MAX8895Y Li-Ion Chargers Datasheet

MAX8895Y Datasheet, PDF, Equivalent


Part Number

MAX8895Y

Description

Li-Ion Chargers

Manufacture

Maxim Integrated

Total Page 30 Pages
Datasheet
Download MAX8895Y Datasheet


MAX8895Y
EVALUATION KIT AVAILABLE
MAX8895V/MAX8895W/
MAX8895X/MAX8895Y
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
General Description
The MAX8895_ USB-compliant linear battery chargers
operate from either a USB port or dedicated charger with
automatic detection of adapter type and USB enumera-
tion capability. The MAX8895_ integrate the battery dis-
connect switch, current-sense circuit, MOSFET pass ele-
ments, and thermal regulation circuitry, and eliminate the
external reverse-blocking Schottky diode to create the
simplest and smallest stand-alone charging solutions.
The MAX8895_ includes an automated detection of
charge adapter type, making it possible to distinguish
between USB 2.0 device, USB charger, and dedicated
charger devices. Furthermore, the MAX8895_ include a
USB enumeration function that automatically negotiates
with a USB host, making it possible to achieve the highest
current available from a USB 2.0 device or USB charger
without processor intervention. The adapter type detec-
tion is compliant with USB 2.0 specification as well as USB
charging Revision 1.1.
The MAX8895_ controls the charging sequence for single-
cell Li+ batteries from initial power-OK indication, through
prequalification, fast-charge, top-off, and finally charge
termination. Charging is controlled using constant cur-
rent, constant voltage, and constant die-temperature
(CCCVCTj) regulation for safe operation under all condi-
tions. The maximum charging current is adaptively con-
trolled by subtracting the system current from the input
current limit, ensuring that the charging current is always
maximized for any given operating condition.
The MAX8895_ features optimized smart power control
to make the best use of limited USB or adapter power.
Battery charge current is set independently of the
SYS_ input current limit. Power not used by the system
charges the battery. Automatic input selection switches
the system from battery to external power. This allows
the application to operate without a battery, discharged
battery, or dead battery.
Other features include undervoltage lockout (UVLO),
overvoltage protection (OVP), charge status flag, charge
fault flag, power-OK monitor, battery thermistor monitor,
charge timer, and a 3.3V output.
The MAX8895_ operates from a +4.0V to +6.6V sup-
ply and include overvoltage protection up to +16V. The
MAX8895_ is specified over the extended temperature
range (-40NC to +85NC) and are available in a compact
2.36mm x 2.36mm, 25-bump WLP package (0.4mm pitch).
Features
S Enables Charging from a USB Port*
S Automatic Detection of Adapter Type
S Enumeration Capability Without Processor
Intervention
S USB Low-Speed Operation Without External
Crystal (MAX8895V/MAX8895W/MAX8895X)
S USB Full-Speed Operation Using an External
Crystal (MAX8895Y)
S Compliant with USB 2.0 Specification
S Compliant with USB Charging Specification
(Revision 1.1)
S Adaptive Input Current Limit for Dedicated
Charger
S Input Overvoltage Protection to 16V
S Automatic Current Sharing Between Battery
Charging and System
S Smart Power SelectorK Allows Operation with
Discharged or No Battery
S NTC Monitoring of Battery Temperature
S No External MOSFETs Required
S Thermal Regulation Prevents Overheating
S 2µA Shutdown Current
S Tiny 2.36mm x 2.36mm, 25-Bump, 0.4mm Pitch
WLP Package
Bluetooth® Headsets
Charging Cradles
Portable Devices
Applications
Ordering Information and Typical Operating Circuit appear
at end of data sheet.
Bluetooth is a registered trademark of Bluetooth SIG.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
*Protected by US Patent #6,507,172.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5205; Rev 4 9/12

