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LTM8061 Schematic ( PDF Datasheet ) - Linear Technology

Teilenummer LTM8061
Beschreibung uModule Li-Ion / Polymer Battery Charger
Hersteller Linear Technology
Logo Linear Technology Logo 




Gesamt 22 Seiten
LTM8061 Datasheet, Funktion
Features
n Wide Input Voltage Range: 4.95V to 32V
(40V Absolute Maximum)
n Float Voltage Options:
1-Cell: 4.1V, 4.2V
2-Cell: 8.2V, 8.4V
n Programmable Charge Current: Up to 2A
n User-Selectable Charge Termination: C/10 or
Onboard Termination Timer
n Dynamic Charge Rate Programming/Soft-Start Pin
n Programmable Input Current Limit
n Optional Reverse Input Protection
n NTC Resistor Temperature Monitor
n 0.5% Float Voltage Accuracy
n Bad-Battery Detection with Auto-Reset
n Tiny, Low Profile (9mm × 15mm × 4.32mm) Surface
Mount LGA Package
Applications
n Industrial Handheld Instruments
n 12V to 24V Automotive and Heavy Equipment
n Professional Video/Camera Chargers
L, LT, LTC, LTM, Linear Technology, Linear logo, µModule and PolyPhase are registered
trademarks and PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners
LTM8061
32V, 2A µModule Li-Ion/
Polymer Battery Charger
Description
The LTM®8061 is a high efficiency 32V, 2A µModule®
standalone Li-Ion battery charger. It is optimized for
one and two-cell packs, with fixed float voltage options:
4.1V, 4.2V, 8.2V and 8.4V. The LTM8061 provides a
constant-current/constant-voltage charge characteristic,
with maximum charge current up to 2A. A precondition
feature trickle charges a depleted battery, and bad battery
detection provides a signal and suspends charging if a
battery does not respond to preconditioning.
The LTM8061 can be configured to terminate charging
when charge current falls to one-tenth the programmed
maximum current or to use an internal timer if a time-
based termination scheme is desired. Once charging is
terminated, the LTM8061 enters a low current standby
mode. An auto-restart feature starts a new charge cycle
if the battery voltage drops 2.5% from the float voltage,
or if a new battery is inserted into a charging system.
The LTM8061 is packaged in a thermally enhanced, com-
pact (9mm × 15mm × 4.32mm) over-molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8061 is
RoHS compliant.
Typical Application
Standalone Single Cell 2A Li-Ion Battery Charger
with C/10 Termination from 6V to 32V Input
VIN
6V TO 32V
4.7µF
LTM8061-4.1
VINA BAT
VINC/CLP
BIAS
VIN
RUN
RNG/SS
CHRG
TMR FAULT
NTC
GND
8061 TA01a
+ SINGLE
CELL
4.1V
BATTERY
AVAILABLE OPTIONS:
1-CELL: 4.1V, 4.2V
2-CELL: 8.2V, 8.4V
Battery Charging Profile
2500
2000
NORMAL CHARGING
1500
1000
500
0
0
PRECONDITION
TERMINATION
123
BATTERY VOLTAGE (V)
4
8061 TA01b
For more information www.linear.com/LTM8601
8061fa
1






LTM8061 Datasheet, Funktion
LTM8061
Typical Performance Characteristics
Input Standby Current
vs Temperature, 4.2VBAT
7
6
5
VINA = 12V
4
VINA = 24V
3
2
1
0
–50
0 50
TEMPERATURE (°C)
100
8061 G16
Input Standby Current
vs Temperature, 8.2VBAT
9
8
7
6 VINA = 12V
5
4 VINA = 24V
3
2
1
0
–50
0 50
TEMPERATURE (°C)
100
8061 G17
Input Standby Current
vs Temperature, 8.4VBAT
10
9
8
7
6 VINA = 12V
5
4 VINA = 24V
3
2
1
0
–50
0 50
TEMPERATURE (°C)
100
8061 G18
6
Temperature Rise vs IBAT, 4.1VBAT
30
25
VINA = 24V
20
15
10
VINA = 12V
5
0
0
500
1000
1500
2000
IBAT (mA)
8061 G19
Temperature Rise vs IBAT, 8.2VBAT
35
30
VINA = 12V
25
20 VINA = 24V
15
10
5
0
0
500
1000
1500
2000
IBAT (mA)
8061 G21
Temperature Rise vs IBAT, 4.2VBAT
30
25
20
VINA = 24V
15
10
VINA = 12V
5
0
0
500
1000
1500
2000
IBAT (mA)
8061 G20
Temperature Rise vs IBAT, 8.4VBAT
40
35
30
VINA = 12V
25
VINA = 24V
20
15
10
5
0
0
500
1000
1500
2000
IBAT (mA)
8061 G22
For more information www.linear.com/LTM8601
8061fa

