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MAX1772EEI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
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
Handheld 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.
MAX1772
Low-Cost, Multichemistry Battery-
Charger Building Block
________________________________________________________________
Maxim Integrated Products
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4
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14
IINP
CSSP
CSSN
BST
DHI
LX
VCTL
DLOV
DLO
PGND
CSIP
CSIN
BATT
CELLS
ICTL
REFIN
ACOK
ACIN
ICHG
GND
GND
CCV
CCI
CCS
REF
CLS
LDO
DCIN
QSOP
TOP VIEW
MAX1772
Pin Configuration
19-1772; Rev 4; 2/09
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1772EEI -40°C to +85°C 28 QSOP
MAX1772EEI+ -40°C to +85°C 28 QSOP
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes lead(Pb)-free/RoHS-compliant package.
MAX1772
Low-Cost, Multichemistry Battery-
Charger Building Block
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3.0V, V
VCTL
= V
ICTL
= 0.75
V
REFIN
, V
CELLS
= 2.0V,
V
ACIN
= 0V, CLS = REF, V
BST
- V
LX
= 4.5V, V
GND
= V
PGND
= 0V, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; pins CCI, CCS, and CCV
are compensated per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
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 (V
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 (V
LDO
+ 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 (V
DLOV
+ 0.3V)
LDO Short-Circuit Current ..................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 12.6mW/°C above +70°C).......1008mW
Junction-to-Ambient Thermal Resistance (θ
JA
)
(Note 1) .....................................................................79.3°C/W
Junction-to-Case Thermal Resistance ( θ
JC
)
(Note 1) ........................................................................27°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ........................................................150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
V
DCIN
8 28 V
V
DCIN
falling
7.0 7.4
DCIN Undervoltage Lockout
Trip Point
V
DCIN
rising
7.5
7.85
V
DCIN Quiescent Current
I
DCIN
8.0V < V
DCIN
< 28V
2.7 6.0 mA
LDO Output Voltage
8.0V < V
DCIN
< 28V, no load
5.25 5.40 5.55
V
LDO Load Regulation
0 < I
LDO
< 10mA
34
100
mV
LDO Undervoltage Lockout
Trip Point
V
DCIN
= 8.0V
3.20 4.00 5.15
V
REF Output Voltage
0 < I
REF
< 500µA
4.072 4.096 4.120
V
REF Undervoltage Lockout
Trip Point
V
REF
falling
3.1 3.9 V
TRIP POINTS
V
CSSP
falling
50 100
150
mV
BATT POWER_FAIL Threshold
Hysteresis
100
200
300
mV
ACIN Threshold
V
ACIN
rising
2.007 2.048 2.089
V
ACIN Threshold Hysteresis
0.5% of V
REF
10 20 30 mV
ACIN Input Bias Current
V
ACIN
= 2.048V
-1 +1 µA
CLS Input Range 1.6
REF
V
CLS Input Bias Current
V
CLS
= 2.0V
-1 +1 µA
SWITCHING REGULATOR
Minimum Off-Time
V
BATT
=16.8V
1.00 1.25 1.50
µs
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
MAX1772
Low-Cost, Multichemistry Battery-
Charger Building Block
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3.0V, V
VCTL
= V
ICTL
= 0.75
V
REFIN
, V
CELLS
= 2.0V,
V
ACIN
= 0V, CLS = REF, V
BST
- V
LX
= 4.5V, V
GND
= V
PGND
= 0V, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; pins CCI, CCS, and CCV
are compensated per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Maximum On-Time 5 10 15 ms
Oscillator Frequency
f
OSC
(Note 2)
400
kHz
DLOV Supply Current
I
DLOV
DLO low 5 10 µA
BST Supply Current
I
BST
DHI high 6 15 µA
LX Input Bias Current
V
DCIN
= 28V, V
BATT
= V
LX
= 20V
150
500
µA
LX Input Quiescent Current
V
DCIN
= 0V, V
BATT
= V
LX
= 20V
0.3 1.0 µA
DHI Maximum Duty Cycle
99.0 99.9
%
DHI On-Resistance High
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
4 7 Ω
DHI On-Resistance Low
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
1 2 Ω
DLO On-Resistance High
V
DLOV
= 4.5V, I
DLO
= +100mA
4 7 Ω
DLO On-Resistance Low
V
DLOV
= 4.5V, I
DLO
= -100mA
1 2 Ω
V
BATT
= 19V, V
DCIN
= 0V
5
BATT Input Current
I
BATT
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
200
500
µA
V
DCIN
= 0V
1 5
CSIP/CSIN Input Current
V
CSIP
= V
CSIN
= 12V
800
µA
V
DCIN
= 0V
0.1 0.3
CSSP/CSSN Input Current
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
800
µA
BATT/CSIP/CSIN Input Voltage
Range
0 19 V
CSIP to CSIN Full-Scale
Current-Sense Voltage
V
BATT
= 12V
189
204
219
mV
CSSP to CSSN Full-Scale
Current-Sense Voltage
189
204
219
mV
ERROR AMPLIFIERS
GMV Amplifier
Transconductance
V C TL = RE FIN , V
BAT T
= 16.8V , C E LLS = LD O
0.0625 0.1250 0.250
µS
GMI Amplifier
Transconductance
ICTL = REFIN, V
CSIP
- V
CSIN
= 150.4mV
0.5 1 2 µS
GMS Amplifier
Transconductance
V
CLS
= 2.048V, V
CSSP
- V
CSSN
= 102.4mV
0.5 1 2 µS
CCI/CCS/CCV Clamp Voltage
0.25V < V
CCI
, V
CCS
, V
CCV
< 2.0V
150
300
600
mV
CURRENT AND VOLTAGE SETTING
ICTL = REFIN (see Equation 2) -8 +8
Charging-Current Accuracy
ICTL = REFIN/32 (see Equation 2) -55
+55
%
V
VCTL
= V
ICTL
= V
REFIN
= 3V
-1 +1
ICTL, VCTL, REFIN Input Bias
Current
V
DCIN
= 0, V
VCTL
= V
ICTL
= V
REFIN
= 5V
-1 +1
µA
ICTL Power-Down Mode
Threshold Voltage
REFIN
/100
REFIN
/55
REFIN
/33
V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX1772EEI+

Mfr. #:
Buy MAX1772EEI+
Manufacturer:
Maxim Integrated
Description:
Battery Management Battery-Charger Building Block
Lifecycle:
New from this manufacturer.
Delivery:
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