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LTC1558-5 Datasheet

Backup Battery Controller with Programmable Output

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LTC1558-5 pdf
LTC1558-3.3/LTC1558-5
Backup Battery Controller
with Programmable Output
FEATURES
s Complete Battery Backup System in an
SO-8, 16-Pin GN or SO Package
s Generates Adjustable Backup Voltage from a
Single 1.2V NiCd Button Cell
s Automatic Main Supply to Backup Switching
s Minimum 100mW Output Power
s Automatic Fast Recharge of NiCd Battery
s Programmable NiCd Trickle Charge Current
s Smart NiCd Charger Minimizes Recharge Time and
Maximizes System Efficiency After Backup
s On-Chip Power-On Reset
s Pushbutton Reset Input
s Reset Assertion Guaranteed at VCC = 1V
s Short-Circuit Protection
s Thermal Limiting
U
APPLICATIONS
s Notebook Computers
s Palmtop Computers/PDAs
s Portable Instruments
s Battery-Powered Systems
DESCRIPTION
The LTC®1558 is a backup battery controller that provides
all the functions necessary to implement a backup power
supply using a single NiCd cell. It includes a 1.2V boost
converter, an intelligent 2-stage battery charger, auto-
matic backup switching and a microprocessor reset gen-
erator. The boost converter uses a synchronous switching
architecture to achieve a typical efficiency of 70%, ensur-
ing maximum backup lifetime from a small NiCd cell.
The on-chip NiCd charger uses an internal gas gauge to
minimize fast recharge time and prevent overcharging of
the backup cell. The LTC1558 also provides a user pro-
grammable trickle charge current to compensate for self
discharge losses in the backup cell.
The LTC1558’s automatic backup switching architecture
requires minimum intervention from the host system and
provides feedback to the host to minimize system loading
in the backup state. Its internal VCC fault detector and reset
generator eliminate the need for a separate microproces-
sor supervisory chip in most applications.
The LTC1558 is available in an SO-8, 16-lead GN or SO
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
1.2V
NiCd
BACKUP
**BATTERY
+
C1
1µF
RESET
S1
L1
22µH*
LTC1558-3.3
R1
14k
1 SW
VBAK 8
2
GND
VCC 7
36
CTL BACKUP
4
FB
5
RESET
+ C2
0.1µF
R2
100k
SYSTEM
µP
MAIN
BATTERY
4.5V TO 10V
Q1
Si4431DY
R3
220k
R4 +
221k
1%
R5
100k
1%
CIN
100µF
16V
×2
LTC1435
SYNCHRONOUS
BUCK REGULATOR
VCC
3.3V
*SUMIDA CD54-22µH
**SANYO CADNICA N-110AA
CONSULT LTC1435 DATA SHEET FOR
CIRCUIT APPLICATION INFORMATION
LOAD CURRENT
3A AT NORMAL MODE
30mA AT BACKUP MODE
1558 TA01
Backup Time
vs 3.3V Output Load Current
450
VCC = 3.3V
400 VBAK = 3.78V
NiCd CELL
350 CAPACITY = 110mAHrs
300
250
200
150
100
50
0
0 5 10 15 20 25 30
LOAD CURRENT (mA)
1558 TA02
1


Linear Technology Electronic Components Datasheet

LTC1558-5 Datasheet

Backup Battery Controller with Programmable Output

No Preview Available !

LTC1558-5 pdf
LTC1558-3.3/LTC1558-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Terminal Voltages
VCC .......................................................................................... 6V
VBAK, BACKUP ..................................................... 12V
SW ...................................................................... 14V
All Other Pins .................................. – 0.3V to VCC + 0.3V
Input Currents (SW) ........................................... 500mA
VBAK 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
PACKAGE/ORDER INFORMATION
TOP VIEW
SW 1
GND 2
CTL 3
FB 4
8 VBAK
7 VCC
6 BACKUP
5 RESET
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W
ORDER PART
NUMBER
LTC1558CS8-3.3
LTC1558CS8-5
S8 PART MARKING
155833
15585
Consult factory for Industrial and Military grade parts.
SW 1
SW 2
PGND 3
GND 4
CTL 5
SHDN 6
FB 7
NC 8
TOP VIEW
16 VBAK
15 VBAK
14 VCC
13 BACKUP
12 RESET
11 RESET
10 NC
9 LOBAT
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W (GN)
TJMAX = 125°C, θJA = 110°C/ W (S)
ORDER PART
NUMBER
LTC1558CGN-3.3
LTC1558CGN-5
LTC1558CS-3.3
LTC1558CS-5
ELECTRICAL CHARACTERISTICS VBAT = 1.2V, TA = 0°C to 70°C unless otherwise noted.
SYMBOL PARAMETER
Battery Backup Switching
VCC Operating Voltage Range
VBAT Backup Battery Cell Voltage
VREF Internal Reference Voltage
IVCC Quiescent Supply Current (Note 2)
IBAT Peak Inductor Current (Backup Mode)
IBAT(SHDN)
IVCC(SHDN)
VBAK(ON)
VBST(ON)
VBAK(OFF)
VBST(OFF)
VLOBAT
Battery Standby Current
Supply Current During Shutdown (Note 3)
Backup Request Trip Point
Boost Converter Assertion Trip Point
Backup Deassertion Trip Point
Boost Converter Deassertion Trip Point
Low VBAT Detect (Note 3)
CONDITIONS
LTC1558-3.3
LTC1558-5
Boost Converter in Low Current Mode (Note 7)
Boost Converter in High Current Mode (Note 7)
VCC = 0V
Voltage at VFB Relative to VREF
Voltage at VFB Relative to VREF
Voltage at VFB Relative to VREF
Voltage at VFB Relative to VREF
MIN TYP MAX
q 2.90
q 4.40
3.465
5.250
q 1.0 1.2 1.5
q 1.247 1.272 1.297
q 155 250
q 80 165 225
q 225 330 445
q 0.1 15
q 50
q – 10.5 – 7.5 – 5.5
q – 10.5 – 7.5 – 5.5
q –9 –6 –4
q – 10.5 – 7.5 – 5.5
q 0.95 1 1.05
UNITS
V
V
V
V
µA
mA
mA
µA
µA
%
%
%
%
V
2


Part Number LTC1558-5
Description Backup Battery Controller with Programmable Output
Maker Linear Technology
Total Page 20 Pages
PDF Download
LTC1558-5 pdf
LTC1558-5 Datasheet PDF
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