MAX1874ETE+-MAX1874ETE+T-MAX1874ETE-T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX1874ETE+-MAX1874ETE+T-MAX1874ETE-T
Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation
General Description
The MAX1874 charges a single-cell Li+ battery from
both USB and AC adapter sources. It also includes bat-
tery-to-input power switchover, so the system can be
powered directly from the power source rather than
from the battery.
In its simplest application, the MAX1874 needs no
external MOSFET or diodes, and accepts input volt-
ages up to 6.5V; however, DC input overvoltage protec-
tion up to 18V can be added with a single SOT PFET.
On-chip thermal limiting simplifies printed circuit board
(PCB) layout and allows optimum charging rate without
the thermal limits imposed by worst-case battery and
input voltage. When the MAX1874 thermal limit is
reached, the charger does not shut down but simply
reduces charging current.
Ambient or battery temperature can be monitored with
an external thermistor. When the temperature is out of
range, charging pauses.
Other features include a CHGoutput to indicate when
battery current tapers below a predetermined level. DC
power-OK (DCOK), USB power-OK (UOK), and power-
on (PON) outputs indicate when valid power is present.
These outputs drive logic or power-selection MOSFETs
to disconnect the charging sources from the load and
to protect the MAX1874 from overvoltage.
The MAX1874 contains no logic for communication with
the USB host. It must receive instructions from a local
microcontroller. The MAX1874 is available in a 16-pin
5mm ✕5mm thin QFN package and operates over the
-40°C to +85°C temperature range.
Applications
PDAsCell Phones
Wireless AppliancesDigital Cameras
FeaturesCharge from USB or AC AdapterAutomatic Switchover to AC Adapter Thermal Limiting Simplifies Board DesignSmall, High-Power 16-Pin Thin QFN PackageInput Protection Up to 18VSoft-StartAutomatic Battery-to-Input Load Switch
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
Ordering Information
19-2912; Rev 1; 2/07
EVALUATION KIT
AVAILABLEPART TEMP RANGE PIN-
PACKAGEPKG
CODE
MAX1874ETE-40°C to +85°C16 Thin QFN
5mm x 5mmT1655-2151413
DCOKBATTPONUOK
REF
PGND
BYP
USB
USEL
CHG
DCLV
GND
DCI
THRM
MAX1874
THIN QFN
5mm x 5mm
TOP VIEW
Pin Configuration
Functional Diagram appears at the end of the data sheet.
MAX1874
USB INPUT
DC INPUT
TO REF
DCLV
GND
BATT
NTC
THERMISTOR
PON
REF
THRM
USB
Li+
CELL
USEL500mA
100mADCI
PGNDBYP
REGULATOR
UOK
CHG
DCOK
Typical Operating Circuit
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VUSB= VDC= VDCLV= VEN= VUSEL= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, Circuit of Figure 2, TA= 0°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.)
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.
DC, DCOKto GND.................................................-0.3V to +20V
DCLV, BYP, USB, UOK, DCI, REF, USEL, THRM,
EN, BATT, CHG, PON to GND.............................-0.3V to +7V
PGND to GND.......................................................-0.3V to +0.3V
Continuous Current (DCLV)..................................................1.1A
Continuous Current (USB)....................................................0.6A
Continuous Power Dissipation (TA= +70°C)
16-Pin 5mm ✕5mm Thin QFN
(derate 21.3mW/°C above +70°C)...................................1.7W
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Maximum Junction Temperature.....................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT VOLTAGE RANGES AND INPUT CURRENT
