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参数资料
| 型号： | MAX1925ETC+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16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
and a new battery is connected during either fast-charge
or full topoff modes, the charger begins with full charge
current without prequalification unless the part is reset.
Detect battery insertion by connecting THRM to a ther-
mistor on the battery, if a thermistor is used, or to a 10k ?
resistor linked to a battery door mechanism.
Constant-Current Mode (CCM)
When the battery voltage is below 4.2V, the
MAX1925/MAX1926 regulate the charging current by
controlling the peak and valley inductor currents. When
the inductor current exceeds the 158mV/R SET , the
MAX1925/MAX1926 turn the external PFET off. When
the inductor current falls below 128mV/R SET , the
MAX1925/MAX1926 turns the external PFET on, but
only if the battery voltage is below regulation. The maxi-
mum cell charging current is programmed by selecting
the external R SET (see Figure 1) resistor connected
between BATT and CS. Select the external resistor
value using R SET = 142mV/I FASTCHG .
The accuracy of the charge current is a function of
input voltage, battery voltage, inductance, and com-
parator delay (300ns typ). Determine the charge-cur-
rent error according to the following equation:
For this reason choose L for an on-time and off-time greater
than 2 ? t IDelay to minimize error in the charging current.
Constant-Voltage Mode (CVM)
In constant-voltage mode (CVM), the controller regu-
lates the peak and valley of the output ripple. The maxi-
mum cell voltage is regulated to 4.2V. If, for any reason,
the cell voltage exceeds 4.35V, a fault alarm is set, the
CHG output blinks, and the PFET power switch is held
off. The charger can then be restarted only by cycling
input power or the EN input.
Indication of Charge Completion ( CHG )
The CHG output is a 10mA current-sink output that indi-
cates the cell ’ s charging status. Connect an LED from
IN to CHG for a visible indicator. Alternatively, a pullup
resistor (typically 200k ? ) from a logic supply to CHG
provides a logic-level output. Table 1 relates the status
of the LED to the condition of the charger and battery.
ACON Output
The ACON open-drain output indicates when usable
power is applied to IN. In the MAX1926 when V IN
exceeds ACON threshold (nominally 4.25V with IN ris-
ing — see the Electrical Characteristics table), ACON
? I CHG =
( V IN ? 2 × V BATT ) × t IDelay
2 × L
goes low. In the MAX1925, ACON goes low when the
input voltage is between 4.5V and 6.1V (see Table 2).
Re-Initiating a Charging Cycle
where ? I CHG is the charge-current error, and t IDelay is
the current-sense comparator delay.
Table 1. CHG Output States
The MAX1925/MAX1926 feature automatic restart that
resumes charging when the cell voltage drops to 4V and
t FULL_CHG is completed. By automatically resuming charg-
STATE
OFF
PREQUAL1
PREQUAL2
FAST CHARGE
FULL CHARGE
FAULT PREQUAL1
FAULT PREQUAL2
FAULT FULL
FAULT BATT
VOLTAGE
FAULT TEMP
NONE
CONDITION
EN low or no battery or input power
Charge current = 4mA until BATT reaches 2V.
Charge current = C/10 until BATT reaches 3V.
Charge current = C = 142mV/R SET .
Charge current has fallen to C/8.
BATT does not reach 2V before PREQUAL1 timeout.
BATT does not reach 3V before PREQUAL2 timeout.
Charge current does not drop to C/8 before FULL CHARGE
timeout.
Battery voltage has exceeded 4.35V.
Temperature has risen above +50 ° C or fallen below 0 ° C.
Temp fault clears by itself.
Initial power-up or enable with battery not present.
CHG
High impedance (LED off)
Low (LED on)
Low (LED on)
Low (LED on)
High impedance (LED off)
Blinking. LED on 50% f BLINK (0.5Hz). Can
only be cleared by cycling input power,
THRM, or EN.
Blinking. LED on 50% f BLINK (0.5Hz).
MAX1925 — High impedance (LED off)
MAX1926 — Blinking (LED on 50% 0.5Hz)
Blinking at rapid rate as charger cycles
through RESET, PREQUAL1, and DONE.
12
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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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