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参数资料
型号： LTC4214-2IMS#TR
厂商： Linear Technology
文件页数： 13/32页
文件大小： 277K
描述： IC CONTROLLER HOTSWAP NEG 10MSOP
标准包装： 2,500
类型： 热交换控制器
应用： 通用
内部开关： 无
电源电压： 6 V ~ 16 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： 带卷 (TR)
LTC4214-1/LTC4214-2
13
421412f
APPLICATIO  S I FOR  ATIO
U
U
U
SUPPLY VOLTAGE
The LTC4214 requires a (V
IN
  V
EE
) voltage of 6V to 16V
to function. This can be derived from GND and 12V of a
12V system or the 3.3V and 5.2V of a 5.2V system. The
positive supply is connected to V
IN
 via an RC network
so that the LTC4214 can have a usable V
IN
 during load
short or other transient events when (V
IN
  V
EE
) glitches
below 6V.
INTERNAL UNDERVOLTAGE LOCKOUT (UVLO)
A hysteretic comparator, UVLO, monitors V
IN
  for
undervoltage. The thresholds are defined by V
LKO
 and its
hysteresis, V
LKH
. When V
IN
 rises above 5.1V (V
LKO
) the
chip is enabled; below 4.8V (V
LKO
  V
LKH
) it is disabled and
GATE is pulled low. The UVLO function at V
IN
 should not
be confused with the UV/OV pins. These are completely
separate functions.
UV/OV COMPARATORS
An UV hysteretic comparator detects undervoltage condi-
tions at the UV pin, with the following thresholds:
UV low-to-high (V
UVHI
) = 2.25V
UV high-to-low (V
UVHI
 V
UVHST
) = 2V
An OV hysteretic comparator detects overvoltage condi-
tions at the OV pin, with the following thresholds:
OV low-to-high (V
OVHI
) = 3V
OV high-to-low (V
OVHI
 V
0VHST
) = 2.85V
In Figure 2, a divider (R1-R2) is used to scale the supply
voltage of 12V ?0%. Using R1 = 121k and R2 = 32.4k
gives a typical operating range of 10.7V to 13.5V. The
under and overvoltage shutdown thresholds are then 9.5V
to 14.2V. 1% divider resistors are recommended to pre-
serve threshold accuracy.
The R1-R2 divider values shown in Figure 2 set a standing
current of slightly more than 75礎 and define an imped-
ance at UV/OV of 25k&. In most applications, 25k&
impedance coupled with 250mV UV hysteresis makes the
LTC4214 insensitive to noise. If more noise immunity is
desired, add a 1nF to 10nF filter capacitor from UV/OV
to V
EE
.
Separate UV and OV pins can be used for a wider
operating range such as 10V to 14V as shown in Figure 3.
Other combinations are possible with different resistor
arrangements.
Figure 3. 12V/2A Application with Wider Input Operating Range
4214 F03
GND
UV
Z1
OV
V
EE
V
IN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4214-1
R1
124k
1%
R
X
10&
R
IN
470&
C
X
100nF
R3
32.4k
1%
R2
3.65k
1%
C
T
47nF
C
SS
22nF
C
C
10nF
12V
R
S
0.025&
Q1
IRF7413
R
C
10&
R4
100k
Q2
NDS0605
1
9
8
10
3
2
7
6
4
5
C2
1nF
C
IN
0.1礔
C
L
100礔
GND
(SHORT PIN)
+
R
D
475k
EN
R
PULLDN
10k
V
OUT
GND
Z1: SMAJ15A
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