MAX1647 Datasheet, PDF (13/24 Pages) Maxim Integrated Products – Chemistry-Independent Battery Chargers

Chemistry-Independent
Battery Chargers
REF
10k
10k
10k
10k
DCIN
16mA 8mA 4mA
2mA 1mA
THERMISTOR_OR
5
IOUT
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 3.9V
REF
REFERENCE
100k 30k
3k
500Ω
AGND
AGND
CS
CURRENT-SENSE
LEVEL SHIFT AND
BATT
GAIN OF 5.5
CCV_LOW
CCV
3R
REF
R
AGND
REF
FROM LOGIC
BLOCK
6
6-BIT DAC
R
FROM LOGIC BLOCK
R
R
BATT
AGND ^{TO LOGIC BLOCK}
TO LOGIC BLOCK
R
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
R
VOLTAGE_INREG
MIN
CURRENT_INREG ^CLAMP
CLAMP
TO REF
(MAX)
SUMMING
COMPARATOR
BLOCK
BST
DRIVER
DHI
LX
VL
DRIVER
DLO
RR R
GMV
CCV
AGND ^{FROM LOGIC}
BLOCK
PGND
AGND
REF
FROM LOGIC BLOCK
10 _{10-BIT DAC}
DACV
AGND
TO LOGIC BLOCK
POWER_FAIL
DCIN/4.5
Figure 6a. MAX1647 Block Diagram
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