LTC1558-5 Linear Technology, LTC1558-5 Datasheet - Page 3

• Manufacturer Part Number: LTC1558-5
• Description: Backup Battery Controller with Programmable Output
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
The
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.
SYMBOL
V
V
V
Backup Battery Charger
I
I
Q
Q
V
Pushbutton Reset
V
t
Reset Timer
t
t
V
V
I
Internal V
t
Shutdown Pin (Note 3)
V
I
Feedback Pin
I
CHGF
CHGT
CTL
HRESET
RST
SC
PLH
SHDN
FB
UVLO(ON)
UVLO(OFF)
LOBAT
CTL(CLAMP)
CTL
RST1
RST
SHDN
RECH
TRK
denotes specifications which apply over the full operating
CC
Monitor Comparator
PARAMETER
V
V
V
Battery Charge Current
Programmable Trickle Charge Current Range
Fast Recharge Factor (Note 6)
Nominal Trickle Charge Multiplier Factor
Trickle Charge Clamp Voltage
CTL Input Threshold
CTL Input Low Time (Debounce Time)
Pushbutton Duration for Hard Reset
RESET Pulse Width
RESET Output Voltage
RESET Output Voltage
RESET Output Current
Short-Circuit Current
V
Delay (Rising)
SHDN Input Threshold
SHDN Pin Bias Current
FB Pin Bias Current
CC
CC
BAT
UVLO(ON)
UVLO Trip Voltage (Note 4)
UVLO Recovery Trip Voltage (Note 4)
UVLO Trip Voltage (Note 5)
Comparator Propagation
CONDITIONS
LTC1558-3.3
LTC1558-5
LTC1558-3.3
LTC1558-5
Fast Recharge
I
I
V
V
V
V
Output Source Current, V
Output Source Current, V
Output Sink Current, V
Output Sink Current, V
Logic Low, V
Logic High, V
V
CHGT
CHGT
CTL
CTL
CC
CC
CC
V
CC
V
= 1V, I
= 4.25V, I
= 5V, V
BAT
Low for < t
Low for > t
= – (9% V
= 1mA
= 1mA
= 1.2V, T
SINK
SHDN
IL
IH
SINK
= 10 A
HRESET
HRESET
CC
Note 5: Low cell voltage reset is only triggered when 0.25V < V
for at least 20 s 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.
= 0V
+ 300mV), V
= 1.6mA
A
= 0 C to 70 C unless otherwise noted.
CC
CC
(Soft Reset)
(Hard Reset)
CC
CC
= 3.3V
= 5V
= 3.3V
= 5V
OD
LTC1558-3.3/LTC1558-5
= 300mV
2.90
4.40
3.00
4.55
0.85
0.05
1.35
0.45
1.10
MIN
115
11
20
50
8
2
3.00
4.55
3.10
4.70
TYP
185
0.9
1.6
0.5
1.8
0.1
16
10
80
10
20
20
40
5
9
8
1
MAX
3.10
4.70
3.20
4.85
0.95
1.85
0.55
250
150
345
200
3.4
0.4
0.8
21
12
15
10
2
CTL
< 0.9V
UNITS
3
C/C
A/A
mA
mA
mV
mV
mA
mA
mA
mA
ms
ms
nA
V
V
V
V
V
V
V
V
V
A
s
s
s