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Maxim Integrated Semiconductor Electronic Components Datasheet

DS2712 Datasheet

(DS2711 / DS2712) Loose Cell NiMH Chargers

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19-5826; Rev 4/11
GENERAL DESCRIPTION
The DS2711 and DS2712 are ideal for in-system or
stand-alone charging of 1 or 2 AA or AAA NiMH
“loose” cells. 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 DS2711/DS2712 support series and parallel
topologies, with independent monitoring and control of
each cell. Charging of NiCd chemistry cells is also
supported.
APPLICATIONS
Desktop/Stand-Alone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
FEATURES
Charge 1 or 2 NiMH Cells
Detect and Avoid Charging Alkaline Cells
Precharge Deeply Depleted Cells
Fast Charge NiMH with -V Termination
Sensitivity of 2mV (typ)
Monitor Voltage, Temperature, and Time for
Safety and Secondary Termination
Regulate Charge Current:
Linear Control (DS2711)
Switch-Mode Control (DS2712)
Drive pMOS or pnp-Type Pass Element or
Switch, or an Optocoupler
Compatible with Popular Optocouplers and
Integrated Primary-Side PWM Controllers
Small 16-Pin SO or TSSOP Packages
DS2711/DS2712
Loose-Cell NiMH Chargers
PIN CONFIGURATION
CC1
CC2
LED1
VSS
LED2
CSOUT
VN1
VN0
1
2
3
4
5
6
7
8
16 VP2
15 VP1
14 THM2
13 THM1
12 VDD
11 TMR
10 CTST
9 DMSEL
SO (150 mils)
TSSOP (4.4mm)
PIN DESCRIPTION
PIN NAME
FUNCTION
1 CC1 Cell 1 Charge-Control Output
2 CC2 Cell 2 Charge-Control Output
3 LED1 Cell 1 Status
4
VSS
Ground Reference and Chip-
Supply Return
5 LED2 Cell 2 Status, Mode-Select Input
6 CSOUT Current-Sense Output
7 VN1 Current-Sense + Input
8 VN0 Current-Sense - Input
9 DMSEL Display-Mode Select
10 CTST Cell Test Threshold Set
11 TMR Charge Timer Set
12 VDD Chip-Supply Input (4.0V to 5.5V)
13 THM1 Cell 1 Thermistor Input
14 THM2 Cell 2 Thermistor Input
15
VP1
Cell 1 Positive-Terminal Sense
Input
16
VP2
Cell 2 Positive-Terminal Sense
Input
1 of 15


Maxim Integrated Semiconductor Electronic Components Datasheet

DS2712 Datasheet

(DS2711 / DS2712) Loose Cell NiMH Chargers

No Preview Available !

DS2711/DS2712: Loose-Cell NiMH Chargers
ABSOLUTE MAXIMUM RATINGS
Voltage Range on All Pins Relative to VSS……………………………………………………………………-0.3V to +6V
Voltage Range on DMSEL……………………………………………….……………………………………….VDD + 0.3V
Continuous Sink Current CC1, CC2, LED1, LED2, and CSOUT………………………………............................20mA
Operating Temperature Range………………………………………………………………………………-40°C to +85°C
Storage Temperature Range……………………………………………………………………………….-55°C to +125°C
Lead Temperature (soldering, 10s) ................................................................................................................. +300°C
Soldering Temperature (reflow)
Lead(Pb)-free ............................................................................................................................................ +260°C
Containing lead(Pb)................................................................................................................................... +240°C
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(4.0V VDD 5.5V, TA = -20°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX UNITS
Supply Voltage
VDD (Note 1)
4.0 5.5 V
Input Voltage Range
LED2, 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
250 500
µA
UVLO Threshold
UVLO Hysteresis
Output-Voltage Low,
CC1, CC2, LED1, LED2
Output-Voltage Low,
CSOUT
Leakage Current,
CC1, CC2, LED1, LED2,
CSOUT
Threshold Voltage,
-V Termination
Mode Test Current,
DMSEL, LED2
Input Logic-High,
DMSEL, LED2
Input Logic-Low, DMSEL,
LED2
Input Leakage Current,
DMSEL
Threshold Voltage, Cell
Test
Threshold Voltage, Cell
Voltage Low
Threshold Voltage, Cell
Voltage Max1
Threshold Voltage, Cell
Voltage Max2
Threshold Voltage Delta
VUVLO
VUHYS
VOL1
VOL2
ILKG
V-V
IMTST
VIH
VIL
IIL1
VCTST
VBAT-LOW
VBAT-MAX1
VBAT-MAX2
VBAT-MAXΔ
VDD rising (Note 1)
VDD falling from above
VUVLO
VDD = 5.0V,
IOL = 20mA (Note 1)
VDD = 5.0V,
IOL = 20mA (Note 1)
VDD = 5.0V,
Output inactive
After tTHO
(Notes 2, 3)
(Note 1)
(Note 1)
After power-up mode
select,
DMSEL = VDD or VSS
RCTST = 80k
CC1 = CC2 = high-Z
(Note 4)
CC1 = CC2 = high-Z
(Note 4)
CC1, CC2 active
(Note 4)
VBAT-MAX2 - VBAT-MAX1
(Note 5)
3.5 3.9
40
1.0
0.75
1.25
-1 +1
1.0
VDD -
0.2
2.0
5
3.0
15
0.2
-1 +1
85
0.9
1.55
1.64
90
100
1.0
1.65
1.75
100
115
1.1
1.75
1.86
110
V
mV
V
V
µA
mV
µA
V
V
µA
mV
V
V
V
mV
2 of 15


Part Number DS2712
Description (DS2711 / DS2712) Loose Cell NiMH Chargers
Maker Maxim Integrated Products
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DS2712 Datasheet PDF






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