Maximum DC Input Voltage with
Overvoltage Protection
Q2 input MOSFET must be in place; charging
occurs only below 6.2V, Figures 3, 4, and 518V
Maximum DC Input Voltage Without
Overvoltage Protection
DC = DCLV, Q2 input MOSFET not on circuit,
Figure 26.5V
Maximum Input Voltage for Charging6.06.26.5V
VEN = 0V24DC Supply CurrentVEN = 5V46mA
DCLV Operating Voltage Range4.356.00V
DCLV Shutdown Supply CurrentVEN = 0V300500µA
USB Input Voltage Range4.356.50V
VEN = 0V500750µA
VEN = 5V, VDC = 0V23mAUSB Supply Current
VEN = 5V, VDC = 5V160300µA
DCI Input Current1100nA
BYP Output Resistance(Note 1)5Ω
THRM Input Bias Current1100nA
BATTERY VOLTAGE
BATT Regulation Voltage4.16854.204.2315V
BATT Prequal Voltage ThresholdBATT rising2.833.2V
Prequal Threshold Hysteresis70mV
IUSB = 100mA100USB Charging HeadroomIUSB = 500mA200mV
DC Charging HeadroomIDCIN = 800mA250mV
REF Voltage (Buffered Output)IREF = 0 to 500µA, 4V < VDC or VUSB < 6.5V;
does not affect BATT regulation accuracy2.9433.06V
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
ELECTRICAL CHARACTERISTICS (continued)
(VUSB= VDC= VDCLV= VEN= VUSEL= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, Circuit of Figure 2, TA= 0°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
BATTERY CHARGING AND PRECHARGE CURRENT
DCI Voltage Range0.1 x VREFVREFV
VDCI = VREF95010001050DCI Voltage to BATT CurrentVDCI = VREF / 2490520550mA
USEL = high455495USB Charging CurrentUSEL = low8295mA
Soft-Start Current-Ramp TimeMeasured from 10% to 90%7ms
Prequal Charging CurrentVBATT = 2.5V355570mA
BATT Input CurrentNo DC or USB power, VBATT = 4.2V57.5µA
BATT Shutdown CurrentEN = GND, USB- and/or DC-powered12µA
THERMISTOR MONITOR AND DIE-TEMPERATURE REGULATION
THRM COLD Trip Level(Note 2)0.720.740.76VREF
THRM HOT Trip Level(Note 2)0.280.290.30VREF
THRM Disable Threshold50100150mV
Internal Die Thermal Limit+105°C
LOGIC INPUT/OUTPUTS AND GATE DRIVERS
PON High Output ResistancePON pulled up to active input (DCLV or USB),
VDCLV or VUSB = 5V25Ω
PON Low Output ResistancePON resistance to GND, VDCLV = VUSB = 0120kΩ
DCOK Low Output ResistanceDCOK pulled low25Ω
DCOK Off-Leakage CurrentV DCOK = 12V, VDC = 0V1µA
UOK Output ResistanceUOK resistance to GND, VDC = 025Ω
UOK Off-Leakage CurrentV UOK = 6.5V1µA
DC input (% of charge current set at DCI)812.519S B i np ut, U S E L = 5V ( % of U S B char g i ng cur r ent) 202530CHG Threshold to Indicate Battery Full,
Battery Current Falling (Note 3)
USB input with USEL = 0Voltage
mode
CHG Logic-Low OutputSinking 10mA sink0.4V
CHG Leakage CurrentV CHG = 6.5V1µA
EN, USEL Logic-Input High Level1.6V
EN, USEL Logic-Input Low Level0.4V
EN, USEL Input Bias Current1µA
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
ELECTRICAL CHARACTERISTICS (continued)
(VUSB= VDC= VDCLV= VEN= VUSEL= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, Circuit of Figure 2, TA= 0°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
TIMING
DC Rising to DCOK FallingUSB = open, DC rising to 5V20ms
USB Rising to UOK FallingDC = open, USB rising to 5V20ms
DC Falling to DCOK Going
Open-Drain Propagation DelayUSB = open, 1kΩ pullup2µs
USB Falling to UOK Going
Open-Drain Propagation DelayDC = open, 10kΩ pullup2µs
DC Rising to PON Rising (90%)USB = open, DC step to 5V, BATT = 3.6V,
100kΩ pulldown20ms
USB Rising to PON Rising (90%)DC = open, VUSB step to 5V, VBATT = 3.6V,
100kΩ pulldown20ms
