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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1645 Datasheet

Level 2 Battery Chargers

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19-1566; Rev 2; 1/01
Advanced Chemistry-Independent, Level 2
Battery Chargers with Input Current Limiting
General Description
The MAX1645 are high-efficiency battery chargers capa-
ble of charging batteries of any chemistry type. It uses the
Intel System Management Bus (SMBus) to control volt-
age and current charge outputs.
When charging lithium-ion (Li+) batteries, the MAX1645
automatically transition from regulating current to regu-
lating voltage. The MAX1645 can also limit line input
current so as not to exceed a predetermined current
drawn from the DC source. A 175s charge safety timer
prevents “runaway charging” should the MAX1645 stop
receiving charging voltage/ current commands.
The MAX1645 employs a next-generation synchronous
buck control circuity that lowers the minimum input-to-
output voltage drop by allowing the duty cycle to
exceed 99%. The MAX1645 can easily charge one to
four series Li+ cells.
Applications
Notebook Computers
Point-of-Sale Terminals
Personal Digital Assistants
Features
o Input Current Limiting
o 175s Charge Safety Timeout
o 128mA Wake-Up Charge
o Charges Any Chemistry Battery: Li+, NiCd,
NiMH, Lead Acid, etc.
o Intel SMBus 2-Wire Serial Interface
o Compliant with Level 2 Smart Battery Charger
Spec Rev. 1.0
o +8V to +28V Input Voltage Range
o Up to 18.4V Battery Voltage
o 11-Bit Battery Voltage Setting
o ±0.8% Output Voltage Accuracy with Internal
Reference
o 3A max Battery Charge Current
o 6-Bit Charge Current Setting
o 99.99% max Duty Cycle for Low-Dropout Operation
o Load/Source Switchover Drivers
o >97% Efficiency
TOP VIEW
Pin Configuration
DCIN 1
LDO 2
CLS 3
REF 4
CCS 5
CCI 6
CCV 7
GND 8
BATT 9
DAC 10
VDD 11
THM 12
SCL 13
SDA 14
MAX1645
MAX1645A
QSOP
28 CVS
27 PDS
26 CSSP
25 CSSN
24 BST
23 DHI
22 LX
21 DLOV
20 DLO
19 PGND
18 CSIP
17 CSIN
16 PDL
15 INT
PART
MAX1645EEI
MAX1645AEEI
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
Typical Operating Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
________________________________________________________________ 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

MAX1645 Datasheet

Level 2 Battery Chargers

No Preview Available !

Advanced Chemistry-Independent, Level 2
Battery Chargers with Input Current Limiting
ABSOLUTE MAXIMUM RATINGS
DCIN, CVS, CSSP, CSSN, LX to GND....................-0.3V to +30V
CSSP to CSSN, CSIP to CSIN ...............................-0.3V to +0.3V
PDS, PDL to GND ...................................-0.3V to (VCSSP + 0.3V)
BST to LX..................................................................-0.3V to +6V
DHI to LX ...................................................-0.3V to (VBST + 0.3V)
CSIP, CSIN, BATT to GND .....................................-0.3V to +22V
LDO to GND .....................-0.3V to (lower of 6V or VDCIN + 0.3V)
DLO to GND ...........................................-0.3V to (VDLOV + 0.3V)
REF, DAC, CCV, CCI, CCS, CLS to GND.....-0.3V to (VLDO + 0.3V)
VDD, SCL, SDA, INT, DLOV to GND.........................-0.3V to +6V
THM to GND ...............................................-0.3V to (VDD + 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
LDO Continuous Current.....................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature.........................................-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
(Circuit of Figure 1, VDD = +3.3V, VBATT = +16.8V, VDCIN = +18V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
GENERAL SPECIFICATIONS
DCIN Typical Operating Range
DCIN Supply Current
DCIN Supply Current Charging
Inhibited
DCIN Undervoltage Threshold
LDO Output Voltage
VDD Input Voltage Range
(Note 1)
VDD Undervoltage Threshold
VDD Quiescent Current
REF Output Voltage
BATT Undervoltage Threshold
(Note 2)
SYMBOL
CONDITIONS
VDCIN
IDCIN
VLDO
IDD
VREF
8V < VDCIN < 28V
8V < VDCIN < 28V
When AC_PRESENT
switches
DCIN rising
DCIN falling
8V < VDCIN < 28V, 0 < ILDO < 15mA
8V < VDCIN < 28V
When the SMB res- VDD rising
ponds to commands VDD falling
0 < VDCIN < 6V, VDD = 5V, VSCL = 5V,
VSDA = 5V
0 < IREF < 200µA
When ICHARGE drops to 128mA
MIN TYP MAX UNITS
8 28
1.7 6
0.7 2
7.5 7.85
7 7.4
5.15 5.4 5.65
2.8 5.65
2.55 2.8
2.1 2.5
80 150
4.066 4.096 4.126
2.4 2.8
V
mA
mA
V
V
V
V
µA
V
V
PDS Charging Source Switch
Turn-Off Threshold
VPDS-OFF VCVS referred to VBATT, VCVS falling
50 100 150 mV
PDS Charging Source Switch
Threshold Hysteresis
VPDS-HYS VCVS referred to VBATT
100 200 300 mV
PDS Output Low Voltage, PDS
Below CSSP
PDS Turn-On Current
PDS Turn-Off Current
PDL Load Switch Turn-Off
Threshold
IPDS = 0
PDS = CSSP
VPDS = VCSSP - 2V, VDCIN = 16V
VPDL-OFF VCVS referred to VBATT, VCVS rising
8 10 12 V
100 150 300 µA
10 50
mA
-150 -100 -50 mV
2 _______________________________________________________________________________________


Part Number MAX1645
Description Level 2 Battery Chargers
Maker Maxim
Total Page 30 Pages
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