LTC4010_15 Datasheet, PDF (1/24 Pages) Linear Technology – High Efficiency Standalone Nickel Battery Charger

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
V_CC
FAULT TGATE
CHRG
READY
BGATE
TIMER PGND
49.9k
GND
CHEM
SENSE
BAT
10k
V_CDIV
V_CELL
10k
10µF
33nF
INTV_DD VTEMP
0.1µF
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
38
SINGLE CELL
1.45
VOLTAGE
36
1.40
1.35
1.30
1.25
0
BATTERY
34
TEMPERATURE
2A
32
CHARGE
CURRRENT
1A
30
TOP OFF
28
20
40
60
80 100
TIME (MINUTES)
4010 TA01b
4010fb