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DS2714
Quad, Loose-Cell NiMH Charger
GENERAL DESCRIPTION The DS2714 is ideal for standalone charging of 1 to 4
AA or AAA NiMH “loose” cells. NiCd cells can also be
charged. Temperature, voltage and charge time are
monitored to provide proper fast charging control
algorithms for Nickel Metal Hydride (NiMH) batteries.
Battery tests are included to detect defective or
inappropriate cells such as Alkaline primary batteries.
The DS2714 supports a parallel charging topology,
with independent monitoring and control of each cell.
APPLICATIONS Desktop/Standalone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
CHARGE TOPOLOGY DS2714
Controlled
Current
Source
GND
4-Cell NiMH Charger
FEATURES Charges 1 to 4 NiMH Cells Detects and Avoids Charging Alkaline Cells Pre-Charges Deeply Depleted Cells Fast Charges NiMH with -ΔV Termination
Sensitivity of 2mV (typ) Monitors Voltage, Temperature and Time for
Safety and Secondary Termination Works with Regulated Charge Current Source Drives PNP Type Pass Element Compatible with Integrated Primary-Side PWM
Controllers 20-pin TSSOP Package
ORDERING INFORMATION
PART MARKING PIN-PACKAGE DS2714E+ DS2714 20 TSSOP
DS2714E+T&R DS2714 20 TSSOP Tape-and-Reel
+Denotes lead-free package.
PIN CONFIGURATION
DS2714
Quad Loose Cell NiMH Charger
TSSOP
DS2714: Quad Loose Cell NiMH Charger
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to VSS -0.3V to +6V
Voltage on DMSEL VDD + 0.3V
Continuous Sink Current CC1-4, LED1-4 20mA
Operating Temperature Range -40°C to +85°C
Storage Temperature Range -55°C to +125°C
Soldering Temperature See IPC/JEDECJ-STD-020A
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS (4.0V ≤ VDD ≤ 5.5V; TA = -20°C to +70°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VDD (Note 1) 4.0 5.5 V
Input Voltage Range LEDx, DMSEL -0.3 5.5 V
DC ELECTRICAL CHARACTERISTICS (4.0V ≤ VDD ≤ 5.5V; TA = -20°C to +70°C. Unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current, VDD IDD Operating mode 500 750 μA
Output Voltage Low, CC1-4.
LED1-4 VOL1 VDD = 5.0V,
IOL = 20mA (Note 1) 1.0 V
Leakage Current,
CC1-4 LED1-4 ILKG VDD = 5.0V,
Output inactive -1 +1 μA
Threshold Voltage,
-ΔV Termination V-ΔV After tTHO 1.0 2.0 3.0 mV
Mode Test Current, DMSEL IMTST Pulse high/low once
<5ms after power-up - 5 15 μA
Input Logic High, DMSEL, VIH (Note 1) VDD -
0.2V V
Input Logic Low, DMSEL, VIL (Note 1) 0.2 V
Input Leakage Current,
DMSEL IIL1
After power-up mode
select,
DMSEL = VDD or VSS
-1 +1 μA
Threshold Voltage, Cell Test
Accuracy VCTST-ACC RTMR = 80KΩ -15 15 %
Threshold Voltage, Cell Test
Range VCTST-RANGE 32 400 mV
Threshold Voltage, Cell
Voltage Low VBAT-LOW CC1 = CC2 = hi-Z
(Note 1, 2) 0.9 1.0 1.1 V
Threshold Voltage, Cell
Voltage Max1 VBAT-MAX1 CC1 = CC2 = hi-Z
(Note 1, 2) 1.55 1.65 1.75 V
Threshold Voltage, Cell
Voltage Max2 VBAT-MAX2 CC1, CC2 active
(Note 1, 2) 1.64 1.75 1.86 V
Threshold Voltage, Thermistor
- Min VTHM-MIN (Note 1, 2, 6) VDD x
0.73 V
Threshold Voltage, Thermistor
- Max VTHM-MAX (Note 1, 2, 6) 0.30 VDD x
0.33 0.36 V
