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PDF LTM8062A Data sheet ( Hoja de datos )
| Número de pieza | LTM8062A | |
| Descripción | uModule Power Tracking Battery Chargers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8062A (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Features
n Complete Battery Charger System
n Input Supply Voltage Regulation Loop for Peak
Power Tracking in MPPT (Maximum Peak Power
Tracking) Solar Applications
n Resistor Programmable Float Voltage Up to 14.4V
on the LTM8062 and 18.8V on the LTM8062A
n Wide Input Voltage Range: 4.95V to 32V
(40V Abs Max)
n 2A Charge Current
n Accommodates Li-Ion/Polymer, LiFePO4, SLA
n Integrated Input Reverse Voltage Protection
n User Selectable Termination: C/10 or Termination
Timer
n 0.75% Float Voltage Reference Accuracy
n 9mm × 15mm × 4.32mm LGA Package
Applications
n Industrial Handheld Instruments
n 12V to 24V Automotive and Heavy Equipment
n Desktop Cradle Chargers
n Solar Power Battery Charging
LTM8062/LTM8062A
32VIN, 2A µModule Power
Tracking Battery Chargers
Description
The LTM®8062/LTM8062A are complete 32VIN, 2A
µModule® power tracking battery chargers. The LTM8062/
LTM8062A provide a constant-current/constant-voltage
charge characteristic, a 2A maximum charge current, and
employ a 3.3V float voltage feedback reference, so any
desired battery float voltage up to 14.4V for the LTM8062
and up to 18.8V for the LTM8062A can be programmed
with a resistor divider.
The LTM8062/LTM8062A employ an input voltage regula-
tion loop, which reduces charge current if the input volt-
age falls below a programmed level, set with a resistor
divider. When the LTM8062/LTM8062A are powered by a
solar panel, this input regulation loop is used to maintain
the panel at peak output power. The LTM8062/LTM8062A
also feature preconditioning trickle charge, bad battery
detection, a choice of termination schemes and automatic
restart.
The LTM8062/LTM8062A are packaged in a thermally en-
hanced, compact (9mm × 15mm ×4.32mm) over-molded
land grid array (LGA) package suitable for automated
assembly by standard surface mount equipment. The
LTM8062/LTM8062A are RoHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
2A LiFePO4 µModule Battery Charger
VIN
6V TO 32V
4.7µF
VINA LTM8062 BAT
VIN BIAS
VINREG
CHRG
RUN FAULT
TMR ADJ
NTC
GND
8062 TA01a
274k
2.87M
1-CELL
LiFePO4
(3.6V)
Charge Current vs Battery Voltage
2500
2000
NORMAL CHARGING
1500
1000
500
0
0
PRECONDITION
TERMINATION
123
BATTERY VOLTAGE (V)
4
8062 TA01b
For more information www.linear.com/LTM8062
8062fd
1
1 page  
LTM8062/LTM8062A
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
IBIAS vs IBAT, 14.4V Float
45
40
35
30 VINA = 24V
25
20
15
10
5
0
0
500
1000
1500
IBAT (mA)
2000
8062 G09
IBIAS vs IBAT, 18.8V Float
50
45
VINA = 24V
40
35
30
25
20
15
10
5
0
0
500
1000
1500
IBAT (mA)
2000
8062 G24
Input Current vs IBAT, 4.2V Float
900
800
700
600 VINA = 12V
500
400
300
200 VINA = 24V
100
0
0
500
1000
1500
2000
IBAT (mA)
8062 G10
Input Current vs IBAT, 7.2V Float
1400
1200
1000
VINA = 12V
800
600
400
VINA = 24V
200
0
0
500
1000
1500
2000
IBAT (mA)
8062 G11
Input Current vs IBAT, 8.4V Float
1600
1400
1200
VINA = 12V
1000
800
600
VINA = 24V
400
200
0
0 500 1000 1500 2000 2500
IBAT (mA)
8062 G12
Input Current vs IBAT, 14.4V Float
1400
1200
1000
800
VINA = 24V
600
400
200
0
0
500
1000
1500
2000
IBAT (mA)
8062 G13
Input Current vs IBAT, 18.8V Float
1600
VINA = 24V
1400
1200
1000
800
600
400
200
0
0
500
1000
1500
2000
IBAT (mA)
8062 G25
IQ vs VINA, RUN = 0V, VINREG Open
250
200
150
100
50
0
0 10 20 30 40
VINA (V)
8062 G14
For more information www.linear.com/LTM8062
Maximum IBAT vs ADJ
2500
2000
1500
1000
500
0
0 0.5 1 1.5 2 2.5 3 3.5
ADJ VOLTAGE (V)
8062 G15
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5 Page 
LTM8062/LTM8062A
Applications Information
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1 and find the row that has the desired
input voltage range and battery float voltage.
