LT8490_15 Datasheet, PDF (1/42 Pages) Linear Technology – High Voltage, High Current Buck-Boost Battery Charge Controller with Maximum Power Point Tracking

LT8490
Features
High Voltage, High Current
Buck-Boost Battery Charge Controller with
Maximum Power Point Tracking (MPPT)
Description
n _{VIN Range: 6V to 80V}
n _{VBAT Range: 1.3V to 80V}
n _{Single Inductor Allows VIN Above, Below, or Equal}
to V_BAT
n _{Automatic MPPT for Solar Powered Charging}
n _{Automatic Temperature Compensation}
n _{No Software or Firmware Development Required}
n _{Operation from Solar Panel or DC Supply}
n _{Input and Output Current Monitor Pins}
n _{Four Integrated Feedback Loops}
n _{Synchronizable Fixed Frequency: 100kHz to 400kHz}
n _{64-Lead (7mm × 11mm × 0.75mm) QFN Package}
Applications
n _{Solar Powered Battery Chargers}
n _{Multiple Types of Lead-Acid Battery Charging}
n _{Li-Ion Battery Charger}
n _{Battery Equipped Industrial or Portable Military}
Equipment
The LT^®8490 is a buck-boost switching regulator battery
charger that implements a constant-current constant-
voltage (CCCV) charging profile used for most battery
types, including sealed lead-acid (SLA), flooded, gel and
lithium-ion. The device operates from input voltages
above, below or equal to the output voltage and can be
powered by a solar panel or a DC power supply. On-chip
logic provides automatic maximum power point tracking
(MPPT) for solar powered applications. The LT8490 can
perform automatic temperature compensation by sensing
an external thermistor thermally coupled to the battery.
STATUS and FAULT pins containing charger information
can be used to drive LED indicator lamps. The device is
available in a low profile (0.75mm) 7mm × 11mm 64-lead
QFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
Typical Application
Simplified Solar Powered Battery Charger Schematic
GATEV_CC´
GATEV_CC´
SOLAR PANEL
TG1 BOOST1 SW1 BG1 CSP CSN
BG2 SW2 BOOST2 TG2
CSNIN
CSPIN
V_IN
GATEV_CC´
GATEV_CC
INTV_CC
LT8490
CSPOUT
CSNOUT
EXTV_CC
AV_DD
TEMPSENSE
STATUS FAULT
GND
AV_DD
AV_DD
LOAD
V_BAT
+
–
RECHARGABLE
BATTERY
THERMISTOR
Maximum Power Point Tracking
FULL PANEL SCAN
V_PANEL
6V/DIV
I_PANEL
1.36A/DIV
PERTURB &
OBSERVE
PERTURB &
OBSERVE
0.5s/DIV
BACK PAGE APPLICATION
8490 TA01b
8490 TA01a
For more information www.linear.com/LT8490
8490f
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