6 Page









LTM8061 pdf, datenblatt
LTM8061
Applications Information
VIN Input Supply
The LTM8061 is biased directly from the charger input
supply through the VIN pin. This pin carries large switched
currents, so a high quality, low ESR decoupling capacitor
is recommended to minimize voltage glitches on VIN. A
4.7µF capacitor is typically adequate for most charger
applications.
Reverse Protection Diode
The LTM8061 integrates a high voltage power Schottky
diode to provide input reverse voltage protection. The
anode of this diode is connected to VINA, and the cath-
ode is connected to VINC/CLP. There is a small amount of
capacitance at each end; please see the Block Diagram.
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the internal
power switching stage and operate other internal circuitry.
For proper operation, it must be powered by at least 2.9V
and no more than the absolute maximum rating of 10V.
In most applications, connect BIAS to BAT.
When charging a 2-cell battery using a relatively high input
voltage, the LTM8061 power dissipation can be reduced
by connecting BIAS to a 3.3V source.
BAT Decoupling Capacitance
In many applications, the internal BAT capacitance of the
LTM8061is sufficientfor properoperation.Thereare cases,
however, where it may be necessary to add capacitance or
otherwise modify the output impedance of the LTM8061.
Case 1: the µModule charger is physically located far from
the battery and the added line impedance may interfere with
the control loop. Case 2: the battery ESR is very small or
very large; the LTM8061 controller is designed for a wide
range, but some battery packs have an ESR outside of this
range. Case 3: there is no battery at all. As the charger is
designed to work with the ESR of the battery, the output
may oscillate if no battery is present.
The optimum ESR is about 100mΩ, but ESR values both
higher and lower will work. Table 1 shows a sample of
parts verified by Linear Technology:
Table 1. Recommended BAT Capacitors
PART NUMBER
DESCRIPTION
16TQC22M
22µF, 16V, POSCAP
35SVPD18M
18µF, 35V, OS-CON
TPSD226M025R0100
22µF, 25V Tantalum
T495D226K025AS
22µF, 25V, Tantalum
TPSC686M006R0150
68µF, 6V, Tantalum
TPSB476M006R0250
47µF, 6V, Tantalum
APXE100ARA680ME61G 68µF, 10V Aluminum
APS-150ELL680MHB5S 68µF, 25V Aluminum
MANUFACTURER
Sanyo
Sanyo
AVX
Kemet
AVX
AVX
Nippon Chemicon
Nippon Chemicon
If system constraints preclude the use of electrolytic ca-
pacitors, a series R-C network may be used. Use a ceramic
capacitor of at least 22µF and an equivalent resistance of
100mΩ.
CLP: Input Current Limit
The LTM8061 contains a PowerPath™ control feature to
support multiple load systems. The charger adjusts charge
current in response to a system load if input supply current
exceeds the programmed maximum value. Maximum input
supply current is set by connecting a sense resistor (RCLP)
as shown in Figure 3. The LTM8061 begins to limit the
charge current when the voltage across the sense resistor
is 50mV. The maximum input current is defined by:
RCLP = 0.05/(Max Input Current)
INPUT SUPPLY
RCLP
SYSTEM LOAD
LTM8061
VIN
VINC /CLP
8061 F03
Figure 3. RCLP Sets the Input Supply Current Limit
12
For more information www.linear.com/LTM8601
8061fa

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