MAX1551EZK+-MAX1551EZK+T-MAX1555EZK+-MAX1555EZK+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1555EZK+T ,SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery ChargersApplicationsMAX1551EZK ADRT POK OutputPDAsMAX1555EZK ADRU CHG OutputWireless AppliancesCell PhonesD ..
MAX1556ETB ,16 mA IQ, 1.2 A PWM step-down DC-DC converterELECTRICAL CHARACTERISTICS(V = V = V = 3.6V, T = - 40°C to +85°C. Typical values are at T = +25°C, ..
MAX1556ETB+ ,16µA IQ, 1.2A PWM Step-Down DC-DC ConvertersApplicationsMARKMAX1556ETB+ -40°C to +85°C 10 TDFN-EP* ACQPDAs and Palmtop ComputersMAX1556ETB/V+T ..
MAX1556ETB+T ,16µA IQ, 1.2A PWM Step-Down DC-DC ConvertersFeaturesThe MAX1556/MAX1556A/MAX1557 are low-operating- ♦ Up to 97% Efficiencycurrent (16µA), fixed ..
MAX1557ETB ,16 mA IQ, 1.2 A PWM step-down DC-DC converterFeaturesThe MAX1556/MAX1557 are low-operating-current ♦ Up to 97% Efficiency(16µA), fixed-frequency ..
MAX1557ETB+T ,16µA IQ, 1.2A PWM Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V = V = V = 3.6V, T = -40°C to +85°C. Typical values are at T = +25°C, u ..
MAX4212EUK ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with Enableapplications.' Space-Saving SOT23-5, µMAX, or QSOP PackagesThe MAX4212 comes in a miniature 5-pin S ..
MAX4212EUK ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with EnableELECTRICAL CHARACTERISTICS (V = +5V, V = 0V, EN_ = +5V, R = 2kW to V / 2, V = V / 2, T = T to T , u ..
MAX4212EUK+T ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with Enableapplications).♦ Rail-to-Rail OutputsThese devices require only 5.5mA of quiescent supply♦ Input Com ..
MAX4212EUK-T ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with Enableapplications.♦ High-Output Impedance in Off StateThe MAX4212 comes in a miniature 5-pin SOT23 pack- ..
MAX4213ESA ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with EnableApplicationsRANGE PACKAGEMARKBattery-Powered InstrumentsMAX4212EUK -40°C to +85°C 5 SOT23-5 ABAFVid ..
MAX4213ESA+T ,Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with EnableApplications Ordering InformationBattery-Powered InstrumentsTEMP PIN TOPPARTVideo Line Driver RANGE ..

MAX1551EZK+-MAX1551EZK+T-MAX1555EZK+-MAX1555EZK+T
SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
AVAILABLE
General Description
The MAX1551/MAX1555 charge a single-cell lithium-ion
(Li+) battery from both USB and AC adapter sources.
They operate with no external FETs or diodes, and
accept operating input voltages up to 7V.
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 MAX1551/MAX1555 thermal limits are reached, the
chargers do not shut down, but progressively reduce
charging current.
The MAX1551 includes a POKoutput to indicate when
input power is present. If either charging source is
active, POKgoes low. The MAX1555 instead features a
CHGoutput to indicate charging status.
With USB connected, but without DC power, charge cur-
rent is set to 100mA (max). This allows charging from
both powered and unpowered USB hubs with no port
communication required. When DC power is connected,
charging current is set at 280mA (typ). No input-blocking
diodes are required to prevent battery drain.
The MAX1551/MAX1555 are available in 5-pin thin SOT23
packages and operate over a -40°C to +85°C range.
