3V 500MA 8-MSOP 制造商:Analog Devices 功能描述:LDO, 3.3V, 500MA, 8-MSOP 制造商:Analog Devices 功能描述:LDO, 3.3V, 500MA, 8-MSOP, Primary Input Voltage:12V, Output Voltage Fixed:3.3V, 制造商:Analog Devices 功能描述:LDO, 3.3V, 500MA, 8-MSOP, Primary Input Voltage:12V, Output Voltage Fixed:3.3V, Dropout Voltage Vdo:200mV, Voltage Regulator Case Style:MSOP, No. of Pins:8, Output Current:500mA, Operating Temperature Min:-40C, Operating Temperature, RoHS Compliant: Yes |
| ADP3335ARMZ-3.3-RL | 功能描述:IC REG LDO 3.3V .5A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:75 系列:- 稳压器拓扑结构:正，可调式 输出电压:1.2 V ~ 37 V 输入电压:4.2 V ~ 40 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:500mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-3，DPak（2 引线+接片），SC-63 供应商设备封装:TO-252-3 包装:管件 产品目录页面:1286 (CN2011-ZH PDF) 其它名称:*LM317AMDT/NOPBLM317AMDT |
| ADP3335ARMZ-3.3RL7 | 功能描述:IC REG LDO 3.3V .5A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°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:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| ADP3335ARMZ-5-R7 | 功能描述:IC REG LDO 5V .5A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:1 系列:anyCAP® 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 6V 电压 - 压降（标准）:0.23V @ 1.5A 稳压器数量:1 电流 - 输出:1.5A 电流 - 限制（最小）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:TO-261-4，TO-261AA 供应商设备封装:SOT-223-3 包装:Digi-Reel® 其它名称:ADP3339AKCZ-3.3-RLDKR |
| ADP3335ARMZ-5-REEL | 功能描述:IC REG LDO 5V .5A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:75 系列:- 稳压器拓扑结构:正，可调式 输出电压:1.2 V ~ 37 V 输入电压:4.2 V ~ 40 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:500mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-3，DPak（2 引线+接片），SC-63 供应商设备封装:TO-252-3 包装:管件 产品目录页面:1286 (CN2011-ZH PDF) 其它名称:*LM317AMDT/NOPBLM317AMDT |
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