LTC1479CG Linear Technology, LTC1479CG Datasheet - Page 16

• Manufacturer Part Number: LTC1479CG
• Description: IC CTRLR DUAL BATT SYS 36-SSOP
• Manufacturer: Linear Technology

Specifications of LTC1479CG

• Function: Dual Battery Controller
• Battery Type: Lead Acid, Li-Ion, NiCd, NiMH
• Voltage - Supply: 6 V ~ 28 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
LTC1479
CONTROLLER
16
BATTERY
BATTERY
PACK #2
PACK #1
PowerPath
Li-ION
Li-ION
BACKUP
BAS16LT1
DCIN
Figure 9. LT1304 Micropower Backup Converter Circuit
FROM
DC/DC
FROM
5V
2N7002
CC
470k
D2
R2
Q1
DTA144E
(BOLD LINES INDICATE HIGH CURRENT PATHS)
ROHM
0.1 F
*COILCRAFT 1812LS-105 XKBC [phone]
C2
R
R
R
R
DC2
DC1
B2
B1
U
2.2 F
NiCD
CELL
2
1
16V
10k
330
R1
LBO
LBI
I
INFORMATION
LIM
DCDIV
BAT1
BAT2
V
BDIV
+
DCIN
U
BAT
V
6
CC
R3
22k
+
LT1304
SW
Figure 8. Simplified Dual Li-Ion Battery Power Management System
GND
0.1 F
4
5
0.1 F
SHDN
C1
0.1 F
+
10 H
V
SW A
V
L1*
CCP
FB
GA
IN
W
SAB
8
7
3
1 F
50V
MBR0530
SW B
GB
D1
C3
0.1 F
+
V
+
SW C
5V
FROM
DC/DC
U
GC
CC
R4
390k
1%
R5
100k
1%
1mH*
TO INPUT
OF DC/DC
CONVERTER
LTC1479
SCD
SW D
GD
1479 F09
SW V
1 F
50V
+
SW E
GG
GE
cropower DC/DC converter. As shown in Figure 9, the
LT1304 monitors the input supply voltage and activates
when it drops below 6V.
Power for the DCIN and battery monitors and the logic
supply in the LTC1479 is then obtained from the output of
the LT1304 step-up regulator.
Charger System Interface
The LTC1479 is designed to work directly with constant-
voltage (CV), constant-current (CC) battery chargers such
as the LT1510 and LT1511.
LT1510 Battery Charger Interface
As illustrated in Figure 10, the LT1510 CV/CC battery
charger, takes power from the DC adapter input through
Schottky diode D1. The output of the charger is directed to
SEF
GG SG
SW F
SW G
GF
SENSE
R
0.033
SENSE
+
CHGMON
GH SH
SENSE
V
BKUP
SW H
–
2
5
TRIPLE, HIGH EFFICIENCY,
SWITCHING REGULATOR
LTC1538-AUX
Li-ION BATTERY
MANAGEMENT
REGULATOR
CHARGER
BACKUP
LT1510
POWER
DCIN
P
1479 F08
BACKUP
NiCD
12V AUX
5V
3.3V