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参数资料
| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/29页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 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 ~ 28 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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Low-Cost Battery Charger
reaches 100% depth of discharge, it is then recharged.
Connect MODE to GND to place the MAX8730 in
relearn mode. In relearn mode, charging stops, PDS
turns off, and PDL turns on.
To utilize relearn mode, there must be two source-con-
nected MOSFETs to prevent the AC adapter from sup-
plying current to the system through the P1 ’s body
diode. Connect SRC to the common source node of
two MOSFETs.
The system must alert the user before performing a
relearn cycle. If the user removes the battery during
relearn mode, the MAX8730 detects battery removal
and reconnects the AC adapter (PDS turns on and PDL
turns off). Battery removal is detected when the battery
falls below 5xRELTH.
LDO Regulator, REF, and SWREF
An integrated linear regulator (LDO) provides a 5.35V
supply derived from SRC, and delivers over 10mA of
load current. LDO biases the 4.2V reference (REF) and
most of the control circuitry. Bypass LDO to GND with a
1μF ceramic capacitor. An additional standalone 1%,
3.3V linear regulator (SWREF) provides 20mA and can
remain on when the adapter is absent. Set REFON low
to disable SWREF. Set REFON high for normal opera-
tion. SWREF must be enabled to allow charging.
Operating Conditions
? Adapter present: The adapter is considered to be
present when:
V SRC > 8V (max)
? The IMIN comparator sets the peak inductor current
in discontinuous mode. IMIN compares the control
signal (LVC) against 100mV (corresponding to
222mA when RS2 = 30m ? ). The comparator termi-
nates the switch on-time when IMIN exceeds the
threshold.
? The CCMP comparator is used for current-mode reg-
ulation in continuous conduction mode. CCMP com-
pares LVC against the charging-current feedback
signal (CSI). The comparator output is high and the
MOSFET on-time is terminated when the CSI voltage
is higher than LVC.
? The IMAX comparator provides a cycle-by-cycle cur-
rent limit. IMAX compares CSI to 2.95V (correspond-
ing to 6.56A when RS2 = 30m ? ). The comparator
output is high and the MOSFET on-time is terminated
when the current-sense signal exceeds 6.56A. A new
cycle cannot start until the IMAX comparator output
goes low.
? The OVP comparator is used to prevent overvoltage
at the output due to battery removal. OVP compares
BATT against the set voltage; see the Setting Charge
Voltage section. When BATT is 20mV x CELLS above
the set value, OVP goes high and the MOSFET on-
time is terminated.
V ASNS > V BATT - 300mV (max)
? Charging: The MAX8730 allows charging when:
V SRC - V CSIN > 100mV (typ)
3 or 4 cells selected (MODE float or high condition)
BATT/CELLS
VCTL SETPOINT + 20mV
OVP
ICTL > 110mV (max)
INPON is high
? Relearn mode: The MAX8730 enables relearn mode
CSI
2.95V
IMAX
when:
V BATT / 5 > V RELTH
MODE is grounded
LVC
CCMP
R
Q
DH
DRIVER
DC-DC Converter
The MAX8730 employs a step-down DC-DC converter
with a p-channel MOSFET switch and an external
Schottky diode. The MAX8730 features a constant-cur-
100mV
IMIN
S
Q
rent-ripple, current-mode control scheme with cycle-by-
OFF-TIME
cycle current limit. For light loads, the MAX8730
operates in discontinuous conduction mode for
improved efficiency. The operation of the DC-DC con-
BATT
OFF-TIME
COMPUTE
ONE-SHOT
troller is determined by the following four comparators
as shown in the functional block diagram in Figure 3:
Figure 3. DC-DC Converter Block Diagram
______________________________________________________________________________________
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8730EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW COST BATTERY CHARGER - Rail/Tube |
| MAX8731AETI+ | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| MAX8731AETI+T | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| 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 |
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