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| 型号： | MAX8934GETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/29页 |
| 文件大小： | 0K |
| 描述： | IC LI BATT CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | * |
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MAX8934G
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
? β ?
? ? 1 1 ? ?
T + 273 ° C 298 ° C ? ? ?
+25 N C). Any thermistor resistance can be used as long
as the value of R THMSW is equivalent to the thermistor’s
+25 N C resistance. The MAX8934G THM thresholds are
optimized for a thermistor Beta of 3964. The general rela-
tion of thermistor resistance to temperature is defined by
the following equation:
- ?
R T
= R 25 × e ? ?
where:
R T = The resistance in ohms of the thermistor at
temperature T in N C
R 25 = The resistance in ohms of the thermistor at
+25 N C
A = The material constant of the thermistor
T = The temperature of the thermistor in N C
Charging is suspended when the thermistor temperature
is out of range (V THM_T1 < V THM or V THM < V THM_T4 ).
The charge timers are also suspended and hold their
state but no fault is indicated. When the thermistor
comes back into range, charging resumes and the
charge timer continues from where it left off.
The THMEN input controls THMSW and the thermistor
monitor circuitry when the battery charger is disabled,
providing the user with the means to minimize the bat-
tery current drain caused by the thermistor monitor. The
THMEN input is ignored while the battery is charging,
since the thermistor must be monitored at all times.
the fast-charge current, depending on the sensed bat-
tery temperature. If the battery temperature exceeds the
THM hot overtemperature threshold and THMEN is high,
the OT flag pulls low. Typical systems connect OT to a
F P input so that the system can safely shut down.
Always-On LDO
The ultra-low quiescent current LDO is always on and is
preset to an output voltage of 3.3V. The LDO provides up
to 30mA output current. When DC and USB are invalid
and the battery is discharging, the LDO output volt-
age tracks V SYS as it drops below 3.3V. A 1 F F ceramic
capacitor connected from LDO to GND is recommended
for most applications.
Power Dissipation
PCB Layout and Routing
Good design minimizes ground bounce and voltage
gradients in the ground plane. GND should connect to
the power-ground plane at only one point to minimize the
effects of power-ground currents. Battery ground should
connect directly to the power-ground plane. Connect
GND to the exposed pad directly under the IC. Use mul-
tiple tightly spaced vias to the ground plane under the
exposed pad to help cool the IC. Position input capaci-
tors from DC, SYS, BATT, and USB to the power-ground
plane as close as possible to the IC. Keep high current
traces such as those to DC, SYS, and BATT as short and
wide as possible. Refer to the MAX8934A Evaluation Kit
for a suitable PCB layout example.
While charging, the thermistor monitor is used to auto-
matically adjust the charge termination voltage and/or
Table 3. Package Thermal Characteristics
28-PIN 4mm x 4mm THIN QFN
SINGLE-LAYER PCB
MULTILAYER PCB
22
Continuous Power
Dissipation
B JA
B JC
1666.7mW
(derate 20.8mW/ N C above +70 N C)
48 N C/W
3 N C/W
2285.7mW
(derate 28.6mW/ N C above +70 N C)
35 N C/W
3 N C/W
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8934GETI+ | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934GETI+CAK | 功能描述:电池管理 Dual Input Linear Chargers Smart Power Selector 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 |
| MAX8934GETI+T | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8936EVKIT+ | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Boxed Product (Development Kits) |
| MAX8936EWE+T | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Tape and Reel |
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