MAX8895Y
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
ABSOLUTE MAXIMUM RATINGS
BUS_ to AGND....................................................-0.3V to +16.0V
IBUS_, IBAT_, and ISYS_ Continuous Current............ 1800mARMS
XIN, XOUT, INT_3V3 to AGND..............................-0.3V to +4.0V
ENU_EN, SUS_EN, RWU, D+, D-, PREQ, CHG, UOK,
Continuous Power Dissipation (TA = +70NC)
25-Bump, 2.36mm x 2.36mm WLP
FLT, BAT_, SYS_, CEN, STDBY, DET_DONE,
(derate 19.34mW/NC above +70NC)...........................1560mW
IBUS_DEF, CHG_TYPE to AGND......................-0.3V to +6.0V
Operating Temperature....................................... -40NC to +85NC
KB_TM, ISET, THM, IDN,
Junction Temperature......................................................+150NC
CT to AGND.................................... -0.3V to (VINT_3V3 + 0.3V)
DGND to AGND...................................................-0.3V to + 0.3V
Storage Temperature Range............................. -65NC to +150NC
Soldering Temperature (reflow).......................................+260NC
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.
ELECTRICAL CHARACTERISTICS
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
USB-TO-SYS PREREGULATOR
USB Operating Range
Initial VBUS_ voltage before enabling charger
4.0
6.6 V
USB Standoff Voltage
VBAT_ = VSYS_ = 0V, IBUS_ < 650FA (max)
14 V
BUS_OK Debounce Timer
tUSB_DB
Time from BUS_ within valid range until UOK
logic-low
500 650
ms
UOK logic-low,
VBUS_ rising,
100mV hysteresis
Before initial detection of
external device
3.85
4.0
4.15
USB Undervoltage Lockout
Threshold
UOK logic-low,
VBUS_ falling
UOK logic-low,
VBUS_ falling
USB 2.0 low-power
device
USB 2.0 high-power
device
3.75 3.9 4.05
3.95 4.1 4.25
V
UOK logic-low,
VBUS_ falling
Dedicated charger or
USB charger
VSYS_ VSYS_ VSYS_
-100mV + 50mV + 200mV
USB Overvoltage Protection
Threshold
UOK logic-low, VBUS_ rising, 100mV
hysteresis
6.8 6.95 7.1
V
IDETECT
Charge type detection,
ISYS_ = IBAT_ = 0mA,
VCEN = 0V
MAX8895V/
MAX8895W/
MAX8895X
MAX8895Y
0.5
2.5
USB Input Supply Current
(Note 2)
IENUMERATE
USB 2.0 enumeration in progress,
ISYS_ = IBAT_ = 0mA, VCEN = 0V
ISUSPEND
Suspend mode, ISYS_ = IBAT_ =
0mA, VSTDBY = 3.3V
MAX8895V/
MAX8895W/
MAX8895X
100
mA
0.5
MAX8895Y
2.5
IUSB_100mA
IUSB_500mA
USB 2.0 low-power TA = 0NC to +85NC
device detected
TA = -40NC to +85NC
USB 2.0 high-power device detected
100
102.5
500
USB Input Current Limit
ISUS
IENU
IUSB_LP
IUSB_HP
During suspend
During USB enumeration
USB 2.0 low-power device detected
USB 2.0 high-power device detected
0
40 45 55
80 90 98
460 475 490
mA
2   Maxim Integrated


Features EVALUATION KIT AVAILABLE MAX8895V/MAX88 95W/ MAX8895X/MAX8895Y Li-Ion Chargers with Smart Power Selector, Adapter Typ e Detection, and USB Enumeration Gener al Description The MAX8895_ USB-complia nt linear battery chargers operate from either a USB port or dedicated charger with automatic detection of adapter ty pe and USB enumeration capability. The MAX8895_ integrate the battery disconne ct switch, current-sense circuit, MOSFE T pass elements, and thermal regulation circuitry, and eliminate the external reverse-blocking Schottky diode to crea te the simplest and smallest stand-alon e charging solutions. The MAX8895_ incl udes an automated detection of charge a dapter type, making it possible to dist inguish between USB 2.0 device, USB cha rger, and dedicated charger devices. Fu rthermore, the MAX8895_ include a USB e numeration function that automatically negotiates with a USB host, making it p ossible to achieve the highest current available from a USB 2.0 device or USB charger without processo.
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