參數(shù)資料
型號(hào)： LTC4252A-1IMS#TRPBF
廠商： Linear Technology
文件頁數(shù)： 9/36頁
文件大?。?/td> 328K
描述： IC CNTRLR HOTSWAP NEGVOLT 10MSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開關(guān)： 無
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 帶卷 (TR)
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
9
425212fe
For more information www.linear.com/LTC4252-1
pin FuncTions
V
IN
(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 V
IN
 at 13V . An internal
undervoltage lockout (UVLO) circuit holds GATE low until
the V
IN
 pin is greater than V
LKO
, overriding UV and OV . If
UV is high, OV is low and V
IN
 comes out of UVLO, TIMER
starts an initial timing cycle before initiating a GATE ramp-
up. If V
IN
 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 V
IN
. PWRGD
status is reset by UV , V
IN
 (UVLO) or a circuit breaker fault
timeout. This pin is internally pulled high by a 58礎(chǔ) 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 MOSFETs drain current through the sense
resistor during the soft-start current limiting. At the begin-
ning of a start-up cycle, the SS capacitor (C
SS
) is ramped
by a 22礎(chǔ) (28礎(chǔ) for the LTC4252A) current source. The
GATE pin is held low until SS exceeds 20 " V
OS
 = 0.2V .
SS is internally shunted by a 100k resistor (R
SS
) 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
180祍. 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 R
S
 con-
nected between
 
SENSE and V
EE
, and controlled in three
steps.
 
If SENSE exceeds V
CB
 (50mV), the circuit breaker
comparator activates a (230礎(chǔ) + 8 " I
DRN
) TIMER pull-up
current. If SENSE exceeds V
ACL
, the analog current limit
amplifier pulls GATE down to regulate the MOSFET current
at V
ACL
/R
S
. In the event of a catastrophic short-circuit,
SENSE may overshoot. If SENSE reaches V
FCL
 (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 V
EE
.
(MS/MS8)
Typical perForMance characTerisTics
I
PGH
 vs Temperature
t
SS
 vs Temperature
t
PLLUG
 and t
PHLOG
 
vs Temperature
TEMPERATURE (癈)
55 35 15  5   25   45   65   85  105 125
425212 G38
62
61
60
59
58
57
56
55
V
PWRGD
 = 0V
(MS ONLY)
TEMPERATURE (癈)
55 35 15  5   25   45   65   85  105 125
425212 G27
220
210
200
190
180
170
160
150
SS PIN FLOATING,
V
SS
 RAMPS FROM 0.2V TO 2V
TEMPERATURE (癈)
55
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
15
25   45
125
35
5
65   85  105
t
PLLUG
t
PHLOG
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參數(shù)描述
LTC4252A-2 制造商:LINER 制造商全稱:Linear Technology 功能描述:–48V Hot Swap Controllers
LTC4252A-2CMS 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
LTC4252A-2CMS#PBF 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
LTC4252A-2CMS#TR 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件
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