MAX1667 Datasheet, PDF (13/28 Pages) Maxim Integrated Products – Chemistry-Independent, Level 2 Smart Battery Charger

Chemistry-Independent,
Level 2 Smart Battery Charger
REF
10k
10k
10k
10k
THERMISTOR_OR
DCIN
7mA
IOUT
MAX1667
THERMISTOR_COLD
THERM_SHUT
THERMAL
SHUTDOWN
LOGIC
SEL
THM
BLOCK
SCL
THERMISTOR_HOT
SDA
INT
DCIN
THERMISTOR_UR
VL
AC_PRESENT _{5.4V LINEAR}
REGULATOR
INTERNAL
4.096V
REF
REFERENCE
AGND
100k 30k
3k
500Ω
CS
CURRENT-SENSE
LEVEL SHIFT AND
BATT
GAIN OF 5.5
CCV_LOW
3R
R
AGND
AGND
CCV
REF
REF
FROM LOGIC ₅
BLOCK
5-BIT DAC
3R
R
FROM LOGIC BLOCK
BATT
AGND ^{TO LOGIC BLOCK}
TO LOGIC BLOCK
4R
3/8 REF = ZERO CURRENT
NOTE: APPROX. REF/4 + V_THRESH
CCI
TO 3/4 REF + V_THRESH
GMI
NOTE:
REF/4 TO 3/4 REF
LEVEL
SHIFT
VOLTAGE_INREG
MIN
CURRENT_INREG ^CLAMP
CLAMP
TO REF
(MAX)
SUMMING
COMPARATOR
BLOCK
BST
DRIVER
DHI
LX
VL
DRIVER
DLO
R
AGND
REF
GMV
CCV
AGND ^{FROM LOGIC}
BLOCK
PGND
FROM LOGIC BLOCK
11 _{11-BIT DAC}
DACV
AGND
TO LOGIC BLOCK
POWER_FAIL
DCIN/4.5
Figure 6. Functional Diagram
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