LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
pushbuTTon inTerFace elecTrical characTerisTics The l denotes
specifications that apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2).
VBAT = 3.8V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
t
Power-Up from USB Present to Power-Up Starting in the Hard Reset (HR) or Power-Off
100
ms
EXTPWR
(PUP1 or PUP2) State
(POFF) States
t
Any PWR_ONx High to Power-On State
Starting with Both PWR_ONx Low in the Power-
Off (POFF) State
900
µs
PON_UP
t
t
t
PWR_ONx Low to Buckx Disabled
1
5
1
µs
s
PON_DIS
Power-Up (PUP1 or PUP2) State Duration
PUP
Power-Down (PDN1 or PDN2) State
Duration
s
PDN
t
t
Bucks in Regulation to PGOOD High
All Enabled Bucks within PGOOD Threshold
Voltage
230
100
ms
µs
PGOODH
PGOODL
Bucks Disabled to PGOOD Low
All Bucks Disabled
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 4. V is the greater of V
Note 5. Total Battery Drain Current is the sum of I
or BAT.
CC
BUS
and I
For
BATQ
OUT.
example, in applications where the buck input (BVIN pin) is connected to
the PowerPath output (V pin) such that I = I , total battery drain
OUT
OUT
BVIN
current = I
+ I
.
BVIN
Note 2: The LTC3554 is tested under pulsed load conditions such that
BATQ
T ≈ T . The LTC3554 are guaranteed to meet specifications from
Note 6. hC/10 is expressed as a fraction of programmed full charge
J
A
0°C to 85°C junction temperature. 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 consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
current with specified PROG resistor.
Note 7. The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the absolute maximum specified pin current rating may result in
device degradation or failure.
Note 8. FB High, Not Switching
Note 9. V
not in UVLO.
OUT
The junction temperature (T , in °C) is calculated from the ambient
J
Note 10. PGOOD threshold is expressed as a percentage difference from
the buck regulation voltage. The threshold is measured with the buck
feedback pin voltage rising.
temperature (T , in °C) and power dissipation (P , in Watts) according to
A
D
the formula:
T = T + (P • θ )
JA
J
A
D
Note 11. See the Operation section of this data sheet for detailed
explanation of the pushbutton state machine and the effects of each state
on switching regulator and power manager operation.
where θ (in °C/W) is the package thermal impedance.
JA
Note 3. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 12. If V
< V
then V
= 0 and the forward voltage across
BUS
UVLO
FWD
the ideal diode is equal to its current times R
.
DROPOUT
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