MAX1874 Maxim, MAX1874 Datasheet
MAX1874
Manufacturer Part Number
MAX1874
Description
Dual-Input / USB/AC Adapter / 1-Cell Li+ Charger with OVP and Thermal Regulation
Manufacturer
Maxim
Datasheet
1.MAX1874.pdf
(16 pages)
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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 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 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
-40°C to +85°C temperature range.
19-2912; Rev 0; 7/03
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.
Li+ Charger with OVP and Thermal Regulation
✕
PDAs
Wireless Appliances
5mm thin QFN package and operates over the
TOP VIEW
DCLV
USEL
CHG
DC
________________________________________________________________ Maxim Integrated Products
1
2
3
4
16
5
5mm x 5mm
General Description
THIN QFN
MAX1874
15
6
Pin Configuration
14
7
Cell Phones
Digital Cameras
13
8
Dual-Input, USB/AC Adapter, 1-Cell
Applications
12
11
10
9
USB
BYP
PGND
REF
o Charge from USB* or AC Adapter
o Automatic Switchover to AC Adapter
o Thermal Limiting Simplifies Board Design
o Small, High-Power 16-Pin Thin QFN Package
o Input Protection Up to 18V
o Soft-Start
o Automatic Battery-to-Input Load Switch
*Protected by U.S. Patent #6,507,172.
Functional Diagram appears at the end of the data sheet.
MAX1874ETE
USB INPUT
DC INPUT
TO REF
PART
-40°C to +85°C 16 Thin QFN 5mm x 5mm
TEMP RANGE PIN-PACKAGE
Typical Operating Circuit
Ordering Information
DC
DCOK
DCLV
UOK
USB
DCI
BYP
REGULATOR
MAX1874
PGND
THRM
USEL
BATT
CHG
GND
PON
REF
EN
Features
NTC
THERMISTOR
500mA
100mA
Li+
CELL
1
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