Datasheet

LTC3677-3
9
36773f
elecTrical characTerisTics
Pushbutton Controller. The l denotes the specifications which apply
over the full operating junction temperature range, otherwise specifications are at T
J
= 25°C. V
OUT
= 3.8V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Pushbutton Pin (ON)
V
OUT
Pushbutton Operating Supply Range (Note 9)
l
2.7 5.5 V
V
OUT
UVLO V
OUT
Falling
V
OUT
Rising
Pushbutton is Disabled Below V
OUT
UVLO 2.5 2.7
2.8 2.9
V
V
V
ON_TH
ON Threshold Rising
ON Threshold Falling 0.4
0.8
0.7
1.2 V
V
I
ON
ON Input Current V
ON
= V
OUT
V
ON
= 0V
–1
–4 –9
1
–14
μA
μA
Power-On Input Pin (PWR_ON)
V
PWR_ON
PWR_ON Threshold Rising
PWR_ON Threshold Falling 0.4
0.8
0.7
1.2 V
V
I
PWR_ON
PWR_ON Input Current V
PWR_ON
= 3V –1 1 μA
Status Output Pins (PBSTAT, EXTPWR, PGOOD)
I
PBSTAT
PBSTAT Output High Leakage Current V
PBSTAT
= 3V –1 1 μA
V
PBSTAT
PBSTAT Output Low Voltage I
PBSTAT
= 3mA 0.1 0.4 V
I
EXTPWR
EXTPWR Pin Input Current V
EXTPWR
= 3V 0 1 μA
V
EXTPWR
EXTPWR Pin Output Low Voltage I
EXTPWR
= 2mA 0.15 0.4 V
I
PGOOD
PGOOD Output High Leakage Current V
PGOOD
= 3V –1 1 μA
V
PGOOD
PGOOD Output Low Voltage I
PGOOD
= 3mA 0.1 0.4 V
V
THPGOOD
PGOOD Threshold Voltage (Note 13) –8 %
Pushbutton Timing Parameters
t
ON_PBSTAT1
ON Low Time to PBSTAT Low 50 ms
t
ON_PBSTAT2
ON High to PBSTAT High PBSTAT Low > t
PBSTAT_PW
900 μs
t
PBSTAT_PW
PBSTAT Minimum Pulse Width 40 50 ms
t
ON_PUP
ON Low Time for Power-Up 50 ms
t
ON_RST
ON Low to PGOOD Reset Low 12 14 16.5 Seconds
t
ON_RST_PW
PGOOD Reset Low Pulse Width 1.8 ms
t
PUP_PDN
Minimum Time from Power Up to Down 1 Seconds
t
PDN_PUP
Minimum Time from Power Down to Up 1 Seconds
t
PWR_ONH
PWR_ON High to Power-Up 50 ms
t
PWR_ONL
PWR_ON Low to Power-Down 50 ms
t
PWR_ONBK1
PWR_ON Power-Up Blanking PWR_ON Low Recognized from Power-Up 1 Seconds
t
PWR_ONBK2
PWR_ON Power-Down Blanking PWR_ON High Recognized from Power-Down 1 Seconds
t
PGOODH
From Regulation to PGOOD High Buck1, 2 and LDO1 Within PGOOD Threshold 230 ms
t
PGOODL
Bucks Disabled to PGOOD Low Bucks Disabled 44 µs
t
LDO2_BK1
LDO2 Enable to Buck Enable 12.5 14.5 17.5 ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3677-3 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. Note that the maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Note 3: This IC includes over temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when over temperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.