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LTC1479IG#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LTC1479
PowerPath Controller
for Dual Battery Systems
FEATURES
DESCRIPTION
U
■
Complete Power Path Management for Two
Batteries, DC Power Source, Charger and Backup
■
Compatible with Li-Ion, NiCd, NiMH and Lead-Acid
Battery Chemistries
■
“3-Diode” Mode Ensures Powers is Available
under “Cold Start” Conditions
■
All N-Channel Switching Reduces Power Losses
■
Capacitor and Battery Inrush Current Limited
■
“Seamless” Switching Between Power Sources
■
Independent Charging and Monitoring of Two
Battery Packs
■
New, Small Footprint, 36-Lead SSOP Package
The LTC
®
1479 is the “heart” of a total power management
solution for single and dual battery notebook computers
and other portable equipment. The LTC1479 directs power
from up to two battery packs and a DC power source to the
input of the main system switching regulator. It works in
concert with related LTC power management products
(e.g. LTC1435, LT
®
1511, etc.) to create a total system
solution; starting from the batteries and the DC power
source, and ending at the input of each of the computer’s
complex loads. A system-provided power management
µP monitors and actively directs the LTC1479.
The LTC1479 uses low loss N-channel MOSFET switches
to direct power from three main sources. An adaptive
current limiting scheme reduces capacitor and battery
inrush current by controlling the gates of the MOSFET
switches during transitions. The LTC1479 interfaces di-
rectly to the LT1510, LT1511 and LT1620/LTC1435 bat-
tery charging circuits.
TYPICAL APPLICATION
U
Dual Battery PowerPath
TM
Controller System Block Diagram
PowerPath is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Notebook Computer Power Management
■
Portable Instruments
■
Handheld Terminals
■
Portable Medical Equipment
■
Portable Industrial Control Equipment
APPLICATIONS
U
BAT1
BAT2
BATTERY CHARGER
(LT1510/LT1511/
LT1620/LTC1435)
SW A/B
R
SENSE
SW C/D
SW E/F
SW G
SW H
+
C
IN
DCIN
1479 TA01
5V
AC
ADAPTER
POWER
MANAGEMENT
µP
BACKUP
REGULATOR
(LT1304)
HIGH EFFICIENCY 
DC/DC SWITCHING 
REGULATOR
(LTC1435/LTC1438
ETC.)
LTC1479
PowerPath CONTROLLER
STATUS &
CONTROL
2
LTC1479
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
T
JMAX
= 100°C, θ
JA
= 95°C/W
Consult factory for Military grade parts.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
G PACKAGE (209 mils)
36-LEAD PLASTIC SSOP
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
DCIN
DCDIV
LOBAT
GA
SAB
GB
GC
SCD
GD
GE
SEF
GF
SENSE
+
SENSE
–
V
CC
V
GG
V
+
SW
V
BKUP
BAT1
BAT2
BDIV
V
BAT
CHGMON
BATSEL
GG
SG
GH
SH
DCINGOOD
DCIN/BAT
BATDIS
3DM
CHGSEL
V
CCP
GND
DCIN, BAT1, BAT2 Supply Voltages.......... –0.3V to 32V
SENSE
+
, SENSE
–
, V
BAT
, V
+
..................... –0.3V to 32V
GA, GB, GC, GD, GE, GF, GG, GH .............. –0.3V to 42V
SAB, SCD, SEF, SG, SH ............................ –0.3V to 32V
SW, V
GG
................................................... –0.3V to 42V
DCDIV, BDIV............................................ –0.3V to 5.5V
All Logic Inputs (Note 1).......................... –0.3V to 7.5V
All Logic Outputs (Note 1) ....................... –0.3V to 7.5V
V
CC
Regulator Output Current................................ 1mA
V
CCP
Regulator Output Current .............................. 1mA
V
+
Output Current.................................................. 1mA
V
GG
Regulator Output Current ............................ 100µA
Operating Temperature
LTC1479CG ............................................. 0°C to 70°C
LTC1479IG ........................................ –40°C to 85°C
Junction Temperature........................................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supplies
V
DCIN
DCIN Operating Range (Mode 1) DCIN Selected 6 28 V
V
BAT1
Battery 1 Operating Range (Mode 5) Battery 1 Selected 6 28 V
V
BAT2
Battery 2 Operating Range (Mode 6) Battery 2 Selected 6 28 V
