SC1458BWLTRT 查看數據表（PDF） - Semtech Corporation
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SC1458BWLTRT Datasheet PDF : 13 Pages
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SC1458
Electrical Characteristics (continued)
Parameter
Symbol
Power Supply Rejection Ratio(2)
PSRR
PGOOD Delay(3)
PGOOD Threshold(3)
Start-Up Time
Power Up Delay Between LDOA
and LDOB
t
PGOOD
V
TH(PGOOD)
t
SU
t
DELAY
Conditions
V = 3.7V, I = 50mA, f = 1kHz,
IN
OUT
C = 22nF
BYP
V = 3.7V, I = 50mA, f = 1kHz
IN
OUT
V
falling
OUT(LDOA)
From OFF to 87% V , I = 50mA,
OUT OUT
CBYP = 22nF
Delay between 0.87V and V start-up
OUTA
OUTB
Min Typ Max Units
65
dB
40
160 200 240
ms
82
87
92
%
1
ms
128
μs
Under Voltage Lockout
UVLO Hysteresis
Over Temperature Protection
Threshold
Over Temperature
Hysteresis
Digital Inputs
VUVLO
V
UVLO-HYS
T
OT
T
OT-HYS
VIN Rising
Rising threshold
2.15 2.25 2.35
V
100
mV
160
°C
20
°C
Logic Input High Threshold
V
IH
Logic Input Low Threshold
V
IL
Logic Input High Current
I
IH
Logic Input Low Current
I
IL
Digital Outputs
V = 5.5V
IN
V = 2.5V
IN
V = 5.5V
IN
V = 5.5V
IN
1.25
V
0.4
V
1
μA
1
μA
PGOOD Output Voltage Low
V
OL
I = 500μA, V = 3.7V
SINK
IN
Notes:
(1) Dropout voltage is defined as V - V , when V is 100 mV below the value of V for V = V +0.5V.
IN OUT
OUT
OUT
IN
OUT
(2) SC1458B only
(3) SC1458A only
7
20
mV
4
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