参数资料
| 型号： | ADM6819ARJZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC POWER SEQUENCER SOT23-6 |
| 标准包装： | 1 |
| 系列： | Simple Sequencers® |
| 应用： | 电源序列发生器 |
| 电源电压： | 0.9 V ~ 5.5 V |
| 电流 - 电源： | 350µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 其它名称： | ADM6819ARJZ-REEL7DKR |
ADM6819/ADM6820
THEORY OF OPERATION
The ADM6819/ADM6820 provide local voltage sequencing in
multisupply systems. Figure 18 and Figure 19 show typical
application diagrams for these devices.
SETV PIN
The ADM6819/ADM6820 enable a supply after a monitored
supply voltage exceeds a programmed threshold. This threshold
V IN = 3.3V
V IN = 3.0V
Q1
V OUT = 3.3V
V OUT = 3.0V
is programmed by a R1/R2 resistor divider on the SETV pin.
Once the voltage on SETV exceeds the 0.618 V threshold, the
FET switches on after the delay timer expires. On the
V CC2
ADM6820, this delay is programmable using a capacitor on the
V CC1
GATE
SETD pin. On the ADM6819, this delay is fixed at 300 ms and
the EN pin must be valid high to begin the timer. The required
R1
ADM6819
ON
turn-on voltage is calculated by the following equation:
SETV
GND
EN
OFF
R1 = R2 (( VTRIP / V TH ) – 1)
R2
Figure 18. ADM6819 Applications Diagram
where:
VTRIP is the minimum turn-on voltage at the supply being
monitored.
V IN = 3.3V
V IN = 3.0V
R1
V CC2
GATE
V CC1
ADM6820
Q1
V OUT = 3.3V
V OUT = 3.0V
V TH = 0.618 V.
High value resistors can be used because the SETV input
current is typically 10 nA.
EN PIN
The ADM6819 has an enable (EN) pin connected to the input
of a second comparator, which is identical to that on the VSET
R2
SETV
GND
SETD
C SET
pin. EN can be used as a digital input provided the signal V OL is
below 0.6 V. Alternatively, the enable input can be used to
validate a second supply. The fixed 300 ms timer does not begin
counting until both SETV and EN are above the threshold. As a
Figure 19. ADM6820 Applications Diagram
When the primary supply is above the desired threshold, the
ADM6819/ADM6820 are designed to control the N-channel
FET in the secondary power path to enable the secondary
supply. The GATE pin is held low while both V CC1 and V CC2 are
below the undervoltage threshold, ensuring that the FET is held
off. When V CC1 or V CC2 is above UVLO and the primary supply
is above the desired level dictated by the resistor divider to the
VSET pin, the external FET is driven on after the delay has
expired. An internal charge pump enhances the external FET. A
FET with a low drain-source resistance and low V TH should be
chosen to reduce voltage drop across the drain-source when the
FET is fully enhanced. Either supply may act as the primary
source if V CC1 or V CC2 is greater that 2.95 V. A decoupling
capacitor of typically 100 nF should be used on whichever V CC
is the main supply.
result, the output is not enabled until this timer has expired.
GATE PIN
The internal charge pump is capable of driving the gate of an
N-channel MOSFET with no external capacitors. This ensures
that the MOSFET is enhanced to provide a minimum voltage
drop across the MOSFET, thus reducing the voltage drop across
the FET. This charge pump is designed to drive the high imped-
ance capacitive load of a MOSFET gate input. The GATE pin
should not be resistively loaded because it reduces the gate drive
capability. During undervoltage lockout, GATE is held to GND.
SETD PIN
The ADM6820 features a capacitor adjustable sequencing delay.
A capacitor connected to the SETD pin determines the length
of the sequencing delay. The sequencing delay can be calculated
by the following equation:
t DELAY (s) = 2.652 × 10 6 × CSET
The ADM6819 has a fixed 300 ms delay.
Rev. 0 | Page 10 of 12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM6820 | 制造商:AD 制造商全称:Analog Devices 功能描述:FET Drive Simple Sequencers |
| ADM6820ARJZ-REEL7 | 功能描述:IC POWER SEQUENCER SOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:Simple Sequencers® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM6821 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23 |
| ADM6821LART-RL | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23 |
| ADM6821LART-RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23 |
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