鈻?/div>
DESCRIPTIO
Complete NiMH/NiCd Charger for 1 to 16 Cells
No Microcontroller or Firmware Required
550kHz PWM Current Source Controller
No Audible Noise with Ceramic Capacitors
Wide Input Voltage Range: 5.5V to 34V
Programmable Charge Current: 5% Accuracy
Automatic Trickle Precharge
鈥撯垎V Fast Charge Termination
Optional
鈭員/鈭唗
Fast Charge Termination
Optional Temperature Qualification
Automatic NiMH Top-Off Charge
Programmable Maximum Charging Durations
Automatic Recharge
Multiple Status Outputs
Micropower Shutdown
16-Lead Thermally Enhanced TSSOP Package
The LTC
庐
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 exter-
nal DC source is not present, the LTC4010 enters shut-
down 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 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 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 tempera-
ture limits. NiMH or NiCd fast charge termination param-
eters are pin selectable.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Integrated or Standalone Battery Charger
Portable Instruments or Consumer Products
Battery-Powered Diagnostics and Control
Back-Up Battery Management
TYPICAL APPLICATIO
FROM
ADAPTER
5.5V TO 34V
2A NiMH Battery Charger
TO
SYSTEM
LOAD
LTC4010
V
CC
TGATE
3k
R
10碌F
2.2
2.0
1.8
1.6
1.4
1.2
TOP OFF
CHARGE
AVERAGE CELL VOLTAGE (V)
FAULT
CHRG
READY
TIMER
49.9k
GND
CHEM
BGATE
PGND
SENSE
0.05鈩?/div>
BAT
10k
V
CDIV
V
CELL
33nF
10k
10碌F
2-CELL
NiMH PACK
WITH 10k NTC
10碌H
1.0
0.1碌F
INTV
DD
V
TEMP
68nF
4010 TA01a
U
Typical NiMH Charge at 1.25C
50
45
40
35
30
25
20
U
U
CELL CASE TEMPERATURE (掳C)
0
10
20
30
40
TIME (MINUTES)
50
60
4011 TA01b
4010p
1
next
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