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112602

FEATURES

§ 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 1-Wire

Device Address

§ 8-Pin mSOP Package

§ Low Power Consumption:

- Active Current:

12.5

mA typ

- Sleep Current:

1.5

mA typ

PIN CONFIGURATION

PIN DESCRIPTION

PLS - Battery-Pack Positive Terminal Input

PS

- Power-Switch Sense Input

DQ - Data Input/Output

CP - Reservoir Capacitor

CC - Charge Control Output

DC - Discharge Control Output

DESCRIPTION

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 factory-

programmed 64-bit net address that allows it to be individually addressed by the host system.

DS2720U

mSOP

PS

3

2

1

45

6

7

8

PLS

DQ

CC

DC

CP

DS2720

Efficient, Addressable Single-Cell

Rechargeable Lithium Protection IC

www.maxim-ic.com

1-Wire is a registered trademark of Dallas Semiconductor.