datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1874 Datasheet

1-Cell Li+ Charger

No Preview Available !

MAX1874 pdf
19-2912; Rev 1; 2/07
EVAALVUAAILTAIOBNLEKIT
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 CHG output 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
PDAs
Cell Phones
Wireless Appliances Digital Cameras
Pin Configuration
TOP VIEW
16 15 14 13
DCLV
DC
CHG
USEL
1
2
3
4
MAX1874
12 USB
11 BYP
10 PGND
9 REF
5678
Features
Charge from USB or AC Adapter
Automatic Switchover to AC Adapter
Thermal Limiting Simplifies Board Design
Small, High-Power 16-Pin Thin QFN Package
Input Protection Up to 18V
Soft-Start
Automatic Battery-to-Input Load Switch
PART
MAX1874ETE
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
16 Thin QFN
5mm x 5mm
PKG
CODE
T1655-2
Typical Operating Circuit
DC INPUT
USB INPUT
TO REF
DC
MAX1874 PON
DCOK
DCLV
BATT
UOK
USB
CHG
USEL
DCI EN
REGULATOR REF
Li+
CELL
500mA
100mA
THRM
NTC
THERMISTOR
BYP PGND GND
THIN QFN
5mm x 5mm
Functional Diagram appears at the end of the data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1874 Datasheet

1-Cell Li+ Charger

No Preview Available !

MAX1874 pdf
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
ABSOLUTE MAXIMUM RATINGS
DC, DCOK to 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
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
(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.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
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 5
18 V
Maximum DC Input Voltage Without
Overvoltage Protection
Maximum Input Voltage for Charging
DC Supply Current
DCLV Operating Voltage Range
DCLV Shutdown Supply Current
USB Input Voltage Range
USB Supply Current
DCI Input Current
BYP Output Resistance
THRM Input Bias Current
BATTERY VOLTAGE
BATT Regulation Voltage
BATT Prequal Voltage Threshold
Prequal Threshold Hysteresis
USB Charging Headroom
DC Charging Headroom
REF Voltage (Buffered Output)
DC = DCLV, Q2 input MOSFET not on circuit,
Figure 2
VEN = 0V
VEN = 5V
VEN = 0V
VEN = 0V
VEN = 5V, VDC = 0V
VEN = 5V, VDC = 5V
(Note 1)
BATT rising
IUSB = 100mA
IUSB = 500mA
IDCIN = 800mA
IREF = 0 to 500µA, 4V < VDC or VUSB < 6.5V;
does not affect BATT regulation accuracy
6.5
6.0 6.2 6.5
24
46
4.35 6.00
300 500
4.35 6.50
500 750
23
160 300
1 100
5
1 100
V
V
mA
V
µA
V
µA
mA
µA
nA
nA
4.1685
2.8
4.20
3
70
100
200
250
4.2315
3.2
2.94 3 3.06
V
V
mV
mV
mV
V
2 _______________________________________________________________________________________


Part Number MAX1874
Description 1-Cell Li+ Charger
Maker Maxim
Total Page 17 Pages
PDF Download
MAX1874 pdf
MAX1874 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX187 +5V / Low-Power / 12-Bit Serial ADCs Maxim
Maxim
MAX187 pdf
2 MAX1870A Step-Up / Step-Down Li+ Battery Charger Maxim
Maxim
MAX1870A pdf
3 MAX1873 Simple Current-Limited Switch-Mode Li Charger Controller Maxim
Maxim
MAX1873 pdf
4 MAX1874 1-Cell Li+ Charger Maxim
Maxim
MAX1874 pdf
5 MAX1875 Dual 180 Out-of-Phase PWM Step- Down Controllers with POR Maxim
Maxim
MAX1875 pdf
6 MAX1876 Dual 180 Out-of-Phase PWM Step- Down Controllers with POR Maxim
Maxim
MAX1876 pdf
7 MAX1879 Simple / Efficient / 1-Cell Li+ Pulse Charger Maxim
Maxim
MAX1879 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy