LTC1479 LINER [Linear Technology], LTC1479 Datasheet - Page 4

• Manufacturer Part Number: LTC1479
• Description: PowerPath Controller for Dual Battery Systems
• Manufacturer: LINER [Linear Technology]

AC ELECTRICAL CHARACTERISTICS
LTC1479
V
SYMBOL
t
t
t
t
t
t
t
t
f
t
t
SELECTED MODES
NO. MODE
1
2
3
4
5
6
7
8
9
10 DC Reconnected
11 DC Connected
* 3DM = Three Diode Mode. When this mode is invoked, only the first
4
The
temperature range.
Note 1: The logic inputs are high impedance CMOS gates with ESD
protection diodes to ground and therefore should not be forced below
ground. These inputs can however be driven above the V
rails as there are no clamping diodes connected between the input pins
and the supply rails. This facilitates operation in mixed 5V/3V systems.
Note 2: The Selected Operating Mode Truth Table, which defines the
operating conditions and logical states associated with each “normal”
operating mode, should be used in conjunction with the Electrical
TRUTH TABLE
ONGA/GB
ONGC/GD
ONGE/GF
OFFGA/GB
OFFGC/GD
OFFGE/GF
ONGG/GH
OFFGG/GH
OVGG
dLOBAT
dDCINGOOD
DCIN
MOSFET switch in each back-to-back switch pair, i. e., SW A, SW C and
SW E is turned on. Current may still pass through the inherent body
diode of the idled switches, i.e., SW B, SW D and SW F to help restart
DC Operation
DC Operation and
BAT1 Charging
DC Operation and
BAT2 Disconnected
DC Operation and
BAT2 Charging
BAT1 Operation
BAT2 Operation
BAT1 Low and
Disconnected
Backup Operation
No Power
(No Backup)
and Reset
denotes specifications which apply over the full operating
= 25V, V
PARAMETER
Gate A/B Turn-On Time
Gate C/D Turn-On Time
Gate E/F Turn-On Time
Gate A/B Turn-Off Time
Gate C/D Turn-Off Time
Gate E/F Turn-Off Time
Gate G/H Turn-On Time
Gate G/H Turn-Off Time
V
LOBAT Delay Times
DCINGOOD Delay Times
BAT1
GG
Reg Operating Frequency
= 16V, V
3DM DCIN/BAT BATSEL BATDIS CHGSEL
H
H
H
H
H
H
H
H
H
L
L
BAT2
(Selected Operating Modes)
H
H
H
H
H
= 12V, T
L
L
L
L
L
L
LOGIC INPUTS
A
H
H
H
H
H
H
H
L
L
L
L
= 25 C unless otherwise noted. (Note 2)
CONDITIONS
V
V
V
V
V
V
V
V
GS
GS
GS
GS
GS
GS
GS
GS
V
V
BDIV
DCDIV
CCP
> 3V (Note 5)
> 3V (Note 5)
> 3V (Note 5)
< 1V (Note 5)
< 1V (Note 5)
< 1V (Note 5)
> 3V (Note 5)
< 1V (Note 5)
H
H
H
H
L
L
L
L
L
L
L
= 100mV, R
or V
= 100mV, R
CC
supply
H
H
H
H
H
H
H
L
L
H
L
PULLUP
PULLUP
3DM* 3DM* 3DM* Off
SW
A/B
Off
Off
Off
Off
Off
On
On
On
On
On
Characteristics table to establish test conditions. Actual production test
conditions may be more stringent.
Note 3: The following inputs are high impedance CMOS inputs:
Note 4: The following inputs have built-in 2 A pull-up current sources
(passed through series diodes): BATSEL, BATDIS and CHGSEL.
Note 5: Gate turn-on and turn-off times are measured with no inrush
current limiting, i. e., V
application circuit.
= 51k
the system after abnormal operating conditions have been encountered.
See the Timing Diagram and Applications Information sections for
further details.
= 51k
3DM and DCIN/BAT and have no internal pull-up current.
SWITCH STATUS
C/D
SW
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
SW
E/F
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
SW
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
G
SENSE
SW
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
H
= 0V, using Si4936DY MOSFETs in the typical
CHGMON
BAT1
BAT2
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
MIN
BAT1
BAT1
BAT2
BAT2
BAT1
BAT2
BAT1
BAT1
BAT2
BAT1
BAT1
V
TYP
300
BAT
30
30
30
30
OUTPUTS
3
3
3
5
5
5
LOBAT DCINGOOD
H
H
H
H
H
H
L
L
L
L
L
MAX
H
H
H
H
H
H
L
L
L
L
L
UNITS
kHz
s
s
s
s
s
s
s
s
s
s