2. Apply the recommended CIN and RADJ values.
3. Connect BIAS as indicated.
While these component combinations have been tested
for proper operation, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions. Bear in mind that the
maximum output current is limited by junction tempera-
ture, the relationship between the input and output voltage
magnitude and polarity and other factors. Please refer to
the graphs in the Typical Performance Characteristics
section for guidance.
Table 1. Recommended Component Values and Configuration
(TA = 25°C)
RADJ1 RADJ2
TOP BOTTOM
VIN RANGE (V)* VBAT (V)
CIN
(kΩ) (kΩ)
6 to 32
3.6 4.7µF 1206 X7R 50V 274 2870
6 to 32
4.1 4.7µF 1206 X7R 50V 312 1260
6 to 32
4.2 4.7µF 1206 X7R 50V 320 1150
6.25 to 32
4.7 4.7µF 1206 X7R 50V 357
835
9.5 to 32
7.05 4.7µF 1206 X7R 50V 530
464
9.75 to 32
7.2 4.7µF 1206 X7R 50V 549
459
11 to 32
8.2 4.7µF 1206 X7R 50V 626
417
11.5 to 32
8.4 4.7µF 1206 X7R 50V 642
412
12.75 to 32
9.4 4.7µF 1206 X7R 50V 715
383
16.5 to 32
12.3 4.7µF 1206 X7R 50V 942
344
17 to 32
12.6 4.7µF 1206 X7R 50V 965
340
18.25 to 32
13.5 4.7µF 1206 X7R 50V 1020 328
19 to 32
14.08 4.7µF 1206 X7R 50V 1090 332
19.5 to 32
14.42 4.7µF 1206 X7R 50V 1110 328
23 to 32
16.4 4.7µF 1206 X7R 50V 1240 312
23.5 to 32
16.8 4.7µF 1206 X7R 50V 1270 309
26 to 32
18.8 4.7µF 1206 X7R 50V 1420 301
c*aOppaecriatatinncgeriasnrgeeq,uVirINedm. ust be 3.3V above VBAT to start. Input bulk
VIN Input Supply
The LTM8062/LTM8062A are biased directly from the
charger input supply through the VIN pin. This pin pro-
vides large switched currents, so a high quality low ESR
decoupling capacitor is recommended to minimize volt-
age glitches on VIN. 4.7μF is typically adequate for most
charger applications.
Reverse Protection Diode
The LTM8062/LTM8062A integrate a high voltage power
Schottky diode to provide input reverse voltage protec-
tion. The anode of this diode is connected to VINA, and
the cathode is connected to VIN. There is a small amount
of capacitance at each end; please see the Block Diagram.
The integrated diode can also be used to block battery
discharge leakage paths. The LTM8062/LTM8062A switch
and drive circuitry are designed to stand off some reverse
voltage from BAT to VIN, but leakage paths exist that can
put a small load on the battery if VIN falls below BAT.
Specifically, the RUN pin has a small bias current and
there is a 100k resistor tied to VINREG to GND. If either
of these pins is connected to VIN when it is below BAT,
it can present a small but finite discharge current to the
battery. This discharge current may be blocked by the
integrated Schottky diode if the RUN and VINREG circuits
are tied to VINA.
Input Supply Voltage Regulation
The LTM8062/LTM8062A contain a voltage monitor pin
that enables programming a minimum operational volt-
age. There is a 1% 100k resistor from VINREG to GND.
Connecting a resistor from VIN to the VINREG pin enables
programming of minimum input supply voltage, typically
used to program the peak power voltage for a solar panel.
Maximum charge current is reduced when the VINREG pin
is below the regulation threshold of 2.7V.
If the VINREG function is not used, and if the input supply
cannot provide enough power to satisfy the requirements
of an LTM8062/LTM8062A charger, the input supply voltage
For more information www.linear.com/LTM8062
8062fd
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM8062A.PDF ] | |
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