- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄383333 > MAX1736 (Maxim Integrated Products, Inc.) Replaced by TMS320VC5506 : Digital Signal Processor 132-BQFP -40 to 85 PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX1736 |
| 廠(chǎng)商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processor 132-BQFP -40 to 85 |
| 中文描述： | SOT23封裝、單節(jié)Li+電池充電器，配合限流型電源使用 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 179K |
| 代理商： | MAX1736 |
M
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
DESCRIPTION
1
IN
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.
2
GATE
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)
.
3
GND
Ground. Connect the battery
’
s negative terminal to GND.
4
EN
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.
5
CT
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
).
6
BATT
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1736EUT41-T | SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
| MAX1736EUT42-T | SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
| MAX1737 | Replaced by TMS320VC5506 : Digital Signal Processor 132-BQFP |
| MAX1737EVKIT | MAX1737 Evaluation Kit |
| MAX1737EEI | Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1736ETT42+T | 功能描述:電池管理 1Cell Li+ Battery Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
| MAX1736EUT | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Rail/Tube |
| MAX1736EUT+T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
| MAX1736EUT41 | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Cut Tape Product |
| MAX1736EUT41+T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。