DS2710G+ Maxim Integrated Products, DS2710G+ Datasheet

IC NIMH CHRGR SGL-CELL 10-TDFN

DS2710G+

Manufacturer Part Number
DS2710G+
Description
IC NIMH CHRGR SGL-CELL 10-TDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS2710G+

Function
Charge Management
Battery Type
Nickel Metal Hydride (NiMH)
Voltage - Supply
4 V ~ 5.5 V
Operating Temperature
-20°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
10-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The DS2710 is ideal for in-system charging of single-cell
nickel metal hydride (NiMH) cells for low-current
portable applications. Inputs to the DS2710 include USB
voltage sources and 5V regulated adapters.
Temperature, voltage, and charge time are monitored to
provide proper fast-charging control algorithms for
single-cell NiMH or nickel cadmium (NiCd) batteries.
The DS2710 includes battery tests to detect defective or
inappropriate cells such as alkaline primary batteries.
Rev 0; 4/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
GROUND
CHARGE
SOURCE
Small Rechargeable Devices
Voice Recorders
Cordless Mouse
Battery-Powered Toys
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
V
DD
VN0
General Description
DS2710
SENSE
CS
VN1
THM
VP1
Applications
NiMH
CELL
Single-Cell NiMH Charger
♦ Charges Single-Cell NiMH Cells
♦ Switch-Mode Topologies Supported by Hysteretic
♦ Precharges Deeply Depleted Cells
♦ Fast-Charges NiMH with -ΔV Termination
♦ Monitors Voltage, Temperature, and Time for
♦ Regulates Charge Current
♦ Designed for External pMOS
♦ Rail-to-Rail MOSFET Driver
♦ Tiny 10-Pin TDFN Package (3mm x 4mm)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
* EP = Exposed pad.
DS2710G+
DS2710G+T&R
Control Technique
Sensitivity of 2mV (typ)
Safety and Secondary Termination
TOP VIEW
STATUS
*EXPOSED PAD.
THM
V
V
CS
DD
SS
PART
1
2
3
4
5
+
*EP
(3mm
Ordering Information
DS2710
TDFN
×
Pin Configuration
4mm)
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10
9
8
7
6
Features
VP1
VN1
VN0
TMR
CTEST
1

Related parts for DS2710G+

DS2710G+ Summary of contents

Page 1

... Monitors Voltage, Temperature, and Time for Safety and Secondary Termination Applications ♦ Regulates Charge Current ♦ Designed for External pMOS ♦ Rail-to-Rail MOSFET Driver ♦ Tiny 10-Pin TDFN Package (3mm x 4mm) DS2710G+ DS2710G+T&R + Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel Exposed pad. TOP VIEW ...

Page 2

Single-Cell NiMH Charger ABSOLUTE MAXIMUM RATINGS Voltage Range on All Pins Relative Continuous Source/Sink Current CS ...................................20mA Continuous Source Current STATUS ..................................10mA Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. ...

Page 3

DC ELECTRICAL CHARACTERISTICS (continued) (4.0V ≤ V ≤ 5.5V -20°C to +70°C, unless otherwise noted PARAMETER SYMBOL Cold Temperature Detect V THM-MIN Threshold Hot Temperature No-Start V THM-MAX Threshold Hot Temperature Safety V THM-STOP Shutdown Threshold ...

Page 4

Single-Cell NiMH Charger PIN NAME 1 V Device Ground. Connects directly to the negative terminal of the charge source Charge Source. Feedback control for switching circuitry. Power-Supply Input. Connects to the positive terminal of the charge source ...

Page 5

Detailed Description Charge Algorithm Overview The DS2710 controls switch-mode topology charging of a single NiMH cell from a voltage-regulated charge source. The IC is reset in one of two ways: with the application of power to the DS2710 or after ...

Page 6

Single-Cell NiMH Charger R > R TMR (ASYNCHRONOUSLY FROM ANYWHERE) V < UVLO UHYS (ASYNCHRONOUSLY FROM ANYWHERE) t < t PCHG AND V < 1.0V CELL V CELL T < +50°C t < FAST TIMEOUT t ...

Page 7

MAINTENANCE state any time during FAST- CHARGE the cell voltage exceeds V DS2710 determines that the cell is either overcharged or has been removed, and enters the FAULT state. CELL TEST is performed once every 31s during ...

Page 8

Single-Cell NiMH Charger Charge-Current Regulation The DS2710 regulates charge current by maintaining a constant average voltage across an external sense resistor connected between the VN1 and VN0 pins. VN1 and VN0 drive an internal comparator in the DS2710 to switch ...

Page 9

TOP-OFF complete normally if the cell temperature remains below this threshold. Used with a 10kΩ resistor, the Semitec 103AT-2 pro- vides approximately 0.9% full scale-per-degree sensi- tivity. Figure 4 shows this linearity curve. The left axis is the ratio of ...

Page 10

Single-Cell NiMH Charger Timeout Selection FAST-CHARGE state normally operates until -ΔV termi- nation. In the event that termination does not occur cor- rectly, a safety timeout is required. This timeout is set by an external resistor on the TMR pin ...

Page 11

R1 150Ω R4 10kΩ C1 1μF RT1 103AT-2 GROUND (USB-) Figure 5. Typical Application Circuit for USB Port Charging Referring to the example circuit and layout of Figure 6, the loop labeled as Loop1 encompassing ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...

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