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ST3S01PHD-ST3S01PHD-TR
BATTERY CHARGE I.C.
1/17September 2003 DEDICATED I.C. FOR1 LI-ION CELL OR3
NI-MH CELLS 5 DIFFERENT OPERATING MODES 150 mA PRECHARGE CURRENT VERY LOW DROP CHARGE SWITCH
(130mV@ 800mA) VERY LOW DROP REVERSE SWITCH
(130mV@ 800mA) 5.7V OVER BATTERY OVER VOLTAGE
PROTECTION CHARGER DETECTION MODE (V CHARGE-V BATT )DETECTION MODE
DESCRIPTIONThis specification describesa dedicated I.C.
which allowsto charge1 Lilon cellor3 Nimh cells.
The principle usedto charge the batteriesis the
pulsed current, the monitoringis operatedby the
micro-controller of the application. This IC
integrates one Power Switch and achieves the
charge batteriesin two different modes chargeor
precharge.
Oneof this operating mode (chargeor precharge)
canbe selectedina staticor pulsed wayby oneI/ froma micro-controller. The IC can supply
powerto accessories controlled by this I.C.in
Reverse mode. The I.C.is availablein the smaller
and surface mounted SO-8 (exposed pad version)
package.
ST3S01PHDBATTERY CHARGE I.C.
SCHEMATIC DIAGRAM
ST3S01PHD2/17
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
(*) TheI.C.is automatically turned OFF when VCHARGE reaches typically 14V (VCHARGE rising edge); typical hysteresisis 700mV (VCHARGE
falling edge)
THERMAL DATA
ORDERING CODES
CONNECTION DIAGRAM (top view)
ST3S01PHD3/17
PIN DESCRIPTION
OPERATING MODE
ST3S01PHD4/17
I.C. BLOCK DIAGRAM
POSSIBLE OPERATING MODESFive different operating modes are allowed:
charge, precharge, reverse, charge+reverse and
precharge+reverse. These operating modes can achieved by properly selection of the
CMD-REVERSE CMD-PWM and CMD-MODE
(See POSSIBLE OPERATING MODE Table).
PRECHARGE MODEThe PRECHARGE functionis composed bya
switch anda 100mA current source which fully
works forV CHARGE higher than 2.5V. When the
CMD-MODE and the CMD-PWM are not leaded
the switchis ON, being the input states heldbyan
internal pull down resistor. Thisis used when the
batteryis strongly discharged.In this caseV BATTcan be null (battery empty) andall the input pins
are not held by any level (because the
micro-controlleris down), except theV CHARGE pin
whichisa main supply. The sourceof current
suppliesa constant current into the batterytillits
voltage level reaches the required level allowingto
start the micro-controller (typically 3V). The
current directionis from VCHARGEto VBATT.The
reverse leakage current when the switchis ON
mustbe null; thisis obtained thankstoan internal
circuitry that switch OFF the internal P-MOS when
the VBATTis higher than VCHARGE,whatever the
statusof the CMD-MODE. The precharge function also usedto adjust the mean current. When the
ST3S01PHD5/17
batteryis fully charged the current into the battery
has nottobe more than C/25 (Nimh battery).In
orderto perform finely this, the CMD-PWM pin
must be driven with PWM function (in the same
time, the CMD-MODE mustbe kept low). The duty
cycle allowsto adjust the mean current needed.
CHARGE MODETheCMD-MODE pin, whenhigh(and CMD-PWM
low), handles the switchin charge mode. This
switch allows the battery charge witha strong
current. The dropof this internal P-Channel MOS very low (200mV@ 800mA)in orderto optimize
the efficiencyof the charge.
The switchis not internally protected against short
circuitor overcurrent condition.
When the switchis ON (CMD-MODE high and
CMD-PWM low), the current direction into the chip fromV CHARGEtoV BATT. The reverse current
when the switchis ON must be null; thisis
obtained by mean of an internal circuitry that
switch OFF the internal P-MOS when theV BATTis
higher thanV CHARGE, whatever the statusof the
CMD-MODE. When the CMD-MODE pinis lowor high impedance the switchis OFF, whileitis ON
when the signalon that pinis high.
REVERSE MODEWhen the reverse function is selected by
CDM-REVERSE pin, the switch allowsto supply
the accessories witha strong current. The dropof
the internal P-Channel MOSis very low (200mV 800mA) and the switch properly workforV BATThigher than 2.5V. This allowsto supply energyon
the VCHARGE pin. When the switch is ON
(CMD-REVERSE high) the current direction into
thechipis fromV BATTtoV CHARGE.
