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8731AE 데이터시트 PDF




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기능 MAX8731A
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8731AE 데이터시트, 핀배열, 회로
19-0756; Rev 0; 1/07
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.




8731AE pdf, 반도체, 판매, 대치품
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
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage-Lockout Threshold
VDD Range
VDD UVLO Rising
VDD UVLO Hysteresis
VDD Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip Point
ACOK
ACOK Sink Current
ACOK Leakage Current
ACIN
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
REMOTE-SENSE INPUTS
FBS_ Range
FBS_ Gain
CSIN-FBS_ Clamp Voltage
www.DaFtaBSSh_eBetia4sU.Ccoumrrent
FBS_ Bias Current
SWITCHING REGULATOR
Off-Time
BST Supply Current
LX Input Bias Current
Maximum Discontinuous-Mode Peak
Current (IMIN)
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
CONDITIONS
8.0V < VDCIN < 28V, no load
0 < ILDO < 30mA
VDCIN = 8.0V, VLDO falling
DCIN < 6V, VDD = 5.5V, SCL = SDA = 5.5V
0 < IREF < 500µA
REF falling
VACOK = 0.4V, ACIN = 1.5V
VACOK = 5.5V, ACIN = 2.5V
VCSIN - VFBS
ΔVCSIN / Δ(VCSIN - VFBS_)
Charger switching, FBS_ selected
Charger not switching or FBS_ not selected
VCSIN = 16.0V, VCSSP = 19V
VCSIN = 16.0V, VCSSP = 17V
DHI high
VDCIN = 28V, VCSIN = VLX = 20V, DHI low
IDHI = -10mA
IDHI = 10mA
IDLO = 10mA
IDLO = -10mA
MIN
5.25
3.20
2.7
TYP
5.4
34
4.00
2.5
100
16
MAX
5.55
100
5.15
5.5
2.7
27
UNITS
V
mV
V
V
V
mV
µA
4.071
4.096
3.1
4.120
3.9
V
V
1 mA
1 µA
2.007
10
-1
2.048
20
2.089
30
+1
V
mV
µA
0 200
0.95 1.00 1.05
225 250 275
14
-2 +2
mV
V/V
mV
µA
µA
360 400 440
260 300 360
500 800
2
0.5
13
35
35
13
ns
µA
µA
A
Ω
Ω
Ω
Ω
4 _______________________________________________________________________________________

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8731AE 전자부품, 판매, 대치품
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 = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
INPUT-CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
VFBS_ = 19V
103.3
116.6 mV
Input Current Accuracy
RS1, Figure 1 = 10mΩ;
InputCurrent() = 11004mA or 3584mA
RS1, Figure 1 = 10mΩ;
InputCurrent() = 2048mA
-6 +6
%
-5 +5
Input Current-Limit Gain Error
Based on InputCurrent() = 1024mA and 11004mA
Input Current-Limit Offset
Based on InputCurrent() = 1024mA and 11004mA
CSSP/CSSN Input Voltage Range
IINP Transconductance
IINP Offset
VCSSP - CSSN = 110mV
Based on VCSSP - CSSN = 110mV and 20mV
IINP Accuracy
VCSSP - CSSN = 110mV
VCSSP - CSSN = 55mV or 35mV
VCSSP - CSSN = 20mV
IINP Output Voltage Range
SUPPLY AND LINEAR REGULATOR
DCIN, Input Voltage Range
DCIN Undervoltage-Lockout
Trip Point
DCIN falling
DCIN rising
POWER_FAIL Threshold
www.DataSheet4U.com
LDO Output Voltage
VCSSP - VCSIN falling
VCSSP - VCSIN rising
8.0V < VDCIN < 28V, no load
LDO Load Regulation
0 < ILDO < 30mA
LDO Undervoltage-Lockout
Threshold
VDCIN = 8.0V, VLDO falling
-5
-1
8
2.7
-1.5
-5
-4
-10
0
8.0
7
9
160
5.25
3.20
+5
+1
26
3.3
+1.5
+5
+4
+10
3.5
%
mV
V
mA/V
mV
%
V
26.0 V
7.85
21
mV
271
5.55 V
100 mV
5.15 V
VDD Range
VDD UVLO Rising
VDD Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout
Trip Point
DCIN < 6V, VDD = 5.5V, SCL = SDA = 5.5V
0 < IREF < 500µA
REF falling
2.7
4.053
5.5 V
2.7 V
27 µA
4.139
3.9
V
V
ACOK
ACOK Sink Current
VACOK = 0.4V, ACIN = 1.5V
1 mA
_______________________________________________________________________________________ 7

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부품번호상세설명 및 기능제조사
8731AE

MAX8731A

Maxim Integrated Products
Maxim Integrated Products

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