19-1488; Rev 1; 5/03
Chemistry-Independent,
Level 2 Smart Battery Charger
General Description
The MAX1667 provides the power control necessary to
charge batteries of any chemistry. 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 MAX1667 functions as a Level 2
charger, compliant with the Duracell/Intel Smart Battery
Charger Specification.
In addition to the feature set required for a Level 2 charg-
er, the MAX1667 generates interrupts to signal the host
when power is applied to the charger or when 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 (Li+) batteries have completed the charge with-
out interrogating the battery.
The MAX1667 is available in a 20-pin SSOP with a 2mm
profile height.
____________________________Features
o
Charges Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
o
SMBus 2-Wire Serial Interface
o
Compliant with Duracell/Intel Smart Battery
Charger Specification Rev. 1.0
o
4A, 3A, or 1A (max) Battery Charge Current
o
5-Bit Control of Charge Current
o
Up to 18.4V Battery Voltage
o
11-Bit Control of Voltage
o
±1% Voltage Accuracy
o
Up to +28V Input Voltage
o
Battery Thermistor Fail-Safe Protection
o
Greater than 95% Efficiency
o
Synchronous Rectifier
MAX1667
________________________Applications
Notebook Computers
Personal Digital Assistants
Charger Base Stations
Phones
PART
MAX1667EAP
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
CHARGE SOURCE
DCIN
IOUT
VL
REF
BST
DHI
LX
V
DD
DLO
PGND
INT
CS
R
SENSE
BATT+
SCL
SMART
SDA BATTERY
TEMP
BATT-
HOST
CONTROLLER
SCL
SDA
INT
GND
AGND
SEL
DACV
CCV
MAX1667
BATT
SCL
SDA
THM
CCI
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,
Level 2 Smart Battery Charger
MAX1667
ABSOLUTE MAXIMUM RATINGS
DCIN to AGND .......................................................-0.3V to +30V
BST to AGND..........................................................-0.3V to +36V
BST, DHI to LX..........................................................-0.3V to +6V
LX, IOUT 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 ............................-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)
SSOP (derate 8mW/°C above +70°C) ..........................640mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-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, internal reference, 1µF capacitor at REF, 1µF capacitor at VL,
T
A
= 0°C to +85°C,
unless otherwise noted. 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
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
ChargingCurrent() = 0x0080 (128mA)
SEL = VL (4A),
ChargingCurrent() = 0x0F80 (3968mA)
ChargingVoltage()
= 0x3130 (12,592mV)
and
0x41A0 (16,800mV)
Voltage Accuracy
ChargingVoltage()
= 0x1060 (4192mV)
and
0x20D0 (8400mV)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
-1.0
-3.0
1.0
3.0
T
A
= +25°C
T
A
= T
MIN
to T
MAX
145
-0.8
-1.0
Not in dropout
In dropout
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
5
160
175
0.8
1.0
%
200
96.5
250
97.7
4
5
1
350
1
170
7
8
5
500
5
400
19
300
kHz
%
Ω
Ω
µA
µA
V
mV
mV
0 < I
SOURCE
< 500µA
7.5V < V
DCIN
< 28V, logic inputs = VL
7.5V < V
DCIN
< 28V, no load
I
LOAD
= 0 to 10mA
3.20
4.055
4
4.096
5.15
7.5
4
5.4
28
6
5.65
100
5.15
4.137
V
mA
V
mV
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Chemistry-Independent,
Level 2 Smart Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values
