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MAX1508ETAMAXIMN/a96avaiLinear Li Battery Charger with Integrated Pass FET / Thermal Regulation / and ACOKin 3mm x 3mm TDFN


MAX1508ETA ,Linear Li Battery Charger with Integrated Pass FET / Thermal Regulation / and ACOKin 3mm x 3mm TDFNFeaturesThe MAX1508 is an intelligent, stand-alone constant-cur-  Stand-Alone Linear 1-Cell Li+ Ba ..
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MAX1508ETA
Linear Li Battery Charger with Integrated Pass FET / Thermal Regulation / and ACOKin 3mm x 3mm TDFN
General Description
The MAX1508 is an intelligent, stand-alone constant-cur-
rent, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1508 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also elimi-
nates the reverse-blocking Schottky diode, to create the
simplest and smallest charging solution for hand-held
equipment.
The MAX1508 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full-
charge indication. The MAX1508Y and MAX1508Z elimi-
nate the prequalification state to allow startup into a load
without a battery.
Proprietary thermal-regulation circuitry limits the die
temperature to +100°C when fast charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
The MAX1508 achieves high flexibility by providing an
adjustable fast-charge current by an external resistor.
Other features include the charging status (CHG) of the
battery, an active-low control input (EN) for the
MAX1508 and MAX1508Z (active-high control input for
the MAX1508Y), and an active-low input power-source
detection output (ACOK).
The MAX1508 accepts a +4.25V to +13V supply, but dis-
ables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1508 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
8-pin thermally enhanced 3mm x 3mm thin DFN pack-
age with 0.8mm height.Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
Features
Stand-Alone Linear 1-Cell Li+ Battery ChargerNo External FET, Reverse-Blocking Diode, or
Current-Sense Resistor Required
Programmable Fast-Charge Current (0.8A max)Proprietary Die-Temperature Regulation Control
(+100°C)
+4.25V to +13V Input Voltage Range with Input
Overvoltage Protection (OVP) Above +7V
Charge-Current Monitor for Fuel GaugingLow Dropout Voltage—130mV at 0.425AInput Power-Source Detection Output (ACOK)Soft-Start Limits Inrush CurrentNo Prequalification State for the MAX1508Y and
MAX1508Z
Charge Status Output (CHG) for LED or
Microprocessor Interface
Small 3mm x 3mm 8-Pin Thin DFN Package,
0.8mm High
Active-Low Charge Enable (EN) (MAX1508 and
MAX1508Z)
Active-High Charge Enable (EN) (MAX1508Y)
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN
Pin Configuration

19-2890; Rev 1; 10/03
Bluetooth is a trademark of Ericsson.
Typical OperatingCircuit appears at end of data sheet.
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= 5V, VBATT= 4.0V, ACOK= EN= CHG= unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y), RISET
= 2.8kΩto GND, CVL= 0.47µF, BATT bypassed to GND with 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.)(Note 1)
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, CHGto GND.....................................................-0.3V to +14V
VL, BATT, ISET, EN, EN, ACOKto GND..................-0.3V to +6V
VL to IN...................................................................-14V to +0.3V
IN to BATT Continuous Current.............................................0.9A
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
Short-Circuit Duration.................................................Continuous
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
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN
Note 1:
Limits are 100% production tested at TA= +25°C. Limits over operating temperature range areguaranteed through correla-
tion using statistical quality control (SQC) methods.
ELECTRICAL CHARACTERISTICS (continued)

(VIN= 5V, VBATT= 4.0V, ACOK= EN= CHG= unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y,) RISET
= 2.8kΩto GND, CVL= 0.47µF, BATT bypassed to GND with 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.)(Note 1)
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN
Typical Operating Characteristics

(VIN= 5V, VBATT= 4.0V, ACOK= EN= CHG= unconnected, EN = VL (MAX1508Y), RISET= 2.8kΩto GND, CIN= 1µF, CBATT=
1µF, CVL= 0.47µF, TA= +25°C, unless otherwise noted.)
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN
Detailed Description

The MAX1508 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and to pro-
tect the battery (Figure 1). When a Li+ battery with a cell
voltage below 2.5V is inserted, the MAX1508 charger
enters the prequalification stage where it precharges that
cell with 10% of the user-programmed fast-charge cur-
rent. There is no prequalification stage for the MAX1508Z
and MAX1508Y in order to allow startup into a load with-
out a battery. The CHGindicator output is driven low
(Figure 2) to indicate entry into the prequalification state.
Once the cell has passed 2.5V, the charger soft-starts
before it enters the fast-charge stage. The fast-charge
current level is programmed through a resistor from ISET
to ground. As the battery voltage approaches 4.2V, the
charging current is reduced. If the battery current drops
to less than 10% of the fast-charging current, the CHG
indicator goes high impedance, signaling the battery is
fully charged. At this point the MAX1508 enters a con-
stant voltage-regulation mode to maintain the battery at
full charge. If, at any point while charging the battery, the
die temperature approaches +100°C, the MAX1508
reduces the charging current so the die temperature
does not exceed the temperature-regulation set point.
The thermal-regulation loop limits the MAX1508 die
temperature to +100°C by reducing the charge current
as necessary (see the Thermal Regulationsection).
This feature not only protects the MAX1508 from over-
heating, but also allows higher charge current without
risking damage to the system.
MAX1508/MAX1508ZENCharger
Enable Input
is a logic input (active low) to enable the charger.
Drive ENlow, leave floating, or connect to GND to
enable the charger control circuitry. Drive ENhigh to
disable the charger control circuitry. ENhas a 200kΩ
internal pulldown resistance.
MAX1508Y EN Charger Enable Input

EN is a logic input (active high) to enable the charger.
Drive EN high to enable the charger control circuitry.
Drive EN low to disable the charger control circuitry.
ACOKOutput

Active-Low Output. The open-drain ACOKoutput
asserts low when +4.25V < VIN< +7V and VIN- VBATT
> 40mV. ACOKrequires an external 100kΩpullup
resistor to the system’s logic I/O voltage. ACOKis high
impedance in shutdown.
VL Internal Voltage Regulator

The MAX1508 linear charger contains an internal linear
regulator available on the VL output pin. VL requires a
0.47µF ceramic bypass capacitor to GND. VL is regulat-
ed to 3.3V whenever the input voltage is above 3.5V.
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOKin 3mm x 3mm TDFN

Figure 1. Functional Diagram
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