ADP3806 ,High-Frequency Switch Mode Li-Ion Battery ChargerSPECIFICATIONSAParameter Conditions Symbol Min Typ Max UnitBATTERY SENSE INPUTADP3806-12.6 V and 16 ..
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ADP3806
High-Frequency Switch Mode Li-Ion Battery Charger
REV.0
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 12.600V/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
Softstart 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 be selected to 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 drop out 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.
ADP3806–SPECIFICATIONS(@ 0�C ≤ TA ≤ 100�C, VCC = 16 V, unless otherwise noted.)BATTERY SENSE INPUT
OSCILLATOR
GATE DRIVE
CURRENT SENSE AMPLIFIER
SYSTEM CURRENT SENSE
ADP3806BATSEL INPUT
BOOST REGULATOR
ANALOG REGULATOR
PRECISION REFERENCE
SHUTDOWN (SD)
POWER SUPPLY
OVERCURRENT
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.
ADP3806
ABSOLUTE MAXIMUM RATINGS*Input Voltage (VCC) . . . . . . . . . . . . . . . . . . . –0.3V to +25 V
BAT, CS+, CS– . . . . . . . . . . . . . . . . . . –0.3 V to VCC +0.3 V
SYS+, SYS– . . . . . . . . . . . . . . . . . . . . . . . . . . . –25 V to +25 V
BST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +30 V
BST to SW . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +8 V
SW to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . –4 V to +25 V
DRVL to PGND . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +8 V
ISET, BATSEL, SD, SYNC, CT,
LIMIT, ISYS, LC . . . . . . . . . . . . . . . . . . . . –0.3V to +10 V
COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +3 V
GND to PGND . . . . . . . . . . . . . . . . . . . . . . .–0.3V to +0.3 V
Operating Ambient Temperature Range . . . . . . 0°C to 100°C
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
*This is a stress rating only, operation these limits can cause the device to be
permanently damaged. Unless otherwise specified, all voltages are referenced to
GND. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
PIN FUNCTION DESCRIPTIONS
ORDERING GUIDE
PIN CONFIGURATION
24-Lead TSSOP
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.
TPC 1.VBAT Accuracy Distribution
TPC 2.VBAT Accuracy vs. Temperature
TPC 3.VBAT Accuracy vs. Supply Voltage
TPC 4.VREF Accuracy vs. Temperature
TPC 5.VREF Accuracy vs. VCC
TPC 6.ON Supply Current vs. VCC
ADP3806TPC 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
