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LTC4011EFE Datasheet

  • LTC4011EFE

  • Linear Technology [High Efficiency Standalone Nickel Batter...

  • 227.94KB

  • LINER

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Electrical Specifications Subject to Change
LTC4011
High Efficiency Standalone
Nickel Battery Charger
FEATURES
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DESCRIPTIO
Complete NiMH/NiCd Charger for 1 to 16 Cells
No Microcontroller or Firmware Required
550kHz Synchronous PWM Current Source Controller
No Audible Noise with Ceramic Capacitors
PowerPath
TM
Control Support
Programmable Charge Current: 5% Accuracy
Wide Input Voltage Range: 4.5V to 34V
Automatic Trickle Precharge
鈥撯垎V Fast Charge Termination
Optional
鈭員/鈭唗
Fast Charge Termination
Automatic NiMH Top-Off Charge
Programmable Timer
Automatic Recharge
Multiple Status Outputs
Micropower Shutdown
20-Lead Thermally Enhanced TSSOP Package
The LTC
庐
4011 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 LTC4011 automatically senses the presence of a DC
adapter and battery insertion or removal. Heavily dis-
charged batteries are precharged with a trickle current.
The LTC4011 can simultaneously use both 鈥撯垎V and
鈭員/鈭唗
fast charge termination techniques and can detect various
battery faults. If necessary, a top-off charge is automati-
cally 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 LTC4011 charging operations are qualified by actual
charge time and maximum average cell voltage. Charging
may also be gated by minimum and maximum tempera-
ture limits. NiMH or NiCd fast charge termination param-
eters are pin-selectable.
Integrated PowerPath control support ensures that the
system remains powered at all times without allowing load
transients to adversely affect charge termination.
APPLICATIO S
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Integrated or Standalone Battery Charger
Portable Instruments or Consumer Products
Battery-Powered Diagnostics and Control
Back-Up Battery Management
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
PowerPath is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
FROM
ADAPTER
4.5V TO 34V
3k
INFET
FAULT
CHRG
TOC
READY
V
CC
TGATE
2A NiMH Battery Charger
TO
SYSTEM
10碌F LOAD
1.60
1.55
BGATE
10碌H
CELL VOLTAGE (V)
1.50
1.45
1.40
1.35
1.30
SINGLE CELL
VOLTAGE
BATTERY
TEMPERATURE
CHARGE
CURRRENT
2A
1A
TOP OFF
80
38
36
34
32
30
28
100
4011 TA01b
20k
49.9k
PGND
LTC4011
DCIN
SENSE
TIMER
BAT
GND
V
CDIV
CHEM
V
CELL
V
RT
INTV
DD
V
TEMP
0.1碌F
10k
10k
0.05鈩?/div>
10碌F
0.033碌F
0.068碌F
30.9k
10.7k
2-CELL
NiMH PACK
WITH 10k NTC
(2AHr)
4011 TA01a
1.25
0
20
60
40
TIME (MINUTES)
U
Typical NiMH Charge Cycle at 1C
42
40
U
U
BATTERY TEMPERATURE (掳C)
4011p
1

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