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参数资料
| 型号： | LTC4252A-1CMS#PBF |
| 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： | 2/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-1CMS#PBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
10
425212fb
VEE (Pin 5/Pin 4): Negative Supply Voltage Input. Connect
this pin to the negative side of the power supply.
GATE (Pin 6/Pin 5): N-Channel MOSFET Gate Drive Out-
put. This pin is pulled high by a 58
A current source. GATE
is pulled low by invalid conditions at VIN (UVLO), UV, OV,
or a circuit breaker fault timeout. GATE is actively servoed
to control the fault current as measured at SENSE. A
compensation capacitor at GATE stabilizes this loop. A
comparator monitors GATE to ensure that it is low before
allowing an initial timing cycle, GATE ramp-up after an
overvoltage event or restart after a current limit fault.
During GATE start-up, a second comparator detects if
GATE is within 2.8V of VIN before PWRGD is set (MS
package only).
DRAIN (Pin 7/Pin 6): Drain Sense Input. Connecting an
external resistor, RD, between this pin and the MOSFET’s
drain (VOUT) allows voltage sensing below 6.15V (5V for
LTC4252A) and current feedback to TIMER. A comparator
detects if DRAIN is below 2.385V and together with the
GATE high comparator sets the PWRGD flag. If VOUT is
above VDRNCL, DRAIN clamps at approximately VDRNCL.
The current through RD is internally multiplied by 8 and
added to TIMER’s 230
A pullup current during a circuit
breaker fault cycle. This reduces the fault time and MOSFET
heating.
OV (Pin 8/Pin7): Overvoltage Input. The active high thresh-
old at the OV pin is set at 6.15V with 0.6V hysteresis. If OV
> 6.15V, GATE pulls low. When OV returns below 5.55V,
GATE start-up begins without an initial timing cycle. The
LTC4252A OV pin is set at 5.09V with 102mV hysteresis.
If OV > 5.09V, GATE pulls low. When OV returns below
4.988V, GATE start-up begins without an initial timing
cycle. If an overvoltage condition occurs in the middle of
an initial timing cycle, the initial timing cycle is restarted
after the overvoltage condition goes away. An overvoltage
condition does not reset the PWRGD flag. The internal
UVLO at VIN always overrides OV. A 1nF to 10nF capacitor
at OV prevents transients and switching noise from affect-
ing the OV thresholds and prevents glitches at the GATE
pin.
UV (Pin 9/Pin 7): Undervoltage Input. The active low
threshold at the UV pin is set at 2.925V with 0.3V hyster-
esis. If UV < 2.925V, PWRGD pulls high, both GATE and
TIMER pull low. If UV rises above 3.225V, this initiates an
initial timing cycle followed by GATE start-up. The
LTC4252A UV pin is set at 3.08V with 324mV hysteresis.
If UV < 2.756V, PWRGD pulls high, both GATE and TIMER
pull low. If UV rises above 3.08V, this initiates an initial
timing cycle followed by GATE start-up. The internal UVLO
at VIN always overrides UV. A low at UV resets an internal
fault latch. A 1nF to 10nF capacitor at UV prevents tran-
sients and switching noise from affecting the UV thresh-
olds and prevents glitches at the GATE pin.
TIMER (Pin 10/Pin 8): Timer Input. TIMER is used to
generate an initial timing delay at start-up and to delay
shutdown in the event of an output overload (circuit
breaker fault). TIMER starts an initial timing cycle when
the following conditions are met: UV is high, OV is low, VIN
clears UVLO, TIMER pin is low, GATE is lower than VGATEL,
SS < 0.2V, and VSENSE – VEE < VCB. A pull-up current of
5.8
A then charges CT, generating a time delay. If CT
charges to VTMRH (4V), the timing cycle terminates, TIMER
quickly pulls low and GATE is activated.
If SENSE exceeds 50mV while GATE is high, a circuit
breaker cycle begins with a 230
A pull-up current charg-
ing CT. If DRAIN is approximately 7V (6V for LTC4252A)
during this cycle, the timer pull-up has an additional
current of 8 IDRN. If SENSE drops below 50mV before
TIMER reaches 4V, a 5.8
A pull-down current slowly
discharges the CT. In the event that CT eventually inte-
grates up to the VTMRH threshold, the circuit breaker trips,
GATE quickly pulls low and PWRGD pulls high. The
LTC4252-1 TIMER pin latches high with a 5.8
A pull-up
source. This latched fault is cleared by either pulling
TIMER low with an external device or by pulling UV below
VUVLO. The LTC4252-2 starts a shutdown cooling cycle
following an overcurrent fault. This cycle consists of 4
discharging ramps and 3 charging ramps. The charging
and discharging currents are 5.8
A and TIMER ramps
between its 1V and 4V thresholds. At the completion of a
shutdown cooling cycle, the LTC4252-2 attempts a start-
up cycle.
PI FU CTIO S
UU
U
(MS/MS8)
相关PDF资料 |
PDF描述 |
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| LTC4252A-1CMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| LTC4252A-1IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-1IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
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相关代理商/技术参数 |
参数描述 |
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| LTC4252A-1CMSTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252A-1CMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252A-1IMS | 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-1IMS#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-1IMS#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 |
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