MAX1898EUB42 Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1898EUB42 ,Linear Charger for Single-Cell Li BatteryApplicationsSingle-Cell Li+ Powered PortablesSelf-Charging Battery PacksTypical Operating CircuitPD ..
MAX1898EUB42 ,Linear Charger for Single-Cell Li BatteryELECTRICAL CHARACTERISTICS(V = 8V, V = 4V, EN/OK = open, RSET = 2.8kΩ , RSTRT = GND, T = 0°C to +85 ..
MAX1898EUB42+T ,Linear Charger for Single-Cell Li+ BatteryELECTRICAL CHARACTERISTICS(V = 8V, V = 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, T = 0°C to +85° ..
MAX189ACPA ,+5V, Low-Power, 12-Bit Serial ADCsapplications, or for circuits where powerMAX187BCWE 0°C to +70°C 16 Wide SO ±1consumption and space ..
MAX189ACWE ,+5V, Low-Power, 12-Bit Serial ADCsMAX187/MAX18919-0196; Rev 0; 10/93+5V, Low-Power, 12-Bit Serial ADCs__________________
MAX189ACWE+ ,+5V, Low-Power, 12-Bit Serial ADCsGeneral Description ____________
MAX4845ELT+T ,Overvoltage Protection Controllers with Low Standby CurrentFeaturesThe MAX4843–MAX4846 overvoltage protection con-♦ Overvoltage Protection Up to 28Vtrollers p ..
MAX4845EYT+TC5Y ,Overvoltage Protection Controllers with Low Standby CurrentELECTRICAL CHARACTERISTICS(V = +5V for MAX4843/MAX4844/MAX4845, V = +4V for MAX4846, C = 500pF, T = ..
MAX4846ELT+ ,Overvoltage Protection Controllers with Low Standby CurrentMAX4843–MAX484619-3649; Rev 5; 12/09Overvoltage Protection Controllers with Low Standby Current
MAX485 ,Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversApplicationsMAX491, and MAX1487 are not limited, allowing them toMAX3460–MAX3464: +5V, Fail-Safe, 2 ..
MAX4850ETE+ , Dual SPDT Analog Switches with Over-Rail Signal Handling
MAX4850HETE+ ,Dual SPDT Analog Switches with Over-Rail Signal HandlingBlock Diagrams/Truth TableMAX4850_MAX4852_MAX4850 MAX4852MAX4850H MAX4852HNC1IN_ NO_ NC_NC13.5ΩCOM1 ..

MAX1898EUB42
Linear Charger for Single-Cell Li Battery
General Description
The MAX1898, with an external PNP or PMOS transistor,
forms a complete charger for 1-cell lithium-ion (Li+) bat-
teries. The MAX1898 provides accurate constant-cur-
rent/constant-voltage charging. Battery regulation voltage
accuracy is ±0.75% for optimum battery performance
and cycle life. Charging current is user set, but is sensed
internally so no external current-sense resistor is needed.
The MAX1898 also provides outputs to monitor charge
status, presence-of-input power source, and charge cur-
rent. Additional features include shutdown, optional
charge-cycle restart without input-power cycling, selec-
table charge termination safety timer, and low-current
preconditioning for deeply discharged cells.
The MAX1898 offers the maximum integration and func-
tionality in the smallest, most basic application circuit
possible. Very few external components are required.
The MAX1898 offers two versions to safely charge all
Li+ battery chemistries. The battery regulation voltage
is 4.2V for the MAX1898EUB42 and 4.1V for the
MAX1898EUB41. Both are available in a 10-pin ultra-
thin µMAX package.
