参数资料
| 型号： | ADP1720ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 50MA 8-MSOP |
| 产品培训模块： | Power Line Monitoring |
| 设计资源： | Using AD7150 for Proximity Sensing Appls (CN0095) 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.225 V ~ 5 V |
| 输入电压： | 4 V ~ 28 V |
| 电压 - 压降（标准）： | 0.275V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA（最小值） |
| 电流 - 限制（最小）： | 55mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 794 (CN2011-ZH PDF) |
| 配用： | ADP1720-5-EVALZ-ND - BOARD EVAL FOR ADP1720-5 ADP1720-EVALZ-ND - BOARD EVAL FOR ADP1720-ADJ ADP1720-3.3-EVALZ-ND - BOARD EVAL FOR ADP1720-3.3 |
| 其它名称： | ADP1720ARMZ-R7DKR |
ADP1720
APPLICATIONS INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP1720 is designed for operation with small, space-saving
ceramic capacitors, but it functionswith most commonly used
capacitors as long as care is taken about the effective series
resistance (ESR) value. The ESR of the output capacitor affects
stability of the LDO control loop. A minimum of 1 μF capacitance
with an ESR of 500 mΩ or less is recommended to ensure sta-
bility of the ADP1720. Transient response to changes in load
current is also affected by output capacitance. Using a larger
value of output capacitance improves the transient response of
the ADP1720 to large changes in load current. Figure 20 and
values of 1 μF and 10 μF, respectively.
V IN = 12V
V OUT = 1.6V
C IN = 1μF
C OUT = 1μF
LOAD STEP FROM 2.5mA TO 47.5mA
1
TIME (2μs/DIV)
Figure 20. Output Transient Response, 1 μF
V IN = 12V
V OUT = 1.6V
C IN = 10μF
C OUT = 10μF
LOAD STEP FROM 2.5mA TO 47.5mA
1
TIME (2μs/DIV)
Figure 21. Output Transient Response, 10 μF
Input Bypass Capacitor
Connecting a 1 μF capacitor from IN to GND reduces the cir-
cuit sensitivity to printed circuit board (PCB) layout, especially
Input and Output Capacitor Properties
Any good quality ceramic capacitors can be used with the
ADP1720, as long as they meet the minimum capacitance and
maximum ESR requirements. Ceramic capacitors are manufac-
tured with a variety of dielectrics, each with different behavior
over temperature and applied voltage. Capacitors must have a
dielectric adequate to ensure the minimum capacitance over
the necessary temperature range and dc bias conditions. X5R
or X7R dielectrics with a voltage rating of 6.3 V or 10 V are
recommended for the output capacitor. X5R or X7R dielectrics
with a voltage rating of 50 V or higher are recommended for the
input capacitor.
Y5V and Z5U dielectrics are not recommended, due to their
poor temperature and dc bias characteristics.
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
Current limit and thermal overload protection circuits on the
ADP1720 protect the part from damage caused by excessive power
dissipation. The ADP1720 is designed to current limit when
the output load reaches 90 mA (typical). When the output
load exceeds 90 mA, the output voltage is reduced to maintain
a 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 dissipa-
tion), 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 output current is restored to its nominal value.
Consider the case where a hard short from OUT to GND occurs.
At first, the ADP1720 current limits so that only 90 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 zero. As the junction
temperature cools and drops below 135°C, the output turns on
and conducts 90 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
90 mA and 0 mA, which 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 that junction temperatures do not exceed 125°C.
when encountering long input traces or high source impedance.
If greater than 1 μF of output capacitance is required, it is
recommended that the input capacitor be increased to match it.
Rev. A | Page 11 of 16
相关PDF资料 |
PDF描述 |
|---|---|
| ADP1720TRMZ-EP | IC REG LDO ADJ 50MA 8-MSOP |
| ADP172ACBZ-2.9-R7 | IC REG LDO 2.9V .3A 4WLCSP |
| ADP1740ACPZ-1.1-R7 | IC REG LDO 1.1V 2A 16LFCSP |
| ADP1752ACPZ-1.8-R7 | IC REG LDO 1.8V .8A 16LFCSP |
| ADP1754ACPZ-1.2-R7 | IC REG LDO 1.2V 1.2A 16LFCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1720ARMZ-R7 | 制造商:Analog Devices 功能描述:IC ADJ LDO REG 1.225V TO 5V 50mA MSOP-8 |
| ADP1720-BL1-EVZ | 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1720 - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:Evaluation Board, CMOS Linear Regulator |
| ADP1720-EP | 制造商:AD 制造商全称:Analog Devices 功能描述:50 mA, High Voltage, Micropower Linear Regulator |
| ADP1720-EVALZ | 功能描述:BOARD EVAL FOR ADP1720-ADJ RoHS:是 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:- 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ADP1720TRMZ3.3-EP | 功能描述:IC REG LDO 3.3V 50MA 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
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