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PDF LTC4060 Data sheet ( Hoja de datos )
| Número de pieza | LTC4060 | |
| Descripción | Standalone Linear NiMH/NiCd Fast Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4060
Standalone Linear NiMH/NiCd
Fast Battery Charger
FEATURES
■ Complete Fast Charger Controller for Single,
2-, 3- or 4-Series Cell NiMH/NiCd Batteries
■ No Firmware or Microcontroller Required
■ Termination by –∆V, Maximum Voltage or
Maximum Time
■ No Sense Resistor or Blocking Diode Required
■ Automatic Recharge Keeps Batteries Charged
■ Programmable Fast Charge Current: 0.4A to 2A
■ Accurate Charge Current: ±5% at 2A
■ Fast Charge Current Programmable Beyond 2A with
External Sense Resistor
■ Automatic Detection of Battery
■ Precharge for Heavily Discharged Batteries
■ Optional Temperature Qualified Charging
■ Charge and AC Present Status Outputs Can Drive LED
■ Automatic Sleep Mode with Input Supply Removal
■ Negligible Battery Drain in Sleep Mode: <1µA
■ Manual Shutdown
■ Input Supply Range: 4.5V to 10V
■ Available in 16-Lead DFN and TSSOP Packages
U
APPLICATIO S
■ Portable Computers, Cellular Phones and PDAs
■ Medical Equipment
■ Charging Docks and Cradles
■ Portable Consumer Electronics
DESCRIPTIO
The LTC®4060 is a complete fast charging system for NiMH
or NiCd batteries. Just a few external components are
needed to design a standalone linear charging system.
An external PNP transistor provides charge current that is
user programmable with a resistor. A small external capaci-
tor sets the maximum charge time. No external current
sense resistor is needed, and no blocking diode is required.
The IC automatically senses the DC input supply and bat-
tery insertion or removal. Heavily discharged batteries are
initially charged at a C/5 rate before a fast charge is applied.
Fast charge is terminated using the –∆V detection method.
Backup termination consists of a programmable timer and
battery overvoltage detector. An optional external NTC ther-
mistor can be used for temperature-based qualification of
charging. An optional programmable recharge feature au-
tomatically recharges batteries after discharge.
Manual shutdown is accomplished with the SHDN pin, while
removing input power automatically puts the LTC4060 into
sleep mode. During shutdown or sleep mode, battery drain
is <1µA.
The LTC4060 is available in both low profile (0.75mm) 16-
pin 5mm × 3mm DFN and 16-lead TSSOP packages. Both
feature exposed metal die mount pads for optimum ther-
mal performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
2-Cell, 2A Standalone NiMH Fast Charger with
Optional Thermistor and Charge Indicator
VIN = 5V
330Ω
“CHARGE”
NTC
698Ω
VCC
SHDN ACP
CHRG SENSE
NTC DRIVE
LTC4060
PROG BAT
ARCT TIMER
SEL0 CHEM
SEL1 PAUSE
GND
+
NiMH
BATTERY
1.5nF
4060 TA01
2-Cell NiMH Charging Profile
3.40
–∆V
TERMINATION
3.30
3.20
3.10
0
10 20 30 40 50
CHARGE TIME (MINUTES)
60
4060 TA01b
4060f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
NiMH Battery Charging
Characteristics at 1C Rate
1.70
TA = 25°C
–∆V TERMINATION
1.65
NiCd Battery Charging
Characteristics at 1C Rate
1.7
TA = 25°C
–∆V TERMINATION
1.6
1.60 1.5
1.55
0
10 20 30 40 50
CHARGE TIME (MINUTES)
60
4060 G01
NiCd Battery Charging
Characteristics at C/2 Rate
1.65
1.4
0
10 20 30 40 50
CHARGE TIME (MINUTES)
60
4060 G02
IFCH vs Temperature and
Supply Voltage
2.010
1.60
–∆V TERMINATION
1.55
1.50
1.45
2.005
2.000
1.995
VCC = 10V
VCC = 4.5V
1.40
0
20 40 60 80 100 120 140
CHARGE TIME (MINUTES)
4060 G04
IBRD vs Temperature and
Supply Voltage
–260
VCC = 10V
–300
VCC = 4.5V
–340
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4060 G07
1.990
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4060 G05
VMDV vs Temperature and
Supply Voltage
18
16
NiCd
14 4.5V ≤ VCC ≤ 10V
12
10 NiMH
4.5V ≤ VCC ≤ 10V
8
6
4
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4060 G08
LTC4060
NiMH Battery Charging
Characteristics at C/2 Rate
1.60
TA = 25°C
–∆V TERMINATION
1.55
1.50
1.45
1.40
1.35
0
20 40 60 80 100 120 140
CHARGE TIME (MINUTES)
4060 G03
IFCL vs Temperature and
Supply Voltage
402
401
VCC = 10V
400
VCC = 4.5V
399
398
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4060 G06
tACC vs Temperature and
Supply Voltage
1.7
1.5
VCC = 10V
1.0
0.5
VCC = 4.5V
0
–0.5
–1.0
–1.5
–50
RPROG = 3480Ω
CTIMER = 470pF
RPROG = 698Ω
CTIMER = 1.2nF
–25 0 25 50 75
TEMPERATURE (°C)
100 125
4060 G09
4060f
5
5 Page 
U
OPERATIO
charging begins at the maximum current set by the
external programming resistor connected between the
PROG pin and GND.
