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MAX8808XETA+T ,1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFNFeaturesThe MAX8808X/MAX8808Y/MAX8808Z intelligent, ♦ Stand-Alone Linear 1-Cell Li+ Battery Charger ..
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MAX8808XETA+T
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN
General Description
The MAX8808X/MAX8808Y/MAX8808Z intelligent,
stand-alone constant-current/constant-voltage (CCCV),
thermally regulated linear chargers are designed for
charging a single-cell lithium-ion (Li+) battery. The
MAX8808X/MAX8808Y/MAX8808Z integrate the cur-
rent-sense circuit, MOS pass element, and thermal-reg-
ulation circuitry, and eliminate the reverse-blocking
Schottky diode to create the simplest and smallest
charging solution for handheld equipment.
The MAX8808X 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 MAX8808Y and MAX8808Z elimi-
nate the prequalification state to allow startup into a load
without a battery. Proprietary thermal-regulation circuitry
limits the die temperature when fast-charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
The MAX8808X/MAX8808Y/MAX8808Z achieve high
flexibility by providing an adjustable fast-charge current
with an external resistor. Other features include a bat-
tery charging-status indicator (CHG), an active-low con-
trol input (EN) for the MAX8808X and MAX8808Z
(active-high control input for the MAX8808Y), and an
active-low input power-source detection output (ACOK).
The MAX8808X/MAX8808Y/MAX8808Z accept a
+4.25V to +15V supply, but disable charging when the
input voltage exceeds +7V to protect against unquali-
fied or faulty AC adapters. The MAX8808X/MAX8808Y/
MAX8808Z operate over the extended temperature
range (-40°C to +85°C) and are available in a compact
8-pin thermally enhanced 2mm x 2mm TDFN package
with 0.8mm (max) height.
Applications
Cellular and Cordless Phones
Smartphones and PDAs
Digital Still Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth®Equipment
FeaturesStand-Alone Linear 1-Cell Li+ Battery ChargerNo External FET, Reverse Blocking Diode, or
Current-Sense Resistor RequiredProgrammable Fast-Charge Current (1A max)Proprietary Die Temperature Regulation Control
(+115°C)+4.25V to +15V Input Voltage Range with Input
OVP Above +7VCharge-Current Monitor for Fuel GaugingLow Dropout Voltage—300mV at 500mAInput Power-Source Detection Output (ACOK) and
Charge-Enable Input (ENor EN)Soft-Start Limits Inrush CurrentCharge-Status Output (CHG) for LED or
Microprocessor (µP) InterfaceTiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm
(max) Height
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
PARTPIN-PACKAGETOP
MARK
MAX8808XETA+8 TDFN-EP* 2mm x 2mm (T822-1)AAC
MAX8808YETA+8 TDFN-EP* 2mm x 2mm (T822-1)AAB
MAX8808ZETA+8 TDFN-EP* 2mm x 2mm (T822-1)AAA
Ordering Information
MAX8808X
MAX8808Y
MAX8808Z
4.2V
Li+
4.25V TO 15V
*MAX8808Y USES ACTIVE-HIGH LOGIC FOR EN.
CHG
ISETVL
GND
EN*
BATT
ACOK
OFF
Typical Operating Circuit
19-3670; Rev 0; 4/05
Pin Configuration appears at end of data sheet.
Bluetooth is a registered trademark of Bluetooth SIG.
All devices specified over the -40°C to +85°C operating range.
+Denotes lead-free package.
*EP = Exposed paddle.
