MAX8731A Maxim Integrated Products, MAX8731A Datasheet - Page 15

• Manufacturer Part Number: MAX8731A
• Description: SMBus Level 2 Battery Charger
• Manufacturer: Maxim Integrated Products

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command. The charge current-regulation loop is in con-
trol as long as the selected battery voltage is below the
charge voltage set point. When the selected battery
voltage reaches its set point, the voltage-regulation
loop takes control and maintains the battery voltage at
Figure 2. Functional Diagram
ACOK
ACIN
GND
CCV
CCS
CCI
CSSP
CSIN
CSA: CURRENT-SENSE
AMPLIFIER
GM
______________________________________________________________________________________
MAX8731A
VCC
CSS
A = 20V/V
CSA
LOWEST VOLTAGE CLAMP
GMS
SMBus Level 2 Battery Charger
REF/2
POWER-FAIL
CSI
A = 20V/V
LVC
CSA
GMI
(750mA FOR RS2 = 10mΩ)
100mV
150mV
the set point. A third loop (CCS) takes control and
reduces the charge current when the adapter current
exceeds the input current limit set by the InputCurrent()
command.
A functional diagram is shown in Figure 2.
A = 1V/V
with Remote Sense
ENABLE
IMIN
CCMP
GMV
ZCMP
CONVERTER
DC-DC
11-BIT DAC
6-BIT DAC
6-BIT DAC
OVP
IMAX
200mV
+
-
CHARGE VOLTAGE ( )
CHARGE CURRENT ( )
INPUT CURRENT ( )
2V
(10A FOR RS2 = 10mΩ)
LEVEL
SHIFT
SMBus LOGIC
REGULATOR
LOW-
SIDE
DRIVER
REFERENCE
LINEAR
4.096V
HIGH-
SIDE
DRIVER
5.4V
BST
DHI
LX
LDO
DLO
PGND
DCIN
V
REF
SCL
SDA
V
CC
DD
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