are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMV Amplifier Maximum
Output Current
GMI Amplifier Maximum
Output Current
CCV Clamp Voltage with
Respect to CCI
CCI Clamp Voltage with
Respect to CCV
1.1V < V
CCI
< 3.5V
1.1V < V
CCV
< 3.5V
25
25
1.4
0.2
±80
±200
80
80
200
200
mA/V
mA/V
µA
µA
mV
mV
MAX1667
TRIP POINTS AND LINEAR CURRENT SOURCES
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
THM THERMISTOR_OR
Overrange Trip Point
THM THERMISTOR_COLD
Trip Point
THM THERMISTOR_HOT
Trip Point
THM THERMISTOR_UR
Underrange Trip Point
THM THERMISTOR_OR, _COLD,
_HOT, _UR Trip Point Hysteresis
V
IOUT
= 0
IOUT Output Current
ChargingCurrent() = 0x0001
to 0x007F (127mA)
ChargingCurrent() = 0x0000
V
IOUT
= 17V, ChargingCurrent() = 0x0001
to 0x007F (127mA)
IOUT Leakage Current
CDAC Current-Setting DAC Resolution
VDAC Voltage-Setting DAC Resolution
LOGIC LEVELS
SDA, SCL Input Voltage Low
SDA, SCL Input Voltage High
SDA, SCL Input Bias Current
SDA Output Low Sink Current
V
SDA
= 0.6V
2.2
-1
6
1
0.8
V
V
µA
mA
V
DCIN
= 0, V
IOUT
= 20V
Guaranteed monotonic
Guaranteed monotonic
5
11
CURRENT- AND VOLTAGE-SETTING DACs
Bits
Bits
5
10
5
THM falling
THM falling
THM falling
THM falling
89
74
22
3
BATT rising
93
95
1
91
75.5
23.5
4.5
0.5
7
9
10
93
77
25
6
97
% of
V
DCIN
% of
V
DCIN
% of
V
REF
% of
V
REF
% of
V
REF
% of
V
REF
% of
V
DCIN
mA
µA
mA
µA
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,
Level 2 Smart Battery Charger
MAX1667
ELECTRICAL CHARACTERISTICS
(V
DCIN
= 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL,
T
A
= -40°C to +85°C,
unless otherwise noted. Typical values
are at T
A
= +25°C. 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 (Note 1)
CS Input Current (Note 1)
CS to BATT Full-Scale
Current-Sense Voltage
Not in dropout
In dropout
High or low
High or low
VL < 3.2V, V
BATT
= 12V
VL < 3.2V, V
CS
= 12V
V
SEL
= VL,
ChargingCurrent() = 0x0F80 (128mA)
ChargingVoltage() = 0x3130 (12,592mV),
ChargingVoltage() = 0x41A0 (16,800mV)
ChargingVoltage() = 0x1060 (4192mV),
ChargingVoltage() = 0x20D0 (8400mV)
145
-1.0
-3.0
160
200
96.5
4
5
7
8
5
5
175
1.0
%
3.0
250
310
kHz
%
Ω
Ω
µA
µA
mV
7.5V < V
DCIN
< 28V, logic inputs = VL
7.5V < V
DCIN
< 28V, no load
0 < I
SOURCE
< 500µA
5.15
4.055
4
5.4
6
5.65
4.137
mA
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
Voltage Accuracy
TRIP POINTS AND LINEAR CURRENT SOURCES
THM THERMISTOR_OR
Overrange Trip Point
THM THERMISTOR_COLD
Trip Point
THM THERMISTOR_HOT
Trip Point
THM THERMISTOR_UR
Underrange Trip Point
THM THERMISTOR_OR, _COLD,
_HOT, _UR Trip Point Hysteresis
LOGIC LEVELS
SDA, SCL Input Voltage Low
SDA, SCL Input Voltage High
SDA, SCL Input Bias Current
SDA Output Low Sink Current
V
SDA
= 0.6V
2.2
-1
6
1
0.5
V
V
µA
mA
THM falling
THM falling
THM falling
THM falling
88.5
73.5
21.5
2.5
1
93.5
77.5
25.5
6.5
% of
V
REF
% of
V
REF
% of
V
REF
% of
V
REF
%
4
_______________________________________________________________________________________
Chemistry-Independent,
Level 2 Smart Battery Charger
MAX1667
TIMING CHARACTERISTICS (Figures 1 and 2)
(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
TIMING CHARACTERISTICS (Figures 1 and 2)
(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
Microcontroller MCU
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