- 您现在的位置：买卖IC网 > PDF目录98000 > LM25066APSQE (NATIONAL SEMICONDUCTOR CORP) POWER SUPPLY SUPPORT CKT, QCC24 PDF资料下载
参数资料
| 型号： | LM25066APSQE |
| 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： | 1658K |
| 代理商： | LM25066APSQE |
第1页第2页第3页第4页当前第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
30146011
FIGURE 1. Typical Application Circuit
Power Up Sequence
The VIN operating range of the LM25066A 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
VIN voltage reaches the POR threshold, the insertion time
begins. 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 in-
sertion time ends when the TIMER pin voltage reaches 1.7V.
C
T is then quickly discharged by an internal 1.9 mA pull-down
current. The GATE pin then switches on Q
1 when the input
voltage, V
SYS, exceeds the UVLO threshold. If VSYS 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 LM25066A 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
the voltage at 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 LM25066A will pull the SMBA pin low after the input volt-
age 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_SPE-
CIFIC register (80h) indicates default configuration of warning
thresholds and device operation and will remain set until a
CLEAR_FAULTS command is received.
13
www.national.com
LM25066A
相关PDF资料 |
PDF描述 |
|---|---|
| LM2575T-012G | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, SFM5 |
| LM2577K-12/883 | 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, MBFM2 |
| LM2577KADJ/883 | 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, MBCY4 |
| LM2577K-15/883 | 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, MBFM2 |
| LM2633MTDX/NOPB | SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM25066APSQE/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 |
| LM25066APSQX | 制造商:TI 制造商全称:Texas Instruments 功能描述:System Power Management and Protection IC with PMBusa?￠ |
| LM25066APSQX/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 |
| LM25066EVK/NOPB | 功能描述:电源管理IC开发工具 LM25066 EVAL BOARD 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 |
| LM25066IAPSQ/NOPB | 制造商:Texas Instruments 功能描述:IC PWR MGMT/PROT PMBUS 24WQFN 制造商:Texas Instruments 功能描述:System PWR Mgmt & Protection IC |
发布紧急采购，3分钟左右您将得到回复。