LTC4210-4IS6#PBF Linear Technology, LTC4210-4IS6#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC4210-4IS6#PBF
• Manufacturer: Linear Technology

Specifications of LTC4210-4IS6#PBF

• Linear Misc Type: Positive Low Voltage
• Package Type: TSOT-23
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 7V
• 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
Autoretry After Current Fault (LTC4210-3)
Figure 8 shows the waveforms of the LTC4210-3 (autoretry
version) during a circuit breaker fault. At time point B1, the
TIMER trips the COMP2 threshold of 1.3V. The GATE pin
pulls to ground while TIMER begins a “cool-off” cycle with
a 2µA pull-down to the COMP1 threshold of 0.2V. At time
point C1, the TIMER pin pulls down with approximately a
7k resistor to ground and a GATE start-up cycle is initiated.
If the fault persists, the fault autoretry duty cycle is
approximately 3.8%. Pulling the ON pin low for more than
30µs will stop the autoretry function and put the LTC4210
in reset mode.
Latch-Off After Current Fault (LTC4210-4)
Figure 9 shows the waveforms of the LTC4210-4 (latch-off
version) during a circuit breaker fault. At time point B, the
TIMER trips the COMP2 threshold. The GATE pin pulls to
ground while the TIMER pin is latched high by a 5µA pull-
up. The TIMER pin eventually reaches the soft-clamped
voltage (V
user can either pull the TIMER pin to below 0.2V externally
or cycle the ON pin low for more than 30µs.
V
V
TIMER
I
V
LOAD
GATE
OUT
Figure 8. Automatic Retry After Overcurrent Fault
REGULATING AT 50mV/R
NORMAL
CLAMP
MODE
60µA
A1
FAULT
) of 2.3V. To clear the latchoff mode, the
CB
B1
U
COOL OFF
CYCLE
100µA
SENSE
2µA
U
C1
60µA
A2 B2
FAULT
CB
W
COOL OFF
CYCLE
2µA
4210 F08
U
COMP2
COMP1
Normal Mode/External Timer Control
Whenever the TIMER pin voltage drops below the COMP1
threshold, but is not in reset mode, the TIMER enters
normal (100µA source) mode with an equivalent 7k resis-
tive pull-down. Table 1 shows the relationship of t
t
If the TIMER pin is pulled beyond the COMP2 threshold,
the GATE pin is pulled to ground immediately. This allows
the TIMER pin to be used for overvoltage detection, see
Figure 11.
Externally forcing the TIMER pin below the COMP1 thresh-
old will reset the TIMER to normal mode. During over-
voltage detection, the TIMER’s 100µA pull-down current
will continue to be on if (V
50mV. If the (V
the overvoltage detection, the TIMER current will be the
same as described for latched-off or autoretry mode. See
the section OVERVOLTAGE DETECTION USING TIMER
PIN for details of the application.
CBDELAY
, t
V
V
TIMER
I
V
LOAD
GATE
COOLOFF
Figure 9. Latchoff After Overcurrent Fault
OUT
REGULATING AT 50mV/R
CC
NORMAL
MODE
LTC4210-3/LTC4210-4
– SENSE) voltage exceeds 50mV during
60µA
vs C
FAULT
A
CB
TIMER
B
CC
LATCHED OFF CYCLE
C
.
– SENSE) voltage is below
SENSE
2410 F09
V
COMP2
COMP1
0V
0V
CLAMP
13
INITIAL
421034fa
,