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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1772 Datasheet

Low-Cost / Multichemistry Battery- Charger Building Block

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MAX1772 pdf
19-1772; Rev 2; 5/02
Low-Cost, Multichemistry Battery-
Charger Building Block
General Description
The MAX1772 is a highly-integrated, multichemistry
battery-charger control IC that simplifies the construc-
tion of accurate and efficient chargers. The MAX1772
uses analog inputs to control charge current and volt-
age and can be programmed by the host or hardwired.
High efficiency is achieved by a buck topology with
synchronous rectification.
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. This enables the user to reduce the cost of the
AC adapter. The MAX1772 provides outputs that can
be used to monitor the current drawn from the AC
adapter, battery-charging current, and the presence of
an AC adapter.
The MAX1772 can charge two to four lithium-ion (Li+)
series cells, easily providing 4A. When charging, the
MAX1772 automatically transitions from regulating cur-
rent to regulating voltage. It is available in a space-sav-
ing 28-pin QSOP package.
Applications
Notebook and Subnotebook Computers
Personal Digital Assistants
Hand-Held Terminals
Features
o Input Current Limiting
o ±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)
o Programmable Battery Charge Current >4A
o Analog Inputs Control Charge Current and
Charge Voltage
o Monitor Outputs for:
Current Drawn from AC Input Source
Charging Current
AC Adapter Present
o Up to 18.2V (max) Battery Voltage
o 8V to 28V Input Voltage
o >95% Efficiency
o 99.99% (max) Duty Cycle for Low-Dropout
Operation
o Charges Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
Pin Configuration
TOP VIEW
DCIN 1
LDO 2
CLS 3
REF 4
CCS 5
CCI 6
CCV 7
GND 8
GND 9
ICHG 10
ACIN 11
ACOK 12
REFIN 13
ICTL 14
MAX1772
28 IINP
27 CSSP
26 CSSN
25 BST
24 DHI
23 LX
22 DLOV
21 DLO
20 PGND
19 CSIP
18 CSIN
17 BATT
16 CELLS
15 VCTL
PART
MAX1772EEI
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
QSOP
________________________________________________________________ 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

MAX1772 Datasheet

Low-Cost / Multichemistry Battery- Charger Building Block

No Preview Available !

MAX1772 pdf
Low-Cost, Multichemistry Battery-
Charger Building Block
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN to GND ...................................-0.3V to +30V
BST to GND ............................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
DHI to LX ....................................................-0.3V to (BST + 0.3V)
LX to GND .................................................................-6V to +30V
BATT, CSIP, CSIN to GND........................................-0.3V to 20V
CSIP to CSIN or CSSP to CSSN or
PGND to GND ...........……….……………..…….-0.3V to +0.3V
CCI, CCS, CCV, DLO, ICHG, IINP,
ACIN, REF to GND ..............................-0.3V to (VLDO + 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS,
CLS, LDO, ACOK to GND ....................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND ..........................................-0.3V to (DLOV + 0.3V)
LDO Short-Circuit Current ..................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range
MAX1772EEI ....................................................-40°C to +85°C
Junction Temperature ........................................................150°C
Storage Temperature Range .............................-60°C to +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
(VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3.0V, VVCTL = VICTL = 0.75 REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, VBST - VLX = 4.5V, GND = PGND = 0, CLDO = 1µF, LDO = DLOV, CREF = 1µF; pins CCI, CCS, and CCV are
compensated per Figure 1a; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
VDCIN
DCIN Undervoltage Lockout
Trip Point
DCIN Quiescent Current
LDO Output Voltage
LDO Load Regulation
IDCIN
LDO Undervoltage Lockout
Trip Point
REF Output Voltage
CONDITIONS
DCIN falling
DCIN rising
8.0V < VDCIN < 28V
8.0V < VDCIN < 28V, no load
0 < ILDO < 10mA
VDCIN = 8.0V
0 < IREF < 500µA
MIN TYP MAX UNITS
8
7.0
5.25
7.4
7.5
2.7
5.40
34
28
7.85
6.0
5.55
100
3.20 4.00 5.15
4.072 4.096 4.120
V
V
mA
V
mV
V
V
REF Undervoltage Lockout
Trip Point
REF falling
3.1 3.9
V
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
VCSSP falling
50 100 150
100 200 300
mV
mV
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
CLS Input Range
CLS Input Bias Current
SWITCHING REGULATOR
Minimum Off-Time
Maximum On-Time
Oscillator Frequency
fOSC
ACIN rising
0.5% of REF
VACIN = 2.048V
VCLS = 2.0V
VBATT =16.8V
(Note 1)
2.007
10
-1
1.6
-1
2.048
20
2.089
30
+1
REF
+1
V
mV
µA
V
µA
1.00
5
1.25
10
1.50
15
400
µs
ms
kHz
2 _______________________________________________________________________________________


Part Number MAX1772
Description Low-Cost / Multichemistry Battery- Charger Building Block
Maker Maxim
Total Page 20 Pages
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