LTC4015_15 Datasheet, PDF (23/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Operation
effect when the input voltage drops below approximately
1V. Upon return of the input voltage above approximately
1V the LTC4015 wakes from ship mode and all registers
reset to their initial default values. The decision to remain
out of ship mode is latched once the voltage reference is
re-biased and INTV_CC is detected as having reached about
4.3V. Upon exiting ship mode, all internal registers are
reset to their default values.
If the application requires that power be cut off from
downstream system circuitry in SHIP MODE, a second
external PMOS can optionally be added as shown in
Figure 2. Unlike normal battery only mode, in ship mode
the SYSM5 pin is driven to the SYS voltage to disable
conduction through the second PMOS. This action cuts
off power to the downstream system, thus minimizing
battery drain between product manufacture and sale. If
the application does not require the battery to be isolated
from downstream devices, significant power savings in
the LTC4015 may still be realized by activating ship mode
without the second PMOS.
R_SNS1
V_IN
OPTIONAL PMOS ADDED
TO CUT OFF SYSTEM
LOAD IN SHIP MODE
SYSTEM
µCONTROLLER
CHEMISTRY/
CELL COURT
SELECTION
LEAD-ACID
EQUALIZE
CHARGE
V_IN ^{INFET CLP}
UVCLFB
SMBALERT
CLN SYS SYSM5 _OUTFET
INTV_CC
DRV_CC
DV_CC
SCL
SDA
BOOST
TG
CELLS0
CELLS1
CELLS2
CHEM0
LTC4015
SW
BG
2P5V_CC
CHEM1
CSPM5
RT
CSP
V_C
CCREFP
CSN
CCREFM
EQ
SGND
(PADDLE)
GND
BATSENS
NTCBIAS
MPPT ^NTC
MPPT
ENABLE
R_SNSB
R_NTCBIAS
BATTERY
PACK
T R_NTC
4015 F02
Figure 2. Typical Application with Optional PMOS Added for SHIP MODE Cutoff
For more information www.linear.com/LTC4015
4015f
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