DC Falling to PON Going
Open-Drain Propagation DelayUSB = open, 100kΩ pulldown2µs
USB Falling to PON Going
Open-Drain Propagation DelayDC = open, 100kΩ pulldown2µs
ELECTRICAL CHARACTERISTICS
(VUSB= VDC= VDCLV= VEN= VUSEL= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, Circuit of Figure 2, TA= -40°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 4)
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT VOLTAGE RANGES AND INPUT CURRENT
Maximum DC Input Voltage with
Overvoltage Protection
Q2 input MOSFET must be in place; charging
occurs only below 6.2V, Figures 3, 4, and 518V
Maximum DC Input Voltage Without
Overvoltage Protection
DC = DCLV, Q2 input MOSFET not on circuit,
Figure 36.5V
Maximum Input Voltage for Charging6.06.5V
VEN = 0V4DC Supply CurrentVEN = 5V6mA
DCLV Operating Voltage Range4.356.00V
DCLV Shutdown Supply CurrentVEN = 0V500µA
USB Input Voltage Range4.356.50V
VEN = 0V750µA
VEN = 5V, VDC = 0V3mAUSB Supply Current
VEN = 5V, VDC = 5V300µA
DCI Input Current100nA
THRM Input Bias Current100nA
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
ELECTRICAL CHARACTERISTICS (continued)
(VUSB= VDC= VDCLV= VEN= VUSEL= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, Circuit of Figure 2, TA= -40°C to +85°C, unless otherwise
noted. Typical values are at TA= +25°C.) (Note 4)
PARAMETERCONDITIONSMINTYPMAXUNITS
BATTERY VOLTAGE
BATT Regulation Voltage4.16854.2315V
BATT Prequal Voltage ThresholdBATT rising2.83.2V
REF Voltage (Buffered Output)IREF = 0 to 500µA, 4V < VDC or VUSB < 6.5V;
does not affect BATT regulation accuracy2.943.06V
BATTERY CHARGING AND PRECHARGE CURRENT
DCI Voltage Range0.1 x VREFVREFV
VDCI = VREF9301070DCI Voltage to BATT CurrentVDCI = VREF / 2490565mA
USEL = high495USB Charging CurrentUSEL = low95mA
Prequal Charging CurrentVBATT = 2.5V4070mA
BATT Input CurrentNo DC or USB power, VBATT = 4.2V7.5µA
BATT Shutdown CurrentEN = GND, USB and/or DC powered2µA
THERMISTOR MONITOR AND DIE-TEMPERATURE REGULATION
THRM COLD Trip Level(Note 2)0.720.76VREF
THRM HOT Trip Level(Note 2)0.280.30VREF
THRM Disable Threshold50150mV
LOGIC INPUT/OUTPUTS AND GATE DRIVERS
DCOK Off-Leakage CurrentV DCOK = 12V, VDC = 0V1µA
UOK Off-Leakage CurrentV UOK = 6.5V1µA
DC input (% of charge current set at DCI)820
CHG Threshold to Indicate Battery Full,
Battery Current Falling (Note 3)USB input, USEL = 5V
(% of USB charging current)2030%
CHG Logic-Low OutputSinking 10mA sink0.4V
CHG Leakage CurrentV CHG = 6.5V1µA
EN, USEL Logic-Input High Level1.6V
EN, USEL Logic-Input Low Level0.4V
EN, USEL Input Bias Current1µA
Note 1:BYP internally connects to the active power input (DCLV or USB). DCLV takes priority if both inputs are powered.
Note 2:These limits guarantee +5°C accuracy with 5% accuracy of thermistor beta (3450 nominal) with 2°C of hysteresis.
Note 3:The CHGoutput does not go high unless charge current is below the indicated threshold (as set by DCI) and the charger is in
voltage-mode operation. In 100mA USB mode, CHGgoes high when the charger transitions from current to voltage mode.
Note 4:Specifications to -40°C are guaranteed by design, not production tested.

Partno	Mfg	Dc	Qty	Available	Descript
MAX1874ETE+ \|MAX1874ETE	MAXIM	N/a	104	avai	Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation
MAX1874ETE+T	MAXIM	N/a	1118	avai	Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation
MAX1874ETE-T \|MAX1874ETET	MAXIM	N/a	870	avai	Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation