|
|
PDF LT3651-4.1 Data sheet ( Hoja de datos )
| Número de pieza | LT3651-4.1 | |
| Descripción | (LT3651-4.1 / LT3651-4.2) Monolithic 4A High Voltage Li-Ion Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LT3651-4.1 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
|
No Preview Available !
FEATURES
n Wide Input Voltage Range: 4.8V to 32V
(40V Absolute Maximum)
n Programmable Charge Current Up to 4A
n Selectable C/10 or Onboard Timer Termination
n Dynamic Charge Rate Programming/Soft-Start
n Programmable Input Current Limit
n 0.5% Float Voltage Accuracy
n 7.5% Charge Current Accuracy
n 4% C/10 Detection Accuracy
n NTC Resistor Temperature Monitor
n Auto-Recharge at 97.5% Float Voltage
n Auto-Precondition <70% Float Voltage
n Bad Battery Detection with Auto-Reset
n Average Current Mode, Synchronous Switcher
n User Programmable Frequency
n Low Profile (0.75mm) 5mm × 6mm 36-Pin
QFN Package
APPLICATIONS
n Industrial Handheld Instruments
n 12V to 24V Automotive and Heavy Equipment
n Desktop Cradle Chargers
n Notebook Computers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LT3651-4.1/LT3651-4.2
Monolithic 4A High Voltage
1 Cell Li-Ion Battery Charger
DESCRIPTION
The LT®3651 is a 1 cell 4A Li-Ion/Polymer battery charger
that operates over a 4.8V to 32V input voltage range. An
efficient monolithic average current mode synchronous
switching regulator provides constant current, constant
voltage charging with programmable maximum charge
current. A charging cycle starts with battery insertion
or when the battery voltage drops 2.5% below the float
voltage. Charger termination is selectable as either charge
current or internal safety timer timeout. Charge current
termination occurs when the charge current falls to one-
tenth the programmed maximum current (C/10). Timer
based termination is typically set to three hours and is
user programmable (charging continues below C/10 until
timeout). Once charging is terminated, the LT3651 supply
current drops to 85µA into a standby mode.
The LT3651 offers several safety features. A discharged
battery is preconditioned with a small trickle charge and
generates a signal if unresponsive. A thermistor monitors
batteryhttp://www.DataSheet4U.net/ temperature, halting charging if out of range. Ex-
cessive die temperature reduces charge current. Charge
current is also reduced to maintain constant input current
to prevent excessive input loading.
The LT3651 is available in a 5mm × 6mm 36-pin QFN
package.
TYPICAL APPLICATION
VIN
6.5V TO
32V
Si7611DN
6.5V to 32V Single Cell 4A Charger
100k 10V
100k
301k
CLP CLN VIN
SHDN
SW
ACPR
FAULT
CHRG
BOOST
LT3651-4.2
SENSE
RT
TIMER
BAT
NTC
ILIM RNG/SS GND
TO
SYSTEM
22µF LOAD
1µF
1N5819
6.5µH
WÜRTH 744314650
24mΩ
100µF + BATTERY
365142 TA01a
Efficiency, Power Loss vs VIN
86
85 EFF
VBAT = 3.9
4.4
4.0
84 3.6
83 3.2
82 2.8
81
80
5
PLOSS
10 15 20
VIN (V)
2.4
2.0
25 30
365142 TA01b
365142fc
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
LT3651-4.1/LT3651-4.2
TYPICAL PERFORMANCE CHARACTERISTICS
Battery Float Voltage
vs Temperature
1.0
0.5
0
–0.5
–1.0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
365142 G01
Maximum Charge Current vs
VRNG/SS as a Percentage of
Programmed IMAX
120
100
80
60
40
20
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VRNG/SS (V)
365142 G04
Maximum Input Current vs VILIM
as a Percentage of Programmed
IIN(MAX)
120
100
80
60
40
20
0
0 0.2 0.4 0.6 0.8 1.0 1.2
VILIM (V)
365142 G07
VvsINTSemtapnedrbaytuMreode Current
100
95
90
85
80
75
70
65
60
55
50
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
365142 G02
IMAX Current Limit
(VSENSE – VBAT) vs Temperature
101.0
100.5
100.0
http://www.DataSheet4U.net/
99.5
99.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
365142 G05
Input Current Limit Voltage
Threshold vs Temperature
2.0
1.5
1.0 RILIM OPEN
0.5
0 RILIM = 10k
–0.5
–1.0
–1.5
–2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
365142 G08
SENSE and BAT Pin Current
vs BAT Voltage, VSENSE = VBAT
150
100 LT3651-4.2
ISENSE
50 IBAT
0
–50
–100
–150
–200
–250
–300
–350
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VBAT (V)
365142 G03
Thermal Foldback–Charge Current
vs Temperature as a Percentage
of Programmed ICHG(MAX)
120
100
80
60
40
20
0
100
110 120 130
TEMPERATURE (°C)
140
365142 G06
Charge Current vs VBAT as a
Percentage of Programmed
ICHG(MAX)
120 LT3651-4.2
100
80
60
40
20
0
2.5
3.0 3.5
VBAT (V)
4.0 4.5
365142 G09
365142fc
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
LT3651-4.1/LT3651-4.2
OPERATION
setting the maximum charge current. Manipulation of
maximum charge current is possible through the RNG/SS
and ILIM pins (see the RNG/SS: Dynamic Charge Current
Adjust, RNG/SS: Soft-Start and ILIM Control sections).
