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PDF LTC4010 Data sheet ( Hoja de datos )
| Número de pieza | LTC4010 | |
| Descripción | High Efficiency Standalone Nickel Battery Charger | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC4010
High Efficiency Standalone
Nickel Battery Charger
Features
n Complete NiMH/NiCd Charger for 1 to 16 Cells
n No Microcontroller or Firmware Required
n 550kHz PWM Current Source Controller
n No Audible Noise with Ceramic Capacitors
n Wide Input Voltage Range: 5.5V to 34V
n Programmable Charge Current: 5% Accuracy
n Automatic Trickle Precharge
n –∆V Fast Charge Termination
n Optional ∆T/∆t Fast Charge Termination
n Optional Temperature Qualification
n Automatic NiMH Top-Off Charge
n Programmable Timer
n Automatic Recharge
n Multiple Status Outputs
n Micropower Shutdown
n 16-Lead Thermally Enhanced TSSOP Package
Applications
n Integrated or Standalone Battery Charger
n Portable Instruments or Consumer Products
n Battery-Powered Diagnostics and Control
n Back-Up Battery Management
Description
The LTC®4010 provides a complete, cost-effective nickel
battery fast charge solution in a small package using few
external components. A 550kHz PWM current source
controller and all necessary charge initiation, monitoring
and termination control circuitry are included.
The LTC4010 automatically senses the presence of a DC
adapter and battery insertion or removal. When an external
DC source is not present, the LTC4010 enters shutdown
and supply current drawn from an installed battery drops
to the lowest possible level. Heavily discharged batteries
are precharged with a trickle current. The LTC4010 can
simultaneously use both –∆V and ∆T/∆t fast charge ter-
mination techniques and can detect various battery faults.
If necessary, a top-off charge is automatically applied to
NiMH batteries after fast charging is completed. The IC
will also resume charging if the battery self-discharges
after a full charge cycle.
All LTC4010 charging operations are qualified by actual
charge time and maximum average cell voltage. Charging
may also be gated by minimum and maximum temperature
limits. NiMH or NiCd fast charge termination parameters
are pin selectable.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
FROM
ADAPTER
9V
2A NiMH Battery Charger
3k 10µF LTC4010
VCC
FAULT TGATE
CHRG
READY
BGATE
TIMER PGND
49.9k
GND
CHEM
SENSE
BAT
VCDIV
VCELL
10k
10k 10µF
33nF
0.1µF INTVDD VTEMP
68nF
TO
SYSTEM
LOAD
47µH
0.05Ω
2-CELL
NiMH PACK
WITH 10k NTC
4010 TA01a
2A NiMH Charge Cycle at 1C
1.60 42
1.55 40
1.50
SINGLE CELL
1.45 VOLTAGE
38
36
1.40
1.35
1.30
1.25
0
BATTERY
TEMPERATURE
34
CHARGE
CURRRENT
2A
1A
TOP OFF
32
30
28
20 40 60 80 100
TIME (MINUTES)
4010 TA01b
4010fb
1 page  
Typical Performance Characteristics
LTC4010
NiMH Charge Cycle at 0.5C
1.60
4 SERIES NiMH 2100mAhr
AA CELLS CHARGED AT 0.5C
1.55
SINGLE CELL
VOLTAGE
1.50
45
40
35
1.45
1.40
1.45
1.30
0
BATTERY
TEMPERATURE
1A
CHARGE CURRENT
30
25
0.5A 20
TOP OFF
15
20 40 60 80 100 120 140 160 180 200
TIME (MINUTES)
4010 G03
Automatic Recharge Threshold
Voltage (per Cell)
1.375
1.355
1.335
1.315
1.295
1.275
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G06
Battery Present Threshold
Voltage (per Cell)
370
360
350
340
330
320
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G04
Battery Overvoltage Threshold
Voltage (per Cell)
2.05
2.03
2.01
1.99
1.97
1.95
1.93
1.91
1.89
1.87
1.85
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
4010 G07
Minimum Fast Charge Threshold
Voltage (per Cell)
950
940
930
920
910
900
890
880
870
860
850
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
4010 G05
–∆V Termination Voltage
(per Cell)
0
–5
–10 NiMH
–15
–20 NiCd
–25
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G08
Programmable Timer Accuracy
20 RTIMER = 49.9k
15
10
5
0
–5
–10
–15
–20
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G09
Charge Current Accuracy
5
3
TOP-OFF CHARGE
1
FAST CHARGE
–1 PRECHARGE
–3
–5
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G10
PWM Switching Frequency
1000
BAT = 4.8V
100
MINIMUM (LOW DROPOUT)
10 VCC = 12V
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
4010 G11
4010fb
5 Page 
LTC4010
Operation (Refer to Figure 1)
Charge Termination
Fast charge termination parameters are dependent upon
the battery chemistry selected with the CHEM pin. Volt-
age-based termination (–∆V) is always active after the
initial voltage stabilization period. If an external thermistor
network is present, chemistry-specific limits for ∆T/∆t (rate
of temperature rise) are also used in the termination algo-
rithm. Temperature-based termination, if enabled, becomes
active as soon as the fast charge state is entered.
