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PDF LT8490 Data sheet ( Hoja de datos )
| Número de pieza | LT8490 | |
| Descripción | Buck-Boost Battery Charge Controller | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT8490 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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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 VBAT
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
GATEVCC´
GATEVCC´
Maximum Power Point Tracking
FULL PANEL SCAN
VPANEL
6V/DIV
SOLAR PANEL
TG1 BOOST1 SW1 BG1 CSP CSN
BG2 SW2 BOOST2 TG2
CSNIN
CSPIN
VIN
GATEVCC´
GATEVCC
INTVCC
LT8490
CSPOUT
CSNOUT
EXTVCC
AVDD
TEMPSENSE
AVDD
STATUS
FAULT
AVDD
GND
LOAD
VBAT
+–
RECHARGABLE
BATTERY
THERMISTOR
IPANEL
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
1
1 page  
LT8490
Electrical Characteristics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Do not force voltage on the VC pin.
Note 3: The LT8490E is guaranteed to meet performance specifications from
0°C to 125°C junction temperature. Specifications over the –40°C to 125°C
operating junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LT8490I is guaranteed
over the full –40°C to 125°C junction temperature range.
Note 4: Do not apply a voltage or current source to these pins. They must
be connected to capacitive loads only, otherwise permanent damage may
occur.
Note 5: Negative voltages on the SW1 and SW2 pins are limited in the
applications by the body diodes of the external NMOS devices M2 and
M3 or parallel Schottky diodes when present. The SW1 and SW2 pins
are tolerant of these negative voltages in excess of one diode drop below
ground, guaranteed by design.
Note 6: These thresholds are measured by the internal A-D converter. The
A-D reference voltage is AVDD. AVDD, VDD and an additional 2.8mA load are
regulated by LDO33 to create the AVDD reference for these measurements.
The absolute threshold voltages will shift with corresponding changes in
the AVDD voltage.
Note 7: 10V minimum VIN required for solar powered start-up if low power
mode is enabled.
For more information www.linear.com/LT8490
8490f
5
5 Page 
Block Diagram
LT8490
13 CSP
12 CSN
9 MODE
2.5V
–
+A5
46 VIN
19 SS
UV_INTVCC OT OI_IN OI_OUT
START-UP AND
FAULT LOGIC
11 SHDN
21 SYNC
22 RT
20 CLKOUT
1.234V
–
+
UV_VIN UV_GATEVCC
UV_LDO33
OSC1
56 CLKDET
8 SWEN
49 SWENO
NC 36 SRVO_IIN
44 CSNIN
45 CSPIN
–
+A7
AVDD
ADC
10
10 IMONIN
–
+EA2
+ 1.208V
AVDD
53 IIR
ADC 10
54 VINR
AVDD
ADC
10
15 FBIN
1.205V
+
–EA3
– NC 35 SRVO_FBIN
1 FBIR
6 FBIW
AVDD
ADC
OSC2
10
AVDD
AVDD
3 TEMPSENSE
AVDD 61 CHARGECFG1
NTC 63 CHARGECFG2
AVDD
ADC
AVDD
ADC
AVDD
ADC
10
10
10
+
–A8
BUCK,BOOST
LOGIC
+
–A9
VIN
6.35V REG
INTERNAL
SUPPLY1
INTERNAL
SUPPLY2
REG
BOOST1 33
TG1 32
SW1 31
GATEVCC 24
BG1 23
BG2 25
SW2 29
TG2 28
BOOST2 27
VC 18
6.4V
6.35V REG
EXTVCC 40
305k
INTVCC 7
3.3V REG
LDO33 14
VDD 4
AVDD 58
SRVO_IOUT 37 NC
CONTROL,
CHARGING,
MPPT
LOGIC
PWM
PWM
EA1
1.208V
+
A6–
AVDD
10
ADC
EA4
AVDD
10
ADC
CSPOUT 42
CSNOUT 41
IMONOUT 17
IOW 50
IOR 64
FBOUT 16
1.207V
SRVO_FBOUT 38 NC
ECON 48
FBOW 5
FBOR 57
55 GND
AVDD
51 STATUS
2
FAULT
AVDD
8490 BD
+
–
Figure 1. Block Diagram
For more information www.linear.com/LT8490
8490f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT8490.PDF ] | |
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