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参数资料
| 型号： | MAX1926ETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ 12-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 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： | 4.5 V ~ 12 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
| 包装： | 管件 |
Switch-Mode 1-Cell Li+ Chargers
Detailed Description
The MAX1925/MAX1926 switch-mode battery chargers
form a complete solution for a single-cell Li+ battery. The
devices include battery undervoltage/overvoltage fault
protection. The MAX1925/MAX1926 use EN and THRM
for shutdown, battery detection, and temperature monitor-
ing. The devices provide outputs to indicate charge sta-
tus ( CHG ) and presence of input power ( ACON ).
The MAX1925/MAX1926 include two prequalification
modes that must be passed before the charger enters
the fast-charge state. During fast charge, the charger
operates initially in constant-current mode until the bat-
tery voltage reaches 4.2V. When the battery voltage
has reached 4.2V, the charger operates in constant-
voltage mode. In constant-current mode, the charger
acts as a hysteretic current source, controlling the
inductor ’ s peak and valley currents. In constant-voltage
mode, the charger regulates the peak and valley of the
output ripple.
Charge Cycle
The MAX1925/MAX1926 initiate PREQUAL when one of
the following occurs:
? When an external power source is connected
? The cell voltage falls to 4V after charging is finished
? EB is toggled
? Input power is cycled
Some Li+ cells can be damaged when fast-charged
from a completely dead state. Moreover, an over-dis-
charged cell may indicate a dangerous abnormal cell
condition. As a built-in safety feature, the MAX1925/
MAX1926 use a two-level prequalification charge to
determine if it is safe to charge. When the cell voltage is
less than 2V, the cell is charged from an internal
V IN OUTSIDE ACON WINDOW*
RESET
ANY STATE
V IN > V BATT AND V IN
OUTSIDE ACON WINDOW*
V IN WITHIN ACON
WINDOW*
(ACON IS LOW)
EN LOW OR
IN OUTSIDE ACON
(INCLUDING FAULT)
V IN > V BATT
OFF
(ACON HIGH Z)
V IN < V BATT
EN HIGH AND
IN WITHIN ACON
WINDOW*
PREQUAL1
WINDOW*
TEMP
IN RANGE
F-TEMP
V BATT > 4.35V
TEMP OUT AND IN WITHIN ACON
OF RANGE WINDOW*
AND EN HIGH
(I CHG = 4mA)
SHDN
(ACON HIGH Z)
(CHG LED ON)
V BATT > 2V
(DEBOUNCED)
t PREQUAL1 TIMES OUT
BEFORE V BATT > 2V
F_PQ1
F_VB
FAULT
V IN < V BATT
AUTOMATIC RESTART
BATT DROPS TO 4V
PREQUAL2
(I CHG = C/10)
(CHG LED ON)
V BATT > 3V
(DEBOUNCED)
t PREQUAL2 TIMES OUT
BEFORE V BATT > 3V
F_PQ2
(CHG LED BLINK AT 0.5Hz)
(EXT HIGH FET OFF)
FASTCHG
(I CHG = C)
(CHG LED ON)
I CHG < C/8
(DEBOUNCED)
FULL TOPOFF
(CHG LED OFF)
t FULLCHG TIMES OUT
BEFORE ENTERING
FULL TOP-OFF
STATE
10-SECOND
TIMER
F_FULL
V BATT < 4.2V
KELVIN
(CHG LED OFF)
V BATT > 4.2V
*SEE TABLE 2 FOR ACON WINDOW
FOR MAX1925/MAX1926
DONE
(CHG LED OFF)
FULL-CHARGE
TIMER TIMES OUT
Figure 2. MAX1925/MAX1926 State Diagram
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1926ETC+ | 功能描述:电池管理 Switch-Mode 1-Cell 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 |
| MAX1926ETC+T | 功能描述:电池管理 Switch-Mode 1-Cell 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 |
| MAX1926ETC-T | 功能描述:电池管理 Switch-Mode 1-Cell 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 |
| MAX1926EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1925 MAX1926 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 |
| MAX1927REUB | 功能描述:直流/直流开关转换器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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