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參數(shù)資料
| 型號(hào)： | MAX713 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | NiCd NiMH Battery Fast-Charge Controllers(Charges 1-16 Series Cells at Rates Up to 4C )(NiCd NiMH 電池快速充電控制器(可沖1-16節(jié)電池單元,效率可達(dá)4C)) |
| 中文描述： | NiCd/NiMH電池快速充電控制器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 761K |
| 代理商： | MAX713 |
M
NiCd/NiMH Battery
Fast-Charge Controllers
10
______________________________________________________________________________________
The 1.5V of overhead is needed to allow for worst-case
voltage drops across the pass transistor (Q1 of
Typical
Operating Circuit
), the diode (D1), and the sense
resistor (R
SENSE
). This minimum input voltage require-
ment is critical, because violating it can inhibit proper
termination of the fast-charge cycle. A safe rule of
thumb is to choose a source that has a minimum input
voltage = 1.5V + (1.9V x the maximum number of cells
to be charged). When the input voltage at DC IN drops
below the 1.5V + (1.9V x number of cells), the part
oscillates between fast charge and trickle charge and
might never completely terminate fast-charge.
The MAX712/MAX713 are inactive without the wall cube
attached, drawing 5μA (max) from the battery. Diode
D1 prevents current conduction into the DRV pin. When
the wall cube is connected, it charges C1 through R1
(see
Typical Operating Circuit
) or the current-limiting
diode (Figure 19). Once C1 charges to 5V, the internal
shunt regulator sinks current to regulate V+ to 5V, and
fast charge commences. The MAX712/MAX713 fast
charge until one of the three fast-charge terminating
conditions is triggered.
If DC IN exceeds 20V, add a cascode connection in
series with the DRV pin as shown in Figure 5 to prevent
exceeding DRV’s absolute maximum ratings.
Furthermore, if Figure 19’s DC IN exceeds 15V, a tran-
sistor level-shifter is needed to provide the proper volt-
age swing to the MOSFET gate. See the MAX713 EV kit
manual for details.
Select the current-limiting component (R1 or D4) to
pass at least 5mA at the minimum DC IN voltage (see
step 6 in the
Getting Started
section). The maximum
current into V+ determines power dissipation in the
MAX712/MAX713.
maximum current into V+ =
(maximum DC IN voltage - 5V) / R1
power dissipation due to shunt regulator =
5V x (maximum current into V+)
Sink current into the DRV pin also causes power dissipa-
tion. Do not allow the total power dissipation to exceed
the specifications shown in the
Absolute Maximum
Ratings
.
Fast Charge
The MAX712/MAX713 enter the fast-charge state under
one of the following conditions:
1) Upon application of power (batteries already
installed), with battery current detection (i.e., GND
voltage is less than BATT- voltage), and TEMP
higher than TLO and less than THI
and
cell voltage
higher than the UVLO voltage.
2) Upon insertion of a battery, with TEMP higher than
TLO and lower than THI
and
cell voltage higher than
the UVLO voltage.
R
SENSE
sets the fast-charge current into the battery. In
fast charge, the voltage difference between the BATT-
and GND pins is regulated to 250mV. DRV current
increases its sink current if this voltage difference falls
below 250mV, and decreases its sink current if the volt-
age difference exceeds 250mV.
fast-charge current (I
FAST
) = 0.25V / R
SENSE
Trickle Charge
Selecting a fast-charge current (I
FAST
) of C/2, C, 2C, or
4C ensures a C/16 trickle-charge current. Other fast-
charge rates can be used, but the trickle-charge
current will not be exactly C/16.
BATT-
X
V+
OPEN
REF
BATT-
1
0
0
0
0
8
512
256
128
64
CURRENT-SENSE AMPLIFIER
PGM3 FAST_CHARGE Av
1.25V
V+
DC IN
GND
DRV
GND
CC
BATT-
R
SENSE
D1
REF
VLIMIT
CELL_VOLTAGE
BATT-
BATT-
IN_REGULATION
C2
Figure 6. Current and Voltage Regulator (linear mode)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX713C/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713CPE | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX713CPE+ | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX713CSE | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX713CSE+ | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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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