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ADP3806JRUZ-REEL7 View Datasheet(PDF) - Analog Devices

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Description
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ADP3806JRUZ-REEL7
ADI
Analog Devices ADI
ADP3806JRUZ-REEL7 Datasheet PDF : 16 Pages
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High Frequency Switch Mode
Li-Ion Battery Charger
ADP3806
FEATURES
Li-Ion battery charger
Three battery voltage options
Selectable 12.525 V/16.700 V
Selectable 12.600 V/16.800 V
Adjustable
High end-of-charge voltage accuracy
±0.4% @ 25°C
±0.6% @ 5°C to 55°C
±0.7% @ 0°C to 85°C
Programmable charge current with rail-to-rail sensing
System current sense with reverse input protection
Soft start charge current
Undervoltage lockout
Bootstrapped synchronous drive for external NMOS
Programmable oscillator frequency
Oscillator SYNC pin
Low current flag
Trickle charge
GENERAL DESCRIPTION
The ADP3806 is a complete Li-Ion battery-charging IC. The
device combines high output voltage accuracy with constant
current control to simplify the implementation of constant-
current, constant-voltage (CCCV) chargers.
The ADP3806 is available in three options. The ADP3806-12.6
guarantees the final battery voltage selected is 12.6 V or 16.8 V
± 0.6%. The ADP3806-12.5 guarantees 12.525 V/16.7 V ± 0.6%,
and the ADP3806 is adjustable using two external resistors to
set the battery voltage.
The current sense amplifier has rail-to-rail inputs to operate
accurately under low dropout and short-circuit conditions. The
charge current is programmable with a dc voltage on ISET. A
second differential amplifier senses the system current across an
external sense resistor and outputs a linear voltage on the ISYS
pin. The bootstrapped synchronous driver allows the use of two
NMOS transistors for lower system cost.
APPLICATIONS
Portable computers
Fast chargers
FUNCTIONAL BLOCK DIAGRAM
VCC BST DRVH SW DRVL PGND
1
22
23
24
20
19
CS+ CS–
18 17
SYS+ SYS–
3
2
ISYS
4
BSTREG 21
SD 10
VREF + VREG
UVLO
BIAS
LOGIC
CONTROL
BOOTSTRAPPED
SYNCHRONOUS
DRIVER
SD IN DRVLSD DRVLSD
VREF
+
+
AMP1
VTH
gm1
+
–+
AMP2
2.5V
LC 12
ADP3806
OSCILLATOR
gm2
+
VREF
SELECT
12.6V/16.8V
5 LIMIT
16 ISET
14 BAT
13
8
AGND REG
9
REF
7
SYNC
6
11
CT
COMP
Figure 1.
15
BATSEL
Rev. C
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: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
 

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