LTC4210-2IS6#PBF Linear Technology, LTC4210-2IS6#PBF Datasheet - Page 12

• Manufacturer Part Number: LTC4210-2IS6#PBF
• Manufacturer: Linear Technology

Specifications of LTC4210-2IS6#PBF

• Linear Misc Type: Positive Low Voltage
• Family Name: LTC4210-2
• Package Type: TSOT-23
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 16.5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Height (mm): 0.9mm
• Product Length (mm): 2.9mm
• Mounting: Surface Mount
• Pin Count: 6
• Lead Free Status / RoHS Status: Compliant

APPLICATIO S I FOR ATIO
LTC4210-1/LTC4210-2
The current through R
components; I
(C
The capacitive load typically dominates.
For a successful start-up without current limit, I
I
Due to the voltage follower configuration, the V
rate approximately tracks V
At time point 6, V
up continues until it reaches a maximum voltage. This
maximum voltage is determined either by the charge
pump or the internal clamp.
Start-Up Cycle With Current Limit
If the duration of the current limit is brief during start-up
(Figure 4) and it did not last beyond the circuit breaker
function time out, the GATE behaves the same as in start-
up without current limit except for the time interval be-
tween time point 5A and time point 5B. The servo amplifier
limits I
Equations 8 and 9 are applicable but with a lower GATE and
V
Gate Start-Up Time
The start-up time without current limit is given by:
12
LIMIT
OUT
LOAD
I
I
I
t
t
RSENSE
RSENSE
RSENSE
STARTUP
STARTUP
V
:
ramp rate.
OUT
) and I
T
RSENSE
= I
LOAD
I
I
CLOAD
C
CLOAD
LIMIT
by decreasing the I
C
LOAD
CLOAD
C
C
LOAD
GATE
GATE
OUT
due to the noncapacitive load elements.
U
+ I
is approximately V
R
due to the total load capacitance
•
•
•
LOAD
50
I
SENSE
V
GATE
SENSE
V
V
TH
mV
V
I
TH
U
GATE
GATE
OUT
T
T
GATE
< I
V
LIMIT
can be divided into two
IN
C
:
GATE
GATE
C
I
I
W
GATE
LOAD
GATE
•
current (<10 A).
IN
I
GATE
V
but GATE ramp-
IN
I
LIMIT
U
OUT
RSENSE
ramp
(10)
(7)
(8)
(9)
<
During current limiting, the second term in Equation 10 is
partly modified from C
V
For successful completion of current limit start-up cycle
there must be a net current to charge C
current limit duration must be less than t
second term in equation 11 has to fulfill equation 12.
I
V
RSENSE
IN
V
TIMER
V
GATE
V
OUT
t
C
V
/I
ON
STARTUP
IN
CLOAD
LOAD
>2.5V
RESET
MODE
•
>1.3V
. The start-up time is now given by:
I
1
RSENSE
Figure 4. Operating Sequence with
Current Limiting at Start-Up Cycle
2
C
C
GATE
GATE
V
INITIAL
5 A
CYCLE
IN
–
•
•
I
LOAD
I
I
3 4 5
GATE
GATE
V
V
REGULATED AT 50mV/R
TH
TH
GATE
COMP2
COMP1
100 A
10 A
START-UP
t
CYCLE
V
C
CBDELAY
C
TH
• V
5A
LOAD
LOAD
<10 A
60 A
IN
5B 6
/I
•
•
GATE
10 A
2 A
I
I
NORMAL
RSENSE
CLOAD
SENSE
CYCLE
V
IN
LOAD
CBDELAY
to C
V
7
100 A
IN
–
and the
DISCHARGE
BY LOAD
LOAD
I
LOAD
4210 F04
. The
421012f
(12)
(11)
•