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ADP3820AR-42 View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
ADP3820AR-42 Lithium-Ion Battery Charger ADI
Analog Devices ADI
'ADP3820AR-42' PDF : 8 Pages
1 2 3 4 5 6 7 8
a
FEATURES
؎1% Total Accuracy
630 A Typical Quiescent Current
Shutdown Current: 1 A (Typical)
Stable with 10 F 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
–20؇C to +85؇C Ambient Temperature Range
Internal Gate-to-Source Protective Clamp
APPLICATIONS
Li-Ion Battery Chargers
Desktop Computers
Hand-Held Instruments
Cellular Telephones
Battery Operated Devices
Lithium-Ion
Battery Charger
ADP3820
FUNCTIONAL BLOCK DIAGRAM
SD
VREF
BIAS
+
VIN
50mV
IS
GATE
VOUT
ADP3820
GND
GENERAL DESCRIPTION
The ADP3820 is a precision single cell Li-Ion battery charge
controller that can be used with an external Power PMOS de-
vice 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 µA) and easy
charge current programming make this device especially attrac-
tive as a battery charge controller.
Charge current can be set by an external resistor. For example,
50 mof resistance can be used to set the charge current to
1 A. Additional features of this device 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 elimi-
nates 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.
VIN
+5V
C1 +
10F –
R1
10k
RS
50m
NDP6020P
IS
GATE
VIN
VOUT
ADP3820-xx
SD
GND
IO = 1A
VOUT
Li-Ion
BATTERY
22F
Figure 1. Li-Ion Charger Application Circuit
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
 

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