DS2720

· echargeable Lithium-Ion (Li+) SafetyCircuit- Overvoltage Protection- Overcurrent/Short-Circuit Protection- Undervoltage Protection- Overtemperature Protection
· Controls High-Side N-Channel PowerMOSFETs Driven from 9V Charge Pump
· System Power Management and ControlFeature Support
· Eight Bytes of Lockable EEPROM
· Dallas 1-Wire® Interface with Unique 64-BitDevice Address
· 8-Pin
SOP Package
· Low Power Consumption:- Active Current: 12.5A typ- Sleep Current: 1.5A typ

Voltage on PLS, Relative to VSS                                                                            -0.3V to +18V
Voltage on CC, DC, and CP Pins, Relative to VSS                                                  -0.3V to +12V
Voltage on any Other Pin, Relative to VSS                                                            -0.3V to +6V
Operating Temperature Range                                                                             -40°C to +85°C
Storage Temperature Range                                                                                -55°C to +125°C
Soldering Temperature                                                                                          See IPC/JEDEC-STD-020A

* This is a stress rating only and functional operation of the device at these or any other conditions abovethose indicated in the operation sections of this specification is not implied. Exposure to absolutemaximum rating conditions for extended periods of time may affect reliability.

The DS2720 single-cell rechargeable Li+ protection IC provides electronic safety functions required forrechargeable Li+ applications including protecting the battery during charge, protection of the circuitfrom damage during periods of excess current flow and maximization of battery life by limiting the levelof cell depletion. Protection is facilitated by electronically disconnecting the charge and dischargeconduction path with switching devices such as low-cost N-channel power MOSFETs.

Since the DS2720 provides high-side drive to external N-channel protection MOSFETs from a 9V chargepump, superior on-resistance performance results compared to common low-side protector circuits usingthe same FETs. The FET on-resistance actually decreases as the battery discharges.

Two types of user-memory are provided on the DS2720 for battery information storage: EEPROM andlockable EEPROM. EEPROM memory saves important battery data in true nonvolatile (NV) memorythat is unaffected by severe battery depletion, accidental shorts, or ESD events. Lockable EEPROMbecomes ROM when locked to provide additional security for unchanging battery data.

Adding to the uniqueness of the DS2720 is the ability of the system to control the FETs from either thedata interface or a dedicated input thereby eliminating the power-switch control redundancy ofrechargeable Li+ battery systems.

Through its 1-Wire interface, the DS2720 gives the host system read/write access to status and controlregisters, instrumentation registers, and general-purpose data storage. Each device has a factoryprogrammed64-bit net address that allows it to be individually addressed by the host system.