SC908 데이터 시트보기 (PDF) - Semtech Corporation
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SC908 Datasheet PDF : 30 Pages
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SC908
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Logic Control Inputs & Status Outputs
Battery Detector Sense Leakage
(BSEN Current)
Battery Detector Activation
Delay(10)
IBSEN_DET
VDET_DEL
V > VAD , or SEN or LEN high,
VAD
UVLO
V = 4.2V
BSEN
Time from first of LEN or SEN high until
LBATB/FAULTB valid, V = 0V
VAD
5
10
μA
70
μs
Logic Input Low
V
LEN, SEN; V = 2.7V
0.4
V
IL
BAT
Logic Input High
V
LEN, SEN; V = 2.7V
IH
BAT
1.5
V
Logic Input Current High
I
IL
LEN, SEN; V = 2.7V
BAT
1
μA
Logic Input Current Low
I
IH
LEN, SEN; V = 2.7V
BAT
1.5
μA
CPB, CHRGB, FLTB, LBATB
V
OL
I = 2mA
SINK
Outputs
I
V = 5V (V = 8V for CPB)
OH
VAD
0.5
V
1
μA
Notes:
(1) VAD is the “Maximum Vsupply” as defined in EIA/JEDEC Standard No. 78, paragraph 2.11.
OP
(2) The value of the buck converter disabled battery leakage current is included in the charger section battery leakage since it cannot be
independently measured (because SVIN is tied to BAT internally). The buck converter contribution to this value is also included in the Buck
Converter section for design guidance only.
(3) VSYS regulation voltage assumes that V exceeds V by the VSYS regulator dropout (typically 0.5V at 5mA, for a minimum regulator
VAD
VSYS
R = 71Ω). If this condition is not met, then V = V minus the VSYS regulator dropout.
DS
VSYS
VAD
(4) I is the supply current from the battery for common reference circuits into the BAT pin when either the buck converter or LDO or charger
Q-Core
are enabled.
(5) tSU_REF is the start-up time of the voltage reference buffer for both the DC-DC buck converter and the LDO, and should be added to the start-up
time (t
or t
respectively) of the first regulator enabled. In the case of the LDO start-up with the switcher disabled, the LDO start-up
SU-SVOUT
SU-LVOUT
time t
is concurrent with the reference start-up time t , and so t
is specified as typically zero.
SU-LVOUT
SU_REF
SU-LVOUT
(6) SVOUT is the buck converter output node, which is the node at which the output inductor is connected to the load. It is the top of the
feedback resistor divider network. See the Typical Application Circuit.
(7) To guarantee positive load threshold hysteresis for PSAVE-to-PWM mode switching with SVOUT > 2.2V, contact your Semtech representative
for application assistance.
(8) If V < V
/ SDC + 150mV, then the maximum output setting is V x SDC + 150mV. Higher output voltage settings are feasible,
BAT
SVOUT_Max
MAX
BAT
MAX
but are subject to load-dependent dropout.
(9) Specified with V = V .
BAT
LVIN
(10) Guaranteed by design.
8
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