If the voltage on the BAT pin (VBAT) is below VBAT(PRE),
A7 initiates the precondition mode. During the pre-
condition interval, the charger continues to operate in
constant current mode, but the ITH clamp is reduced to
0.15V reducing charge current to 15% of the maximum
programmed value.
As VBAT approaches the float voltage (VFLOAT) the voltage
error amp V-EA takes control of ITH and the charger transi-
tions into constant voltage (CV) mode. As this occurs, the
ITH voltage falls from the limit clamp and charge current is
reduced from the maximum value. When the ITH voltage
falls below 0.1V, A8 signals C/10. If the charger is config-
ured for C/10 termination the charge cycle is terminated.
Once the charge cycle is terminated, the CHRG status
pin becomes high impedance and the charger enters low
current standby mode.
The LT3651 contains an internal charge cycle timer that
terminates a successful charge cycle after a programmed
amount of time. This timer is typically programmed to
achieve end-of-cycle in three hours, but can be configured
for any amount of time by setting an appropriate timing
capacitor value (CTIMER). When timer termination is used,
the charge cycle does not terminate after C/10 is achieved.
Because the CHRG status pin responds to the C/10 current
level, the IC will indicate a fully charged battery status,
but the charger will continue to source low currents. At
the programmed end of the cycle time the charge cycle
stops and the part enters standby mode. If the battery
did not achieve at least 97.5% of the full float voltage at
the end-of-cycle, charging is deemed unsuccessful and
another full-timer cycle is initiated.
Use of the timer function also enables bad battery detec-
tion. This fault condition is achieved if the battery does
not respond to preconditioning and the charger remains
in (or enters) precondition mode after one-eighth of the
programmed charge cycle time. A bad battery fault halts
the charging cycle, the CHRG status pin goes high imped-
ance and the FAULT pin is pulled low.
When the LT3651 terminates a charging cycle, whether
through C/10 detection or by reaching timer end-of-cycle,
the average current mode analog loop remains active but
the internal float voltage reference is reduced by 2.5%.
Because the voltage on a successfully charged battery is
at the full float voltage, the voltage error amp detects an
overvoltage condition and rails low. When the voltage error
amp output drops below 0.3V, the IC enters standby mode,
where most of the internal circuitry is disabled and the
VIN bias current is reduced to <100µA. When the voltage
on the BAT pin drops below the reduced float reference
level, the output of the voltage error amp will climb, at
which point the IC comes out of standby mode and a new
charging cycle is initiated.
The system current limit allows charge current to be
reduced in order to maintain a constant input current.
http://www.DataSheet4U.net/
Input current is measured via a resistor (RCL) that is
placed between the CLP and CLN pins. Power is applied
through this resistor and is used to supply both VIN of the
chip and other system loads. An offset produced on the
inputs of A12 sets the threshold. When that threshold is
achieved, ITH is reduced, lowering the charge current thus
maintaining the maximum input current.
50µA of current is sourced from ILIM to a resistor (RILIM)
that is placed from that pin to ground. The voltage on ILIM
determines the regulating voltage across RCL. 1V on ILIM
corresponds to 95mV across RCL. The ILIM pin clamps
internally to 1V maximum.
If the junction temperature of the die becomes excessive,
A10 activates decreasing ITH and reduces charge current.
This reduces on-chip power dissipation to safe levels but
continues charging.
365142fc
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LT3651-4.1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LT3651-4.1 | (LT3651-4.1 / LT3651-4.2) Monolithic 4A High Voltage Li-Ion Battery Charger | Linear |
| LT3651-4.2 | Monolithic 4A High Voltage Li-Ion Battery Charger |  Linear Technology Corporation |
| LT3651-4.2 | (LT3651-4.1 / LT3651-4.2) Monolithic 4A High Voltage Li-Ion Battery Charger | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |