DS2720AU+T&R

DS2720AU+T&R Datasheet


DS2720

Part Datasheet
DS2720AU+T&R DS2720AU+T&R DS2720AU+T&R (pdf)
Related Parts Information
DS2720CU+T&R DS2720CU+T&R DS2720CU+T&R
DS2720BU+ DS2720BU+ DS2720BU+
DS2720BU+T&R DS2720BU+T&R DS2720BU+T&R
DS2720AU+ DS2720AU+ DS2720AU+
PDF Datasheet Preview
§ Rechargeable Lithium-Ion Li+ Safety Circuit - Overvoltage Protection - Overcurrent/Short-Circuit Protection - Undervoltage Protection - Overtemperature Protection
§ Controls High-Side N-Channel Power MOSFETs Driven from 9V Charge Pump
§ System Power Management and Control Feature Support
§ Eight Bytes of Lockable EEPROM § Dallas Interface with Unique 64-Bit

Device Address § 8-Pin mSOP Package § Low Power Consumption:
- Active Current 12.5mA typ - Sleep Current 1.5mA typ

DS2720

Efficient, Addressable Single-Cell Rechargeable Lithium Protection IC

PIN CONFIGURATION

PLS 1

DS2720U mSOP

PIN DESCRIPTION

PLS - Battery-Pack Positive Terminal Input

PS - Power-Switch Sense Input DQ - Data Input/Output VSS - Device Ground VDD - Power-Supply Input CP - Reservoir Capacitor CC - Charge Control Output DC - Discharge Control Output

The DS2720 single-cell rechargeable Li+ protection IC provides electronic safety functions required for rechargeable Li+ applications including protecting the battery during charge, protection of the circuit from damage during periods of excess current flow and maximization of battery life by limiting the level of cell depletion. Protection is facilitated by electronically disconnecting the charge and discharge conduction 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 charge pump, superior on-resistance performance results compared to common low-side protector circuits using the same FETs. The FET on-resistance actually decreases as the battery discharges.

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

Through its 1-Wire interface, the DS2720 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each device has a factoryprogrammed 64-bit net address that allows it to be individually addressed by the host system.
1-Wire is a registered trademark of Dallas Semiconductor.
1 of 21
080205

DS2720

Two types of user-memory are provided on the DS2720 for battery information storage EEPROM and lockable EEPROM. EEPROM memory saves important battery data in true nonvolatile NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events. Lockable EEPROM becomes ROM when locked to provide additional security for unchanging battery data.
ORDERING INFORMATION

PART DS2720AU+ DS2720AU+T&R DS2720BU+ DS2720BU+T&R DS2720CU+ DS2720CU+T&R DS2720AU/T&R DS2720BU/T&R DS2720CU/T&R
+ Denotes lead-free package.

DESCRIPTION DS2720+ in 8-Lead mSOP in Bulk with VOVA = 4.275V DS2720+ in 8-Lead mSOP in Tape-and-Reel with VOVA = 4.275V DS2720+ in 8-Lead mSOP in Bulk with VOVB = 4.35V DS2720+ in 8-Lead mSOP in Tape-and-Reel with VOVB = 4.35V DS2720+ in 8-Lead mSOP in Bulk with VOVC = 4.30V DS2720+ in 8-Lead mSOP in Tape-and-Reel with VOVC = 4.30V DS2720 in 8-Lead mSOP in Bulk with VOVA = 4.275V DS2720 in 8-Lead mSOP in Tape-and-Reel with VOVA = 4.275V DS2720 in 8-Lead mSOP in Bulk with VOVB = 4.35V DS2720 in 8-Lead mSOP in Tape-and-Reel with VOVB = 4.35V DS2720 in 8-Lead mSOP in Bulk with VOVC = 4.30V DS2720 in 8-Lead mSOP in Tape-and-Reel with VOVC = 4.30V
2 of 21

Figure BLOCK DIAGRAM

DS2720
1-WIRE INTERFACE AND CONTROL

TEMP SENSOR

Tdevice
64-BIT ROM LOCKABLE EEPROM STATUS/CONTROL

TMAX

OUTPUT BUFFER

VOV VCE

DELAY tOVD

DELAY
tUVD

RTST 2

VCH VSC

DELAY tOCD

DELAY tSCD
1 Normally open, closed to enable test current, ITST 2 Normally open, closed to enable test current, ITST, and recovery charge

See Rechargeable Li+ Protection Circuitry section for more information.
3 of 21

DS2720

Table DETAILED PIN DESCRIPTION

SYMBOL DESCRIPTION

Battery-Pack Positive Terminal Input. The device monitors the state of the battery
pack’s positive terminal through this pin in order to detect events such as the attachment of a charger or the removal of a short circuit. Connect PLS to the pack positive terminal
through a 100W resistor.

Power-Switch Sense Input. The device wakes up from sleep mode when it senses the
closure of a switch to VSS on this pin. PS has a high-impedance internal pullup.

Data Input/Out. 1-Wire data line. Open-drain output driver. Connect this pin to the DATA terminal of the battery pack. DQ has an internal 0.5mA pull-down.

Device Ground. Connect directly to the negative terminal of the battery cell.

Power Supply Input. Connect VDD to the positive terminal of the battery cell through a decoupling network.

Charge Pump Output. The internal charge pump regulates CP to 9V which supplies
the ON state drive to the protection FETs. Connect a 0.1mF reservoir capacitor from CP
to VSS.

Charge Protection Control Output. Controls an external N-channel high-side charge protection FET.

Discharge Protection Control Output. Controls an external N-channel high-side discharge protection FET.

Figure APPLICATION EXAMPLE
More datasheets: CBBF-100 | CBBF-150 | CBBF-40 | CBBF-50 | CBBF-60 | CBBF-75 | CBBF-80 | CBBF-MBC | PNX-91430 | FDS7088N7


Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived DS2720AU+T&R Datasheet file may be downloaded here without warranties.

Datasheet ID: DS2720AU+T&R 508395