DS2715 Datasheet, PDF (1/17 Pages) Dallas Semiconductor – NiMH Battery Pack Charge Controller

19-4592; 4/09
DS2715
NiMH Battery Pack Charge Controller
www.maxim-ic.com
DESCRIPTION
The DS2715 is well suited for cost-sensitive charger
applications where the battery pack is either internal
or external to the application. It has been optimized for
safe and reliable charging of 1 to 10 NiMH cells in
series. The internal gain block can be selected as
either a comparator or transconductance amplifier for
charge current regulation. This makes the DS2715
configurable as a switched DC charger, a linear
current regulator, or a switchmode current source.
The DS2715 pre-conditions severely depleted cells
before entering full charge mode. It terminates full
charge using the dT/dt technique, which requires an
external sensing thermistor. Over-temperature, under-
temperature, and over-voltage detection prevents
charging under unsafe conditions. A user selectable
charge timer allows charge rates from 0.167C to 2C.
FAST-CHARGE, TOPOFF and DONE modes are
included for highly reliable, safe charging of NiMH
cells. Discharge mode allows the DS2715 to enter a
low power sleep state while the cell pack is being
discharged.
FEATURES
 Charges 1 to 10 NiMH Cells
 FAST-CHARGE at up to a 2C Rate
 PRECHARGE and TOPOFF Charge Modes Help
Cell Conditioning
 Load Detection Allows the DS2715 to Enter Low
Power Sleep Mode (Less than 10µA) while the
Cell Pack is Discharged
 dT/dt Charge Termination Eliminates Cell Charge
Stress
 Monitors Voltage, Temperature, and Time for
Safety and Secondary Termination
 Regulates Current through Either Linear Control
or Switch-Mode Control
 LED Output Displays Charge State
 Small 16-Pin SO Package
PIN CONFIGURATION
C_BIAS
V_CH
V_SS
LED1
DNC
V_SS
CTG
CTG
V_BATT
THM
R_T
V_DD
SNS-
SNS+
DIV
MODE
16 SO
See Table 1 for Ordering Information.
Table 1. ORDERING INFORMATION
PART
DS2715Z+
MARKING PIN-PACKAGE
D2715 16 SO
DS2715Z+T&R
D2715 16 SO
DS2715BZ+
D2715B 16 SO
DS2715BZ+T&R D2715B 16 SO
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
OPERATIONAL DIAGRAM
APPLICATIONS
Portable DVD Players
Portable Television Sets
Handheld Gaming
Test Equipment
Handheld POS Terminals
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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