MAX1874ETE ,Dual-Input / USB/AC Adapter / 1-Cell Li+ Charger with OVP and Thermal RegulationELECTRICAL CHARACTERISTICS(V = V = V = V = V = 5V, V = 4.2V, V = V / 2, Circuit of Figure 2, T = 0° ..
MAX1874ETE+ ,Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulationfeatures include a CHG output to indicate whenbattery current tapers below a predetermined level. D ..
MAX1874ETE+T ,Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal RegulationELECTRICAL CHARACTERISTICS(V = V = V = V = V = 5V, V = 4.2V, V = V / 2, Circuit of Figure 2, T = 0° ..
MAX1874ETE-T ,Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal RegulationFeaturesThe MAX1874 charges a single-cell Li+ battery from♦ Charge from USB or AC Adapterboth USB a ..
MAX1875EEG ,Dual 180 Out-of-Phase PWM Step- Down Controllers with PORApplicationsNetwork Power Supplies Pin ConfigurationTelecom Power SuppliesTOP VIEWDSP, ASIC, and FP ..
MAX1875EEG+ ,Dual 180° Out-of-Phase PWM Step-Down Controllers with PORApplicationsNetwork Power Supplies Pin ConfigurationTelecom Power SuppliesTOP VIEWDSP, ASIC, and FP ..
MAX481CSA+T ,Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Low-Power, Slew-Rate-LimitedRS-485/RS-422 Transceivers
MAX481ECPA ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceiversapplications that are not ESD sen-MAX481ECPA 0°C to +70°C 8 Plastic DIPsitive see the pin- and func ..
MAX481ECPA ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsIndustrial-Control Local Area Networks__Selection TableRECEIVER/ QUIESCENT NUMBER OFPAR ..
MAX481ECPA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplications:ceivers on the bus. The MAX488E–MAX491E areMAX3483E/MAX3485E/MAX3486E/MAX3488E/designe ..
MAX481ECSA ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX481ECSA ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversGeneral Description ________
MAX1874ETE
Dual-Input / USB/AC Adapter / 1-Cell Li+ Charger with OVP and Thermal Regulation
General DescriptionThe 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 PC board 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.
ApplicationsPDAsCell 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*. Patent #6,507,172.
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
Ordering Information19-2912; Rev 0; 7/03
Pin Configuration
Functional Diagram appears at the end of the data sheet.ypical 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 otherwiseStresses 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
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
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.)
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
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
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.
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
Typical Operating Characteristics
(VUSB= VDC= VDCLV= VEN= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, VDCI= VREF, VUSEL= 5V, Circuit of Figure 4, TA= +25°C,
unless otherwise noted.)
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
OFF-BATTERY LEAKAGE
vs. USB INPUT VOLTAGE
MAx1874 toc10
VUSB (V)
IBATT OFF 53421
OFF-BATTERY LEAKAGE
vs. DC INPUT VOLTAGE
MAx1874 toc11
VDCIN (V)
IBATT OFF (53421
BATTERY CURRENT AND VOLTAGE
vs. TIME
MAX1874 toc13
TIME (MIN)
IBATT
(A)
BATT
AND V
CHG
(V)
RESPONSE TO OVERVOLTAGE INPUT
USB = 0
MAX1874 toc14
40ms/div
20V/divDC
DCLV
PON
5V/div
5V/div
20V/divDCOK
DC CONNECT WAVEFORMS
VUSB = 0, VBATT = 3.9V
MAX1874 toc15
40ms/div
10V/divDC
DCLV
PON
10V/div
10V/div
1A/div
10V/divDCOK
IBATT
Typical Operating Characteristics (continued)
(VUSB= VDC= VDCLV= VEN= 5V, VBATT= 4.2V, VTHRM= VREF/ 2, VDCI= VREF, VUSEL= 5V, Circuit of Figure 4, TA= +25°C,
unless otherwise noted.)
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
Pin Description
