DS2715 Datasheet, PDF (1/12 Pages) Dallas Semiconductor – NiMH Battery Pack Charge Controller

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.
FEATURES
§ 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 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 Outputs Display Charge State
§ Small 16-Pin SO Package
PIN CONFIGURATION
C^CBC^IA1^S
1
C^VC^C2^H
2
LE^VD^S1^S
3
L_VE_SD_S1
4
L^LE^ED^D22 5
CSO^VU^ST^S
6
V^CN^TG1
7
V^CN^TG0
8
16
V_VB_PAT₂T
15 ^TV^HP^M1
14
R_TT_HM2
13
V_TD_HD _M1
12 ^SV^ND^SD^-
11 ^ST^NM^SR⁺
10 ^DC^IVTST
9 ^MD^OM^DS^EEL
16 SO
See Table 1 for Ordering Information.
Table 1. ORDERING INFORMATION
PART
MARKING
DS2715Z+
DS2715+
DS2715Z+T&R DS2715+
+ Denotes lead-free package.
PIN-PACKAGE
16 SO
16 SO Tape-and-Reel
OPERATIONAL DIAGRAM
CHARGE
SOURCE/LOAD
GROUND
Vch
Vdd
Vbatt
DS2715
THM
Divide by n
+-
n Cells
Sense
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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