Applications
PDAs
Wireless Appliances
Cell Phones
Digital Cameras
FeaturesCharge from USB or AC AdapterAutomatic Switchover when AC Adapter is
Plugged InOn-Chip Thermal Limiting Simplifies Board
DesignCharge Status Indicator5-Pin Thin SOT23 Package
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX1551EZK-T-40°C to +85°C5 Thin SOT23-5
MAX1555EZK-T-40°C to +85°C5 Thin SOT23-5
GNDBATUSB
MAX1551(MAX1555)
THIN SOT23
TOP VIEWPOK
(CHG)
Pin Configuration
MAX1551
(MAX1555)
USB
BATAC ADAPTER
3.7V TO 7V
USB
3.7V TO 6V
TO SYSTEM
LOAD
Li+
GND
TO LOGIC RAIL
CHARGE
CONTROL
POK
(CHG)
LOGIC
CONTROL
Typical Operating Circuit
Selector Guide
PARTTOP MARKFEATURES
MAX1551EZKADRTPOK Output
MAX1555EZKADRUCHG Output
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDC= 5V, VUSB= 0, IBAT= 0, CBAT= 1µF, TA = 0°C to +85°C, unless otherwise noted.)
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 to GND......................................................................0 to +8V
DC to BAT.......................................................................0 to +7V
BAT, CHG, POK, USB to GND.................................-0.3V to +7V
Continuous Power Dissipation (TA = +70°C)
5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C)....727mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature Range............................-40°C to +150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
DC Voltage Range(Note 1)3.77.0V
DC to BAT Voltage Range0.16.0V
DC Undervoltage Lockout
ThresholdInput rising, 430mV hysteresis, VBAT = 3V (Note 1)3.753.954.15V
DC Supply Current1.753mA
DC to BAT On-ResistanceVDC = 3.7V, VBAT = 3.6V12Ω
DC to BAT Dropout VoltageWhen charging stops, VBAT = 4V,
DC falling, 200mV hysteresis306090mV
USB
USB Voltage Range(Note 1)3.76.0V
USB Undervoltage ThresholdInput rising, 430mV hysteresis, VDC = 0,
VBAT = 3V (Note 1)3.753.954.15V
USB Supply CurrentVUSB = 5V, VDC = 01.653mA
USB to BAT On-ResistanceVUSB = 3.7V, VBAT = 3.6V, VDC = 024Ω
USB to BAT Dropout VoltageWhen charging stops, VBAT = 4V,
USB falling, 200mV hysteresis, VDC = 0306090mV
BAT
BAT Regulation VoltageVDC or VUSB = 5V4.1584.24.242V
DC Charging CurrentVBAT = 3.3V, VUSB = 0, VDC = 5V220280340mA
USB Charging CurrentVBAT = 3.3V, VDC = 0, VUSB = 5V8090100mA
BAT Prequal ThresholdVBAT rising, 100mV hysteresis2.933.1V
Prequalification Charging CurrentVBAT = 2.8V204080mA
BAT Leakage CurrentVDC = VUSB = 0, VBAT = 4.2V5µA
POK, CHG, AND THERMAL LIMIT
CHG ThresholdCharge current where CHG goes high,
IBAT falling, 50mA hysteresis2550100mA
CHG, POK Logic-Low OutputICHG, IPOK = 10mA150300mV
CHG, POK Leakage CurrentVCHG, VPOK = 6V, TA = +25°C0.0011µA
Thermal-Limit TemperatureCharge current reduced by 17mA/°C above this
temperature+110°C
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Note 1:The input undervoltage lockout has 430mV of hysteresis. The charger turns on when an input rises to 3.95V (typ), and turns
off when it falls below 3.52V.
