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| 型号： | LTC4252-2CMS8#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: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 36/36页 |
| 文件大小： | 336K |
| 代理商： | LTC4252-2CMS8#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
9
425212fc
PIN FUNCTIONS
VIN (Pin 1/Pin 1): Positive Supply Input. Connect this
pin to the positive side of the supply through a dropping
resistor. A shunt regulator clamps VIN at 13V. An internal
undervoltage lockout (UVLO) circuit holds GATE low until
the VIN pin is greater than VLKO, overriding UV and OV. If
UV is high, OV is low and VIN comes out of UVLO, TIMER
starts an initial timing cycle before initiating a GATE ramp-
up. If VIN drops below approximately 8.2V, GATE pulls low
immediately.
PWRGD (Pin 2/Not Available): Power Good Status Output
(MS only). At start-up, PWRGD latches low if DRAIN is
below 2.385V and GATE is within 2.8V of VIN. PWRGD
status is reset by UV, VIN (UVLO) or a circuit breaker fault
timeout. This pin is internally pulled high by a 58μA cur-
rent source.
SS (Pin 3/Pin 2): Soft-Start Pin. This pin is used to ramp
inrush current during start up, thereby effecting control
over di/dt. A 20x attenuated version of the SS pin voltage
is presented to the current limit amplifier. This attenuated
voltage limits the MOSFET’s drain current through the sense
resistor during the soft-start current limiting. At the begin-
ning of a start-up cycle, the SS capacitor (CSS) is ramped
by a 22μA (28μA for the LTC4252A) current source. The
GATE pin is held low until SS exceeds 20 VOS = 0.2V.
SS is internally shunted by a 100k resistor (RSS) which
limits the SS pin voltage to 2.2V (50k resistor and 1.4V
for the LTC4252A). This corresponds to an analog current
limit SENSE voltage of 100mV (60mV for the LTC4252A). If
the SS capacitor is omitted, the SS pin ramps up in about
180μs. The SS pin is pulled low under any of the following
conditions: in UVLO, in an undervoltage condition, in an
overvoltage condition, during the initial timing cycle or
when the circuit breaker fault times out.
SENSE (Pin 4/Pin 3): Circuit Breaker/Current Limit Sense
Pin. Load current is monitored by a sense resistor RS con-
nected between SENSE and VEE, and controlled in three
steps. If SENSE exceeds VCB (50mV), the circuit breaker
comparator activates a (230μA + 8 IDRN) TIMER pull-up
current. If SENSE exceeds VACL, the analog current limit
amplifier pulls GATE down to regulate the MOSFET current
at VACL/RS. In the event of a catastrophic short-circuit,
SENSE may overshoot. If SENSE reaches VFCL (200mV),
the fast current limit comparator pulls GATE low with a
strong pull-down. To disable the circuit breaker and cur-
rent limit functions, connect SENSE to VEE.
(MS/MS8)
TYPICAL PERFORMANCE CHARACTERISTICS
IPGH vs Temperature
tSS vs Temperature
tPLLUG and tPHLOG
vs Temperature
TEMPERATURE (°C)
–55 –35 –15
5
25
45
65
85 105 125
I PGH
(μA)
425212 G38
62
61
60
59
58
57
56
55
VPWRGD = 0V
(MS ONLY)
TEMPERATURE (°C)
–55 –35 –15
5
25
45
65
85 105 125
t SS
(μs)
425212 G27
220
210
200
190
180
170
160
150
SS PIN FLOATING,
VSS RAMPS FROM 0.2V TO 2V
TEMPERATURE (°C)
–55
DELAY
(μs)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–15
25
45
125
425212 G24
–35
5
65
85 105
tPLLUG
tPHLOG
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252-2CMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2CMSTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
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| LTC4252-2IMS | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4252-2IMS#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:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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