LTC1558-3.3 Ver la hoja de datos (PDF) - Linear Technology
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LTC1558-3.3 Datasheet PDF : 20 Pages
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LTC1558-3.3/LTC1558-5
ELECTRICAL CHARACTERISTICS VBAT = 1.2V, TA = 0°C to 70°C unless otherwise noted.
SYMBOL
VUVLO(ON)
PARAMETER
VCC UVLO Trip Voltage (Note 4)
VUVLO(OFF) VCC UVLO Recovery Trip Voltage (Note 4)
VLOBAT
VBAT UVLO Trip Voltage (Note 5)
Backup Battery Charger
ICHGF
Battery Charge Current
ICHGT
Programmable Trickle Charge Current Range
QRECH
Fast Recharge Factor (Note 6)
QTRK
Nominal Trickle Charge Multiplier Factor
VCTL(CLAMP) Trickle Charge Clamp Voltage
Pushbutton Reset
VCTL
tCTL
Reset Timer
CTL Input Threshold
CTL Input Low Time (Debounce Time)
tHRESET
tRST
Pushbutton Duration for Hard Reset
RESET Pulse Width
VRST1
VRST
ISC
RESET Output Voltage
RESET Output Voltage
RESET Output Current
Short-Circuit Current
Internal VCC Monitor Comparator
tPLH
VUVLO(ON) Comparator Propagation
Delay (Rising)
Shutdown Pin (Note 3)
VSHDN
SHDN Input Threshold
ISHDN
SHDN Pin Bias Current
Feedback Pin
IFB
FB Pin Bias Current
CONDITIONS
LTC1558-3.3
LTC1558-5
LTC1558-3.3
LTC1558-5
Fast Recharge
ICHGT = 1mA
ICHGT = 1mA
VCTL Low for < tHRESET (Soft Reset)
VCTL Low for > tHRESET (Hard Reset)
VCC = 1V, ISINK = 10µA
VCC = 4.25V, ISINK = 1.6mA
Output Source Current, VCC = 3.3V
Output Source Current, VCC = 5V
Output Sink Current, VCC = 3.3V
Output Sink Current, VCC = 5V
∆VCC = – (9% VCC + 300mV), VOD = 300mV
Logic Low, VIL
Logic High, VIH
VCC = 5V, VSHDN = 0V
MIN TYP MAX UNITS
q 2.90 3.00 3.10
V
q 4.40 4.55 4.70
V
q 3.00 3.10 3.20
V
q 4.55 4.70 4.85
V
q 0.85 0.9 0.95
V
q 11 16 21
mA
0.05
2
mA
1.35 1.6 1.85
C/C
8
10
12
A/A
q 0.45 0.5 0.55
V
250
mV
20
ms
1.10 1.8 3.4
s
q 50 80 150
µs
q 115 185 345
ms
q
5 200
mV
q
0.1 0.4
V
10
mA
20
mA
20
mA
40
mA
9
µs
q
q2
0.8
V
V
q
8
15
µA
1
10
nA
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Quiescent current is measured during pushbutton reset.
Note 3: Only applies to 16-pin version.
Note 4: Thresholds will track each other and are guaranteed not to overlap.
Note 5: Low cell voltage reset is only triggered when 0.25V < VCTL < 0.9V
for at least 20µs while in backup mode.
Note 6: Fast recharge factor is defined as the ratio of charge replenished to
the NiCd battery during fast recharge to the charge drawn from the NiCd
battery during backup.
Note 7: The LTC1558 switches automatically between the low and high
operating current levels. See Applications Information for more details.
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