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| 型号： | MAX8903DETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/30页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CHARGER LI+ 2A 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 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 ~ 16 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： | 管件 |
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MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
Table 2. Input Limiter Control Logic
POWER SOURCE
DOK
UOK
DCM***
IUSB USUS
DC STEP-DOWN
OUTPUT
CURRENT LIMIT
USB INPUT
CURRENT LIMIT
MAXIMUM
CHARGE
CURRENT**
Lesser of
AC Adapter at DC Input
L
X
H
X
X
6000V/R IDC
1200V/R ISET and
6000V/R IDC
Lesser of
L
X
L
L
L
100mA
USB input off. DC
1200V/R ISET and
USB Power at DC Input
input has priority.
100mA
Lesser of
L
X
L
H
L
500mA
1200V/R ISET and
500mA
L
X
L
X
H
USB suspend
0
Lesser of
H
L
X
L
L
100mA
1200V/R ISET and
USB Power at USB Input,
100mA
DC Unconnected
H
L
X
H
L
No DC input
500mA
Lesser of
1200V/R ISET and
500mA
H
L
X
X
H
USB suspend
0
DC and USB Unconnected
H
H
X
X
X
No USB input
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.
***There is an internal diode from DCM (anode) to DC (cathode) as shown in Figure 1. If the DCM level needs to be set by a μP, use
a MOSFET for isolation as shown in FIgure 3.
X = Don’t care.
voltage, the SYS voltage is connected to the battery.
The USB input then supplies the SYS load and charges
the battery with any extra available current, while not
exceeding the maximum-allowed USB current. Load
transients can be absorbed by the battery while mini-
mizing the voltage disturbance on SYS. When battery
charging is completed, or the charger is disabled, SYS
is regulated to V SYSREG . If both USB and DC inputs are
valid, power is only taken from the DC input.
USB Suspend
Driving USUS high and DCM low turns off charging as
well as the SYS output and reduces input current to
170μA to accommodate USB suspend mode. See
Table 2 for settings.
Charge Enable ( CEN )
When CEN is low, the charger is on. When CEN is high,
the charger turns off. CEN does not affect the SYS out-
put. In many systems, there is no need for the system
controller (typically a microprocessor) to disable the
18
charger, because the MAX8903_ smart power selector
circuitry independently manages charging and
adapter/battery power hand-off. In these situations, CEN
may be connected to ground.
Soft-Start
To prevent input transients that can cause instability in
the USB or AC adapter power source, the rate of change
of the input current and charge current is limited. When
an input source is valid, SYS current is ramped from
zero to the set current-limit value in typically 50μs. This
also means that if DC becomes valid after USB, the
SYS current limit is ramped down to zero before switch-
ing from the USB to DC input. At some point, SYS is no
longer able to support the load and may switch over to
BAT. The switchover to BAT occurs when V SYS < V BAT .
This threshold is a function of the SYS capacitor size
and SYS load. The SYS current limit then ramps from
zero to the set current level and SYS supports the load
again as long as the SYS load current is less than the
set current limit.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8903DETI+ | 功能描述:电池管理 Dual AC/USB Powered 1-Cell Li+ 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 |
| MAX8903DETI+T | 功能描述:电池管理 Dual AC/USB Powered 1-Cell Li+ 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 |
| MAX8903EETI+ | 功能描述:电池管理 Dual AC/USB Powered 1-Cell Li+ 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 |
| MAX8903EETI+T | 功能描述:电池管理 Dual AC/USB Powered 1-Cell Li+ 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 |
| MAX8903FETI+ | 功能描述:电池管理 Dual AC/USB Powered 1-Cell Li+ 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 |
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