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參數(shù)資料
| 型號： | MAX713CPE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | NiCd/NiMH Battery Fast-Charge Controllers |
| 中文描述： | 0.1 A BATTERY CHARGE CONTROLLER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 168K |
| 代理商： | MAX713CPE |
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 5
μ
A (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
T ric kle 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)
相關(guān)PDF資料 |
PDF描述 |
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| MAX713CSE | NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713EPE | NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713ESE | NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713MJE | NiCd/NiMH Battery Fast-Charge Controllers |
| MAX712 | NiCd/NiMH Battery Fast-Charge Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX713CSE+T | 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-T | 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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