19-1772; Rev 4; 2/09
Low-Cost, Multichemistry Battery-
Charger Building Block
General Description
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
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
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
28 IINP
27 CSSP
26 CSSN
25 BST
Ordering Information
PART
MAX1772EEI
MAX1772EEI+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
+Denotes
lead(Pb)-free/RoHS-compliant package.
MAX1772
24 DHI
23 LX
22 DLOV
21 DLO
20 PGND
19 CSIP
18 CSIN
17 BATT
16 CELLS
15 VCTL
QSOP
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Cost, Multichemistry Battery-
Charger Building Block
MAX1772
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 (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
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
.
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
(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
8
V
DCIN
falling
V
DCIN
rising
I
DCIN
8.0V < V
DCIN
< 28V
8.0V < V
DCIN
< 28V, no load
0 < I
LDO
< 10mA
V
DCIN
= 8.0V
0 < I
REF
< 500µA
V
REF
falling
3.20
4.072
5.25
7.0
7.4
7.5
2.7
5.40
34
4.00
4.096
3.1
7.85
6.0
5.55
100
5.15
4.120
3.9
TYP
MAX
28
UNITS
V
V
mA
V
mV
V
V
V
SUPPLY AND LDO REGULATOR
V
DCIN
DCIN Input Voltage Range
DCIN Undervoltage Lockout
Trip Point
DCIN Quiescent Current
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage Lockout
Trip Point
REF Output Voltage
REF Undervoltage Lockout
Trip Point
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
CLS Input Range
CLS Input Bias Current
SWITCHING REGULATOR
Minimum Off-Time
V
BATT
=16.8V
V
CLS
= 2.0V
V
ACIN
rising
0.5% of V
REF
V
ACIN
= 2.048V
V
CSSP
falling
50
100
2.007
10
-1
1.6
-1
1.00
100
200
2.048
20
150
300
2.089
30
+1
REF
+1
mV
mV
V
mV
µA
V
µA
µs
1.25
1.50
2
_______________________________________________________________________________________
Low-Cost, Multichemistry Battery-
Charger Building Block
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
Maximum On-Time
Oscillator Frequency
DLOV Supply Current
BST Supply Current
LX Input Bias Current
LX Input Quiescent Current
DHI Maximum Duty Cycle
DHI On-Resistance High
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
BATT Input Current
CSIP/CSIN Input Current
CSSP/CSSN Input Current
BATT/CSIP/CSIN Input Voltage
Range
CSIP to CSIN Full-Scale
Current-Sense Voltage
CSSP to CSSN Full-Scale
Current-Sense Voltage
ERROR AMPLIFIERS
GMV Amplifier
Transconductance
GMI Amplifier
Transconductance
GMS Amplifier
Transconductance
CCI/CCS/CCV Clamp Voltage
CURRENT AND VOLTAGE SETTING
Charging-Current Accuracy
ICTL, VCTL, REFIN Input Bias
Current
ICTL Power-Down Mode
Threshold Voltage
ICTL = REFIN (see Equation 2)
ICTL = REFIN/32 (see Equation 2)
V
VCTL
= V
ICTL
= V
REFIN
= 3V
V
DCIN
= 0, V
VCTL
= V
ICTL
= V
REFIN
= 5V
-8
-55
-1
-1
REFIN
/100
REFIN
/55
+8
+55
+1
+1
REFIN
/33
%
µA
V
VCTL = REFIN, V
BATT
= 16.8V, CELLS = LDO
ICTL = REFIN, V
CSIP
- V
CSIN
= 150.4mV
V
CLS
= 2.048V, V
CSSP
- V
CSSN
= 102.4mV
0.25V < V
CCI
, V
CCS
, V
CCV
< 2.0V
0.0625
0.5
0.5
150
0.1250
1
1
300
0.250
2
2
600
µS
µS
µS
mV
V
BATT
= 12V
I
BATT
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
V
DLOV
= 4.5V, I
DLO
= +100mA
V
DLOV
= 4.5V, I
DLO
= -100mA
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
V
DCIN
= 0V
V
CSIP
= V
CSIN
= 12V
V
DCIN
= 0V
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
0
189
189
204
204
0.1
200
1
f
OSC
I
DLOV
I
BST
(Note 2)
DLO low
DHI high
V
DCIN
= 28V, V
BATT
= V
LX
= 20V
V
DCIN
= 0V, V
BATT
= V
LX
= 20V
99.0
5
6
150
0.3
99.9
4
1
4
1
7
2
7
2
5
500
5
800
0.3
800
19
219
219
SYMBOL
CONDITIONS
MIN
5
TYP
10
MAX
15
400
10
15
500
1.0
UNITS
ms
kHz
µA
µA
µA
µA
%
Ω
Ω
Ω
Ω
µA
µA
µA
V
mV
mV
MAX1772
_______________________________________________________________________________________
3
Low-Cost, Multichemistry Battery-
Charger Building Block
MAX1772
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
V
VCTL
= V
REFIN
(2, 3, or 4 cells)
(see Equation 1)
V
VCTL
= V
REFIN
/20 (2, 3, or 4 cells)
(see Equation 1)
MIN
-0.5
-0.5
2.0
1.20
V
ICHG
to (V
CSIP
- V
CSIN
); V
CSIP
-
V
CSIN
= 0.185V; V
ICHG
= 0V, 3.0V
V
CSIP
- V
CSIN
= 0.185V
V
CSIP
- V
CSIN
= 0.05V
V
IINP
to (V
CSSP
- V
CSSN
); V
CSSP
-
V
CSSN
= 0.185V; V
IINP
= 0V, 3.0V (Note 3)
V
CSSP
- V
CSSN
= 0.185V
V
CSSP
- V
CSSN
= 0.05V
(Note 3)
0.95
-5
-10
0.85
-15
-20
-10
-10
8.0
1.00
1.00
TYP
MAX
+0.5
%
+0.5
3.6
1.92
1.05
+5
+10
1.15
+15
+20
+10
+10
28
V
V
µS
%
µS
%
%
V
UNITS
Battery-Regulation Voltage
Accuracy
REFIN Range
REFIN Undervoltage Lockout
ICHG Transconductance
ICHG Accuracy
IINP Transconductance
IINP Current Accuracy
CSSP - CSSN Accuracy
CSSP + CSSN Input Voltage
Range
LOGIC LEVELS
CELLS Input Low Voltage
CELLS Input Middle Voltage
CELLS Input High Voltage
CELLS Input Bias Current
ACOK Sink Current
ACOK Leakage Current
V
CELLS
= 0V or V
LDO
V
ACOK
= 0.4V
V
ACOK
= 5.5V
V
CSSP
- V
CSSN
= 0.08V, V
CLS
= 1.6V
V
CSSP
- V
CSSN
= 0.2V, CLS = REF
0.2
0.4
V
LDO
- 0.25
-10
1
-1
+1
V
LDO
- 0.5
V
LDO
+10
V
V
V
µA
mA
µA
4
_______________________________________________________________________________________
Low-Cost, Multichemistry Battery-
Charger Building Block
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
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
DCIN Undervoltage Lockout
Trip Point
DCIN Quiescent Current
LDO Output Voltage
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
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
DHI Maximum Duty Cycle
BATT Input Current
CSIP/CSIN Input Current
CSSP/CSSN Input Current
BATT/CSIP/CSIN Input Voltage
Range
CSIP to CSIN Full-Scale
Current-Sense Voltage
CSSP to CSSN Full-Scale
Current-Sense Voltage
CURRENT AND VOLTAGE SETTING
Charging Current Accuracy
ICTL, VCTL, REFIN Input Bias
Current
ICTL = REFIN (see Equation 2)
ICTL = REFIN/32 (see Equation 2)
V
VCTL
= V
ICTL
= V
REFIN
= 3V
V
DCIN
= 0V, V
VCTL
= V
ICTL
= V
REFIN
= 5V
-8
-55
-1
-1
+8
+55
+1
+1
%
µA
V
BATT
= 12V
I
BATT
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
V
DCIN
= 0V
V
CSIP
= V
CSIN
= 12V
V
DCIN
= 0V
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
0
189
189
f
OSC
(Note 1)
99
5
500
5
800
0.3
800
19
219
219
V
BATT
= 16.8V
1
5
1.5
15
400
µs
ms
kHz
%
µA
µA
µA
V
mV
mV
V
CLS
= 2.0V
V
ACIN
rising
0.5% of REF
V
ACIN
= 2.048V
V
CSSP
falling
50
100
2.007
10
-1
1.6
-1
150
300
2.089
30
+1
REF
+1
mV
mV
V
mV
µA
V
µA
I
DCIN
V
DCIN
V
DCIN
falling
V
DCIN
rising
8.0V < V
DCIN
< 28V
8.0V < V
DCIN
< 28V, no load
5.25
8.0
7
7.85
6
5.65
28.0
V
V
mA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1772
_______________________________________________________________________________________
5
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