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參數(shù)資料
| 型號： | MAX1925 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Fixed-Point Digital Signal Processor 548-FCBGA |
| 中文描述： | 開關(guān)模式單節(jié)Li+電池充電器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 443K |
| 代理商： | MAX1925 |
M
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
Switch-Mode 1-Cell Li+ Chargers
10
______________________________________________________________________________________
RESET
(ACON IS LOW)
OFF
(ACON HIGH Z)
SHDN
(ACON HIGH Z)
ANY STATE
(INCLUDING FAULT)
EN HIGH AND
IN WITHIN ACON
WINDOW*
EN LOW OR
IN OUTSIDE ACON
WINDOW*
TEMP
IN RANGE
V
> 2V
(DEBOUNCED)
V
> 3V
(DEBOUNCED)
FULL TOPOFF
(CHG LED OFF)
DONE
(CHG LED OFF)
KELVIN
(CHG LED OFF)
F_PQ1
F_VB
t
TIMES OUT
BEFORE V
BATT
> 2V
F_PQ2
F_FULL
t
TIMES OUT
BEFORE V
BATT
> 3V
t
TIMES OUT
BEFORE ENTERING
FULL TOP-OFF
STATE
10-SECOND
TIMER
FULL-CHARGE
TIMER TIMES OUT
V
BATT
< 4.2V
*SEE TABLE 2 FOR ACON WINDOW
FOR MAX1925/MAX1926
V
> 4.35V
AND IN WITHIN ACON
WINDOW*
AND EN HIGH
V
IN
WITHIN ACON
WINDOW*
V
IN
< V
BATT
V
IN
> V
BATT
V
IN
< V
BATT
V
IN
> V
BATT
AND V
IN
OUTSIDE ACON WINDOW*
AUTOMATIC RESTART
BATT DROPS TO 4V
V
BATT
> 4.2V
F-TEMP
TEMP OUT
OF RANGE
V
IN
OUTSIDE ACON WINDOW*
PREQUAL1
(I
CHG
= 4mA)
(CHG LED ON)
PREQUAL2
(I
CHG
= C/10)
(CHG LED ON)
FASTCHG
(I
CHG
= C)
(CHG LED ON)
I
< C/8
(DEBOUNCED)
FAULT
(CHG LED BLINK AT 0.5Hz)
(EXT HIGH FET OFF)
Figure 2. MAX1925/MAX1926 State Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1926 | Switch-Mode 1-Cell Li+ Chargers |
| MAX1926ETC | Switch-Mode 1-Cell Li+ Chargers |
| MAX1925ETC | Switch-Mode 1-Cell Li+ Chargers |
| MAX192AMJP | Low-Power, 8-Channel, Serial 10-Bit ADC |
| MAX192AEAP | Low-Power, 8-Channel, Serial 10-Bit ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1925ETC | 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1925ETC+ | 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1925ETC+T | 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1925ETC-T | 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1926ETC | 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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