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| 型号： | MAX8934AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/32页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Smart Power Selector™ |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 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（4x4） |
| 包装： | 带卷 (TR) |
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MAX8934A–MAX8934E
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX9834D), so input voltages greater than 5.3V (4.35V
for the MAX8934B/MAX8934C/MAX8934E) can increase
power dissipation in the limiter. The MAX8934_ input
limiter power loss is (V DC – V SYS ) x I DC , where V SYS may
be as high as 5.3V for the MAX8934A or 4.35V for the
MAX8934B–MAX8934E. The input limiter power loss is
not less than 0.2 I x I DC2 . Also note that the MAX8934_
turns off when any input exceeds 6.9V (typ).
DC and USB Connections and
Current-Limit Options
Input Current Limit
The input and charger current limits are set as shown in
Tables 2a and 2b. It is often preferable to change the
input current limit as the input power source is changed.
The MAX8934_ facilitates this by allowing different input
current limits for DC and USB as shown in Tables 2a
and 2b.
When the input current limit is reached, the first action
taken by the MAX8934_ is to reduce the battery charge
current. This allows the regulator to stay in dropout, or
at 5.3V (MAX8934A), during heavy loads, thus reducing
power dissipation. If, after the charge current is reduced
to 0mA, the load at SYS still exceeds the input current
limit, SYS voltage begins to fall. When the SYS voltage
drops to BATT, the SYS-to-BATT switch turns on, using
battery power to support the system load during the load
peak. The MAX8934_ features flexible input connections
(at the DC and USB input pins) and current-limit settings
(set by PEN1, PEN2, PSET, and ISET) to accommodate
nearly any input power configuration. However, it is
expected that most systems use one of two external
power schemes: separate connections for USB and an
AC adapter, or a single connector that accepts either
USB or AC adapter output. Input and charger current
limit are controlled by PEN1, PEN2, R PSET , and R ISET ,
as shown in Tables 2a and 2b.
Separate Adapter and USB Connectors
When the AC adapter and USB have separate connec-
tors, the adapter output connects to DC and the USB
source connects to USB. PEN1 is permanently connected
high (to DC or V L ). The DC current limit is set by R PSET ,
while the USB current limit is set by PEN2 and USUS.
Single Common Connector
for USB or Adapter
When a single common connector is used for both AC
adapter and USB sources, the DC input is used for
both input sources. The unused USB inputs should be
grounded when an AC adapter is connected at DC,
PEN1 should be pulled high to select the current limit
set by R PSET . When a USB source is connected, PEN1
should be low to select 500mA, 100mA, or USB suspend
(further selected by PEN2 and USUS). PEN1 can be
pulled up by the AC adapter power to implement hard-
ware adapter/USB selection.
USB Suspend
Driving USUS high when PEN1 is low turns off charging,
as well as the SYS output and reduces input current to
190 F A to accommodate USB suspend mode.
Power Monitor Outputs ( UOK , DOK )
DOK is an open-drain output that pulls low when the DC
input has valid power. UOK is an open-drain output that
pulls low when the USB input has valid power. A valid
input for DC or USB is between 4.1V and 6.6V. If a single
power-OK output is preferred, DOK and UOK can be
Table 2a. Input Limiter Control Logic (MAX8934A/MAX8934B/MAX8934C/MAX8934E)
POWER
SOURCE
AC adapter at
DC input
USB power at
DC input
USB power at
USB input; DC
unconnected
DC and USB
unconnected
DOK
L
L
L
L
H
H
H
H
UOK
X
X
X
X
L
L
L
H
PEN1
H
L
L
L
X
X
X
X
PEN2
X
H
L
X
H
L
X
X
USUS
X
L
L
H
L
L
H
X
DC INPUT
CURRENT LIMIT
3000V/R PSET
475mA
95mA
USB suspend
No DC input
USB INPUT
CURRENT LIMIT
USB input off;
DC input has
priority
475mA
95mA
USB suspend
No USB input
MAXIMUM CHARGE
CURRENT*
3000V/R ISET
475mA
95mA
0
3000V/R ISET
0
0
* Charge current cannot exceed the input current limit. Charge may be less than the maximum charge current if the total SYS load
exceeds the input current limit.
Maxim Integrated
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8934BETI+ | 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 |
| MAX8934BETI+ | 制造商:Maxim Integrated Products 功能描述:IC BATTERY CHARGER DUAL 28TQFN |
| MAX8934BETI+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 |
| MAX8934CETI+ | 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 |
| MAX8934CETI+ | 制造商:Maxim Integrated Products 功能描述:IC BATTERY CHARGER DUAL 28TQFN 制造商:Maxim Integrated Products 功能描述:IC, BATTERY CHARGER, DUAL, 28TQFN |
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