LTC1558-3.3/LTC1558-5
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
Terminal Voltages
V
CC ..........................................................................................
6V
V
BAK
, BACKUP ..................................................... 12V
SW ...................................................................... 14V
All Other Pins .................................. – 0.3V to V
CC
+ 0.3V
Input Currents (SW) ........................................... 500mA
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
SW 1
GND 2
CTL 3
FB 4
8 V
BAK
7 V
CC
6 BACKUP
5 RESET
TOP VIEW
SW 1
SW 2
PGND 3
GND 4
CTL 5
SHDN 6
16 V
BAK
15 V
BAK
14 V
CC
13 BACKUP
12 RESET
11 RESET
10 NC
9
LOBAT
LTC1558CS8-3.3
LTC1558CS8-5
S8 PART MARKING
155833
15585
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 130°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
V
BAT
V
REF
I
VCC
I
BAT
PARAMETER
Operating Voltage Range
Backup Battery Cell Voltage
Internal Reference Voltage
Quiescent Supply Current (Note 2)
Peak Inductor Current (Backup Mode)
Battery Backup Switching
V
BAT
= 1.2V, T
A
= 0°C to 70°C unless otherwise noted.
MIN
q
q
q
q
q
CONDITIONS
LTC1558-3.3
LTC1558-5
Boost Converter in Low Current Mode (Note 7)
Boost Converter in High Current Mode (Note 7)
V
CC
= 0V
Voltage at V
FB
Relative to V
REF
Voltage at V
FB
Relative to V
REF
Voltage at V
FB
Relative to V
REF
Voltage at V
FB
Relative to V
REF
I
BAT(SHDN)
Battery Standby Current
I
VCC(SHDN)
Supply Current During Shutdown (Note 3)
V
BAK(ON)
V
BST(ON)
V
BAK(OFF)
V
BST(OFF)
V
LOBAT
Backup Request Trip Point
Boost Converter Assertion Trip Point
Backup Deassertion Trip Point
Boost Converter Deassertion Trip Point
Low V
BAT
Detect (Note 3)
2
U
U
W
W W
U
W
V
BAK
Output Current ................... Short-Circuit Protected
Operating Ambient Temperature Range ....... 0°C to 70°C
Junction Temperature .......................................... 125°C
Storage Temperature Range .................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
ORDER PART
NUMBER
LTC1558CGN-3.3
LTC1558CGN-5
LTC1558CS-3.3
LTC1558CS-5
FB 7
NC 8
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 110°C/ W (GN)
T
JMAX
= 125°C,
θ
JA
= 110°C/ W (S)
TYP
MAX
3.465
5.250
UNITS
V
V
V
V
µA
mA
mA
µA
µA
%
%
%
%
V
2.90
4.40
1.0
1.247
80
225
1.2
1.272
155
165
330
0.1
– 10.5
– 10.5
–9
– 10.5
0.95
– 7.5
– 7.5
–6
– 7.5
1
1.5
1.297
250
225
445
15
50
– 5.5
– 5.5
–4
– 5.5
1.05
q
q
q
q
q
q
q
q
q
LINER [ LINEAR TECHNOLOGY ]
