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MAX1925 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX1925
Description  Switch-Mode 1-Cell Li Chargers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1925 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX1925/MAX1926 single-cell lithium-ion (Li+)
switch-mode battery chargers use an external PMOS
pass element step-down configuration. Charge current
is programmable, and an external capacitor sets the
maximum charge time.
Additional features include automatic input power
detection (ACON output), logic-controlled enable, and
temperature monitoring with an external thermistor. The
MAX1925 disables charging for inputs greater than
6.1V, while the MAX1926 charges for inputs between
4.25V and 12V.
The MAX1925/MAX1926 feature two precondition levels
to restore near-dead cells. The devices source 4mA to
a cell that is below 2V while sourcing C/10 to a cell
between 2V and 3V. Full charge current is then applied
above 3V. A CHG output drives an LED to indicate
charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are available in a 12-pin
4mm 4mm thin QFN package and are specified over
the extended temperature range (-40°C to +85°C). An
evaluation kit is available to speed design.
Applications
Digital Cameras
Self-Charging Battery Packs
PDAs
Cradle Chargers
Features
o Small (4mm 4mm) Package
o 4.25V to 12V Input Range (MAX1926)
o Overvoltage Lockout at 6.1V (MAX1925)
o ±0.75% Battery Regulation Voltage
o Set Charge Current with One Resistor
o Automatic Input Power Sense
o LED (or Logic-Out) Charge Status and Fault
Indicator
o Programmable Safety Timer
o Autorestart at Cell = 4V
o Thermistor Monitor Input
Switch-Mode 1-Cell Li+ Chargers
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
MAX1925
MAX1926
IN
EN
INP
EXT
PGND
INPUT
4.5V TO 12V
LED
CT
CHG
ON
OFF
ACON
THRM
GND
BATT
CS
1-CELL
Li+
BATTERY
Typical Operating Circuit
19-2556; Rev 1; 10/02
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.
EVALUATION
KIT
AVAILABLE
PART
TEMP
RANGE
PIN-
PACKAGE
INPUT
CHARGING
RANGE
MAX1925ETC
-40
°C to +85°C
12 Thin QFN
4mm x 4mm
4.5V to 6.1V
MAX1926ETC
-40
°C to +85°C
12 Thin QFN
4mm x 4mm
4.25V to 12V
12
IN
11
INP
10
EXT
45
CT
6
CS
1
2
EN
3
9
8
7
THRM
PGND
GND
BATT
MAX1925
MAX1926
CHG
ACON
THIN QFN
Pin Configuration


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