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PDF ADP2291 Data sheet ( Hoja de datos )
| Número de pieza | ADP2291 | |
| Descripción | Linear Charger | |
| Fabricantes | Analog Devices | |
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FEATURES
Simple, safe linear charger for single cell lithium battery
4.5 V to 12 V input voltage range
Adjustable charging current up to 1.5 A
Low cost PNP external pass element
Automatic reverse isolation with no external blocking diode
Output overshoot protection
Deep discharge precharge mode
Thermal shutdown
Automatic recharge
Programmable termination timer
LED charging status indicator
4.2 V output voltage with ±1% accuracy over line and
temperature
1 µA shutdown supply current
Small, 8-pin MSOP and 3 × 3 mm LFCSP packages
APPLICATIONS
Wireless handsets
Smart handhelds and PDAs
Digital cameras
Single cell lithium ion-powered systems
Cradle chargers
Compact, 1.5 A Linear Charger
for Single-Cell Li+ Battery
ADP2291
GENERAL DESCRIPTION
The ADP2291 is a constant-current/constant-voltage linear
charger for a single cell lithium ion battery, requiring just a few
components to provide a simple and safe charging system that
operates from a wide 4.5 V to 12 V input voltage range. It
features an internally controlled, multistep charging cycle that
improves battery life.
An external, low cost, PNP provides the charging current to the
battery and an external resistor sets the maximum charge
current. A small external capacitor programs the maximum
charge time. The controller includes an LED driver to indicate
the battery charging status.
Safety features include charging stop mode for battery faults,
output overshoot protection, and thermal shutdown. The
ADP2291 also features automatic reverse isolation, which does
not require an additional blocking diode.
The multistep charge cycle optimizes the battery charging time
in a safe manner. It features a trickle charge mode for a deeply
discharged cell and a fast charging mode with a maximum
current of 1.5 A. The ADP2291 controls the end of charge with
a 4.2 V output voltage that is 1% accurate over line and temp-
erature. It automatically recharges the battery if the cell voltage
drops. When the input supply is removed, the part enters a low
current state and reduces the current drawn from the battery to
below 1 µA.
The ADP2291 is available in both a small, 8-pin MSOP package
and a 3 × 3 mm LFCSP package that is ideally suited for small,
portable applications.
INPUT
4.6V–12V
TYPICAL OPERATING CIRCUIT
RS Q1
CIN COUT
CS DRV
IN
CHG
ADP2291
BAT
GND
TIMER
ADJ
CTIMER
SHUTDOWN
+
Figure 1. Basic Circuit Configuration
Rev. 0
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
IN, DRV1, CS, CHG, to GND
−0.3 V to +13.5 V
BAT, ADJ, TIMER to GND
Operating Ambient Temperature
Operating Junction Temperature
−0.3 V to (VIN + 0.3 V)
−40°C to +85°C
−40°C to +125°C
θJA, 2-layer MSOP-8
θJA, 4-layer MSOP-8
θJA, 2-layer LFCSP-8
θJA, 4-layer LFCSP-8
Storage Temperature
Lead Temperature Range Soldering
(10 sec)
220ºC/W
158ºC/W
62ºC/W
48ºC/W
−65°C to +150°C
300°C
ADP2291
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other condition s above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability. Absolute maximum ratings apply individually
only, not in combination. Unless otherwise specified all other
voltages referenced to GND.
1 Pulling current from the DRV pin by driving it below ground, while VIN is
applied, may cause permanent damage to the device.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 5 of 20
5 Page 
ADP2291
THERMAL SHUTDOWN
In the event that the ADP2291 junction temperature rises above
135°C, thermal shutdown occurs. Extreme junction tempera-
tures may be the result of excessive current operation and/or
high ambient temperatures. A 35°C temperature hysteresis is
IN CS
included so that the ADP2291 does not return to operation
during thermal shutdown until the on-chip temperature drops
below 100°C.
DRV
BAT
ADJ
3V
GM
5V
GM GM
1.2V
VOLTAGE
REFERENCE
0.4V
IN
BAT
IN
3.8V
IPNP
C/10
TEMP
SHUTDOWN
RESTART
VIN_GOOD
POWER_DOWN
CONTROL
LOGIC
PRECHARGE
END_OF_CHARGE
TIMER
TIMER
Figure 20. Functional Block Diagram
BAT
4.1V
BAT
2.5V
CHG
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADP2291.PDF ] | |
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