LTC4011_15 Datasheet, PDF (1/26 Pages) Linear Technology – High Efficiency Standalone Nickel Battery Charger

LTC4011
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 Synchronous PWM Current Source Controller}
n _{No Audible Noise with Ceramic Capacitors}
n _{PowerPath™ Control Support}
n _{Programmable Charge Current: 5% Accuracy}
n _{Wide Input Voltage Range: 4.5V to 34V}
n _{Automatic Trickle Precharge}
n _{–∆V Fast Charge Termination}
n _{Optional ∆T/∆t Fast Charge Termination}
n _{Automatic NiMH Top-Off Charge}
n _{Programmable Timer}
n _{Automatic Recharge}
n _{Multiple Status Outputs}
n _{Micropower Shutdown}
n _{20-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}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Description
The LTC^®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
discharged batteries are precharged with a trickle cur-
rent. The LTC4011 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 charg-
ing 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 temperature
limits. NiMH or NiCd fast charge termination parameters
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.
Typical Application
FROM
ADAPTER
5V
2A NiMH Battery Charger
INFET
FAULT
CHRG
TOC
READY
10µF
4.7µH
2A NiMH Charge Cycle at 1C
10µF
0.1µF
0.033µF
0.068µF
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