V
BKUP
Backup Operating Range (Mode 8) Backup Operation 6 28 V
I
DCIN
DCIN Operating Current (Mode 1) DCIN Selected 175 500 µA
I
VBAT1
Battery 1 Operating Current (Mode 5) Battery 1 Selected 150 500 µA
I
VBAT2
Battery 2 Operating Current (Mode 6) Battery 2 Selected 150 500 µA
I
VBKUP
Backup Operating Current (Mode 8) Backup Operation (V
BKUP
= 6V) 40 100 µA
V
CCP
V
CCP
Regulator Output Voltage (Modes 1, 5, 6) DCIN, Battery 1 or Battery 2 Selected ● 4.0 4.8 6.0 V
V
CC
V
CC
Regulator Output Voltage (Modes 1, 5, 6) DCIN, Battery 1 or Battery 2 Selected ● 3.3 3.6 3.9 V
V
GG
V
GG
Gate Supply Voltage (Modes 1, 5, 6) DCIN, Battery 1 or Battery 2 Selected ● 34.0 36.3 40.0 V
V
UVLO
UV Lockout Threshold (Mode 9) No Power, V
BATX
Falling from 12V 4.0 4.5 5.0 V
V
UVLOHYS
UV Lockout Hysteresis (Mode 9) No Power, V
BATX
Rising from 1V 0.2 0.5 1.0 V
V
DCIN
= 25V, V
BAT1
= 16V, V
BAT2
= 12V, T
A
= 25°C unless otherwise noted. (Note 2)
DC ELECTRICAL CHARACTERISTICS
LTC1479CG
LTC1479IG
3
LTC1479
V
DCIN
= 25V, V
BAT1
= 16V, V
BAT2
= 12V, T
A
= 25°C unless otherwise noted. (Note 2)
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCIN Good Monitor
V
THDCDIV
DCDIV Threshold Voltage (Mode 1) V
DCDIV
Rising from 1V to 1.5V ● 1.190 1.215 1.240 V
V
HYSDCDIV
DCDIV Hysteresis Voltage (Mode 1) V
DCDIV
Falling from 1.5V to 1V 10 35 50 mV
I
BIASDCDIV
DCDIV Input Bias Current (Mode 1) V
DCDIV
= 1.5V 20 nA
V
LODCGD
DCINGOOD Output Low Voltage (Mode 1) V
DCDIV
= 1V, I
DCINGOOD
= 100µA 0 0.1 0.4 V
I
PUDCGD
DCINGOOD Pull-Up Current (Mode 1) V
DCDIV
= 1.5V, V
DCINGOOD
= 0V 1 2 6 µA
I
LKGDCGD
DCINGOOD Leakage Current (Mode 1) V
DCDIV
= 1.5V, V
DCINGOOD
= 7V ±1 µA
Battery Monitor
V
THLOBAT
Low-Battery Threshold Voltage (Modes 5, 6) V
BDIV
Falling from 1.5V to 1V ● 1.190 1.215 1.240 V
V
HYSLOBAT
Low-Battery Hysteresis Voltage (Modes 5, 6) V
BDIV
Rising from 1V to 1.5V 10 35 50 mV
I
BIASBDIV
BDIV Input Bias Current (Modes 5, 6) V
BDIV
= 1.5V 20 nA
V
LOLOBAT
LOBAT Output Low Voltage (Modes 5, 6) V
BDIV
= 1V, I
LOBAT
= 100µA 0 0.1 0.4 V
I
LKGLOBAT
LOBAT Output Leakage Current (Modes 5, 6) V
BDIV
= 1.5V, V
LOBAT
= 7V ±1 µA
R
ONBATSW
Battery Switch ON Resistance (Modes 5, 6) Each Switch Tested Independently 200 400 800 Ω
I
LKGBATSW
Battery Switch OFF Leakage (Modes 5, 6) Each Switch Tested Independently ±1 µA
Gate Drivers
V
GS(ON)
Gate-to-Source ON Voltage (GA to GF) (Modes 1, 2, 4, 5, 6) I
GS
= –1µA 5.0 5.5 7.0 V
Gate-to-Source ON Voltage (GG, GH) (Modes 2, 4) I
GS
= –1µA 4.5 5.2 7.0 V
V
GS(OFF)
Gate-to-Source OFF Voltage (Modes 1, 2, 4, 5, 6) I
GS
= 100µA 0 0.4 V
I
BSENSE
+ SENSE
+
Input Bias Current (Modes 1, 5, 6) 5 15 30 µA
I
BSENSE
– SENSE
–
Input Bias Current (Modes 1, 5, 6) 5 15 30 µA
V
SENSE
Inrush Current Limit Sense Voltage (Modes 1, 5, 6) ● 0.15 0.20 0.25 V
I
PDSAB
SAB Pull-Down Current (Modes 5, 6) V
SAB
= 10V 30 100 300 µA
I
PDSCD
SCD Pull-Down Current (Mode 1) V
SCD
= 10V 30 100 300 µA
I
PDSEF
SEF Pull-Down Current (Mode 1) V
SEF
= 10V 30 100 300 µA
I
PDSG
SG Pull-Down Current (Mode 1) V
SG
= 10V 3 mA
I
PDSH
SH Pull-Down Current (Mode 1) V
SH
= 10V 3 mA
Charge Monitor
R
ONCMON
CHGMON Switch ON Resistance (Modes 5, 6) Each Switch Tested Independently 50 150 250 Ω
I
LKGCMON
CHGMON Switch OFF Leakage (Modes 5, 6) Each Switch Tested Independently ±1 µA
Digital Inputs
V
HIDIGIN
Input High Voltage (Mode 1) All Digital Inputs ● 2V
V
LODIGIN
Input Low Voltage (Mode 1) All Digital Inputs ● 0.8 V
I
HIDIGIN
Input Leakage Current (Mode 1) All Digital Inputs, V
DIGINX
= 7V ±1 µA
I
LODIGIN
Input Leakage Current (Mode 1) V
DIGINX
= 0V (Note 3) ±1 µA
I
PUDIGIN
Input Pull-Up Current (Mode 1) V
DIGINX
= 0V (Note 4) 1 2 6 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LTC1479IG#PBF

Mfr. #:
Buy LTC1479IG#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC PwrPath Cntr for 2x Bat Ss
Lifecycle:
New from this manufacturer.
Delivery:
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