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MAX8725

Description
Multichemistry Battery Charger with Automatic System Power Selector
File Size357KB,30 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX8725 Overview

Multichemistry Battery Charger with Automatic System Power Selector

19-2805; Rev 2; 9/04
VAILABLE
TION KIT A
EVALUA
Multichemistry Battery Chargers with Automatic
System Power Selector
General Description
The MAX1909/MAX8725 highly integrated control ICs
simplify construction of accurate and efficient multi-
chemistry battery chargers. The MAX1909/MAX8725
use analog inputs to control charge current and volt-
age, and can be programmed by a host microcontroller
(µC) or hardwired. High efficiency is achieved through
use of buck topology with synchronous rectification.
The maximum current drawn from the AC adapter is pro-
grammable to avoid overloading the AC adapter when
supplying the load and the battery charger simultane-
ously. The MAX1909/MAX8725 provide a digital output
that indicates the presence of an AC adapter, and an
analog output that monitors the current drawn from the
AC adapter. Based on the presence or absence of the
AC adapter, the MAX1909/MAX8725 automatically select
the appropriate source for supplying power to the sys-
tem by controlling two external p-channel MOSFETs.
Under system control, the MAX1909/MAX8725 allow the
battery to undergo a relearning or conditioning cycle in
which the battery is completely discharged through the
system load and then recharged.
The MAX1909 includes a conditioning charge feature
while the MAX8725 does not. The MAX1909/MAX8725
are available in space-saving 28-pin, 5mm
5mm thin
QFN packages and operate over the extended -40°C to
+85°C temperature range. The MAX1909/MAX8725 are
now available in lead-free packages.
Features
±0.5% Accurate Charge Voltage (0°C to +85°C)
±3% Accurate Input Current Limiting
±5% Accurate Charge Current
Programmable Charge Current >4A
Automatic System Power-Source Selection
Analog Inputs Control Charge Current and
Charge Voltage
Monitor Outputs for
Current Drawn from AC Input Source
AC Adapter Presence
Up to 17.65V (max) Battery Voltage
Maximum 28V Input Voltage
Greater than 95% Efficiency
Charge Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
MAX1909/MAX8725
Ordering Information
PART
MAX1909ETI
MAX1909ETI+
MAX8725ETI
MAX8725ETI+
+
Denotes
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN
28 Thin QFN
28 Thin QFN
28 Thin QFN
lead-free package.
Minimum Operating Circuit
P3
AC ADAPTER: INPUT
0.01Ω
SRC
CSSP
PDS
SRC
DCIN
VCTL
CSSN
DHIV
PDL
P2
TO
EXTERNAL LOAD
Applications
Notebook and Subnotebook Computers
Hand-Held Data Terminals
Pin Configuration
CSSN
CSSP
DHIV
PDS
SRC
PDL
TOP VIEW
MAX1909
LDO
MAX8725
LDO
ICTL
MODE
ACIN
DLOV
P1
DHI
28
DCIN
LDO
ACIN
REF
GND/PKPRES
ACOK
MODE
27
26
25
24
23
DHI
22
LDO
1
2
3
4
5
6
7
8
IINP
21
20
19
DLOV
DLO
IINP
REF
IINP
CLS
ACOK
PGND
CSIP
CSIN
MAX8725 ONLY
LDO
DLO
PGND
PKPRES
CSIP
0.015Ω
CCV
CCI
CCS
REF
CSIN
BATT
GND
N1
10µH
MAX1909
MAX8725
18
17
16
15
BATT
GND
9
CLS
10
ICTL
11
VCTL
12
CCI
13
CCV
14
CCS
THIN QFN
Functional Diagrams appear at end of 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.
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