LTC4214-1CMS Linear Technology, LTC4214-1CMS Datasheet - Page 13

• Manufacturer Part Number: LTC4214-1CMS
• Description: IC CTRLR HOTSWAP NEGVOLT 10MSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC4214-1CMS

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 6 V ~ 16 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
SUPPLY VOLTAGE
The LTC4214 requires a (V
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
so that the LTC4214 can have a usable V
short or other transient events when (V
below 6V.
INTERNAL UNDERVOLTAGE LOCKOUT (UVLO)
A hysteretic comparator, UVLO, monitors V
undervoltage. The thresholds are defined by V
hysteresis, V
chip is enabled; below 4.8V (V
GATE is pulled low. The UVLO function at V
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
UV high-to-low (V
LKH
. When V
U
UVHI
UVHI
(SHORT PIN)
) = 2.25V
– V
U
IN
IN
–12V
GND
GND
rises above 5.1V (V
LKO
UVHST
– V
3.65k
32.4k
100nF
Figure 3. – 12V/2A Application with Wider Input Operating Range
124k
Z1: SMAJ15A
1%
1%
1%
R1
R2
R3
C
EE
– V
10
X
R
) voltage of 6V to 16V
IN
) = 2V
X
W
LKH
via an RC network
) it is disabled and
IN
C2
1nF
– V
IN
IN
Z1
during load
EE
LKO
should not
C
47nF
U
) glitches
T
LKO
10
and its
IN
9
8
3
) the
UV
OV
TIMER
SS
C
22nF
for
SS
470
R
LTC4214-1
IN
V
V
EE
IN
5
1
PWRGD
DRAIN
SENSE
An OV hysteretic comparator detects overvoltage condi-
tions at the OV pin, with the following thresholds:
In Figure 2, a divider (R1-R2) is used to scale the supply
voltage of 12V 10%. 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 A 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
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.
GATE
OV low-to-high (V
OV high-to-low (V
EE
2
7
6
4
.
C
0.1 F
100k
IN
R4
LTC4214-1/LTC4214-2
R
10
C
C
10nF
475k
R
C
Q2
NDS0605
D
OVHI
OVHI
+
) = 3V
– V
Q1
IRF7413
4214 F03
R
0.025
S
C
100 F
0VHST
L
R
10k
PULLDN
GND
EN
V
OUT
) = 2.85V
13
421412f