LTC4251-1IS6#PBF Linear Technology, LTC4251-1IS6#PBF Datasheet - Page 16

• Manufacturer Part Number: LTC4251-1IS6#PBF
• Manufacturer: Linear Technology

Specifications of LTC4251-1IS6#PBF

• Family Name: LTC4251-1
• Package Type: TSOT-23
• 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

If the overvoltage glitch is long enough to deplete the load
capacitor, a full start-up cycle may occur as shown be-
tween time points 3 through 6.
LTC4251/LTC4251-1/
LTC4251-2
APPLICATIO S I FOR ATIO
16
GND-V
TIMER
SENSE
U
UV/0V
GATE
V
OUT
V
GND-V
EE
IN
TIMER
SENSE
Figure 8. Power-Up Timing with a Short-Pin (All Waveforms are Referenced to V
UV/0V
GATE
V
V
OUT
V
LKO
EE
IN
U
Figure 7. System Power-Up Timing (All Waveforms are Referenced to V
1
1
2
2
UV/0V CLEARS V
V
V
V
UVHI
IN
LKO
W
CLEARS V
INITIAL TIMING CYCLE
LKO
UVHI
INITIAL TIMING CYCLE
, CHECK V
5.8µA
, CHECK V
5.8µA
U
UVHI
IN
<UV/0V < V
< V
LKO
V
TMRH
– V
V
TMRL
LKH
OVLO
V
TMRH
, TIMER < V
V
, TIMER< V
TMRL
3
58µA
Timer Behavior
In Figure 12a, the TIMER capacitor charges at 230µA if the
SENSE pin exceeds V
4
START-UP CYCLE
3
TIMER CLEARS V
5 6
TMRL
58µA
230µA
TMRL
4
START-UP CYCLE
TIMER CLEARS V
, GATE < V
, GATE < V
5 6
230µA
7 8 9
58µA
7 8 9
GATEL
TMRL
GATEL
V
V
ACL
CB
58µA
, CHECK GATE < V
AND SENSE < V
TMRL
AND SENSE < V
V
V
ACL
CB
, CHECK GATE < V
5.8µA
CB
5.8µA
CB
CB
GATEL
. It is discharged with 5.8µA if the
.
.
GATEL
AND SENSE < V
EE
AND SENSE < V
)
5.8µA
EE
425112 F07
)
CB
5.8µA
425112 F08
.
CB
.
425112fa