参数资料
| 型号： | ADP172ACBZ-2.9-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/20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
APPLICATIONS INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP172 is designed for operation with small, space-saving
ceramic capacitors but functions with most commonly used
capacitors as long as care is taken with the effective series
resistance (ESR) value. The ESR of the output capacitor affects
the stability of the LDO control loop. A minimum of 1 μF
capacitance with an ESR of 1 ? or less is recommended to
ensure the stability of the ADP172. The 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 ADP172 to large changes in load
current. Figure 24 and Figure 25 show the transient responses
for output capacitance values of 1 μF and 4.7 μF, respectively.
I LOAD
Data Sheet
Input Bypass Capacitor
Connecting a 1 μF capacitor from VIN to GND reduces the
circuit sensitivity to the printed circuit board (PCB) layout,
especially when long input traces or high source impedance
is encountered. If greater than 1 μF of output capacitance is
required, the input capacitor should be increased to match it.
Input and Output Capacitor Properties
Any good quality ceramic capacitor can be used with the ADP172,
as long as it meets the minimum capacitance and maximum ESR
requirements. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior over temper-
ature and applied voltage. Capacitors must have a dielectric
adequate to ensure the minimum capacitance over the necessary
temperature range and dc bias conditions. An X5R or X7R
dielectric with a voltage rating of 6.3 V or 10 V is recommended.
1
2
1mA TO 300mA LOAD STEP,
2.5A/μs
The Y5V and Z5U dielectrics are not recommended due to their
poor temperature and dc bias characteristics.
of a 0402, 1 μF, 10 V X5R capacitor. The variance of a capacitor
is strongly influenced by the capacitor size and voltage rating. In
general, a capacitor in a larger package or with a higher voltage
rating exhibits less capacitance variance over bias voltage. The
V OUT
V OUT = 1.8V
C IN = C OUT = 1μF
temperature variation of the X5R dielectric is about ±15% over
the ?40°C to +85°C temperature range and is not a function of
package or voltage rating.
CH1 200mA ? CH2 50.0mV
B
W
M200ns
A CH1
112mA
1.2
T
500.000ns
Figure 24. Output Transient Response, C OUT = 1 μF
1.0
0.8
I LOAD
1mA TO 300mA LOAD STEP,
1
2.5A/μs
0.6
0.4
0.2
2
V OUT
0
0
2
4
6
8
10
BIAS VOLTAGE (V)
CH1 200mA ? CH2 50.0mV
M200ns
A CH1
108mA
V OUT = 1.8V
C IN = C OUT = 4.7μF
B
W
T 500.000ns
Figure 25. Output Transient Response, C OUT = 4.7 μF
Figure 26. Capacitance vs. Bias Voltage Characteristics
Use Equation 1 to determine the worst-case capacitance,
accounting for capacitor variation over temperature, component
tolerance, and voltage.
C EFF = C BIAS × (1 ? TEMPCO ) × (1 ? TOL )
where:
C BIAS is the effective capacitance at the operating voltage.
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
Rev. D | Page 12 of 20
(1)
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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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