LTC4252A-1CMS#TRPBF Linear Technology, LTC4252A-1CMS#TRPBF Datasheet - Page 31

• Manufacturer Part Number: LTC4252A-1CMS#TRPBF
• Description: IC CNTRLR HOTSWAP NEGVOLT 10MSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC4252A-1CMS#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: LTC4252A-1
• 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

APPLICATIONS INFORMATION
At power-up, Q5 and Q8 are held off low by the SS pin
of the LTC4252; resistors R5 and R8 pull the SENSE pin
closed to V
lower voltage through the body diodes Q2 or Q3 until Q2
or Q3 is turned on. This allows the LTC4252 to perform
a start-up cycle and ramp up the SS and GATE voltage.
As the SS voltage ramps up to 2.2V, it turns on Q5 and Q8
and pulls TIMER low through Q6 and Q9. The sense voltage
EE
. V
(SHORT PIN)
(SHORT PIN)
EE
–48RTN
–48RTN
–48RTN
–48RTN
is connected to the power supply with
–48V
–48V
*MOC207
30.1k
30.1k
392k
392k
1%
1%
1%
1%
R1
R2
R1
R2
*MOC207
Figure 20. Circuit Breaker with Foldback Current Limit Application
Figure 21. Inrush Control Without a Sense Resistor Application
**DIODES, INC
C1
10nF
C1
10nF
**DIODES, INC
C
0.68μF
C
0.68μF
T
T
10
10
8
9
3
8
9
3
OV
TIMER
OV
TIMER
UV
SS
UV
SS
C
68nF
C
68nF
†
SS
SS
RECOMMENDED FOR HARSH ENVIRONMENTS
†
LTC4252A-1
LTC4252A-1
RECOMMENDED FOR HARSH ENVIRONMENTS
V
V
V
V
EE
EE
IN
IN
5
5
1
1
R
3× 1.8k
1/4W EACH
R
3× 1.8k
1/4W EACH
IN
IN
PWRGD
PWRGD
SENSE
SENSE
DRAIN
DRAIN
D
DDZ13B
GATE
GATE
IN
D
DDZ13B
IN
†
†
2
7
6
4
2
7
6
4
**
rises as current flows into R5 and R8 through resistors R3
and R6. The ACL amplifier of the LTC4252 servos the sense
voltage to about 100mV as the GATE voltage regulates Q2
and Q3. Current flows into R4, Q4 and R7, Q7 as Q2 and
Q3 turn on. The respective node voltages at the R3 and R4
connection and the R6 and R7 connection are always kept
equal to their respective sense voltages by the Q4 and Q2
V
and Q8 V
**
DS
drop and the Q7 and Q3 V
C
1μF
LTC4252A-1/LTC4252A-2
IN
C
1μF
IN
R
DS
R3
5.1k
D
R
10Ω
1M
C
C
10nF
R
drop is negligible.
C
LTC4252-1/LTC4252-2
R3
5.1k
D
1M
C3
330nF
25V
*
V
R4
38.3k
*
OUT
R4
1k
1%
V
OUT
C2
10nF
100V
R
R5 27Ω
R
G
G
10Ω
10Ω
+
+
DS
Q1
IRF530S
R
0.02Ω
425212 F20
Q1
IRF530S
425212 F21
C
100μF
S
C
100μF
L
L
drop assuming the Q5
EN
LOAD
EN
LOAD
31
425212fc