MAX1667EAP+ Maxim Integrated Products, MAX1667EAP+ Datasheet - Page 21

• Manufacturer Part Number: MAX1667EAP+
• Description: IC SMART BATT CHGR LEVEL2 20SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1667EAP+

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 7.5 V ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note 1: THERMISTOR_HOT and HOT_STOP and NOT (THERMISTOR_UR).
If reverse-polarity protection for the DC input power is
not necessary, diode D4 can be omitted. This eliminates
the power lost due to the voltage drop on diode D4.
Figure 11 represents the expected electrical behavior
of a 103ETB-type thermistor (nominally 10kΩ at +25°C
±5% or better) to be used with the MAX1667. The
graph is typical of the suggested thermistor’s charac-
teristics.
THERMISTOR_OR bit is set only when the thermistor
value is > 100kΩ. This indicates that the thermistor is
open.
THERMISTOR_COLD bit is set only when the thermistor
value is > 30kΩ. The thermistor indicates a cold bat-
tery.
Table 4. ChargingCurrent() Bit Functions
* When SEL = VL, values above 0x0F80 set the output current to 3.968A.
** Values below 0x0080 set the output current to 7mA.
Table 5. Relationship Between IOUT Source Current and ChargingCurrent() Value
CHARGE_
INHIBITED
When SEL = OPEN, values above 0x0B80 set the output current to 2.944A.
When SEL = GND, values above 0x0380 set the output current to 0.896A.
(R
WEIGHT IN mA
BIT POSITION
0
0
0
0
0
0
0
0
0
0
0
1
SENSE
FUNCTION
= 40mΩ)
(Note 1)
0
0
0
0
0
0
0
0
0
0
1
x
______________________________________________________________________________________
Thermistor Characterization
D15 D14 D13 D12 D11
INHIBITED
ALARM_
0
0
0
0
0
0
0
0
0
1
x
x
3968*
FS*
ChargingVoltage()
x0x0010–0xFFFF
0x0000–0x000F
0x0010–0xFFFF
0x0010–0xFFFF
0x0010–0xFFFF
0x0010–0xFFFF
0x0010–0xFFFF
0x0010–0xFFFF
Level 2 Smart Battery Charger
2048
DA4
x
x
x
x
1024
DA3
D10
Chemistry-Independent,
DA2
512
ChargingCurrent()
D9
0x0001–0x0007
0x0001–0x0007
0x0001–0x0007
0x0008–0x007F
0x0008–0x007F
0x0008–0x007F
0x0080–0xFFFF
THERMISTOR_HOT bit is set only when the thermistor
value is < 3kΩ.
THERMISTOR_UR bit is set only when the thermistor
value is < 500Ω.
Multiple bits may be set depending on the values of the
thermistor (e.g., a 450Ω thermistor will cause both the
THERMISTOR_HOT and the THERMISTOR_UR bits to
be set). The thermistor may be replaced by fixed-value
resistors in battery packs that do not require the ther-
mistor as a secondary fail-safe indicator. In this case, it
is the responsibility of the battery pack to manipulate
the resistance to obtain correct charger behavior.
0x0000
DA1
256
D8
x
x
x
x
DA0
128
D7
CCV_LOW
D6
0
1
1
0
1
1
x
x
x
x
x
x
D5
VOLTAGE_
D4
NOTREG
IOUT**
x
x
x
0
1
x
0
1
x
x
x
x
7**
D3
D2
CURRENT (mA)
OUTPUT
I
D1
OUT
0
0
7
0
7
7
0
7
0
0
0
0
D0
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