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参数资料
| 型号： | ADP1821ARQZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 720kHz |
| 占空比： | 90% |
| 电源电压： | 3.7 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 其它名称： | ADP1821ARQZ-R7DKR |
ADP1821
COMPENSATION
The control loop is compensated by an external series RC
network from COMP to FB and sometimes requires a series
RC in parallel with the top voltage divider resistor. COMP is
the output of the internal error amplifier.
The internal error amplifier compares the voltage at FB to the
internal 0.6 V reference voltage. The difference between the two
(the feedback voltage error) is amplified by the error amplifier.
To optimize the ADP1821 for stability and transient response
for a given set of external components and input/output voltage
conditions, choose the compensation components carefully. For
more information on choosing the compensation components,
see the Compensating the Voltage Mode Buck Regulator section.
POWER-GOOD INDICATOR
The ADP1821 features an open-drain, power-good output
THERMAL SHUTDOWN
The ADP1821 controller does not generate much heat under
normal conditions, even when driving a relatively large MOSFET.
However, the surrounding power components or other circuits
on the same PCB could heat up the PCB to an unsafe operating
temperature. The ADP1821 controller goes into shutdown and
shuts off the gate drivers when its junction temperature reaches
about 145°C. When the junction temperature drops below
about 135°C, the ADP1821 resumes normal operation in a soft
start mode.
SHUTDOWN CONTROL
The ADP1821 dc-to-dc converter features a low power shut-
down mode that reduces quiescent supply current to 1 μA. To
shut down the ADP1821, drive SHDN low. T o turn it on, drive
SHDN high. For automatic startup, connect SHDN to VCC.
(PWGD) that sinks current when the output voltage drops 8.3%
below or 25% above the nominal regulation voltage. Two com-
parators measure the voltage at FB to set these thresholds. The
PWGD comparator directly monitors FB, and the threshold is
fixed at 0.55 V for undervoltage and 0.75 V for overvoltage. The
PWGD output also sinks current if an overtemperature or input
undervoltage condition is detected and is operational with VCC
voltage as low as 1 V.
Use this output as a logical power-good signal by connecting a
pull-up resistor from PWGD to an appropriate supply voltage.
Rev. C | Page 11 of 24
相关PDF资料 |
PDF描述 |
|---|---|
| ADP1822ARQZ-R7 | IC REG CTRLR BUCK PWM VM 24-QSOP |
| ADP1823ACPZ-R7 | IC REG CTRLR BUCK PWM VM 32LFCSP |
| ADP1828ACPZ-R7 | IC REG CTRLR BUCK PWM VM 20LFCSP |
| ADP1829ACPZ-R7 | IC REG CTRLR BUCK PWM VM 32LFCSP |
| ADP1850ACPZ-R7 | IC REG CTRLR BUCK PWM CM 32LFCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1821-BL1-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For Step-Down DC-To-DC Controller 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1821 - Boxed Product (Development Kits) |
| ADP1821-BL2-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For Step-Down DC-To-DC Controller 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1821 - Boxed Product (Development Kits) |
| ADP1821-EVAL | 功能描述:电源管理IC开发工具 Evaluation Board I.C. RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| ADP1822 | 制造商:AD 制造商全称:Analog Devices 功能描述:PWM, Step-Down DC-to-DC Controller with Margining and Tracking |
| ADP1822ARQZ-R7 | 功能描述:IC REG CTRLR BUCK PWM VM 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:0°C ~ 70°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
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