The reverse current (from VCHARGE to VBATT)
when the switchis ON must be null; thisis
obtained by mean of an internal circuitry that
switch OFF the internal P-MOS when the
VCHARGEis higher than VBATT, whatever the
statusof the CMD-REVERSE. When the levelof
CMD-REVERSE pinis loworin high impedance,
the switchis OFF, whileitis ON when the signal CMD-REVERSE pinis high.
OVERVOLTAGE PROTECTIONThis function allowsto held the switches OFF
when the voltage level onV BATTis higher thana
maximum voltage whatever are the values of
CMD-PWM, CMD-MODE and CMD-REVERSE.
This maximum voltageis shownin the electrical
characteristic (typical threshold 5.7V). From the
momentin which the o.v.protectionis activated,it
will be possibleto turn ON again the switch only
when theV CHARGE value decreases downto 2.5V
typically,it doesn't matter which operation modeis
selected. The protection works only when the
batteryis in charge or precharge mode, i.e. CHARGE >V BATT.
This represents,in fact, the typical application
condition where the battery could increase its
value, i.e. When chargeor precharge mode are
used.
CHARGER DETECTION MODEThis function allowsto generatea digital signal
(CHARGER-OK) to indicateif the V CHARGEvoltageis higher than 2.5V and the reverse
functionis inactive. This functionality allowsto
determineif the chargeris presentor not;if the
VCHARGE is lower than the 2.5V, the
CHARGER-OK goes into high impedance (open
drain). When the reverse functionis active, this
open drain have the VCHARGE-VBATT information.
This circuitryis directly supplied fromV CHARGE pin
and works onlyforV CHARGE higher than 2.2V.
CHARGE-V BATT DETECTION MODEThis function allowsto generatea digital signal CHARGE-V BATT )flagtoindicateif theV CHARGEvoltageis higher than VBATT;if the VCHARGEis
lower than the VBATT, this open drain goes into
high impedance state. This circuitryis directly
supplied from VCHARGE pin and works only for
VCHARGE higher than 2.2V.
THERMAL PROTECTION internal thermal shutdown circuitry will switch
OFF the P_MOS, onlyin prechargeorin charge
mode, when the junction temperature reaches
typically 180°C. This has been implementedin
orderto protect the device from overburning. 20°C thermal hysteresis will avoid a thermal
oscillation.
This circuitryis supplied from VCHARGE and, so,
acts onlyon the precharge and charge switches.
ESD PROTECTIONBoth VCHARGE and VBATT pins are protected
against electrostatic discharge upto ±4KV (HBM,
MIL STD 833D.
CHARGE VOLTAGEVCHARGE functional operating rangeis from 2.5V 12V.AtVCHARGE=14V typically the I.C.is
automatically turned OFF and remains OFFupto
16V.AV CHARGE voltage higher than 16V can
damage the IC.
ST3S01PHD6/17
POSSIBLE OPERATING MODE
ELECTRICAL CHARACTERISTICS OF REVERSE SWITCH(TA= -40to 85°C, unless otherwise
specified.)
ST3S01PHD7/17
ELECTRICAL CHARACTERISTICS OF PRECHARGE SWITCH(TA= -40to 85°C, unless otherwise
specified.)
ST3S01PHD8/17
ELECTRICAL CHARACTERISTICS OF CHARGE SWITCH(TA= -40to 85°C, unless otherwise
specified.)
ELECTRICAL CHARACTERISTICS OF CMD-PWM LOGIC PIN(TA =-40to 85°C,V CHARGE= 2.5to 9V
unless otherwise specified.)
ST3S01PHD9/17
ELECTRICAL CHARACTERISTICS OF CHARGER DETECTION BLOCK(TA= -40to 85°C,
VCHARGE =2.2to 9V, VCMD-REVERSE= 0Vor floating unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF FLAG DETECTION BLOCK(TA =-40to 85°C,V CHARGE =2.2 9V unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF OVERLOAD PROTECTION(TA =-40to 85°C,V CHARGE >3V,
VCHARGE>VBATT,VCMD-REVERSE=0V, VCMD-PWM=0V, VCMD-MODE=0Vto 1.9V, unless otherwise
specified.)
