- 您现在的位置：买卖IC网 > PDF目录17113 > MAX8903YETI+T (Maxim Integrated Products)IC DC/DC CHARGER LI+ 2A 28-TQFN PDF资料下载
参数资料
| 型号： | MAX8903YETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CHARGER LI+ 2A 28-TQFN |
| 产品培训模块： | 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 ~ 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： | 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页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
When the charger is turned on, the charge current ramps
from 0A to the ISET current value in typically 1.0ms.
Charge current also soft-starts when transitioning to fast-
charge from prequal, when the input power source is
switched between USB and DC, and when changing the
USB charge current from 100mA to 500mA with the IUSB
logic input. There is no di/dt limiting, however, if R ISET is
changed suddenly using a switch.
Battery Charger
While a valid input source is present, the battery charg-
er attempts to charge the battery with a fast-charge
current determined by the resistance from ISET to
GND. Calculate the R ISET resistance according to the
following equation:
R ISET = 1200V/I CHGMAX
Monitoring Charge Current
The voltage from ISET to GND is a representation of the
battery charge current and can be used to monitor the
current charging the battery. A voltage of 1.5V repre-
sents the maximum fast-charge current.
If necessary, the charge current is reduced automati-
cally to prevent the SYS voltage from dropping.
Therefore, a battery never charges at a rate beyond the
capabilities of a 100mA or 500mA USB input, or over-
loads an AC adapter. See Figure 5.
When V BAT is below V BATPQ , the charger enters pre-
qual mode and the battery charges at 10% of the maxi-
mum fast-charge rate until the voltage of the deeply
discharged battery recovers. When the battery voltage
MONITORING THE BATTERY
CHARGE CURRENT WITH V ISET
1.5
V ISET (V)
0
reaches V BATREG and the charge current drops to 10%
of the maximum fast-charge current, the charger enters
the DONE state. The charger restarts a fast-charge
cycle if the battery voltage drops by 100mV.
Charge Termination
When the charge current falls to the termination thresh-
old (I TERM ) and the charger is in voltage mode, charg-
ing is complete. Charging continues for a brief 15s
top-off period and then enters the DONE state where
charging stops.
Note that if charge current falls to I TERM as a result of
the input or thermal limiter, the charger does not enter
DONE. For the charger to enter DONE, charge current
must be less than I TERM , the charger must be in volt-
age mode, and the input or thermal limiter must not be
reducing charge current.
Charge Status Outputs
Charge Output ( CHG )
CHG is an open-drain, active-low output that indicates
charger status. CHG is low when the battery charger is
in its prequalification and fast-charge states. CHG goes
high impedance if the thermistor causes the charger to
go into temperature suspend mode.
When used in conjunction with a microprocessor (μP),
connect a pullup resistor between CHG and the logic
I/O voltage to indicate charge status to the μP.
Alternatively, CHG can sink up to 20mA for an LED
charge indicator.
Fault Output ( FLT )
FLT is an open-drain, active-low output that indicates
charger status. FLT is low when the battery charger has
entered a fault state when the charge timer expires.
This can occur when the charger remains in its prequal
state for more than 33 minutes or if the charger remains
in fast-charge state for more than 660 minutes (see
Figure 6). To exit this fault state, toggle CEN or remove
and reconnect the input source.
When used in conjunction with a microprocessor (μP),
connect a pullup resistor between FLT and the logic I/O
voltage to indicate charge status to the μP.
Alternatively, FLT can sink up to 20mA for an LED fault
indicator. If the FLT output is not required, connect FLT
to ground or leave unconnected.
Charge Timer
DISCHARGING
0
BATTERY CHARGING CURRENT (A)
1200V/R ISET
A fault timer prevents the battery from charging indefi-
nitely. The fault prequal and fast-charge timers are con-
trolled by the capacitance at CT (C CT ).
Figure 5. Monitoring the Battery Charge Current with the
Voltage from ISET to GND
Maxim Integrated
19
相关PDF资料 |
PDF描述 |
|---|---|
| VI-J44-EZ | CONVERTER MOD DC/DC 48V 25W |
| VI-J43-EZ | CONVERTER MOD DC/DC 24V 25W |
| GCC08DRYS-S734 | CONN EDGECARD 16POS DIP .100 SLD |
| 60B104C | IND 100UH 7.5A POWER CORE SMD |
| SCRH5D18-4R1 | INDUCTOR SMD 4.1UH 1.95A 10KHZ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8904AETN+ | 功能描述:PMIC 解决方案 Point of Sales PMIC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8904AETN+T | 功能描述:PMIC 解决方案 Point of Sales PMIC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8904ETN+ | 功能描述:PMIC 解决方案 PMIC for 2-cell Li+ handheld RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8904ETN+T | 功能描述:PMIC 解决方案 PMIC for 2-cell Li+ handheld RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8904EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR MAX8904 - Boxed Product (Development Kits) |
发布紧急采购，3分钟左右您将得到回复。