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参数资料
| 型号： | LTC4252A-2CMS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 4/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-2CMS#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
12
425212fb
4252-1/2 F01
LTC4252
CLOAD
ISOLATED
DC/DC
CONVERTER
MODULE
LOW
VOLTAGE
CIRCUITRY
++
––
PLUG-IN BOARD
BACKPLANE
–48RTN
–48V
LONG
+
4252-1/2 F02
–48RTN
–48V
UV
OV
TIMER
VEE
VIN
SENSE
GATE
SS
DRAIN
LTC4252A-1
R1
390k
1%
R2
30.1k
1%
RD
1M
CT
0.68
F
CSS
68nF
CC
10nF
RS
0.02
Q1
IRF530S
RC
10
RIN
3
× 1.8k IN SERIES
1/4W EACH
C1
10nF
CIN
1
F
CLOAD
100
F
LONG
SHORT
+
Hot Circuit Insertion
When circuit boards are inserted into a live backplane, the
supply bypass capacitors can draw huge transient cur-
rents from the power bus as they charge. The flow of
current damages the connector pins and glitches the
power bus, causing other boards in the system to reset.
The LTC4252 is designed to turn on a circuit board supply
in a controlled manner, allowing insertion or removal
without glitches or connector damage.
Initial Start-Up
The LTC4252 resides on a removable circuit board and
controls the path between the connector and load or
power conversion circuitry with an external MOSFET switch
(see Figure 1). Both inrush control and short-circuit pro-
tection are provided by the MOSFET.
A detailed schematic for the LTC4252A is shown in Fig-
ure 2. – 48V and – 48RTN receive power through the
longest connector pins and are the first to connect when
the board is inserted. The GATE pin holds the MOSFET off
during this time. UV and OV determine whether or not the
MOSFET should be turned on based upon internal high
accuracy thresholds and an external divider. UV and OV do
double duty by also monitoring whether or not the connec-
tor is seated. The top of the divider detects – 48RTN by way
of a short connector pin that is the last to mate during the
insertion sequence.
OPERATIO
U
Figure 1. Basic LTC4252 Hot Swap Topology
Figure 2. –48V, 2.5A Hot Swap Controller
Interlock Conditions
A start-up sequence commences once these “interlock”
conditions are met.
1. The input voltage VIN exceeds VLKO (UVLO).
2. The voltage at UV > VUVHI.
3. The voltage at OV < VOVLO.
4. The (SENSE – VEE) voltage is < 50mV (VCB).
5. The voltage at SS is < 0.2V (20 VOS).
6. The voltage on the TIMER capacitor (CT) is < 1V (VTMRL).
7. The voltage at GATE is < 0.5V (VGATEL).
The first three conditions are continuously monitored and
the latter four are checked prior to initial timing or GATE
ramp-up. Upon exiting an OV condition, the TIMER pin
voltage requirement is inhibited. Details are described in
the Applications Information, Timing Waveforms section.
TIMER begins the start-up sequence by sourcing 5.8
A
into CT. If VIN, UV or OV falls out of range, the start-up cycle
stops and TIMER discharges CT to less than 1V, then waits
until the aforementioned conditions are once again met. If
CT successfully charges to 4V, TIMER pulls low and both
SS and GATE pins are released. GATE sources 58
A
(IGATE), charging the MOSFET gate and associated capaci-
tance. The SS voltage ramp limits VSENSE to control the
inrush current. PWRGD pulls active low when GATE is
within 2.8V of VIN and DRAIN is lower than VDRNL.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-2IMS | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMS#PBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMS#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMS#TRPBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
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