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| 型号： | MAX8671XETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/44页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/CHARGER 40-TQFN-EP |
| 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（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
To support common 500mA to 1000mA wall adapters
at the DC input, pull PEN1 high. With PEN1 pulled high,
the DC current limit is set by an external resistor from
Table 2. DC Current Limit for Standard
Values of R DISET
DISET to AGND (R DISET ). Choose R DISET based on the
current capability of the AC-to-DC adapter (I ADPTR ) as
follows:
R DISET (k Ω )
3.01
3.09
I DCLIM (mA)
997
971
R DISET (k Ω )
4.32
4.42
I DCLIM (mA)
694
679
R DISET ≥ 2000 ×
1 . 5 V
I ADPTR
3.16
3.24
949
926
4.53
4.64
662
647
For the selected value of R DISET , calculate the DC cur-
rent limit (I DCLIM ) as follows (Table 2, Figure 4):
3.32
3.40
3.48
904
882
862
4.75
4.87
4.99
632
616
601
I DCLIM = 2000 ×
1 . 5 V
R DISET
3.57
3.65
840
822
5.11
5.23
587
574
To support USB power sources at the DC input, pull
PEN1 low. With PEN1 low, drive PEN2 and USUS to
select between three internally set USB-related current
limits as shown in Table 1. Choose 100mA for low-
power USB mode. Choose 500mA for high-power USB
mode. Choose suspend to reduce the DC current to
0.11mA (typ) for both USB suspend mode and uncon-
3.74
3.83
3.92
4.02
4.12
4.22
802
783
765
746
728
711
5.36
5.49
5.62
5.76
5.90
6.04
560
546
534
521
508
497
figured OTG mode. To comply with the USB 2.0 specifi-
cation, each device must be initially configured for low
power. After USB enumeration, the device can switch
from low power to high power if given permission from
the USB host. When the load exceeds the current limit,
SYS drops below BAT by V BSREG and the battery sup-
plies supplemental load current.
If the DC power input is not required, connect DC to
ground or leave it unconnected.
The MAX8671X reduces the USB and DC current limits
by 5%/°C when the die temperature exceeds +100°C.
The system load (I SYS ) has priority over the charger cur-
rent, so input current is first reduced by lowering charge
current. If the junction temperature still reaches +120°C
1000
900
800
700
600
DC INPUT CURRENT LIMIT vs.
DC INPUT CURRENT-LIMIT RESISTOR
PEN1 = HIGH
in spite of charge-current reduction, no input current is
drawn from USB and DC; the battery supplies the entire
500
3.0
3.5
4.0
4.5
5.0
5.5
6.0
load and SYS is regulated below BAT by V BSREG . Note
that this on-chip thermal-limiting circuit is not related to
and operates independently from the thermistor input.
DC Power-OK Output ( DOK )
As shown in Figure 5, the DC power-OK output ( DOK )
is an open-drain, active-low output. The DOK output
pulls low when the voltage from DC to AGND (V DC ) is
between V DCH (typically 6.9V) and V DCL (typically
4.0V).
R DISET (k Ω )
Figure 4. Programming DC Current Limit
The DC power-OK circuitry remains active in thermal
overload and DC suspend. If the DC power-OK output
feature is not required, connect DOK to ground or leave
disconnected.
______________________________________________________________________________________
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|---|---|
| MAX8672ETD+T | 功能描述:电池管理 Backup Management IC for NiMH Batteries 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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