- 您现在的位置：买卖IC网 > PDF目录1849 > MAX8730ETI+T (Maxim Integrated Products)IC CHARGER BATTERY 28-TQFN PDF资料下载
参数资料
| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/29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) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页
Low-Cost Battery Charger
where θ JA is the thermal resistance of the package (in
The ripple current is determined by:
°C/W), T J_MAX is the maximum junction temperature of
the diode, T A_MAX is the maximum ambient tempera-
ture of the system, and V F is the forward voltage of the
Schottky diode.
? I L =
k OFF
L
The Schottky size and cost can be reduced by utilizing
the MAX8730 foldback function. See the Foldback
Current section for more information.
Select the Schottky diode to minimize the battery leakage
current when the charger is shut down.
Inductor Selection
The MAX8730 uses a fixed inductor current ripple
architecture to minimize the inductance. The charge
current, ripple, and operating frequency (off-time)
affects inductor selection. For a good trade-off of
inductor size and efficiency, choose the inductance
The ripple current is only dependent on inductance
value and is independent of input and output voltage.
See the Ripple Current vs. V BATT graph in the Typical
Operating Characteristics .
See Table 4 for suggestions about inductor selection.
Input Capacitor Selection
The input capacitor must meet the ripple current
requirement (I RMS ) imposed by the switching currents.
Ceramic capacitors are preferred due to their resilience
to power-up surge currents:
L =
BATT ( SRC ? V BATT )
I RMS = I CHG ?
?
? = I CHG
?
according to the following equation:
k OFF
0 . 4 x I CHG
? V V
? V SRC
?
? 2
where k OFF is the off-time constant (5.6V x μs typically).
Higher inductance values decrease the RMS current at
the cost of inductor size.
Inductor L1 must have a saturation current rating of at
least the maximum charge current plus 1/2 of the ripple
current ( ? I L ):
I SAT = I CHG + (1/2) ? I L
at 50% duty cycle.
The input capacitors should be sized so that the tem-
perature rise due to ripple current in continuous con-
duction does not exceed about 10°C. The maximum
ripple current occurs at 50% duty factor or V SRC = 2 x
V BATT , which equates to 0.5 x I CHG . If the application
of interest does not achieve the maximum value, size
the input capacitors according to the worst-case condi-
tions. See Table 5 for suggestions about input capaci-
tor selection.
Table 4. Recommended Inductors
APPLICATION (A)
2.5
2.5
3.5
INDUCTOR
CDRH6D38
CDRH8D28
CDRH8D38
SIZE (mm)
8.3 x 8.3 x 3
7x7x4
8.3 x 8.3 x 4
L (μH)
3.3
4.7
3.5
I SAT (A)
3.5
3.4
4.4
R L (m ? )
20
24.7
24
Table 5. Recommended Input Capacitors
APPLICATION (A)
<3
<4
<4
INPUT CAPACITOR
GMK316F47S2G
GMK325F106ZH
TMK325BJ475MN
CAPACITANCE( μF)
4.7
4.7
10
VOLTS (V)
35
35
25
RMS AT 10°C (A)
1.8
2.4
2.5
______________________________________________________________________________________
25
相关PDF资料 |
PDF描述 |
|---|---|
| MAX8731AETI+ | IC SMBUS LVL2 BATT CHRGR 28TQFN |
| MAX8734AEEI+ | IC PWR SUPPLY CONTROLLER 28QSOP |
| MAX8739ETP+T | IC DC/DC CONV W/OPAMP 20TQFN-EP |
| MAX8740ETB+T | IC CONV DC-DC TFT-LCD 10-TDFN |
| MAX8742EAI+ | IC CNTRLR PWR SUP 28-SSOP |
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 |
发布紧急采购，3分钟左右您将得到回复。