MAX8731EVSYS Maxim Integrated, MAX8731EVSYS Datasheet - Page 13

• Manufacturer Part Number: MAX8731EVSYS
• Description: Battery Management SMBus Level 2 Battery Charger with Remote Sense
• Manufacturer: Maxim Integrated
• Series: MAX8731Ar

Specifications of MAX8731EVSYS

• Battery Type: Li-Ion, Li-Polymer, NiCd, NiMH, Lead Acid, Universal
• Output Voltage: 5.4 V
• Operating Supply Voltage: 8 V to 26 V
• Charge Safety Timers: Yes
• Operating Supply Current: 2 uA
• Product Type: Charge Management
• Temperature Monitoring: No
• Uvlo Start Threshold: 2.5 V
• Uvlo Stop Threshold: 100 mV

1, 12
PIN
10
11
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
2
3
4
5
6
7
8
9
BATSEL
SMBus Level 2 Battery Charger with
NAME
ACOK
PGND
CSSN
FBSA
FBSB
DCIN
CSSP
ACIN
CSIN
GND
CSIP
CCS
CCV
DAC
DLO
LDO
IINP
SDA
SCL
REF
V
BST
V
CCI
DHI
______________________________________________________________________________________
BP
LX
DD
CC
Analog Ground. Connect directly to the paddle.
AC Adapter Detect Input. ACIN is the input to an uncommitted comparator.
4.096V Voltage Reference. Bypass REF with a 1µF capacitor to GND.
Input Current Regulation Loop-Compensation Point. Connect 0.01µF from CCS to GND.
Output Current Regulation Loop-Compensation Point. Connect 0.01µF from CCI to GND.
Voltage Regulation Loop-Compensation Point. Connect 10kΩ in series with 0.01µF to GND.
DAC Voltage Output. Bypass with 0.1µF from DAC to GND.
Input Current Monitor Output. IINP sources the current proportional to the current sensed across
CSSP and CSSN. The transconductance from (CSSP - CSSN) to IINP is 3mA/V.
S M Bus D ata I/O. Op en- d r ai n outp ut. C onnect an exter nal p ul l up r esi stor accor d i ng to S M Bus sp eci fi cati ons.
SMBus Clock Input. Connect an external pullup resistor according to SMBus specifications.
Logic Circuitry Supply-Voltage Input. Bypass with a 0.1µF capacitor to GND.
AC D etect Outp ut. Thi s op en- d r ai n outp ut i s hi g h i m p ed ance w hen AC IN i s g r eater than RE F/2. The
AC O K outp ut r em ai ns l ow w hen the M AX 8731 i s p ow er ed d ow n. C onnect a 10kΩ p ul l up r esi stor fr om
V
Batter y V ol tag e S el ect Inp ut. D r i ve BATS E L hi g h to sel ect b atter y B, or d r i ve BATS E L l ow to sel ect b atter y A.
Any chang e of BATS E L i m m ed i atel y stop s char g i ng . C har g i ng b eg i ns ag ai n i n ap p r oxi m atel y 10m s.
Remote Sense Input for the Output Voltage of Battery A. Connect a 100Ω resistor from FBSA to the
battery connector, and a 10nF capacitor from FBSA to PGND.
Remote Sense Input for the Output Voltage of Battery B. Connect a 100Ω resistor from FBSB to the
battery connector, and a 10nF capacitor from FBSB to PGND.
Charge Current-Sense Negative Input
C har g e C ur r ent- S ense P osi ti ve Inp ut. C onnect a 10m Ω cur r ent- sense r esi stor b etw een C S IP and C S IN .
Power Ground
Low-Side Power MOSFET Driver Output. Connect to low-side n-channel MOSFET. DLO drives
between LDO and PGND.
Linear-Regulator Output. LDO is the output of the 5.4V linear regulator supplied from DCIN. LDO also
directly supplies the DLO driver and the BST charge pump. Bypass with a 1µF ceramic capacitor
from LDO to PGND.
Charger Bias Supply Input. Bypass DCIN with a 0.1µF capacitor to PGND.
H i g h- S i d e P ow er M OS FE T D r i ver S our ce C onnecti on. C onnect to the sour ce of the hi g h- si d e n- channel
M OS FE T.
High-Side Power MOSFET Driver Output. Connect to the high-side n-channel MOSFET gate.
H i g h- S i d e P ow er M OS FE T D r i ver P ow er - S up p l y C onnecti on. C onnect a 0.1µF cap aci tor fr om BS T to LX .
D evi ce P ow er - S up p l y Inp ut. C onnect to LD O thr oug h an RC fi l ter as show n i n Fi g ur e 1.
Input Current-Sense Negative Input
Inp ut C ur r ent- S ense P osi ti ve Inp ut. C onnect a 10m Ω cur r ent- sense r esi stor b etw een C S S P and C S S N .
Backside Paddle. Connect the backside paddle to analog ground.
C C
to AC O K.
FUNCTION
Remote Sense
Pin Description
13