FeaturesSimple, Safe Linear ChargerUses Low-Cost PNP or PMOS Pass Element4.5V to 12V Input RangeInternal Current-Sense Resistor±0.75% Voltage AccuracyProgrammable Charging CurrentAutomatic Input Power-Source DetectionLED Charge Status IndicatorProgrammable Safety TimerCurrent-Sense Monitor OutputOptional/Adjustable Auto-RestartSmall µMAX Package
MAX1898
Linear Charger for Single-Cell Li+ Battery
Ordering Information
Typical Operating Circuit
19-2295; Rev 0; 1/02
Pin Configuration
Applications
Single-Cell Li+ Powered Portables
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
MAX1898
Linear Charger for Single-Cell Li+ Battery
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 8V, VBATT= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, TA= 0°C to +85°C, unless otherwise noted. Typical values are
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, DRV, CS, CHGto GND.....................................-0.3V to +14V
BATT, EN, ISET, RSTRT, CT to GND........................-0.3V to +6V
DRV to IN................................................................-14V to +0.3V
IN to CS Current....................................................................±2A
DRV Continuous Current..................................................±10mA
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)..........444mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s)....................………..+300°C
MAX1898
Linear Charger for Single-Cell Li+ Battery
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 8V, VBATT= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, TA= 0°C to +85°C, unless otherwise noted. Typical values are
at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
MAX1898
Linear Charger for Single-Cell Li+ Battery
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 8V, VBATT= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, TA= -40°C to +85°C, unless otherwise noted.)
MAX1898
Linear Charger for Single-Cell Li+ Battery
NORMALIZED TIMER PERIOD
vs. TEMPERATURE
MAX1898 toc01
TEMPERATURE (°C)
TIMER PERIOD-153560
NORMALIZED BATT REGULATION
VOLTAGE vs. TEMPERATURE
MAX1898 toc02
TEMPERATURE (°C)
BATT REGULATION VOLTAGE-153560
PRECHARGE CURRENT
vs. INPUT VOLTAGE
MAX1898 toc03
VIN (V)
PRECHARGE CURRENT (mA)967101112
NORMALIZED BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX1898 toc04
BATTERY VOLTAGE (V)
NORMALIZED BATTERY CURRENT
VOLTAGE-LOOP GAIN
MAX1898 toc05
FREQUENCY (kHz)
GAIN (dB)
PHASE (deg.)
Typical Operating Characteristics
(VIN= 5V, VBATT= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, TA= +25°C, unless otherwise noted.)
MAX1898
Detailed Description
The MAX1898 forms a complete charger for 1-cell Li+
batteries. It includes precision voltage control (±0.75%)
to optimize both cell performance and cycle life.
Factory-set 4.2V (MAX1898EUB42) and 4.1V
(MAX1898EUB41) versions charge all common Li+
chemistries. Externally selectable charge current is
sensed internally, eliminating the need for a current-
sense resistor. The charger also supplies outputs that
indicate charge status (CHG), the presence of input
power (EN/OK), and charge-current magnitude (ISET).
Other features include a shutdown control input
(EN/OK), selectable threshold for charge-cycle restart
without cycling input power (RSTRT), and a selectable
charge termination safety timer. See Figure 1.
The MAX1898 initiates fast charge when any of these
conditions are met (see Figure 6):An external power source is connected AND the cell
voltage is above 2.5V.The cell voltage falls to the restart threshold, 4.0V in
the MAX1898EUB42, or 3.9V for the MAX1898EUB41.The IC is reset by driving the EN/OK pin low and
then high again.The prequalification cycle ends with the cell reaching
2.5V.
Li+ cells can be damaged when fast-charged from a
completely dead state. A fully discharged cell may indi-
cate an abnormal cell condition. As a built-in safety fea-
ture, the MAX1898 prequalifies the cell with 10 percent
of the user-programmed fast-charge current at the start
of a charge cycle. When the cell voltage rises to 2.5V,
the MAX1898 begins fast-charging.
Current-Limit Mode
The MAX1898 regulates charging current by linearly
controlling an external PMOS or PNP transistor. The
maximum charging current is programmed by an exter-
nal RSET resistor connected from ISET to GND. Select
the RSET value based on the following formula:
where:
IFASTCHGis in amps and RSET is in ohms.
The ISET pin may also be used to monitor the actual
charging current at any time. The output current from
Linear Charger for Single-Cell Li+ Battery
Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX1898EUB42	MAX	N/a	15	avai	Linear Charger for Single-Cell Li Battery
MAX1898EUB42	MAXIM	N/a	486	avai	Linear Charger for Single-Cell Li Battery