LTC4252-2CMS#TRPBF Linear Technology, LTC4252-2CMS#TRPBF Datasheet - Page 15
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LTC4252-2CMS#TRPBF
Manufacturer Part Number
LTC4252-2CMS#TRPBF
Description
IC CNTRLR HOTSWAP NEGVOLT 10MSOP
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Specifications of LTC4252-2CMS#TRPBF
Applications
General Purpose
Internal Switch(s)
No
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Family Name
LTC4252-2
Package Type
MSOP
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Product Depth (mm)
3mm
Product Height (mm)
0.86mm
Product Length (mm)
3mm
Mounting
Surface Mount
Pin Count
10
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
APPLICATIO S I FOR ATIO
tions, 30kΩ impedance coupled with 300mV UV hyster-
esis makes the LTC4252 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 are available in the 10-pin MS
package and can be used for a different operating range
such as 35.5V to 76V as shown in Figure 3. Other combi-
nations are possible with different resistor arrangements.
UV/OV COMPARATORS (LTC4252A)
A UV hysteretic comparator detects undervoltage condi-
tions at the UV pin, with the following thresholds:
An OV hysteretic comparator detects overvoltage condi-
tions at the OV pin, with the following thresholds:
The UV and OV trip point ratio is designed to match the
standard telecom operating range of 43V to 71V when
connected together as in Figure 2. A divider (R1, R2) is used
to scale the supply voltage. Using R1 = 390k and R2 = 30.1k
UV low-to-high (V
UV high-to-low (V
OV low-to-high (V
OV high-to-low (V
EE
.
U
(SHORT PIN)
UV
UV
OV
OV
) = 3.08V
) = 5.09V
– V
– V
–48V
U
GND
GND
UVHST
OVHST
* M0C207
Q2: MMBT5551LT1
Figure 4. – 48V/2.5A Application with Wider Input Operating Range
464k
10k
34k
1%
1%
1%
R1
R2
R3
) = 2.756V
) = 4.988V
W
C2
10nF
C
0.68µF
T
U
10
9
8
3
UV
OV
TIMER
SS
C
68nF
SS
LTC4252A-1
V
V
EE
IN
5
1
gives a typical operating range of 43V to 71V. The under-
voltage shutdown and overvoltage recovery thresholds are
then 38.5V and 69.6V respectively. 1% divider resistors are
recommended to preserve threshold accuracy.
The R1-R2 divider values shown in Figure 2 set a standing
current of slightly more than 100µA and define an imped-
ance at UV/OV of 28kΩ. In most applications, 28kΩ
impedance coupled with 324mV UV hysteresis makes the
LTC4252A insensitive to noise. If more noise immunity is
desired, add a 1nF to 10nF filter capacitor from UV/OV to
V
The UV and OV pins can be used for a wider operating
range such as 35.5V to 76V as shown in Figure 4. Other
combinations are possible with different resistor
arrangements.
UV/OV OPERATION
A low input to the UV comparator will reset the chip and
pull the GATE and TIMER pins low. A low-to-high UV
transition will initiate an initial timing sequence if the other
interlock conditions are met. A high-to-low transition in
the UV comparator immediately shuts down the LTC4252,
pulls the MOSFET gate low and resets the latched PWRGD
high.
R
10k
1/2W
IN
EE
PWRGD
SENSE
DRAIN
GATE
.
LTC4252A-1/LTC4252A-2
2
7
6
4
22k
C
1µF
R4
LTC4252-1/LTC4252-2
IN
R
D
1M
Q2
R5
2.2k
R
10Ω
C
100µF
C
10nF
C
*
C
L
+
4252-1/2 F04
Q1
IRF530S
R
0.02Ω
S
EN
LOAD
15
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