19-1158; Rev 1; 12/02
Chemistry-Independent Battery Chargers
_______________General Description
The MAX1647/MAX1648 provide the power control neces-
sary to charge batteries of any chemistry. In the MAX1647,
all charging functions are controlled through the Intel
System Management Bus (SMBus™) interface. The
SMBus 2-wire serial interface sets the charge voltage and
current, and provides thermal status information. The
MAX1647 functions as a level 2 charger, compliant with
the Duracell/Intel Smart Battery Charger Specification. The
MAX1648 omits the SMBus serial interface, and instead
sets the charge voltage and current proportional to the
voltage applied to external control pins.
In addition to the feature set required for a level 2 charger,
the MAX1647 generates interrupts to signal the host when
power is applied to the charger or a battery is installed or
removed. Additional status bits allow the host to check
whether the charger has enough input voltage, and
whether the voltage on or current into the battery is being
regulated. This allows the host to determine when lithium-
ion batteries have completed charge without interrogating
the battery.
The MAX1647 is available in a 20-pin SSOP with a 2mm
profile height. The MAX1648 is available in a 16-pin SO
package.
____________________________Features
o
Charges Any Battery Chemistry:
Li-Ion, NiCd, NiMH, Lead Acid, etc.
o
Intel SMBus 2-Wire Serial Interface (MAX1647)
o
Intel/Duracell Level 2 Smart Battery Compliant
(MAX1647)
o
4A, 2A, or 1A Maximum Battery-Charge Current
o
11-Bit Control of Charge Current
o
Up to 18V Battery Voltage
o
10-Bit Control of Voltage
o
±0.75% Voltage Accuracy with External ±0.1%
Reference
o
Up to 28V Input Voltage
o
Battery Thermistor Fail-Safe Protection
MAX1647/MAX1648
______________Ordering Information
PART
MAX1647EAP
MAX1648ESE
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 SSOP
16 Narrow SO
________________________Applications
Notebook Computers
Personal Digital Assistants
Charger Base Stations
Phones
__________________________________________________________Pin Configurations
TOP VIEW
IOUT
1
20 BST
19 LX
18 DHI
17 DLO
DCIN 1
VL 2
CCV 3
CCI 4
CS 5
BATT 6
REF 7
AGND 8
16 BST
15 LX
14 DHI
DCIN 2
VL 3
CCV 4
CCI
5
MAX1647
16 PGND
15 DACV
14 SDA
13 SCL
12 THM
11 INT
MAX1648
13 DLO
12 PGND
11 SETV
10 SETI
9
THM
SEL 6
CS
BATT
REF
7
8
9
AGND 10
SO
SSOP
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.
Chemistry-Independent Battery Chargers
MAX1647/MAX1648
ABSOLUTE MAXIMUM RATINGS
DCIN to AGND..........................................................-0.3V to 30V
DCIN to IOUT...........................................................-0.3V to 7.5V
BST to AGND ............................................................-0.3V to 36V
BST, DHI to LX ............................................................-0.3V to 6V
LX to AGND ..............................................................-0.3V to 30V
THM, CCI, CCV, DACV, REF,
DLO to AGND ................................................-0.3V to (VL + 0.3V)
VL, SEL,
INT,
SDA, SCL to AGND (MAX1647) ...........-0.3V to 6V
SETV, SETI to AGND (MAX1648)................................-0.3V to 6V
BATT, CS+ to AGND.................................................-0.3V to 20V
PGND to AGND .....................................................-0.3V to +0.3V
SDA,
INT
Current ................................................................50mA
VL Current ...........................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SO (derate 8.7mW/°C above +70°C).................696mW
20-Pin SSOP (derate 8mW/°C above +70°C) ...............640mW
Operating Temperature Range
MAX1647EAP, MAX1648ESE ...........................-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
(V
DCIN
= 18V, V
REF
= 4.096V,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
SUPPLY AND REFERENCE
DCIN Input Voltage Range
DCIN Quiescent Current
VL Output Voltage
VL Load Regulation
VL AC_PRESENT Trip Point
REF Output Voltage
REF Overdrive Input Current
SWITCHING REGULATOR
Oscillator Frequency
DHI Maximum Duty Cycle
DHI On-Resistance
DLO On-Resistance
BATT Input Current (Note 1)
CS Input Current (Note 1)
BATT, CS Input Voltage Range
CS to BATT Single-Count
Current-Sense Voltage
CS to BATT Full-Scale
Current-Sense Voltage
MAX1647, SEL = open,
ChargingCurrent( ) = 0x0020
MAX1647, SEL = open,
ChargingCurrent( ) = 0x07F0;
MAX1648, V
SETI
= 1.024V
MAX1647, ChargingVoltage( ) = 0x1060,
ChargingVoltage( ) = 0x3130; MAX1648,
V
SETV
= 3.15V, V
SETV
= 1.05V
170
High or low
High or low
VL < 3.2V, V
BATT
= 12V
VL < 5.15V, V
BATT
= 12V
VL < 3.2V, V
CS
= 12V
VL < 5.15V, V
CS
= 12V
0
2.94
200
89
250
93
4
6
1
350
1
170
7
14
5
500
5
400
19
300
kHz
%
Ω
Ω
µA
µA
V
mV
7.5V < V
DCIN
< 28V, logic inputs = VL
7.5V < V
DCIN
< 28V, no load
I
LOAD
= 10mA
MAX1647
0µA < I
SOURCE
< 500µA
3.20
3.74
4
3.9
5.15
7.5
4
5.4
28.0
6
5.65
100
5.15
4.07
700
V
mA
V
mV
V
V
µA
CONDITIONS
MIN
TYP
MAX
UNITS
185
200
mV
Voltage Accuracy
-0.65
+0.65
%
2
_______________________________________________________________________________________
Chemistry-Independent Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= 18V, V
REF
= 4.096V,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMV Amplifier Maximum
Output Current
GMI Amplifier Maximum
Output Current
CCI Clamp Voltage with
Respect to CCV
CCV Clamp Voltage with
Respect to CCI
1.1V < V
CCV
< 3.5V
1.1V < V
CCI
< 3.5V
25
25
1.4
0.2
±80
±200
80
80
200
200
mA/V
mA/V
µA
µA
mV
mV
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1647/MAX1648
TRIP POINTS AND LINEAR CURRENT SOURCES
BATT POWER_FAIL Trip Point
THM THERMISTOR_OR
Over-Range Trip Point
THM THERMISTOR_COLD
Trip Point
THM THERMISTOR_HOT
Trip Point
THM THERMISTOR_UR
Under-Range Trip Point
IOUT Output Current
IOUT Operating Voltage Range
CDAC Current-Setting DAC Resolution
VDAC Voltage-Setting DAC Resolution
SETV, SETI
(MAX1648)
SETV Input Bias Current
SETI Input Bias Current
SETV Input Voltage Range
SETI Input Voltage Range
LOGIC LEVELS
(MAX1647)
SDA, SCL Input Low Voltage
SDA, SCL Input High Voltage
SDA, SCL Input Bias Current
SDA Output Low Sink Current
V
SDA
= 0.6V
2.8
-1
6
+1
0.8
V
V
µA
mA
0
0
1
5
4.2
1.024
µA
µA
V
V
MAX1647
MAX1647,
V
DCIN
= 7.5V,
V
IOUT
= 0V
ChargingCurrent( ) = 0x001F
ChargingCurrent( ) = 0x0000
-7.5
6
10
MAX1647
MAX1647
86.5
89.5
74
22
3
25
89
91
75.5
23.5
4.5
31
91.5
92.5
77
25
6
38
10
-1.0
% of
V
DCIN
% of
V
REF
% of
V
REF
% of
V
REF
% of
V
REF
mA
µA
V
Bits
Bits
With respect to DCIN voltage
Guaranteed monotonic
Guaranteed monotonic
CURRENT- AND VOLTAGE-SETTING DACs
(MAX1647)
Note 1:
When DCIN is less than 4V, VL is less than 3.2V, causing the battery current to be typically 2µA (CS plus BATT input
current).
