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参数资料
| 型号： | MAX1925ETC+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16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： | 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： | 4.5 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： | 带卷 (TR) |
Switch-Mode 1-Cell Li+ Chargers
Table 2. ACON Behavior vs. V IN
PART
MAX1925
MAX1926
V IN
V IN > V ACON threshold (4.5V nom) and < 6.1V, and
V IN > V BATT
V IN > V ACON threshold and V IN < V BATT
(Note: This state should never occur)
V IN < V ACON threshold
V IN > V ACON threshold (4.25V nom) and V IN > V BATT
V IN > V ACON threshold and V IN < V BATT
(Note: This state should never occur)
V IN < V ACON Threshold
ACON
LOW
High Z
High Z
LOW
High Z
High Z
CHARGING
YES
NO
NO
YES
NO
NO
CHG LED
ON
(until charge complete)
OFF
OFF
ON
(until charge complete)
OFF
OFF
ing when the battery voltage drops, the MAX1925/MAX1926
ensure that the cell does not remain partially charged after
use when charger power is available.
Charging also restarts if input power is cycled or if the
charger is restarted by the EN or THRM input. If a new
battery is inserted, the charger must be restarted. If the
Inductor Selection
Because the MAX1925/MAX1926 is hysteretic, the con-
stant-current mode switching frequency is a function of
the inductance, sense resistance, and current-sense
hysteresis (30mV, from the Electrical Characteristics ).
To minimize charge-current error:
THRM functionality is used, the charger is automatically
restarted upon battery insertion. When THRM is not
used, toggle EN or connect THRM through a resistor to
be grounded with a battery-door latch switch.
L >
( V IN ? 2 × V BATT ) × t Delay
2 × ? I CHG
Applications Information
Timer Capacitor and Fault Modes
The on-chip timer checks charge progress and issues
an alarm signal through a blinking CHG output when one
of the safety timers times out (see Table 1). All timers are
set by one external capacitor at CT. A 100nF value sets
the full-charge timer (t FULLCHG ) to 3 hours, the
where ? I CHG is the acceptable charge-current error
and should usually be less than 1/4th the full charge
current. t IDelay is the current-sense comparator delay
(300ns typical). Calculate L for V IN = V IN,MAX , V BATT =
V BATT,MIN , with positive ? I CHG and V IN = V IN,MIN ,
V BATT = V BATT,MAX , with negative ? I CHG . Use the larg-
er calculated value for L.
The resulting switching frequency in CCM is:
f Switch > ?
t PREQUAL1 timer to (t FULLCHG )/1088 (10s), and the
t PREQUAL2 timer at (t FULLCHG )/17 (10.67 minutes).
If the charger enters full-charge state (after the charging
? I HYST × L + t IDelay V BATT
? V IN ? V BATT
+ 2 × t IDelay +
?
?
V IPK ( V IN ? V BATT ) t IDelay
current has fallen below C/8) before the full-charge timer
expires, no fault occurs, but if the timer expires before full
charge is reached, a fault is indicated (see Table 1).
A fault is also indicated if the battery voltage exceeds
4.35V. When the cell voltage exceeds 4.35V a fault alarm
is set, the CHG output blinks, and the PFET turns off.
To restart the charger after a fault occurs, the fault state
must be cleared by toggling EN, or by cycling input power
at IN (see Figure 1). Temperature faults do not need to be
cleared by EN. The MAX1925/MAX1926 resume charging
after the temperature returns to within the set window.
I HYST × L + t IDelay × ( V IN ? V BATT ) ? ? 1
V BATT
Choose an inductor with an RMS and saturation current
rating according to the following equation:
I SAT / RMS > +
R SET L
where V IPK is the peak current-sense threshold (158mV typ).
Output Capacitor Selection
The ESR of the output capacitor influences the switch-
ing frequency of the charger during voltage regulation
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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+ | 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 |
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