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参数资料
| 型号： | MAX8672ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/17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
Additionally, if V IN is interrupted during standard charge,
and the battery voltage is greater than V BATT(RSTRT) , the
timer pauses until power is reapplied. If the battery volt-
age falls below V BATT(RSTRT) , the timer resets. See the
charger state diagram in Figure 3 for more details on
charger operation.
Trickle charge occurs whenever standard charge is
interrupted by timeout, when V BATT falls to V BATT(TRK) ,
or when THRM senses an out-of-temperature-range
condition. Trickle charge has the same voltage limit as
standard charge and cannot drive the battery above
V BATT(CHG) .
A valid voltage is required on both IN and BST for stan-
dard and trickle charging. Once charging begins, if
V IN becomes invalid, charging stops, but the timer is
paused since the backup circuitry is supplying BST. If
V BST falls below 2.2V, the timer resets.
If the thermistor hot- or cold-temperature threshold is
violated, the charge timer pauses and only trickle
charging is allowed. When THRM recovers, the
MAX8672 goes to RUN instead of reentering the charge
mode. This is done to reevaluate the battery state when
the temperature returns to the normal operating range.
The charge timer is not reset when returning to the
RUN state.
V BST
NOT OK
V BST
OFF
(RESET TIMER)
NOT OK
ANY
STATE
V IN NOT OK
AND V BST OK
V BST OK
V IN NOT OK
AND
V BST OK
ANY STATE EXCEPT
TRICKLE CHARGE AND
NO CHARGE
STAND BY
(TIMER PAUSED)
V IN NOT OK AND
V BATT > V BATT(RSTRT)
RESET
TIMER
V IN OK
RUN
T > COLD
AND
T < HOT
V BST OK
(2-CELL, V CHG > 2.1V)
RESET TIMER
COMPLETE
V BATT > V BATT(DR)
V BATT < V BATT(DR) - 50mV
DEEP-
COLD/HOT
TRICKLE
(TIMER PAUSED)
V BATT < V BATT(RSTRT)
STANDARD
CHARGE
RECOVERY
CHARGE
V BATT < V BATT(DR) - 50mV
T < COLD
OR
T > HOT
V IN NOT OK AND
V BST OK
(1-CELL,
V CHG < 2.1V)
TIMER
COMPLETE
V BATT > V BATT(CHG)
T < COLD
AND
V BATT > V BATT(CHG)
T > HOT
TRICKLE
CHARGE
Figure 3. Charger State Diagram
V BATT < V BATT(TRK)
V BATT > V BATT(CHG)
NO CHARGE
AND
FORCE TIMER
COMPLETE
10
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