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| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/32页 |
| 文件大小： | 0K |
| 描述： | IC SMBUS LVL2 BATT CHRGR 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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SMBus Level 2 Battery Charger
with Remote Sense
Table 4 . Battery-Charger Command Summary
COMMAND
0x14
0x15
0x3F
0xFE
0xFF
COMMAND NAME
ChargeCurrent()
ChargeVoltage()
InputCurrent()
ManufacturerID()
DeviceID()
READ/WRITE
Write Only
Write Only
Write Only
Read Only
Read Only
DESCRIPTION
6-Bit Charge-Current Setting
11-Bit Charge-Voltage Setting
6-Bit Charge-Current Setting
Manufacturer ID
Device ID
POR STATE
0x0000
0x0000
0x0080
0x004D
0x0008
Battery-Charger Commands
The MAX8731A supports four battery-charger com-
mands that use either Write-Word or Read-Word proto-
cols, as summarized in Table 4 . ManufacturerID() and
DeviceID() can be used to identify the MAX8731A. On
the MAX8731A, the ManufacturerID() command always
returns 0x004D and the DeviceID() command always
returns 0x0008.
DC-DC Converter
The MAX8731A employs a synchronous step-down DC-
DC converter with an n-channel high-side MOSFET
switch and an n-channel low-side synchronous rectifier.
The MAX8731A features a pseudo-fixed-frequency, cur-
rent-mode control scheme with cycle-by-cycle current
limit. The controller’s constant off-time (t OFF ) is calculat-
ed based on V CSSP , V CSIN , and a time constant with a
minimum value of 300ns. The MAX8731A can also oper-
ate in discontinuous-conduction mode for improved
light-load efficiency. The operation of the DC-DC con-
troller is determined by the following four comparators
as shown in the functional diagrams in Figures 2 and 6 :
The IMIN comparator triggers a pulse in discontinuous
mode when the accumulated error is too high. IMIN
compares the control signal (LVC) against 100mV (typ).
When LVC is less than 100mV, DHI and DLO are both
forced low. Indirectly, IMIN sets the peak inductor cur-
rent in discontinuous mode.
The CCMP comparator is used for current-mode regu-
lation in continuous-conduction mode. CCMP com-
pares LVC against the inductor current. The high-side
MOSFET on-time is terminated when the CSI voltage is
higher than LVC.
The IMAX comparator provides a secondary cycle-by-
cycle current limit. IMAX compares CSI to 2V (corre-
sponding to 10A when RS2 = 10m Ω ). The high-side
MOSFET on-time is terminated when the current-sense
signal exceeds 10A. A new cycle cannot start until the
IMAX comparator’s output goes low.
The ZCMP comparator provides zero-crossing detec-
tion during discontinuous conduction. ZCMP compares
the current-sense feedback signal to 750mA (RS2 =
10m Ω ). When the inductor current is lower than the
750mA threshold, the comparator output is high and
DLO is turned off.
FBS_
ChargeVoltage ( )
+200mV
CSI
2V
OVP
IMAX
The OVP comparator is used to prevent overvoltage at
the output due to battery removal. OVP compares FBS_
against the set voltage (ChargeVoltage()). When FBS_
is 200mV above the set value, the OVP comparator out-
put goes high and the high-side MOSFET on-time is ter-
minated. DHI and DLO remain off until the OVP
LVC
CCMP
R
Q
DH
DRIVER
condition is removed.
CCV, CCI, CCS, and LVC Control Blocks
The MAX8731A controls input current (CCS control
100mV
IMIN
S
Q
DL
DRIVER
loop), charge current (CCI control loop), or charge volt-
age (CCV control loop), depending on the operating
condition. The three control loops —CCV, CCI, and
CCS—are brought together internally at the lowest volt-
ZCMP
age-clamp (LVC) amplifier. The output of the LVC
150mV
DCIN
CSIN
OFF-TIME
COMPUTE
OFF-TIME
ONE-SHOT
amplifier is the feedback control signal for the DC-DC
controller. The minimum voltage at the CCV, CCI, or
CCS appears at the output of the LVC amplifier and
Figure 6 . DC-DC Converter Functional Diagram
clamps the other control loops to within 0.3V above the
22
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相关代理商/技术参数 |
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|---|---|
| MAX8731AEVKIT+ | 功能描述:电源管理IC开发工具 MAX8731A Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8731AEVSYS | 功能描述:电池管理 Evaluation System for the MAX8731A (includes an EVKit and the Maxim SMBUSMON2 board) RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8731ETI+ | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Rail/Tube |
| MAX8731ETI+T | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Tape and Reel |
| MAX8731EVKIT | 功能描述:电池管理 SMBus Level 2 Battery Charger with Remote Sense RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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