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| 型号： | MAX8971EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/39页 |
| 文件大小： | 0K |
| 描述： | IC DCDC CHRGR LI+ 1CELL 20WLP |
| 标准包装： | 2,500 |
| 功能： | 充电管理，过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4 V ~ 7.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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MAX8971
Industry's Smallest 1.55A
1-Cell Li+ DC-DC Charger
V ICHG Charging Current Monitor
V ICHG is a buffered output that can be interpreted to the
charge current (V ICHG = 1400mV/I FCHG). See the Typical
Operating Characteristics section for the V ICHG curve.
SAFEOUT
SAFEOUT is a linear regulator that provides an output
voltage of 5V and can be used to supply low-voltage rated
USB systems. The SFO linear regulator turns on when
V IN > 2.5V.
JEITA Description
The IC JEITA-compliant switching Li+ battery charger
4.2V
4.1V
4.075V
SAFETY REGION 1
SAFETY REGION 2
T1
Q 25mV
T2
Q 25mV
safely charges a single Li+ cell in accordance with JEITA
specifications. The IC monitors the battery temperature
while charging, and automatically adjusts the fast-charge
current and/or charge termination voltage as the battery
4.0V
0 °C
10 °C
25 °C
45 °C
TEMPERATURE
60 °C
85 °C
temperature varies.
In safety region 1, the IC automatically reduces the
C
T1
T2
fast-charging current for T BAT < +10 N C, and reduces
the charge termination voltage from 4.200V ( Q 25mV)
to 4.075V ( Q 25mV) for T BAT > +45 N C. The fast-charge
current is reduced to 50% of the nominal fast-charge
current with options for 25% and 75%. JEITA never
specifically states one or the other. When battery charge
current is reduced by 50%, the timer is doubled.
In safety region 2, the IC automatically reduces the
0.5C
charge termination voltage from 4.200V ( Q 25mV) to
0 °C
10 °C
25 °C
45 °C
60 °C
85 °C
4.075V ( Q 25mV) for T BAT < +10 N C and for T BAT > +45 N C.
The fast-charge current is not changed in safety region 2.
Maxim Model Gauge M3 Support
Figure 5 illustrates how the IC can easily integrate with
Maxim’s Model gauge M3 MAX17047 chip. The user just
TEMPERATURE
Figure 4. JEITA Safety Region
needs to add a Schottky diode between V BATT and V TT
on the MAX17047.
DC
BATT
Factory-Mode GSM Test Mode Support
The IC supports GSM pulse programming scheme. When
BYP
MAX8971
AVL
MAX17047
DC is inserted with no battery operation, the IC soft-starts
and cycles through dead-battery, prequalification, and
fast charge, settling at constant voltage-mode operation,
and regulating to the termination voltage (4.2V default).
At this time, when B4 of register 0x08 is sent, the part
can now support GSM pulse. See the Typical Operating
Characteristics section.
LX
PGND
V ICHG
SDA
SCL
PVL
SFO
THM
I2CIN
AGND
R TD
R T
(BATTERY)
THRM
AIN
BATT
V T T
V SS
Figure 5. MAX8971 with MAX17047
Maxim Integrated
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8971QEWP+T | 功能描述:电池管理 Switch-Mode 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 |
| MAX8973AEWI+ | 制造商:Maxim Integrated Products 功能描述:HIGH CURRENT, MULTI-PHASE DC/DC STEP-DOWN CONVERTER - Rail/Tube |
| MAX8973AEWI+T | 制造商:Maxim Integrated Products 功能描述:HIGH CURRENT, MULTI-PHASE DC/DC STEP-DOWN CONVERTER - Tape and Reel |
| MAX8982AEWO+T | 制造商:Maxim Integrated Products 功能描述:POWER MANAGEMENT IC FOR ICERA E400/E450 PLATFORM-MINI CARD - Tape and Reel |
| MAX8982EWO+T | 功能描述:PMIC 解决方案 PMIC for ICERA E400/E450 Platform RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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