Datasheet LTC4011 (Analog Devices)

LTC4011 High Efficiency Standalone Nickel Battery Charger FeaTures DescripTion n
Complete NiMH/NiCd Charger for 1 to 16 Cells
The LTC®4011 provides a complete, cost-effective nickel n
No Microcontroller or Firmware Required
battery fast charge solution in a small package using few n
550kHz Synchronous PWM Current Source Controller
external components. A 550kHz PWM current source n
No Audible Noise with Ceramic Capacitors
controller and all necessary charge initiation, monitoring n
PowerPath™ Control Support
and termination control circuitry are included. n Programmable Charge Current: 5% Accuracy The LTC4011 automatically senses the presence of a n Wide Input Voltage Range: 4.5V to 34V DC adapter and battery insertion or removal. Heavily n Automatic Trickle Precharge discharged batteries are precharged with a trickle cur- n –∆V Fast Charge Termination rent. The LTC4011 can simultaneously use both –∆V and n Optional ∆T/∆t Fast Charge Termination ∆T/∆t fast charge termination techniques and can detect n Automatic NiMH Top-Off Charge various battery faults. If necessary, a top-off charge is n Programmable Timer automatically applied to NiMH batteries after fast charg- n Automatic Recharge ing is completed. The IC will also resume charging if the n Multiple Status Outputs battery self-discharges after a full charge cycle. n Micropower Shutdown n 20-Lead Thermally Enhanced TSSOP Package All LTC4011 charging operations are qualified by actual charge time and maximum average cell voltage. Charging applicaTions may also be gated by minimum and maximum temperature limits. NiMH or NiCd fast charge termination parameters n Integrated or Standalone Battery Charger are pin-selectable. n Portable Instruments or Consumer Products Integrated PowerPath control support ensures that the n Battery-Powered Diagnostics and Control system remains powered at all times without allowing load n Back-Up Battery Management transients to adversely affect charge termination. 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. Typical applicaTion
2A NiMH Battery Charger
FROM
2A NiMH Charge Cycle at 1C
ADAPTER 5V 10µF INFET FAULT CHRG TOC READY 4.7µH 10µF 0.1µF 0.033µF 0.068µF 4011fb Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts