LTC4010 Datasheet, PDF (1/20 Pages) Linear Integrated Systems – High Efficiency Standalone Nickel Battery Charger

FEATURES
■ _{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}
■ _{–∆V Fast Charge Termination}
■ _{Optional ∆T/∆t 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}
U
APPLICATIO S
■ _{Integrated or Standalone Battery Charger}
■ _{Portable Instruments or Consumer Products}
■ _{Battery-Powered Diagnostics and Control}
■ _{Back-Up Battery Management}
Electrical Specifications Subject to Change
LTC4010
High Efficiency Standalone
Nickel Battery Charger
DESCRIPTIO
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 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 –∆V and ∆T/∆t 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.
TYPICAL APPLICATIO
2A NiMH Battery Charger
FROM
ADAPTER
5.5V TO 34V
3k
10µF
LTC4010
V_CC
R
FAULT TGATE
CHRG
READY
BGATE
TIMER PGND
49.9k
GND
CHEM
SENSE
BAT
10k
V_CDIV
V_CELL
10k
10µF
33nF
INTV_DD V_TEMP
0.1µF
68nF
TO
SYSTEM
LOAD
10µH
0.05Ω
2-CELL
NiMH PACK
WITH 10k NTC
4010 TA01a
Typical NiMH Charge at 1.25C
2.2
50
2.0
45
1.8
40
1.6
TOP OFF 35
CHARGE
1.4
30
1.2
25
1.0
0
10 20 30 40
TIME (MINUTES)
20
50 60
4011 TA01b
4010p
1