- 您现在的位置：买卖IC网 > PDF目录17413 > ADP2108UJZ-REDYKIT (Analog Devices Inc)KIT REDY TOOL 1.2/3.3 ADP2108 PDF资料下载
参数资料
| 型号： | ADP2108UJZ-REDYKIT |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | KIT REDY TOOL 1.2/3.3 ADP2108 |
| 标准包装： | 1 |
| 系列： | Redykit™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.2V，3.3V |
| 电流 - 输出： | 600mA |
| 输入电压： | 2.3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 2 板，样品 |
| 已用 IC / 零件： | ADP2108 |
ADP2108
SHORT-CIRCUIT PROTECTION
The ADP2108 includes frequency foldback to prevent output
current runaway on a hard short. When the voltage at the
feedback pin falls below half the target output voltage, indicat-
ing the possibility of a hard short at the output, the switching
frequency is reduced to half the internal oscillator frequency.
The reduction in the switching frequency allows more time for
the inductor to discharge, preventing a runaway of output current.
UNDERVOLTAGE LOCKOUT
To protect against battery discharge, undervoltage lockout
(UVLO) circuitry is integrated on the ADP2108. If the input
voltage drops below the 2.15 V UVLO threshold, the ADP2108
shuts down, and both the power switch and the synchronous
rectifier turn off. When the voltage rises above the UVLO thresh-
old, the soft start period is initiated, and the part is enabled.
THERMAL PROTECTION
In the event that the ADP2108 junction temperature rises above
150°C, the thermal shutdown circuit turns off the converter.
Extreme junction temperatures can be the result of high current
operation, poor circuit board design, or high ambient temperature.
A 20°C hysteresis is included so that when thermal shutdown
occurs, the ADP2108 does not return to operation until the
on-chip temperature drops below 130°C. When coming out
of thermal shutdown, soft start is initiated.
SOFT START
Data Sheet
After the EN pin is driven high, internal circuits start to power up.
The time required to settle after the EN pin is driven high is called
the power-up time. After the internal circuits are powered up, the
soft start ramp is initiated and the output capacitor is charged
linearly until the output voltage is in regulation. The time required
for the output voltage to ramp is called the soft start time.
Start-up time in the ADP2108 is the measure of when the
output is in regulation after the EN pin is driven high. Start-up
time consists of the power-up time and the soft start time.
CURRENT LIMIT
The ADP2108 has protection circuitry to limit the amount of
positive current flowing through the PFET switch and the
synchronous rectifier. The positive current limit on the power
switch limits the amount of current that can flow from the input
to the output. The negative current limit prevents the inductor
current from reversing direction and flowing out of the load.
100% DUTY OPERATION
With a drop in V IN or with an increase in I LOAD , the ADP2108
reaches a limit where, even with the PFET switch on 100% of
the time, V OUT drops below the desired output voltage. At this
limit, the ADP2108 smoothly transitions to a mode where the
PFET switch stays on 100% of the time. When the input conditions
change again and the required duty cycle falls, the ADP2108
immediately restarts PWM regulation without allowing over-
shoot on V OUT .
The ADP2108 has an internal soft start function that ramps the
output voltage in a controlled manner upon startup, thereby
limiting the inrush current. This prevents possible input voltage
drops when a battery or a high impedance power source is
connected to the input of the converter.
Rev. G | Page 12 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| A9CCA-0306F | FLEX CABLE - AFG03A/AF03/AFG03A |
| RNM-1215S | CONV DC/DC 1W 12VIN 15VOUT |
| MIC5842YV | IC DRVR LATCH 8BIT SER IN 20PLCC |
| A9BBA-0408F | FLEX CABLE - AFF04A/AF04/AFF04A |
| RNM-1209S | CONV DC/DC 1W 12VIN 09VOUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2109 | 制造商:AD 制造商全称:Analog Devices 功能描述:Compact 600 mA, 3 MHz, Step-Down Converter with Output Discharge |
| ADP2109ACBZ-1.0-R7 | 功能描述:IC REG BUCK SYNC 1V 0.6A 5WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| ADP2109ACBZ-1.2-R7 | 功能描述:IC REG BUCK SYNC 1.2V .6A 5WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| ADP2109ACBZ-1.5-R7 | 功能描述:IC REG BUCK SYNC 1.5V .6A 5WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| ADP2109ACBZ-1.8-R7 | 功能描述:IC REG BUCK SYNC 1.8V .6A 5WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
发布紧急采购，3分钟左右您将得到回复。