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| 型号： | ADP1708-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP1708 |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 1.6V |
| 电流 - 输出： | 1A |
| 输入电压： | 2.5 ~ 5.5V |
| 稳压器类型： | 正，可调式 |
| 工作温度： | -40°C ~ 125°C |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1708 |
| 产品目录页面： | 793 (CN2011-ZH PDF) |
| 相关产品： | ADP1708ARDZ-R7DKR-ND - IC REG LDO ADJ 1A 8SOIC ADP1708ARDZ-R7CT-ND - IC REG LDO ADJ 1A 8SOIC ADP1708ARDZ-R7TR-ND - IC REG LDO ADJ 1A 8SOIC ADP1708ACPZ-R7TR-ND - IC REG LDO ADJ 1A 8-LFCSP |
ADP1706/ADP1707/ADP1708
APPLICATION INFORMATION
CAPACITOR SELECTION
Output Capacitor
The ADP1706/ADP1707/ADP1708 are designed for operation
with small, space-saving ceramic capacitors, but they function
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 stability of the LDO control loop. A minimum of
4.7 μF capacitance with an ESR of 500 mΩ or less is recommended
to ensure stability of the ADP1706/ADP1707/ADP1708. 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 ADP1706/ADP1707/ADP1708 to
large changes in load current. Figure 33 and Figure 34 show the
transient responses for output capacitance values of 4.7 μF and
22 μF, respectively.
V OUT RESPONSE TO LOAD STEP
FROM 50mA TO 950mA
Input Bypass Capacitor
Connecting a 4.7 μF capacitor from the IN pin 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 4.7 μF of output capacitance is
required, it is recommended that the input capacitor be increased
to match it.
Input and Output Capacitor Properties
Any good quality ceramic capacitors can be used with the
ADP1706/ADP1707/ADP1708, as long as they meet the
minimum capacitance and maximum ESR requirements.
Ceramic capacitors are manufactured with a variety of dielec-
trics, 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. Y5V and Z5U
dielectrics are not recommended, due to their poor temperature
and dc bias characteristics.
VOLTAGE TRACKING APPLICATIONS
RATIO VOLTAGE TRACKING
ADP1706-2.5
OUT
TIME (2 μ s/DIV)
V IN = 3.8V
V OUT = 1.6V
C IN = 4.7 μ F
C OUT = 4.7 μ F
5V
IN
EN
SS
GND
R1
R2
2.5V
2.5V
V OUT
1.2V
ADP1707-1.2
1.2V
OUT
I/O POWER RAIL
RATIO
TRACKING
CORE RAIL
Figure 33. Output Transient Response, C OUT = 4.7 μF
TRK
IN
TIME
EN
GND
Figure 35. Voltage Tracking Feature Using ADP1707
feature is used. An ADP1706 powers the I/O of a microproces-
V OUT RESPONSE TO LOAD STEP
FROM 50mA TO 950mA
V IN = 3.8V
V OUT = 1.6V
C IN = 22 μ F
C OUT = 22 μ F
TIME (2 μ s/DIV)
Figure 34. Output Transient Response, C OUT = 22 μF
sor and an ADP1707 powers the core. At startup, the output of
the ADP1706 ramps to 2.5 V, which is divided down via a
voltage divider (R1 and R2) to a lower voltage at the TRK pin of
the ADP1707. The output of the ADP1707 thus follows the
TRK pin and ramps up steadily to 1.2 V. This implementation
ensures that the core of the processor powers up after the I/O.
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
The ADP1706/ADP1707/ADP1708 are protected against
damage due to excessive power dissipation by current and
thermal overload protection circuits. The ADP1706/ADP1707/
ADP1708 are designed to reach current limit when the output
load reaches 1.5 A (typical). When the output load exceeds
1.5 A, the output voltage is reduced to maintain a constant
current limit.
Rev. 0 | Page 12 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1708-EVALZ | 制造商:Analog Devices 功能描述:ADP1708, LDO, CMOS, EVALUATION BOARD |
| ADP170AUJZ-1.25-R7 | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 1.25V 300mA TSOT-5 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 稳压器拓扑:正，固定式 电压 - 输出:1.25V 电流 - 输出:300mA 电压 - 跌落（典型值）:- 稳压器数:1 电压 - 输入:1.6 V ~ 3.6 V 电流 - 限制（最小值）:400mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商器件封装:TSOT-5 标准包装:3,000 |
| ADP170AUJZ-1.2-R7 | 功能描述:IC REG LDO 1.2V .3A TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.12V @ 150mA 稳压器数量:1 电流 - 输出:150mA（最小值） 电流 - 限制（最小）:220mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) 其它名称:ADP160AUJZ-3.0-R7TR |
| ADP170AUJZ-1.5-R7 | 功能描述:IC REG LDO 1.5V .3A TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.12V @ 150mA 稳压器数量:1 电流 - 输出:150mA（最小值） 电流 - 限制（最小）:220mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) 其它名称:ADP160AUJZ-3.0-R7TR |
| ADP170AUJZ-1.8-R7 | 功能描述:IC REG LDO 1.8V .3A TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
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