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参数资料
| 型号： | MAX846AEEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC SYS BAT CHRG 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： | 多化学 |
| 电源电压： | 3.7 V ~ 20 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) |
Cost-Saving Multichemistry
Battery-Charger System
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
DCIN
VL
CCI
GND
CCV
VSET
ISET
OFFV
PWROK
CELL2
ON
BATT
CS+
CS-
PGND
DRV
FUNCTION
Supply Input from External DC Source. 3.7V ≤ V DCIN ≤ 20V.
3.3V, 20mA, 1% Linear-Regulator Output. VL powers the system μC and other components. Bypass to
GND with a 4.7μF tantalum or ceramic capacitor.
Current-Regulation-Loop Compensation Pin. Connect a compensation capacitor (typically 10nF) from
CCI to VL.
Ground
Voltage-Regulation-Loop Compensation Pin. Connect a compensation capacitor (typically 10nF) from
CCV to VL.
Float-Voltage Reference-Adjust Input. Leave VSET open for a 4.2V default. See the Applications
Information section for adjustment information.
Current-Set Input/Current-Monitor Output. ISET sets the current-regulation point. Connect a resistor
from ISET to GND to monitor the charging current. ISET voltage is regulated at 1.65V by the current-
regulation loop. To adjust the current-regulation point, either modify the resistance from ISET to ground
or connect a fixed resistor and adjust the voltage on the other side of the resistor (Figure 5). The
transconductance of the current-sense amplifier is 1mA/V.
Logic Input that disables the voltage-regulation loop. Set OFFV high for NiCd or NiMH batteries.
Open-Drain, Power-Good Output to μC. PWROK is low when VL is less than 3V. The reset timeout peri-
od can be set externally using an RC circuit (Figure 3).
Digital Input. CELL2 programs the number of Li-Ion cells to be charged. A high level equals two cells; a
low level equals one cell.
Charger ON/OFF Input. When low, the driver section is turned off and I BATT <1μA. The VL regulator is
always active.
Battery Input. Connect BATT to positive battery terminal.
Current-Sense Amplifier High-Side Input. Connect CS+ to the sense resistor’s power-source side. The
sense resistor may be placed on either side of the pass transistor.
Current-Sense Amplifier Low-Side Input. Connect CS- to the sense resistor’s battery side.
Power Ground
External Pass Transistor (P-channel MOSFET or PNP) Base/Gate Drive Output. DRV sinks current only.
_______________Detailed Description
The MAX846A battery-charging controller combines
three functional blocks: a 3.3V precision, low-dropout
linear regulator (LDO), a precision voltage reference,
and a voltage/current regulator (Figure 1).
Linear Regulator
The LDO regulator output voltage (VL) is two times the
internal reference voltage; therefore, the reference and
LDO track. VL delivers up to 20mA to an external load
and is short-circuit protected. The power-good output
(PWROK) provides microcontroller (μC) reset and
charge-current inhibition.
Voltage Reference
The precision internal reference provides a voltage to
accurately set the float voltage for lithium-ion (Li-Ion)
battery charging. The reference output connects in
series with an internal, 2%-accurate, 20k ? resistor. This
allows the float voltage to be adjusted using one exter-
nal 1% resistor (R VSET ) to form a voltage divider
(Figure 4). The float-voltage accuracy is important for
battery life and to ensure full capacity in Li-Ion batter-
ies. Table 1 shows the accuracies attainable using the
MAX846A.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX846AEEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX846AEUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX846EVKIT | 功能描述:电池管理 MAX846 EVAL KIT 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 |
| MAX846EVKIT+ | 功能描述:电池管理 Cost-Saving Multi-Chemistry Batttery-Charger System 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 |
| MAX847EEI | 功能描述:电池管理 1 Cell Step-Up 2-Way Pager System IC 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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