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参数资料
| 型号： | ADP1822ARQZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 720kHz |
| 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 ~ 125°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 配用： | ADP1822-EVAL-ND - BOARD EVALUATION FOR ADP1822 |
| 其它名称： | ADP1822ARQZ-R7DKR |
Data Sheet
If the output voltage is precharged prior to turn-on, the
ADP1822 prevents reverse inductor current that would discharge
the output voltage. Once the voltage at SS exceeds the 0.6 V
regulation voltage, the reverse current is re-enabled to allow the
output voltage regulation to be independent of load current.
To override the soft start feature, leave SS unconnected. This
allows the output voltage to rise as quickly as possible and
eliminates the soft start period.
HIGH-SIDE DRIVER (BST AND DH)
Gate drive for the high-side power MOSFET is generated by a
flying capacitor boost circuit. This circuit allows the high-side
N-channel MOSFET gate to be driven above the input voltage,
allowing full enhancement of and a low voltage drop across the
MOSFET. The circuit is powered from a flying capacitor from
SW to BST that in turn is powered from the PVCC gate driver
voltage. When the low-side switch is turned on, SW is driven to
PGND, and the flying capacitor is charged from PVCC through
an external Schottky rectifier. The capacitor stores sufficient
charge to power BST to drive DH high and to fully enhance the
high-side N-channel MOSFET. Use a flying capacitor value
greater than 100× the high-side MOSFET input capacitance.
LOW-SIDE DRIVER (DL)
DL is the gate drive for the low-side power MOSFET synchronous
rectifier. Synchronous rectification reduces conduction losses
developed by a conventional rectifier by replacing it with a
low resistance MOSFET switch. DL turns on the synchronous
rectifier by driving the gate voltage to PVCC. The MOSFET is
turned off by driving the gate voltage to PGND.
An active dead time reduction circuit reduces the break-before-
make time of the switching to limit the losses due to current
flowing through the synchronous rectifier body diode or
external Schottky rectifier.
INPUT VOLTAGE RANGE
The ADP1822 takes its internal power from the VCC and
PVCC inputs. PVCC powers the low-side MOSFET gate drive
(DL), and VCC powers the internal control circuitry. Both of
these inputs are limited to between 3.7 V and 5.5 V. Bypass
PVCC to PGND with a 1 μF or greater capacitor. Bypass VCC
to GND with a 0.1 μF or greater capacitor.
The power input to the dc-to-dc converter can range between
1.2× the output voltage up to 24 V. Bypass the power input to
SETTING THE OUTPUT VOLTAGE
The output voltage is set using a resistive voltage divider from
the output to FB. The voltage divider drops the output voltage
ADP1822
to the 0.6 V FB regulation voltage to set the regulation output
voltage. The output voltage is set to voltages as low as 0.6 V and
as high as 85% of the minimum power input voltage (see the
SWITCHING FREQUENCY CONTROL
The ADP1822 has a logic-controlled frequency select input, FREQ,
which sets the switching frequency to 300 kHz or 600 kHz.
Drive FREQ low for 300 kHz and drive it high for 600 kHz.
The SYNC input is used to synchronize the converter switching
frequency to an external signal. The synchronization range is
300 kHz to 1.2 MHz. The acceptable synchronization frequency
range is limited to twice the nominal switching frequency set by
FREQ. For lower frequency synchronization, between 300 kHz
and 600 kHz, connect FREQ to GND. For higher frequency
synchronization, between 480 kHz and 1.2 MHz, connect FREQ
to VCC (see the Synchronizing the Converter section for more
information).
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 ADP1822 for stability and transient response
for a given set of external components and input/output voltage
conditions, choose the compensation components. For more
information on choosing the compensation components, see
the Compensating the Regulator section.
POWER-GOOD INDICATOR
The ADP1822 features an open-drain power-good output,
PWGD, that sinks current when the output voltage drops
8.3% below or 25% above the nominal regulation voltage. Two
comparators measure the voltage at FB to set these thresholds.
The PWGD output also sinks current if overtemperature or
input undervoltage conditions are detected. It is operational
with V CC voltage as low as 1.0 V.
Use this output as a simple power-good signal by connecting a
pull-up resistor from PWGD to an appropriate supply voltage.
SHUTDOWN CONTROL
The ADP1822 dc-to-dc converter features a low power shut-
down mode that reduces quiescent supply current to 1 μA. To
shut down the ADP1822, drive SHDN low. T o turn it on, drive
SHDN high. For automatic startup, connect SHDN to VCC.
Rev. D | Page 13 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1822-BL1-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-BL2-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-EVAL | 功能描述:BOARD EVALUATION FOR ADP1822 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1823 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking |
| ADP1823ACPZ | 制造商:Analog Devices 功能描述:IC CONTROLLER STEP DOWN DUAL SMD |
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