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS
(VDC= 5V, VUSB= 0, IBAT= 0, CBAT= 1µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETERCONDITIONSMINMAXUNITS
DC Voltage Range(Note 1)3.77.0V
DC to BAT Voltage Range0.16.0V
DC Undervoltage Lockout
ThresholdInput rising, 430mV hysteresis, VBAT = 3V (Note 1)3.754.15V
DC Supply Current3mA
DC to BAT On-ResistanceVDC = 3.7V, VBAT = 3.6V2Ω
DC to BAT Dropout VoltageWhen charging stops, VBAT = 4V, DC falling, 200mV
hysteresis3095mV
USB
USB Voltage Range(Note 1)3.76.0V
USB Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, VDC = 0, VBAT = 3V
(Note 1)3.754.15V
USB Supply CurrentVUSB = 5V, VDC = 03mA
USB to BAT On-ResistanceVUSB = 3.7V, VBAT = 3.6V, VDC = 04Ω
USB to BAT Dropout VoltageWhen charging stops, VBAT = 4V, USB falling, 200mV
hysteresis, VDC = 03095mV
BAT
BAT Regulation VoltageVDC or VUSB = 5V4.1414.259V
DC Charging CurrentVBAT = 3.3V, VUSB = 0, VDC = 5V220340mA
USB Charging CurrentVBAT = 3.3V, VDC = 0, VUSB = 5V80100mA
BAT Prequal ThresholdVBAT rising, 100mV hysteresis2.93.1V
Prequalification Charging CurrentVBAT = 2.8V2080mA
BAT Leakage CurrentVDC = VUSB = 0, VBAT = 4.2V5µA
POK, CHG
CHG ThresholdCharge current where CHG goes high,
IBAT falling, 50mA hysteresis25100mA
CHG, POK Logic-Low OutputICHG, IPOK = 10mA300mV
CHG, POK Leakage CurrentVCHG, VPOK = 6V, TA = +25°C1µA
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Typical Operating Characteristics
(VDC= 5V, VUSB= 0, IBAT= 0, CBAT= 1µF, TA = +25°C, unless otherwise noted.)
CHARGE CURRENT
vs. DC VOLTAGE HEADROOM
MAX1551/55 toc01
DC VOLTAGE HEADROOM (VDC - VBAT) (V)
CHARGE CURRENT (mA)
VBAT = 3.8V, VDC FALLING
CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
MAX1551/55 toc02
USB VOLTAGE HEADROOM (VUSB - VBAT) (V)
CHARGE CURRENT (mA)
VDC = 0, VBAT = 3.8V, VUSB FALLING
DC CHARGE CURRENT
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
DC CHARGE CURRENT (mA)
USB CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX1551/55 toc04
BATTERY VOLTAGE (V)
USB CHARGE CURRENT (mA)
DC CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX1551/55 toc05
TEMPERATURE (°C)
DC CHARGE CURRENT (mA)65554535
VBAT = 3.8V, VDC = 5V
THERMAL LIMIT ACTIVATED
BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE
MAx1551/55 toc06
TEMPERATURE (°C)
BATTERY TERMINATION VOLTAGE (V)6010-15
BAT OPEN
OFF-BATTERY LEAKAGE CURRENT
vs. DC INPUT VOLTAGE
MAX1551/55 toc07
DC OR USB INPUT VOLTAGE (V)
OFF-BATTERY LEAKAGE CURRENT (321
VDC = 0, SWEEPING USB
0 TO 5V OR VUSB = 0,
SWEEPING DC 0 TO 5V
VBAT = 4.2V
USB-TO-DC TRANSITION WAVEFORM
MAX1551/55 toc08
400ms/div
VUSB
5V/div
VDC
5V/div
BATTERY
CURRENT
200mA/div
VPOK
2V/div
MAX1551/MAX1555
Detailed Description
The MAX1551/MAX1555 charge a single-cell Li+ bat-
tery from both USB and AC adapter sources, enabling
portable users to forgo carrying a wall cube. These
devices operate with no external FETs or diodes, and
accept operating input voltages up to 7V.
An internal thermal control loop simplifies PC board lay-
out and allows optimum charging rate without the ther-
mal limits imposed by worst-case battery and input
voltage. When the MAX1551/MAX1555 thermal limits
are reached, the chargers do not shut down, but simply
reduce charging current by 17mA/°C above a die tem-
perature of +110°C.
With USB connected, but without DC power, the charge
current is set to 100mA (max). This allows charging
from both powered and unpowered USB hubs with no
port communication required. When DC power is con-
nected, charging current is set at 280mA (typ). The
MAX1551/MAX1555 do not feature an enable input.
Once power is connected to USB and/or DC, the
charger is on.
When input power is removed, battery leakage current
is less than 5µA. No input-blocking diodes are required
to prevent battery drain. Insert a diode at DC (the
adapter input) if protection from negative voltage inputs
(reversed-polarity adapter plugs) is required.
USB to Adapter Power Handoff
The MAX1551/MAX1555 can charge from either the
USB input or the DC input. The battery does not charge
from both sources at the same time. The MAX1551/
MAX1555 automatically detect the active input and
charge from that. If both power sources are active, the
DC input takes precedence. The switchover between
DC and USB is detailed in Table 1.