EVALUATION KIT
AVAILABLE
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 5V, VBATT= 4.0V, RACOK= RCHG= 100kΩto 5V, EN= unconnected (for the MAX8808X and MAX8808Z), EN = VL (for the
MAX8808Y), RISET= 2.8kΩto GND, CVL= 0.47µF, CBATT= 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 to GND...............................................................-0.3V to +16V
VL, BATT, EN, ACOK, CHGto GND.........................-0.3V to +6V
VL, ISET to GND.......................................................-0.3V to +4V
VL to IN................................................................-16.3V to +0.3V
IN to BATT Continuous Current.............................................1.5A
Continuous Power Dissipation (TA= +70°C)
8-Pin 2mm x 2mm TDFN (derate 15.4mW/°C
above +70°C).............................................................1234mW
BATT 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
PARAMETERCONDITIONSMINTYPMAXUNITS
Input Voltage Range015V
Input Operating Range4.256.50V
VIN rising154060ACOK ThresholdVIN - VBATT, 10mV hysteresis (typ)VIN falling103045mV
Overvoltage-Lockout Trip PointVIN rising, 100mV hysteresis (typ)6.577.5V
Charging (IIN - IBATT)0.82
Disabled0.230.50IN Input Current
OFF state (VIN = VBATT = 4.0V)0.065
VL Output VoltageIVL = 100µA3.0V
VL Load RegulationIVL = 100µA to 2mA-5-30mV
VL Undervoltage-Lockout Trip
PointVVL rising, 100mV hysteresis (typ)2.74V
VIN = 0 to 4V110BATT Input CurrentDisabled110µA
Maximum RMS Charge Current1ARMS
Battery Regulation VoltageIBATT = 1mA4.1624.2004.238V
Minimum BATT Bypass
Capacitance2.2µF/A
Fast-Charge Current Loop
System AccuracyVBATT = 3.5VTA = 0°C to +85°C418465512mA
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Note 1:Specifications are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5V, VBATT= 4.0V, RACOK= RCHG= 100kΩto 5V, EN= unconnected (for the MAX8808X and MAX8808Z), EN = VL (for the
MAX8808Y), RISET= 2.8kΩto GND, CVL= 0.47µF, CBATT= 1µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.)(Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Prequal Charge CurrentPercentage of the fast-charge current, VBATT = 2.2V,
MAX8808X51015%
Die Temperature Regulation
Threshold+115°C
VBATT Prequal Threshold VoltageVBATT rising, MAX8808X2.32.52.7V
Current-Sense Amplifier Gain,
IBATT to IISETIBAT T = 500m A, V IS E T = 1.4V TA = 0°C to +85°C0.971.081.19mA/A
Regulator Dropout Voltage
(VIN - VBATT )VBATT = 4.1V, IBATT = 425mA250430mV
EN/EN Logic Input Low Voltage4.25V < VIN < 6.5V0.52V
EN/EN Logic Input High Voltage4.25V < VIN < 6.5V1.3V
EN Internal Pulldown ResistorMAX8808X and MAX8808Z only100200400kΩ
TA = +25°C1EN Input Leakage CurrentMAX8808Y, VEN = 5.5VTA = +85°C0.002µA
CHG Output Low VoltageI CHG = 5mA0.4V
TA = +25°C1CHG Output High Leakage
CurrentV CHG = 5.5VTA = +85°C0.002µA
ACOK Output Low VoltageI ACOK = 5mA0.4V
TA = +25°C1ACOK Output High Leakage
CurrentV ACOK = 5.5VTA = +85°C0.002µA
Full-Battery Detection Current
ThresholdIBATT falling, percentage of the fast-charge current51015%
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8808X/Y/Z toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)12810462
DISABLED-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8808X/Y/Z toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (12246810
VEN = 5V OR
VEN = 0V
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX8808X/Y/Z toc03
VBATT (V)
CHARGE CURRENT (mA)
MAX8808Y/
MAX8808Z
MAX8808X
Typical Operating Characteristics
(VIN= 5V, VBATT= 4.0V, ACOK= EN= unconnected, RISET= 2.8kΩto GND, CIN= 1µF, CBATT= 1µF, CVL= 0.47µF, TA= +25°C,
unless otherwise noted.)
CHARGE CURRENT
vs. INPUT VOLTAGE
MAX8808X/Y/Z toc04
VIN (V)
CHARGE CURRENT (mA)106842
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
MAX8808X/Y/Z toc05
(VIN - VBAT) (mV)
CHARGE CURRENT (mA)
BATTERY REGULATION VOLTAGE
vs. AMBIENT TEMPERATURE
MAX8808X/Y/Z toc06
TA (°C)
BATTERY REGULATION VOLTAGE (V)3510-15
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX8808X/Y/Z toc07
TA (°C)
CHARGE CURRENT (mA)35-1510
VBATT = 4V
VBATT = 3.2V
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Pin Description
PINNAMEFUNCTION
1INInput Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to improve line
noise and input transient rejection.
2VLInternally Generated Logic Supply for IC. Bypass VL to GND with a 0.47µF ceramic capacitor.GNDGround. Connect GND and exposed pad to a large copper ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.ISET
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 1.08mA
per amp of battery charging current. Set the charging current by connecting a resistor from ISET
to GND. Fast-charge current = 1302V / RISETΩ.CHG
Charging Indicator. CHG is an open-drain output that goes low (LED capable) when charging
begins. CHG is high impedance when the battery current drops below 10% of the fast-charging
current, or when the IC is disabled. Connect a pullup resistor to the µP’s I/O voltage when
interfacing with a µP logic input.
