8731AE Datasheet PDF - Maxim Integrated Products
Part Number | 8731AE | |
Description | MAX8731A | |
Manufacturers | Maxim Integrated Products | |
Logo | ||
There is a preview and 8731AE download ( pdf file ) link at the bottom of this page. Total 32 Pages |
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EVAALVUAAILTAIOBNLEKIT
SMBus Level 2 Battery Charger
with Remote Sense
General Description
The MAX8731A is an SMBus™ programmable multi-
chemistry battery charger. The MAX8731A uses a mini-
mal command set to easily program the charge voltage,
charge current, and adapter current limit.
The MAX8731A charges one to four Li+ series cells and
delivers up to 8A charge current. The MAX8731A drives
n-channel MOSFETs for improved efficiency and
reduced cost. Low-offset current-sense amplifiers pro-
vide high accuracy with 10mΩ sense resistors.
The MAX8731A current-sense amplifiers provide high
accuracy (3% at 3.5A) and also provide fast cycle-by-
cycle current-mode control to protect against battery
short circuit and system load transients.
The charger employs dual remote sense, which reduces
charge time by measuring the feedback voltage directly
at the battery, improving accuracy of initial transition into
constant-voltage mode. The MAX8731A provides 0.5%
battery voltage accuracy directly at the battery terminal.
The MAX8731A provides a digital output that indicates
the presence of the AC adapter, as well as an analog out-
put that indicates the adapter current within 4% accuracy.
The MAX8731A is available in a small 5mm x 5mm,
28-pin, thin (0.8mm) QFN package. An evaluation kit is
available to reduce design time. The MAX8731A is avail-
able in a lead-free package.
SMBus is a trademark of Intel Corp.
Applications
Notebook Computers
Tablet PCs
www.DataMSheedeitc4aUl.cDomevices
Portable Equipment with Rechargeable Batteries
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
DCIN 22
LX 23
DHI 24
BST 25
VCC 26
CSSN 27
CSSP 28
MAX8731A
*EXPOSED PADDLE
14 BATSEL
13 ACOK
12 GND
11 VDD
10 SCL
9 SDA
8 IINP
1 234567
Features
♦ 0.5% Battery Voltage Accuracy
♦ 3% Input Current-Limit Accuracy
♦ 3% Charge-Current Accuracy
♦ SMBus 2-Wire Serial Interface
♦ Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
♦ Dual-Remote-Sense Inputs
♦ Monitor Outputs for
Adapter Current (4% Accuracy)
AC Adapter Detection
♦ 11-Bit Battery Voltage Setting
♦ 6-Bit Charge-Current/Input-Current Setting
♦ 8A (max) Battery Charger Current
♦ 11A (max) Input Current
♦ +8V to +26V Input Voltage Range
♦ Charges Li+, NiMH, and NiCd Battery Chemistries
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX8731AETI+
-40°C to +85°C
28 Thin QFN
(5mm x 5mm)
T2855-6
+Indicates a lead-free package.
Typical Operating Circuit
OPTIONAL
HOST
SCL
SDA
VDD
CSSP
ACIN
DCIN
ACOK
CSSN
DHI
LX
MAX8731A DLO
REF PGND
BST
CSIP
GND CSIN
BATSEL
SCL
SDA
VDD
FBSA
FBSB
GND LDO
VCC
IINP CCV
DAC CCS CCI
EXTERNAL LOAD
N
N
SELECTOR
BATSEL
BATTERY
A
BATTERY
B
THIN QFN
5mm x 5mm
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
|
|
SMBus Level 2 Battery Charger
with Remote Sense
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VLX = VCSSP = VCSSN = 19V, VBST - VLX = 4.5V, VFBSA = VFBSB = VCSIP = VCSIN = 16.8V, BATSEL = GND = PGND = 0,
CLDO = 1µF, VCC = LDO, CREF = 1µF, CDAC = 0.1µF, VDD = 3.3V, ACIN = 2.5V; pins CCI, CCV, and CCS are compensated per
Figure 1; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
ERROR AMPLIFIERS
GMV Amplifier Transconductance ChargingVoltage() = 16.8V, VFBS_ = 16.8V
GMI Amplifier Transconductance ChargingCurrent() = 3968mA, VCSIP - VCSIN = 39.68mV
GMS Amplifier Transconductance InputCurrent() = 3968mA, VCSSP - VCSSN = 79.36mV
CCI/CCS/CCV Clamp Voltage
0.25V < VCCI/S/V < 2.0V
LOGIC LEVELS
SDA/SCL Input-Low_Voltage
VDD = 2.7V to 5.5V
SDA/SCL Input-High_Voltage
SDA/SCL Input Bias Current
VDD = 2.7V to 5.5V
VDD = 2.7V to 5.5V
BATSEL Input-Low_Voltage
BATSEL Input-High_Voltage
BATSEL Input Bias Current
SDA, Output Sink Current
V(SDA) = 0.4V
SMBus TIMING SPECIFICATIONS (VDD = 2.7V to 5.5V) (see Figures 4 and 5)
PARAMETERS
SYMBOL
CONDITIONS
SMBus Frequency
fSMB
Bus Free Time
tBUF
Start Condition Hold Time from
SCL
tHD:STA
MIN TYP MAX UNITS
0.0625
0.5
0.5
120
0.125
1.0
1.0
250
0.2500
2.0
2.0
600
mA/V
mA/V
mA/V
mV
0.8 V
2.1 V
-1 +1 µA
0.8 V
2.1 V
-1 +1 µA
6 mA
MIN TYP MAX UNITS
10 100 kHz
4.7 µs
4 µs
Start Condition Setup Time from
SCL
tSU:STA
4.7 µs
www.DaStatoSpheCeot4nUdi.tcionmSetup Time from
SCL
SDA Hold Time from SCL
SDA Setup Time from SCL
SCL Low Timeout
SCL Low Period
SCL High Period
Maximum Charging Period
Without a ChargeVoltage() or
ChargeCurrent() Command
tSU:STO
tHD:DAT
tSU:DAT
tTIMEOUT
TLOW
THIGH
(Note 1)
4
300
250
25 35
4.7
4
140 175 210
µs
ns
ns
ms
µs
µs
s
_______________________________________________________________________________________ 5
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