ADP3820

Features:

±1% Total Accuracy
630 A Typical Quiescent Current
Shutdown Current: 1 mA (Typical)
Stable with 10 mF Load Capacitor
4.5 V to 15 V Input Operating Range
Integrated Reverse Leakage Protection
6-Lead SOT-23-6 and 8-Lead SO-8 Packages
Programmable Charge Current
208C to +858C Ambient Temperature Range
Internal Gate-to-Source Protective Clamp




Application

Li-Ion Battery Chargers
Desktop Computers
Hand-Held Instruments
Cellular Telephones
Battery Operated Devices




Pinout








Specifications

Input Voltage, VIN Ê . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .120 V
Enable Input Voltage . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .0.3 V to (VIN + 0.3 V)
Operating Ambient Temperature Range . . . .. . . . . . . . . . . . . . . . . . . . . .20°C to +85°C
Storage Temperature Range . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .65°C to +150°C
qJA, SO-8 Package . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . 150°C/W
qJA, SOT-23-6 Package . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . .230°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .+300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. .+220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 2 kV

Description

The ADP3820 is a precision single cell Li-Ion battery charge controller that can be used with an external Power PMOS device to form a two-chip, low cost, low dropout linear battery charger. It is available in two voltage options to accommodate Li-Ion batteries with coke or graphite anodes. The ADP3820's high accuracy (±1%) low shutdown current (1 mA) and easy charge current programming make this device especially attractive
as a battery charge controller.

Charge current can be set by an external resistor. For example, 50 mW of resistance can be used to set the charge current to 1 A. Additional features of ADP3820 include foldback current limit, overload recovery, and a gate-to-source voltage clamp to protect the external MOSFET. The proprietary circuit also minimizes the reverse leakage current from the battery if the input voltage of the charger is disconnected. This feature eliminates
the need for an external serial blocking diode.

The ADP3820 operates with a wide input voltage range from 4.5 V to 15 V. It is specified over the industrial temperature range of 20°C to +85°C and is available in the ultrasmall 6-lead surface mount SOT-23-6 and 8-lead SOIC packages.