_______________________________________________________________________________________
3
Chemistry-Independent Battery Chargers
MAX1647/MAX1648
ELECTRICAL CHARACTERISTICS
(V
DCIN
= 18V, V
REF
= 4.096V,
T
A
= -40°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise noted. Limits over this
temperature range are guaranteed by design.)
PARAMETER
SUPPLY AND REFERENCE
DCIN Quiescent Current
VL Output Voltage
REF Output Voltage
SWITCHING REGULATOR
Oscillator Frequency
DHI Maximum Duty Cycle
DHI On-Resistance
DLO On-Resistance
BATT Input Current
CS Input Current
CS to BATT Full-Scale
Current-Sense Voltage
High or low
High or low
VL < 3.2V, V
BATT
= 12V
VL < 3.2V, V
CS
= 12V
MAX1647, SEL = open,
ChargingCurrent( ) = 0x07F0;
MAX1648, V
SETI
= 1.024V
MAX1647, ChargingVoltage( ) = 0x1060,
ChargingVoltage( ) = 0x3130; MAX1648,
V
SETV
= 3.15V, V
SETV
= 1.05V
160
185
200
89
4
6
7
14
5
5
200
250
310
kHz
%
Ω
Ω
µA
µA
mV
7.5V < V
DCIN
< 28V, logic inputs = VL
7.5V < V
DCIN
< 28V, no load
0µA < I
SOURCE
< 500µA
5.15
3.74
4
5.4
3.9
6
5.65
4.07
mA
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
Voltage Accuracy
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMV Amplifier Maximum
Output Current
GMI Amplifier Maximum
Output Current
-0.65
+0.65
%
1.4
0.2
±130
±320
mA/V
mA/V
µA
µA
TRIP POINTS AND LINEAR CURRENT SOURCES
THM THERMISTOR_OR
Over-Range Trip Point
THM THERMISTOR_COLD
Trip Point
THM THERMISTOR_HOT
Trip Point
THM THERMISTOR_UR
Under-Range Trip Point
SETV, SETI
(MAX1648)
SETV Input Bias Current
SETI Input Bias Current
LOGIC LEVELS
(MAX1647)
SDA, SCL Input Low Voltage
SDA, SCL Input High Voltage
SDA, SCL Input Bias Current
SDA Output Low Sink Current
4
V
SDA
= 0.6V
2.8
-1
6
+1
0.8
V
V
µA
mA
1
5
µA
µA
MAX1647
MAX1647
89.5
74
22
3
91
75.5
23.5
4.5
92.5
77
25
6
% of
V
REF
% of
V
REF
% of
V
REF
% of
V
REF
_______________________________________________________________________________________
Chemistry-Independent Battery Chargers
TIMING CHARACTERISTICS—MAX1647
(T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
SCL Serial-Clock High Period
SCL Serial-Clock Low Period
Start-Condition Setup Time
Start-Condition Hold Time
SDA Valid to SCL Rising-Edge
Setup Time, Slave Clocking in Data
SCL Falling Edge to SDA Transition
SCL Falling Edge to SDA Valid,
Master Clocking in Data
SYMBOL
t
HIGH
t
LOW
t
SU:STA
t
HD:STA
t
SU:DAT
t
HD:DAT
t
DV
CONDITIONS
MIN
4
4.7
4.7
4
250
0
1
TYP
MAX
UNITS
µs
µs
µs
µs
ns
ns
µs
MAX1647/MAX1648
TIMING CHARACTERISTICS—MAX1647
(T
A
= -40°C to +85°C,
unless otherwise noted. Limits over this temperature range are guaranteed by design.)
PARAMETER
SCL Serial-Clock High Period
SCL Serial-Clock Low Period
Start-Condition Setup Time
Start-Condition Hold Time
SDA Valid to SCL Rising-Edge
Setup Time, Slave Clocking in Data
SCL Falling Edge to SDA Transition
SCL Falling Edge to SDA Valid,
Master Clocking in Data
SYMBOL
t
HIGH
t
LOW
t
SU:STA
t
HD:STA
t
SU:DAT
t
HD:DAT
t
DV
CONDITIONS
MIN
4
4.7
4.7
4
250
0
1
TYP
MAX
UNITS
µs
µs
µs
µs
ns
ns
µs
_______________________________________________________________________________________
5
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