If an external thermistor indicates sensed temperature is
beyond a range of 5°C to 55°C charging is suspended, the
charge timer is paused and the CHRG status output
remains low. Normal charging resumes from the previous
state when the sensed temperature rises above 5°C or falls
below 45°C. Voltage-based termination (–∆V) is then
reset and immediately enabled. If voltage-based termina-
tion was imminent when the temperature limits were
exceeded, charge termination will occur.
Charge Termination
Once fast charge begins and after an initial battery voltage
stabilization hold-off period shown in Table 1, voltage-
based termination (–∆V) is enabled. This period is used to
prevent falsely terminating on a –∆V event that can occur
almost immediately after initiating charging on some
heavily discharged or stored batteries. However, if VCELL
was measured to be above 1.3V (VIDT) immediately prior
to the precharge cycle, then a mostly charged battery is
assumed and voltage-based termination (–∆V) is enabled
without delay.
An internal 1.5mV resolution A/D converter measures the
cell voltage after each battery voltage sampling interval
indicated in Table 1. The peak cell voltage is stored and
compared to the current cell voltage. When the cell voltage
has dropped by at least VMDV (magnitude selected by the
CHEM pin) from the peak for four consecutive battery
voltage sampling intervals, charging is terminated.
Back-up termination is provided by the charge time limiter,
whose time limit is indicated in Table 1, and by a battery
overvoltage detector. Once terminated by back-up termi-
nation, charge qualification can be reinitiated only by remov-
ing and replacing the battery or toggling the SHDN pin low
to high or removing and reapplying power to the charger.
Automatic Recharge
Once charging is complete, the optional programmable
automatic recharge state can be entered. This state, if
LTC4060
enabled, will automatically restart the charger from the
charge qualification state without user intervention when-
ever the battery cell voltage drops below a set level. With
the advent of low memory effect NiMH and improved NiCd
cells an automatic recharge feature is practical and elimi-
nates the need for very slow trickle charging.
The CHRG status output is high impedance in the auto-
matic recharge state until charging begins. If the VCELL
voltage drops below the voltage set on the ARCT pin for at
least the automatic recharge entry delay time as shown in
Table 1, the charge qualification state is entered and
charging will begin anew in fast charge. An easy way of
setting the voltage on the ARCT pin is by using two series
current programming resistors and connecting their com-
mon to the ARCT pin as shown in Figure 2. The PROG pin
will provide a constant 1.5V (VPROG). The programmable
voltage range of the ARCT pin is approximately 0.8V to
1.6V. A preprogrammed recharge threshold of 1.3V (VARDT)
is selected when the ARCT pin is connected to VCC
(VARDEF). Automatic recharge is disabled when the ARCT
pin is connected to ground (VARDIS).
Pause
After charging is initiated, the PAUSE pin may be used to
pause operation at any time. Whenever the voltage on the
PAUSE pin is a logic high, the charge timer and all other
timers pause, charging is stopped and the fast charge ter-
mination algorithm is inhibited. The CHRG status output
remains at GND. If voltage-based termination was immi-
nent before pause, charge termination will occur. Otherwise,
when pause ends, the charge timer and all other timers
resume timing, charging restarts and voltage-based termi-
nation (–∆V) is reset and immediately enabled. If the bat-
tery is removed while the PAUSE pin is a logic high, then
battery removal is detected and shutdown is entered. If the
battery is replaced while the PAUSE pin is a logic high, it
will not be detected until pause is turned off.
For pause periods or a series of periods where the battery
capacity could be significantly depleted, consider using
shutdown instead of pause to avoid having the safety timer
expire before the battery can be fully charged. Shutdown
resets the safety timer.
4060f
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4060.PDF ] | |
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