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参数资料
| 型号： | LM25066PSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC24 |
| 封装： | LLP-24 |
| 文件页数： | 5/48页 |
| 文件大小： | 1456K |
| 代理商： | LM25066PSQX |
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30115811
FIGURE 1. Typical Application Circuit
Power Up Sequence
The VIN operating range of the LM25066 is +2.9V to +17V,
with transient capability to +24V. Referring to Figure 1 and
Figure 2, as the voltage at VIN initially increases, the external
N-channel MOSFET (Q
1) is held off by an internal 190 mA
pull-down current at the GATE pin. The strong pull-down cur-
rent at the GATE pin prevents an inadvertent turn-on as the
MOSFET’s gate-to-drain (Miller) capacitance is charged. Ad-
ditionally, the TIMER pin is initially held at ground. When the
V
IN voltage reaches the POR threshold, the insertion time be-
gins. During the insertion time, the capacitor at the TIMER pin
(C
T) is charged by a 5.5 A current source and Q1 is held off
by a 2 mA pull-down current at the GATE pin regardless of
the input voltage. The insertion time delay allows ringing and
transients at VIN to settle before Q
1 is enabled. The insertion
time ends when the TIMER pin voltage reaches 1.7V. C
T is
then quickly discharged by an internal 1.9 mA pull-down cur-
rent. The GATE pin then switches on Q
1 when VSYS, the input
supply voltage, exceeds the UVLO threshold. If V
SYS is above
the UVLO threshold at the end of the insertion time, Q
1 switch-
es on at that time. The GATE pin charge pump sources 22 A
to charge the gate capacitance of Q
1. The maximum voltage
at the GATE pin with respect to ground is limited by an internal
18.8V zener diode.
As the voltage at the OUT pin increases, the LM25066 mon-
itors the drain current and power dissipation of MOSFET Q
1.
Inrush current limiting and/or power limiting circuits actively
control the current delivered to the load. During the inrush
limiting interval (t
2 in Figure 2), an internal 90 A fault timer
current source charges C
T. If Q1’s power dissipation and the
input current reduce below their respective limiting thresholds
before the TIMER pin reaches 1.7V, the 90 A current source
is switched off and C
T is discharged by the internal 2.8 A
current sink (t
3 in Figure 2). The PGD pin switches high when
FB exceeds its rising threshold of 1.167V.
If the TIMER pin voltage reaches 1.7V before inrush current
limiting or power limiting ceases during t
2, a fault is declared
and Q
1 is turned off. See the Fault Timer & Restart section for
a complete description of the fault mode.
The LM25066 will pull the SMBA pin low after the input voltage
has exceeded its POR threshold to indicate that the volatile
memory and device settings are in their default state. The
CONFIG_PRESET bit within the STATUS_MFR_SPECIFIC
register (80h) indicates default configuration of warning
thresholds and device operation and will remain set until a
CLEAR_FAULTS command is received.
13
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LM25066
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM25066PSQX/NOPB | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| LM25069 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Positive Low Voltage Power Limiting Hot Swap Controller |
| LM25069MM-2EVAL | 功能描述:BOARD EVALUATION LM25069 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| LM25069MM-2EVAL/NOPB | 功能描述:电源管理IC开发工具 LM25069MM-2 Eval Brd 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 |
| LM25069PMM-1 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Positive Low Voltage Power Limiting Hot Swap Controller |
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