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参数资料
| 型号： | MAX1736EUT42+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHRGR SGL LI+ SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.7 V ~ 22 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 标准包装 |
| 其它名称： | MAX1736EUT42+TDKR |
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
Pin Description
PIN
1
2
3
4
5
6
NAME
IN
GATE
GND
EN
CT
BATT
DESCRIPTION
Input Voltage from Current-Limited Voltage Source (22V max). Bypass to GND with a 0.1 μ F
capacitor. The charging current is set by the current limit of the external power supply.
Gate Drive for External PMOS Pass Element. The PMOS device should have a V GS threshold
of 2.5V or less (see Selecting External Components) .
Ground. Connect the battery ’ s negative terminal to GND.
Logic-Level Enable Input. Pull low to disable the MAX1736. EN is internally pulled up to V BATT +
100mV through 350k ? , but draws no current from BATT.
Charge Time Control. Sets the minimum on-time, minimum off-time, and the IN detection interval.
Place a 0.33 μ F capacitor between CT and GND for most applications (see Selecting External
Components ).
Cell Voltage Monitor Input, Precharge Current Output, and MAX1736 Power Source. Connect BATT
to the positive terminal of a single Li+ cell. Bypass BATT with a capacitor to GND (1.5 μ F per amp of
charge current).
Detailed Description
The MAX1736 provides a simple, safe, low-cost method
of charging a single-cell Li+ battery with nearly no heat
generation. Combined with a current-limited voltage
source, the MAX1736 provides precharge, fast-charge,
and top-off-charge capabilities. After constant-current
fast charge, top-off safely finishes charging the battery
by pulse-width modulating charge current. The top-off
on-time is kept below the electrochemical time constant
of the cell. The key advantage of this method is that the
charge circuit is small and generates minimal heat
while providing a safe method of charging to ensure
maximum cell life. Figure 1 shows the MAX1736 func-
tional diagram.
Precharge
To protect Li+ cells from damage that may occur if fast
charged from a dead state, the MAX1736 precharges the
Li+ cell with 6mA at the start of a charging cycle when the
cell voltage is below 2.5V. As soon as the cell voltage
reaches 2.5V, the MAX1736 begins fast charging.
Fast Charge
In fast-charge mode, the MAX1736 turns on the exter-
nal P-channel MOSFET. Charging current is set by the
current limit of the external supply; current is not regu-
lated by the MAX1736 . The P-channel MOSFET is
used only as a switch, not as a linear regulator.
Therefore, the circuit ’ s power dissipation is minimized,
permitting rapid charge cycles with almost no heat
generation. The external power supply should have a
specified current limit that matches the desired fast-
charge current for the Li+ cell.
With the P-channel MOSFET on, V IN will be nearly
equal to V BATT . To detect that an input supply is con-
nected, the MAX1736 periodically turns the P-channel
MOSFET off and checks the voltage at IN. During fast
charge, this occurs once every input detection interval
(20s with C CT = 0.33μF). During pulsed top-off, input
detection occurs more frequently and is continuous
when the MOSFET is off (see Selecting External
Components ).
Pulsed Top-Off
When the battery approaches full charge, its instanta-
neous voltage reaches the BATT regulation voltage and
pulsed top-off begins. The MAX1736 uses a hysteretic
algorithm with a minimum on- and off-time. Cell voltage
is sampled with no charging current to minimize errors
due to battery and cell protection resistance.
If the voltage is below the BATT regulation voltage, the
P-channel MOSFET switches on for a minimum on-time.
If, at the end of the minimum on-time, the cell voltage is
still below the BATT regulation voltage, the switch
remains on until the cell voltage reaches the BATT reg-
ulation voltage. At that point, the P-channel MOSFET
then switches off for at least the minimum off-time. The
minimum on-time is set by CT and should be set below
the electrochemical time constant of the cell. A C CT
value of 0.33μF sets a minimum on-time of 165ms,
which is adequate for most Li+ batteries.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1736EUT-T | 功能描述:电池管理 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 |
| MAX1737EEI | 功能描述:电池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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 |
| MAX1737EEI+ | 功能描述:电池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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 |
| MAX1737EEI+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| MAX1737EEI+T | 功能描述:电池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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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