MAX1551 Power-OK (POK)
The MAX1551’s POKis an active-low, open-drain out-
put that goes low when VDCor VUSBis above 3.95V.
POKcan be used as a logic output or can drive an
LED. POKindicates the charger is connected to input
power and is charging.
MAX1555 Charge Status (CHG)
The MAX1555’s CHGis an active-low, open-drain
charge status indicator. CHGpulls low when the battery
is charging (whenever USB or DC are powered) and
charge current is greater than 50mA. CHGindicates
when the battery is fully charged by going high imped-
ance when the charger is in voltage mode andcharge
current falls below 50mA. Charging does not stop when
CHGgoes high. CHGis low in precharge mode.
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Pin Description
PINNAMEFUNCTIONUSBUSB Port Charger Supply Input. USB draws up to 100mA to charge the battery. Decouple USB with a 1µF
ceramic capacitor to GND.GNDGround
POKPower-OK Active-Low Open-Drain Charger Status Indicator. POK pulls low when either charger source is
present (MAX1551 only).
CHG
Active-Low Open-Drain Charge Status Indicator. CHG pulls low when the battery is charging. CHG goes to a
high-impedance state, indicating the battery is fully charged, when the charger is in voltage mode and
charge current falls below 50mA. CHG is high impedance when both input sources are low (MAX1555 only).
4DCDC Charger Supply Input for an AC Adapter. DC draws 280mA to charge the battery. Decouple DC with a
1µF ceramic capacitor to GND.BATBattery Connection. Decouple BAT with a 1µF ceramic capacitor to GND.
VDC > 7V OR VUSB > 6VVDC > 3.95V AND
VUSB DON’T CARE
VDC < 3.52V AND
3.95V < VUSB < 6VVDC AND VUSB < 3.52V
Exceeds operating input range. Not allowed. See the
Absolute Maximum Ratings section.
280mA (typ)
charging from DC
100mA (max)
charging from USBUndervoltage lockout
Table 1. USB and DC Input Selection
(VDCtakes precedence when both inputs are present.)
MAX1551/MAX1555
Precharge Current
The MAX1551/MAX1555 feature a precharge current to
protect deeply discharged cells. If VBAT is less than 3V,
the device enters precharge mode where charging cur-
rent is limited to 40mA.
Package Thermal Limiting
On-chip thermal limiting in the MAX1551/MAX1555 sim-
plifies PC board layout and allows charging rates to be
optimized without the limits imposed by worst-case bat-
tery and input voltages. The device reduces the power
dissipation at BAT to prevent overheating. This allows
the board design to be optimized for compact size and
typical thermal conditions. When the MAX1551/
MAX1555 thermal limits are reached, the chargers do
not shut down, but progressively reduce charging cur-
rent by 17mA/°C above a die temperature of +110°C.
Solder the MAX1551/MAX1555s’ GND to a large
ground plane to help dissipate power and keep the die
temperature below the thermal limit. The USB charge
current of 100mA is unlikely to induce thermal limiting.
Bypass Capacitors
Use ceramic bypass capacitors at DC, USB, and BAT.
Mount these capacitors within 1cm of their respective
pins. X7R and X5R dielectrics are recommended.
Chip Information
TRANSISTOR COUNT: 541
PROCESS: BiCMOS
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
MAX1551
(MAX1555)
USB
BATAC ADAPTER
3.7V TO 7V
USB
3.7V TO 6V
TO SYSTEM
LOAD
Li+
GND
TO LOGIC RAIL
CHARGE
CONTROL
POK
(CHG)
LOGIC
CONTROL
1μF
1μF
1μF
100kΩ
INDICATES
THAT POWER
IS PRESENT
(EITHER DC
OR USB)
Typical ApplicationCircuit
MAX1551/MAX1555

Partno	Mfg	Dc	Qty	Available	Descript
MAX1551EZK+	N/A	N/a	2500	avai	SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
MAX1551EZK+T	N/A	N/a	2500	avai	SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
MAX1555EZK+	N/A	N/a	2500	avai	SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
MAX1555EZK+T	MAXIM	N/a	6000	avai	SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers