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MAX1772
Technical data
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MAXIM MAX1772 Technical data

General Description
The MAX1772 is a highly-integrated, multichemistry battery-charger control IC that simplifies the construc­tion of accurate and efficient chargers. The MAX1772 uses analog inputs to control charge current and volt­age 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 pro­grammable to avoid overloading the AC adapter when supplying the load and the battery charger simultane­ously. 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 cur­rent to regulating voltage. It is available in a space-sav­ing 28-pin QSOP package.
Applications
Notebook and Subnotebook Computers Personal Digital Assistants Handheld Terminals
Features
♦ Input Current Limiting
♦ ±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)
♦ Programmable Battery Charge Current >4A
♦ Analog Inputs Control Charge Current and
Charge Voltage
♦ Monitor Outputs for:
Current Drawn from AC Input Source Charging Current AC Adapter Present
♦ Up to 18.2V (max) Battery Voltage
♦ 8V to 28V Input Voltage
♦ >95% Efficiency
♦ 99.99% (max) Duty Cycle for Low-Dropout
Operation
♦ Charges Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
MAX1772
Low-Cost, Multichemistry Battery-
Charger Building Block
________________________________________________________________ Maxim Integrated Products 1
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1
2
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12
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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 3; 8/05
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/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+Denotes lead-free package.
MAX1772
Low-Cost, Multichemistry Battery­Charger 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 ✕REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- VLX= 4.5V, GND = PGND = 0, 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 TA= +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 (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 (T
A
= +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
PARAMETER
CONDITIONS
UNITS
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
V
DCIN
8 28 V DCIN falling 7.0 7.4
DCIN Undervoltage Lockout
Trip Point
DCIN rising 7.5
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
V
LDO Load Regulation
0 < I
LDO
< 10mA
34
mV
LDO Undervoltage Lockout
Trip Point
V
DCIN
= 8.0V
V
REF Output Voltage
0 < I
REF
< 500µA
V
REF Undervoltage Lockout
Trip Point
REF falling 3.1 3.9 V
TRIP POINTS
BATT POWER_FAIL Threshold
V
CSSP
falling
50 100
mV
BATT POWER_FAIL Threshold
Hysteresis
200
mV
ACIN Threshold ACIN rising
V ACIN Threshold Hysteresis 0.5% of REF 10 20 30 mV ACIN Input Bias Current
V
ACIN
= 2.048V
-1 +1 µA
CLS Input Range 1.6
V CLS Input Bias Current
V
CLS
= 2.0V
-1 +1 µA
SWITCHING REGULATOR
Minimum Off-Time
V
BATT
=16.8V
µs Maximum On-Time 5 10 15 ms Oscillator Frequency
f
OSC
(Note 1)
kHz
SYMBOL
MIN TYP MAX
5.25 5.40 5.55
3.20 4.00 5.15
4.072 4.096 4.120
100
2.007 2.048 2.089
1.00 1.25 1.50
7.85
100
150
300
REF
400
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 ✕REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- VLX= 4.5V, GND = PGND = 0, 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 TA= +25°C.)
PARAMETER
CONDITIONS
UNITS
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
= VLX = 20V
150
µA LX Input Quiescent Current
V
DCIN
= 0, V
BATT
= VLX = 20V
0.3 1.0 µA
DHI Maximum Duty Cycle
%
DHI On-Resistance High
V
BST
- VLX = 4.5V, I
DHI
= +100mA
4 7 Ω
DHI On-Resistance Low
V
BST
- VLX = 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
= 0
5
BATT Input Current
I
BATT
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
200
µA
V
DCIN
= 0
1 5
CSIP/CSIN Input Current
V
CSIP
= V
CSIN
= 12V
µA
V
DCIN
= 0
0.1 0.3
CSSP/CSSN Input Current
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
µA
BATT/CSIP/CSIN Input Voltage
Range
0 19 V
CSIP to CSIN Full-Scale
Current-Sense Voltage
V
BATT
= 12V
204
mV
CSSP to CSSN Full-Scale
Current-Sense Voltage
204
mV
ERROR AMPLIFIERS
GMV Amplifier
Transconductance
V C TL = RE FIN , V
BAT T
= 16.8V , C E LLS = LD O
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
CCV/S/I
< 2.0V
300
mV
CURRENT AND VOLTAGE SETTING
ICTL = REFIN (see Equation 2) -8 +8
Charging-Current Accuracy
ICTL = REFIN/32 (see Equation 2) -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
REFIN
/55
REFIN
/33
V
SYMBOL
MIN TYP MAX
500
99.0 99.9
500
800
800
189
189
0.0625 0.1250 0.250
219
219
150
/100
600
+55
MAX1772
Low-Cost, Multichemistry Battery­Charger Building Block
4 _______________________________________________________________________________________
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 ✕REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- VLX= 4.5V, GND = PGND = 0, 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 TA= +25°C.)
PARAMETER
CONDITIONS
UNITS
V
VCTL
= V
REFIN
(2, 3, or 4 cells)
(see Equation 1)
Battery-Regulation Voltage
Accuracy
V
VCTL
= V
REFIN
/20 (2, 3, or 4 cells)
(see Equation 1)
%
REFIN Range 2.0 3.6 V REFIN Undervoltage Lockout
V
ICHG Transconductance
V
ICHG
to (V
CSIP
- V
CSIN
); V
CSIP
-
V
CSIN
= 0.185V; V
ICHG
= 0, 3.0V
µS
V
CSIP
- V
CSIN
= 0.185V
-5 +5
ICHG Accuracy
V
CSIP
- V
CSIN
= 0.05V
-10
%
IINP Transconductance
V
IINP
to (V
CSSP
- V
CSSN
); V
CSSP
-
V
CSSN
= 0.185V; V
IINP
= 0, 3.0V (Note 2)
µS
V
CSSP
- V
CSSN
= 0.185V
-15
IINP Current Accuracy
V
CSSP
- V
CSSN
= 0.05V
(Note 2)
-20
%
V
CSSP
- V
CSSN
= 0.08V, V
CLS
= 1.6V
-10
CSSP - CSSN Accuracy
V
CSSP
- V
CSSN
= 0.2V, CLS = REF
-10
%
CSSP + CSSN Input Voltage
Range
8.0 28 V
LOGIC LEVELS
CELLS Input Low Voltage 0.2 V
CELLS Input Middle Voltage 0.4
V
LDO
V
CELLS Input High Voltage
V
LDO
V
CELLS Input Bias Current
CELLS = 0 or V
LDO
-10
µA ACOK Sink Current
V
ACOK
= 0.4V
1 mA
ACOK Leakage Current
V
ACOK
= 5.5V
-1 +1 µA
SYMBOL
MIN TYP MAX
-0.5
-0.5
1.20 1.92
0.95 1.00 1.05
0.85 1.00 1.15
- 0.25
+0.5
+0.5
+10
+15 +20 +10 +10
- 0.5
V
LDO
+10
MAX1772
Low-Cost, Multichemistry Battery-
Charger Building Block
_______________________________________________________________________________________ 5
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 ✕REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- VLX= 4.5V, GND = PGND = 0, 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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
V
DCIN
8.0
V
DCIN falling 7
DCIN Undervoltage Lockout
Trip Point
DCIN rising
V
DCIN Quiescent Current
I
DCIN
8.0V < V
DCIN
< 28V
6 mA
LDO Output Voltage
8.0V < V
DCIN
< 28V, no load
V
TRIP POINTS
BATT POWER_FAIL Threshold
V
CSSP
falling
50
mV
BATT POWER_FAIL Threshold
Hysteresis
mV
ACIN Threshold ACIN rising
V ACIN Threshold Hysteresis 0.5% of REF 10 30 mV ACIN Input Bias Current
V
ACIN
= 2.048V
-1 +1 µA
CLS Input Range 1.6
V CLS Input Bias Current
V
CLS
= 2.0V
-1 +1 µA
SWITCHING REGULATOR
Minimum Off-Time
V
BATT
= 16.8V
1 1.5 µs Maximum On-Time 5 15 ms Oscillator Frequency
f
OSC
(Note 1)
kHz
DHI Maximum Duty Cycle 99 %
V
BATT
= 19V, V
DCIN
= 0
5
BATT Input Current
I
BATT
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
µA
V
DCIN
= 0
5
CSIP/CSIN Input Current
V
CSIP
= V
CSIN
= 12V
µA
V
DCIN
= 0
0.3
CSSP/CSSN Input Current
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
µA
BATT/CSIP/CSIN Input Voltage
Range
0 19 V
CSIP to CSIN Full-Scale
Current-Sense Voltage
V
BATT
= 12V
mV
CSSP to CSSN Full-Scale
Current-Sense Voltage
mV
CURRENT AND VOLTAGE SETTING
ICTL = REFIN (see Equation 2) -8 +8
Charging Current Accuracy
ICTL = REFIN/32 (see Equation 2) -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
5.25
100
2.007
189
189
28.0
7.85
5.65
150
300
2.089
REF
400
500
800
800
219
219
+55
MAX1772
Low-Cost, Multichemistry Battery­Charger Building Block
6 _______________________________________________________________________________________
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 ✕REFIN, CELLS = 2.0V,
ACIN = 0, CLS = REF, V
BST
- VLX= 4.5V, GND = PGND = 0, 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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ICTL Power-Down Mode
Threshold Voltage
REFIN
REFIN
/33
V
V
VCTL
= V
REFIN
(2, 3, or 4 cells)
(see Equation 1)
-1 +1
Battery Regulation Voltage
Accuracy
V
VCTL
= V
REFIN
/20 (2, 3, or 4 cells)
(see Equation 1)
-1 +1
%
REFIN Range 2.0 3.6 V REFIN Undervoltage Lockout
V
V
CSIP
- V
CSIN
= 0.185V
-5 +5
ICHG Accuracy
V
CSIP
- V
CSIN
= 0.05V
-10
%
V
CSSP
- V
CSSN
= 0.185V
-15
IINP Current Accuracy
V
CSSP
- V
CSSN
= 0.05V
(Note 2)
-20
%
V
CSSP
- V
CSSN
= 0.08V, V
CLS
= 1.6V
-10
CSSP - CSSN Accuracy
V
CSSP
- V
CSSN
= 0.2V, CLS = REF
-10
%
CSSP + CSSN Input Voltage
Range
8 28 V
LOGIC LEVELS
CELLS Input Low Voltage 0.2 V
CELLS Input Middle Voltage 0.4
V
LDO
V
CELLS Input High Voltage
V
LDO
V
CELLS Input Bias Current
CELLS = 0 or V
LDO
-10
µA
ACOK Sink Current
V
ACOK
= 0.4V
1 mA ACOK Leakage Current
V
ACOK
= 5.5V
-1 +1 µA
Note 1: Guaranteed by design. Not production tested. Note 2: Tested under DC conditions. See text for more detail.
/100
1.92
+10 +15 +20 +10 +10
- 0.25
- 0.5
V
LDO
+10
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