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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： | 17/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-2CMS#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
24
425212fb
APPLICATIO S I FOR ATIO
WU
U
Undervoltage Timing
In Figure 11 when UV pin drops below VUVLO(time point 1),
the LTC4252 shuts down with TIMER, SS and GATE all
pulling low. If current has been flowing, the SENSE pin
voltage decreases to zero as GATE collapses. When UV
recovers and clears VUVHI (time point 2), an initial timer
cycle begins followed by a GATE start-up cycle.
VIN Undervoltage Lockout Timing
The VIN undervoltage lockout comparator, UVLO, has a
similar timing behavior as the UV pin timing except it looks
for VIN < (VLKO – VLKH) to shut down and VIN > VLKO to
start. In an undervoltage lockout condition, both UV and
OV comparators are held off. When VIN exits undervoltage
lockout, the UV and OV comparators are enabled.
Undervoltage Timing with Overvoltage Glitch
In Figure 12, both UV and OV pins are connected together.
When UV clears VUVHI (time point 1), an initial timing cycle
starts. If the system bus voltage overshoots VOVHI as
shown at time point 2, TIMER discharges. At time point 3,
the supply voltage recovers and drops below the VOVLO
threshold. The initial timing cycle restarts, followed by a
GATE start-up cycle.
Overvoltage Timing
During normal operation, if the OV pin exceeds VOVHI as
shown at time point 1 of Figure 13, the TIMER and PWRGD
status are unaffected. Nevertheless, SS and GATE pull
down and the load is disconnected. At time point 2, OV
recovers and drops below the VOVLO threshold. A GATE
start-up cycle begins. If the overvoltage glitch is long
enough to deplete the load capacitor, a full start-up cycle
as shown between time points 4 through 7 may occur.
Circuit Breaker Timing
In Figure 14a, the TIMER capacitor charges at 230
A if the
SENSE pin exceeds VCB but VDRN is less than 5V. If the
SENSE pin drops below VCB before TIMER reaches the
Figure 11. Undervoltage Timing (All Waveforms are Referenced to VEE)
UV
TIMER
GATE
SENSE
SS
DRAIN
PWRGD
5.8
A
58
A
5.8
A
5.8
A
58
A
UV DROPS BELOW VUVLO. GATE, SS AND TIMER ARE PULLED DOWN, PWRGD RELEASES
12
3 4 56
7
8 9
TIMER CLEARS VTMRL, CHECK GATE < VGATEL, SENSE < VCB AND SS < 20 VOS
10 11
4252-1/2 F11
UV CLEARS VUVHI, CHECK OV CONDITION, GATE < VGATEL, SENSE < VCB, SS < 20 VOS AND TIMER < VTMRL
VACL
VCB
230
A + 8 IDRN
20 VOS
VIN – VGATEH
VDRNL
VDRNCL
20 (VCB + VOS)
20 (VACL + VOS)
VGATEL
VTMRL
VTMRH
VUVHI
VUVLO
GATE
START-UP
INITIAL TIMING
相关PDF资料 |
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| LTC4252A-2IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-2IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252-2CMS8#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
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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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