(MAX8808X/
MAX8808Z)
Logic-Level Enable Input. Drive EN high to disable charger. Pull EN low or leave unconnected for
normal operation. EN has an internal 200kΩ pulldown resistor.
(MAX8808Y)
Logic-Level Enable Input. Drive EN low to disable charger. Pull EN high for normal operation. EN
has no internal pullup or pulldown resistor.ACOK
Input Status Indicator. ACOK is an open-drain output that asserts low when VIN < +7V and (VIN –
VBATT) ≥ 40mV. ACOK requires an external 100kΩ pullup resistor. ACOK is high impedance
during shutdown.BATTLi+ Battery Connection. Bypass BATT to GND with a ceramic capacitor of at least 2.2µF per
ampere of charge current.
—EPExposed Paddle. Connect the exposed paddle to a large ground plane for maximum power
dissipation. Connect GND to the exposed paddle directly under the IC.
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
Detailed Description
The MAX8808X/MAX8808Y/MAX8808Z chargers use
voltage, current, and thermal-control loops to charge a
single Li+ cell and protect the battery (Figure1). When
a Li+ battery with a cell voltage below 2.5V is inserted,
the MAX8808X charger enters the prequalification
stage where it precharges that cell with 10% of the
user-programmed fast-charge current (Figure2). The
CHGindicator output is driven low to indicate entry into
the prequalification state. When battery voltage
exceeds 2.5V, the charger soft-starts as it enters the
fast-charge stage. In the MAX8808X/MAX8808Y/
MAX8808Z, the fast-charge current level is pro-
grammed through a resistor from ISET to GND. 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 CHGindicator
goes high impedance, signaling that the battery is fully
charged. The ICs then enter a constant voltage-regula-
tion mode to maintain the battery at full charge.
MAX8808X
MAX8808Y
MAX8808Z
ISET
IREF
CHG
EN (MAX8808Y)
GND
BATT
1μF
ACOK
TEMP
SENSOR
OUTPUT DRIVER, CURRENT
SENSE, AND LOGIC
REF OK
0.47μF
100kΩ
2.8kΩ
VI/O
1μF
4.25V TO 15V
OVP
UVLO
LOGIC
VREF
+115°C
BATT
REF
100kΩ
VI/O
EN
(MAX8808X/
MAX8808Z)
200kΩ
Figure1. Functional Diagram
Thermal Regulation
The thermal-regulation loop limits the MAX8808X/
MAX8808Y/MAX8808Z die temperature to +115°C by
reducing the charge current as necessary. This feature
not only protects the ICs from overheating, but also
allows a higher charge current without risking damage
to the system.(MAX8808X/MAX8808Z) and EN
(MAX8808Y) Charger Enable Input
The MAX8808X/MAX8808Z contain an active-low logic
input (EN) used to enable the charger. Drive ENlow,
leave floating, or connect to GND to enable the
charge-control circuitry. Drive ENhigh to disable the
charger-control circuitry. ENhas a 200kΩinternal pull-
down resistor.
The MAX8808Y contains an active-high enable input
(EN) to enable the charger. Drive EN high to enable the
charge-control circuitry. Drive EN low to disable the
charger-control circuitry. Do not leave EN floating. It
has no internal pullup or pulldown resistor.
ACOKOutput
The open-drain ACOKoutput asserts low when +4.25VVIN≤+7V and VIN- VBATT≥40mV. ACOKrequires
an external pullup resistor (100kΩtyp). ACOKis high
impedance during shutdown.
MAX8808X/MAX8808Y/MAX8808Z
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
ASYNCHRONOUS
FROM ANYWHERE
VIN > 7V OR
VBATT > VIN OR
IC DISABLED
SHUTDOWN
CHARGER = OFF
CHG = HIGH
VIN
< 7V ANDIN > V
BATT
AND
IC ENABLED
VIN < 7V AND
VIN > V
BATT AND
IC ENABLED
FAST-CHARGE
100% CHARGER CURRENT
CHG = LOW
TOP-OFF
CHG = HIGH
TOP-OFF CONTINUES
TO REGULATE BATT AT
4.2V
ICHARGE < 10%
OF ISET
ICHARGE > 20%
OF ISET
PREQUAL
10% CHARGE CURRENT
CHG = LOW
VBATT > 2.5V
VBATT < 2.5V
VBATT < 2.4V
MAX8808X
MAX8808Y/
MAX8808Z
VIN > 7V OR
VBATT > VIN OR
IC DISABLED
Figure2. Charge-State Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8808XETA+T	N/A	N/a	2500	avai	1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN
MAX8808XETA+T \|MAX8808XETAT	MAX	N/a	350	avai	1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN