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ADP3806JRU-12.5-RL-ADP3806JRU-12.6R7
High-Frequency Switch Mode Li-Ion Battery Charger
REV.B
High Frequency Switch Mode
Li-Ion Battery Charger
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
APPLICATIONS
Portable Computers
Fast Chargers
FUNCTIONAL BLOCK DIAGRAM
CS+
CS–
COMPREFAGND
BAT
REG
PGNDVCCBSTDRVHDRVLSYS+SYS–ISYS
ISET
SYNC
LIMIT
BSTREG
BATSEL
GENERAL DESCRIPTIONThe 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 accurately operate under low dropout and short-circuit condi-
tions. 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.
ADP3806–SPECIFICATIONS1
(@ 0�C £ TA £ 100�C, VCC = 16 V, unless otherwise noted.)CURRENT SENSE AMPLIFIER
ISET INPUT
ADP3806BOOST REGULATOR OUTPUT
POWER SUPPLY
OUTPUT REVERSE LEAKAGE
OVERCURRENT COMPARATOR
OVERVOLTAGE COMPARATOR
NOTESAll limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.Guaranteed by design, not tested in production.If SYNC function is used, then fSYNC must be greater than fCT but less than 120% of fCT.VCS = (VCS+) – (VCS–).Accuracy guaranteed by ISET input, programming function accuracy specification.System current sense is active during shutdown.Load current is supplied through SYS+ pin.Guaranteed output current from 0 to min specified value to maintain regulation.VBAT < 93% of final or VCS > 25 mV.VBAT ≥ 93% of final and VCS £ 25 mV.
Specifications subject to change without notice.
ADP3806
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADP3806 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.
ABSOLUTE MAXIMUM RATINGS*Input Voltage (VCC) . . . . . . . . . . . . . . . . . . . –0.3 V to +25 V
BAT, CS+, CS– . . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
SYS+, SYS– . . . . . . . . . . . . . . . . . . . . . . . . . . –25 V to +25 V
BST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +30 V
BST to SW . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +8 V
SW to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . –4 V to +25 V
DRVL to PGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +8 V
ISET, BATSEL, SD, SYNC, CT,
LIMIT, ISYS, LC . . . . . . . . . . . . . . . . . . . –0.3 V to +10 V
COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +3 V
GND to PGND . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +0.3 V
ORDERING GUIDE*Z = Pb-free part.
Operating Ambient Temperature Range . . . . . . 0∞C to 100∞C
�JA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115∞C/W
Operating Junction Temperature Range . . . . . . 0∞C to 125∞C
Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C
Lead Temperature Range (Soldering 10 sec) . . . . . . . . . 300∞C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections 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 are referenced to GND.
PIN CONFIGURATION
PIN FUNCTION DESCRIPTION
PIN FUNCTION DESCRIPTION(continued)
ADP3806–Typical Performance CharacteristicsTPC 1. VBAT Accuracy Distribution
TPC 2. VBAT Accuracy vs. Temperature
TPC 3. VBAT Accuracy vs. VCC
TPC 4. VREF Accuracy vs. Temperature
TPC 5. VREF Accuracy vs. VCC
TPC 6. ON Supply Current vs. VCC
TPC 7. Supply Current vs. Driver Load Capacitance
TPC 8. OFF Supply Current vs. VCC
TPC 9. Oscillator Frequency vs. CT
TPC 10. VLIMIT vs. VISYS
TPC 11. Driver On Resistance vs. Temperature
TPC 12. Driver Waveforms
ADP3806TPC 13. Conversion Efficiency vs. Charge Current
TPC 14. Conversion Efficiency vs. Battery Voltage
TPC 15. Conversion Efficiency vs. Battery Voltage
at Given Temperatures