Threshold Voltage, Thermistor
- Stop VTHM-STOP (Note 1, 2, 6) VDD x
0.29 V
Threshold Current, TMR Pin
DS2714: Quad Loose Cell NiMH Charger
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Presence Test Current, VP1-4 IPTST 10 15 μA
Reverse Leakage Current,
VP1, VP2, VP3, VP4 ILKGR VDD = 0V, VPx = 1.5V 2 μA
ELECTRICAL CHARACTERISTICS: TIMING (4.0V ≤ VDD ≤ 5.5V; TA = -20°C to +70°C. Unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Internal Timebase Period tBASE (Note 5) 0.48 s
Internal Timebase
Accuracy -10 +10 %
Duty Factor, Fast Charge DF1 CCx 0.234
Duty Factor, Pre-
Charge/Top-Off DF2 CCx 0.0625
Duty Factor, Maintenance
Charge DF3 CCx Note 4 0.0078
Cell Test Interval tCTST (Note 3) 31 s
Pre-Charge Time-out tPCHG VCELL < VBAT-MIN 30.6 34 37.4 minutes
Fast Charge Termination
Hold-Off Period tTHO 3.6 4 4.4 minutes
Fast Charge Flat Voltage
Time-out tFLAT VCELL not increasing 14.4 16 17.6 minutes
Charge Timer Accuracy -5 +5 %
Charge Timer Range tCTMR-RANGE 0.5 10 h
Note 1: Voltages relative to VSS.
Note 2: Specification applicable during charge cycle with TA = 0°C to +70°C.
Note 3: One time slot out of every 16 available slots gets a Cell Test.
Note 4: One time slot out of every 32 available time slots gets a charge pulse.
Note 5: 0.48 seconds is one charge time slot. A complete cycle of 4 time slots (one charge time slot per cell) is 1.92 sec.
Note 6: VTHM-MIN, VTHM-MAX, and VTHM-STOP are fixed ratios of VDD. Their ranges never overlap.
Note 7: IMTST current is applied as a source current and as a sink current within 5ms after power-up.
DS2714: Quad Loose Cell NiMH Charger
PIN DESCRIPTION
PIN NAME FUNCTION 1 CC1
Charge Control 1. Turn on and off the charge PNP for Cell 1. 2 CC2
Charge Control 2. Turn on and off the charge PNP for Cell 2. 3 CC3
Charge Control 3. Turn on and off the charge PNP for Cell 3. 4 CC4
Charge Control 4. Turn on and off the charge PNP for Cell 4. 5 LED1
LED 1. Open drain output for LED. Display Cell 1 status. 6 LED2
LED 2. Open drain output for LED. Display Cell 2 status. 7 VSS
Device Ground. Return current path for LEDx pins. Both VSS pins must be connected to ground. 8 LED3
LED 3. Open drain output for LED. Display Cell 3 status. 9 LED4
LED 4. Open drain output for LED. Display Cell 4 status. 10 DMSEL
Display Mode Select. Select the LED blink rate. 11 CTST
Cell Test Resistor. Cell test threshold set. 12 TMR
Timer Resistor. Charge timer set. 13 VDD
Power-Supply Input. Chip supply input (4.0V to 5.5V). 14 VSS
Device Ground. Internally connected to Pin 7. Both VSS pins must be connected to ground. 15 VP1
Voltage Sense 1. Positive terminal sense input for Cell 1. 16 VP2
Voltage Sense 2. Positive terminal sense input for Cell 2. 17 VP3
Voltage Sense 3. Positive terminal sense input for Cell 3. 18 VP4
Voltage Sense 4. Positive terminal sense input for Cell 4. 19 THM1
Thermister 1. Thermister input for Cell 1 and 2. 20 THM2
Thermister 2. Thermister input for Cell 3 and 4.
DS2714: Quad Loose Cell NiMH Charger
Figure 1. Block Diagram
DS2714: Quad Loose Cell NiMH Charger
Figure 2. State Diagram
