DS2715
NiMH Battery Pack Charge Controller
www.maxim-ic.com
DESCRIPTION
The DS2715 is well suited for cost-sensitive charger
applications where the battery is either internal or in a
unique battery pack. It has been optimized for safe
reliable charging of 1 to10 NiMH cells in series. The
DS2715 has an internal gain block that can be
selected as either a comparator or transconductance
amplifier for charge current regulation. The DS2715 is
configurable as a switched DC charger, a linear
current regulator, or a switchmode current source.
The DS2715 pre-conditions severely depleted cells
are pre-conditioned before entering full charge mode.
The DS2715 terminates full charge using the dT/dt
technique. It requires an external thermistor for dT/dt
detection. Over-temperature, under-temperature, and
over-voltage detection prevents charging under
unsafe environmental conditions. A user selectable
charge timer allows charge rates from 0.15C to 2C.
Fast-charge, top-off and charge 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.
PIN CONFIGURATION
C
BIAS
CC1
V
CH
CC2
V
SS
LED1
LED1
VSS
LED2
LED2
V
SS
CSOUT
CTG
VN1
CTG
VN0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
BATT
VP2
THM
VP1
R
T
THM2
V
DD
THM1
SNS-
VDD
SNS+
TMR
DIV
CTST
MODE
DMSEL
16 SO
See Table 1 for Ordering Information.
Table 1. ORDERING INFORMATION
PART
DS2715Z+
DS2715Z+T&R
MARKING
DS2715+
DS2715+
PIN-PACKAGE
16 SO
16 SO Tape-and-Reel
FEATURES
摟
摟
摟
摟
摟
摟
摟
摟
摟
Charges 1 to 10 NiMH Cells
Fast Charges up to a 2C Rate
Pre-Charge and Top-Off Charge Modes Help Cell
Conditioning
Load Detection Allows the DS2715 to Enter Low
Power Sleep Mode (Less than 10碌A) 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 Outputs Display Charge State
Small 16-Pin SO Package
+ Denotes lead-free package.
OPERATIONAL DIAGRAM
CHARGE
SOURCE/LOAD
Vch
Vdd
Vbatt
Divide by n
DS2715
THM
+
GROUND
-
Sense
n Cells
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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