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参数资料
| 型号： | MAX1873REEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR CHARGE LI+ 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，锂聚合物，镍镉，镍氢 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
Simple Current-Limited Switch-Mode
Li+ Charger Controller
portions of the system are powered up or put to sleep.
Without the benefit of input-current regulation, the input
CSSN
5.4
REGULATOR
UNDERVOLTAGE
VL
source would have to be able to supply the maximum
system current plus the maximum charger-input cur-
rent. The MAX1873 input-current loop ensures that the
CSSP
SHUTDOWN
FOR ALL
BLOCKS
COMPARATOR
BATT
DCIN
system always gets adequate power by reducing
charging current as needed. By using the input-current
limiter, the size and cost of the AC adapter can be
reduced. See Setting the Input-Current Limit section for
VH
design details.
CCS
CCV
CCI
CONTROL
LOGIC
VOLTAGE
ERROR AMP
DRIVER
EXT
VH
GND
Input current is measured through an external sense
resistor, R CSS , between CSSP and CSSN. The input-
current limit feature may be bypassed by connecting
CSSP to CSSN.
The input-current error amplifier is compensated at
CCS. A 47nF capacitor from CCS to GND provides suit-
able performance for most applications.
ICHG
CSB
PWM Controller
The pulse-width modulation (PWM) controller drives the
external MOSFET at a constant 300kHz to regulate the
/EN
IOUT
CURRENT
ERROR AMP
BATT
charging current and voltage while maintaining low
noise. The controller accepts inputs from the CCI, CCV,
and CCS error amplifiers. The lowest signal of these
three drives the PWM controller. An internal clamp limits
VADJ
A=1
9R
R
R
4.2V
REFERENCE
REF
the noncontrolling signals to within 200mV of the con-
trolling signal to prevent delay when switching between
the battery-voltage control, charging-current control,
and input-current regulation loops.
GND
Figure 2. Functional Block Diagram
Charging-Current Regulator
The charging-current regulator limits the battery charg-
ing current. Current is sensed by the current-sense
resistor (R CSB in Figure 1) connected between BATT
and CSB. The voltage on ICHG/EN can also adjust the
charging current. Full-scale charging current (I CHG =
0.2V / RCSB) is achieved by connecting ICHG/EN to
REF. See Setting the Charging-Current Limit section for
more details.
The charging-current error amplifier is compensated at
CCI (Figure 1). A 47nF capacitor from CCI to GND pro-
vides suitable performance for most applications.
Input-Current Regulator
The input-current regulator limits the source current by
reducing charging current when the input current
reaches the set input-current limit. In a typical portable
design, system load current will normally fluctuate as
Shutdown
The MAX1873 stops charging when ICHG/EN is pulled
low (below 0.5V) and shuts down when the voltage at
DCIN falls below the voltage at BATT. In shutdown, the
internal resistive voltage-divider is disconnected from
BATT to reduce the battery drain. When AC-adapter
power is removed, or when the part is shut down, the
MAX1873 typically draws 1.5μA from the battery.
Source Undervoltage Shutdown (Dropout)
The DCIN voltage is compared to the voltage at BATT.
When the voltage at DCIN drops below BATT + 50mV,
the charger turns off, preventing drain on the battery
when the input source is not present or is below the
battery voltage.
A diode is typically connected between the input
source and the charger input. This diode prevents the
battery from discharging through the body diode of the
high-side MOSFET should the input be shorted to GND.
It also protects the charger, battery, and systems from
reversed polarity adapters and negative input voltages.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1873SEEE | 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 |
| MAX1873SEEE+ | 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 |
| MAX1873SEEE+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 |
| MAX1873SEEE-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 |
| MAX1873TEEE | 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 |
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