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LTC1479 Datasheet(PDF) 16 Page - Linear Technology

Part # LTC1479
Description  PowerPath Controller for Dual Battery Systems
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1479 Datasheet(HTML) 16 Page - Linear Technology

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LTC1479
APPLICATIONS INFORMATION
DCIN
DCIN
BAT1
BAT2
+
+
V+
SW VGG
1
µF
50V
1
µF
50V
1mH*
VCC
+
RSENSE
0.033
Ω
SW A
SW B
SW C
SW D
SW E
SW F
GA
330
Ω
GB
GC
GD
GE
GF
SAB
SCD
SEF
SENSE + SENSE –
2
5
+
VCCP
2.2
µF
16V
0.1
µF
VBAT
POWER
MANAGEMENT
µP
BDIV
VBKUP
BACKUP
REGULATOR
LTC1538-AUX
TRIPLE, HIGH EFFICIENCY,
SWITCHING REGULATOR
DCDIV
0.1
µF
LTC1479
LT1510
Li-ION BATTERY
CHARGER
GG SG
GH SH
CHGMON
3.3V
5V
SW G
SW H
DCIN
Li-ION
BATTERY
PACK #1
Li-ION
BATTERY
PACK #2
1479 F08
BACKUP
NiCD
*COILCRAFT 1812LS-105 XKBC (708) 639-1469
12V AUX
RB2
RB1
RDC2
RDC1
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
FROM
PowerPath
CONTROLLER
BACKUP
NiCD
CELL
TO INPUT
OF DC/DC
CONVERTER
L1*
10
µH
(BOLD LINES INDICATE HIGH CURRENT PATHS)
5VCC
FROM
DC/DC
D1
MBR0530
R4
390k
1%
R5
100k
1%
SW
+
FB
SHDN
VIN
GND
LT1304
C1
0.1
µF
C3
0.1
µF
ILIM
R3
22k
LBI
R2
470k
4
8
7
3
5
1479 F09
C2
0.1
µF
1
6
2
LBO
5VCC
FROM
DC/DC
D2
BAS16LT1
Q1
2N7002
ROHM
DTA144E
R1
10k
Figure 9. LT1304 Micropower Backup Converter Circuit
Figure 8. Simplified Dual Li-Ion Battery Power Management System



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