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参数资料
| 型号： | MAX8672ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC MANAGE NIMH BACKUP 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 备份管理 |
| 电池化学： | 镍金属氢化物 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Complete Backup Management
IC for NiMH Batteries
Charger Voltage and
Standard Charge-Current Limits
The MAX8672 charger is a comparator-controlled cur-
rent source with both current and voltage limits pro-
grammed by external resistors.
The maximum battery charge-voltage limit (V BATT(CHG) )
is programmed by connecting a resistor (R CHGV ) from
CHGV to GND (Figure 4). The range for the charging
voltage limit is 1.5V to 3.0V. For NiMH batteries,
or when THRM senses an out-of-temperature-range
condition. Trickle charge has the same voltage limit as
standard charge.
The trickle current is programmed from 100μA to 1mA
by connecting a resistor (R TRKI ) from TRKI to GND
(Figure 4). After selecting the battery trickle charge cur-
rent (I BATT(TRK) ) for the application, R TRKI is deter-
mined by the following equation:
V BATT(CHG) is typically selected for a 1.5V max charge
per cell. After selecting V BATT(CHG) for the intended
application, the required R CHGV is determined by the
R TRKI ( k Ω ) =
100
I BATT ( TRK )( mA )
following equation:
R8
R CHGV =
V BATT ( CHG )
.
52265 × 10 ? 6
(Note that the voltage at CHGV is V BATT(CHG) / 4.)
The other voltage thresholds associated with the charg-
ing cycle (Figure 2) are dependent upon the selection
C1
(C CT )
2.7V TO 5.5V INPUT
C2
(C IN )
CT
IN
MAX8672
THRM
CHGV
TH1
100k Ω
AT +25 ° C
of V BATT(CHG) as follows:
Falling battery threshold to begin trickle charge
(V BATT(TRK) ):
C6
(C DR )
DR
CHGI
TRKI
R6
(R CHGV )
R4
V BATT(TRK) = 0 . 94 × V BATT(CHG)
R1
(R DR )
R2
(R CHGI )
R3
(R TRKI )
FBL
Falling battery threshold to restart standard charge
R5
(V BATT(RSTRT) ):
BATT
LDO
V BATT(RSTRT) = 0 . 816 × V BATT(CHG)
Rising battery threshold to exit deep-recovery charge
(V BATT(DR) ):
BACKUP
BATTERY
L1
C3
(C BATT )
UV
C5
(C LDO )
V BATT(DR) = 0 . 667 × V BATT(CHG)
Standard charging of the battery occurs when the
R9
(R UV )
GND
BST
C4
(C BST )
MAX8672 is first turned on, or when the battery is dis-
charged below the V BATT(RSTRT) threshold. Standard
charge ceases when the V BATT(CHG) limit is reached.
The standard charge current (I BATT(CHG) ) is pro-
grammed from 0.1mA to 20mA by connecting a resistor
(R CHGI ) from CHGI to GND (Figure 4). The valid range
of R CHGI is 5k Ω to 1M Ω . Once the value of standard
charge current (I BATT(CHG) ) has been chosen, the
required R CHGI is determined by the following equation:
LX
Figure 4. External Component Diagram
Deep-Recovery Charge
The MAX8672 includes a circuit to bring up deep dis-
charged NiMH cells. When power is first applied to IN,
if the battery voltage is less than the battery deep-
R CHGI ( k Ω ) =
100
I BATT ( CHG )( mA )
recovery threshold, V BATT(DR) , DR connects an inter-
nally regulated voltage to an external resistor that
sources extra current into the battery. The DR current-
limiting resistor is typically selected for a 0.5C charge
Trickle Charge
Trickle charge occurs whenever standard charge is
interrupted by timeout, when V BATT falls to V BATT(TRK) ,
rate when the cell voltage is 0V. When DR is on, both
the standard charge current and the DR current charge
the battery. When the cell voltage reaches V BATT(DR) ,
DR current is turned off and standard charging begins.
______________________________________________________________________________________
11
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