Successful charge termination requires a charge rate
between C/2 and 2C. Lower rates may not produce the
battery voltage and temperature profile required for charge
termination.
Top-Off Charge State
If NiMH fast charge termination occurs because the
∆T/∆t limit is exceeded after an initial period of tMAX/12
has expired, the LTC4010 enters the top-off charge state.
Top-off charge is implemented by sourcing one-tenth the
programmed charge current for tMAX/3 minutes to ensure
that 100% charge has been delivered to the battery. The
CHRG status output is active during the top-off state. If
NiCd cells have been selected with the CHEM pin, the
LTC4010 never enters the top-off state.
Automatic Recharge State
Once charging is complete, the automatic recharge state
is entered to address the self-discharge characteristics of
nickel chemistry cells. The charge status output is inactive
during automatic recharge, but VCDIV remains switched
to GND to monitor the average cell voltage. If the VCELL
voltage drops below 1.325V without falling below 350mV,
the charge timer is reset and a new fast charge cycle is
initiated.
The internal termination algorithms of the LTC4010 are
adjusted when a fast charge cycle is initiated from auto-
matic recharge, because the battery should be almost fully
charged. Voltage-based termination is enabled immediately
and the NiMH ∆T/∆t limit is fixed at a battery temperature
rise of 1°C/minute.
Fault State
As discussed previously, the LTC4010 enters the fault state
based on detection of invalid battery voltages during vari-
ous charging phases. The IC also monitors the regulation
of the PWM control loop and will enter the fault state if
this is not within acceptable limits. Once in the fault state,
the battery must be removed or DC input power must be
cycled in order to initiate further charging. In the fault
state, the FAULT output is active, the READY output is
inactive, charging stops and the charge indicator output
is inactive. The VCDIV output remains connected to GND
to allow detection of battery removal.
Note that the LTC4010 also uses the FAULT output to indi-
cate that charging is suspended due to invalid battery or
internal die temperatures. However, the IC does not enter
the fault state in these cases and normal operation will
resume when all temperatures return to acceptable levels.
Refer to the Status Outputs section for more detail.
Insertion and Removal of Batteries
The LTC4010 automatically senses the insertion or removal
of a battery by monitoring the VCELL pin voltage. Should
this voltage fall below 350mV, the IC considers the bat-
tery to be absent. Removing and then inserting a battery
causes the LTC4010 to initiate a completely new charge
cycle beginning with charge qualification.
External Pause Control
After charging is initiated, the VTEMP pin may be used to
pause operation at any time. When the voltage between
VTEMP and GND drops below 200mV, the charge timer
pauses, fast charge termination algorithms are inhibited
and the PWM outputs are disabled. The status and VCDIV
outputs all remain active. Normal function is fully restored
from the previous state when pause ends.
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11
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC4010.PDF ] | |
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