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参数资料
| 型号： | MAX712EPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR NICD/NIMH 16-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 功能： | 充电管理 |
| 电池化学： | 镍镉（NiCd）、镍金属氢化物（NiMH） |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
MAX712/MAX713
NiCd/NiMH Battery
Fast-Charge Controllers
The voltage loop is stabilized by the output filter
capacitor. A large filter capacitor is required only if the
load is going to be supplied by the MAX712/MAX713 in
the absence of a battery. In this case, set C OUT as:
C OUT (in farads) = (50 x I LOAD )/(V OUT x BW VRL )
where BW VRL = loop bandwidth in Hz
(10,000 recommended)
C OUT > 10μF
I LOAD = external load current in amps
V OUT = programmed output voltage
(V LIMIT x number of cells)
Current Loop
Figure 6 shows the current-regulation loop for a linear-
mode circuit. To ensure loop stability, make sure that
the bandwidth of the current regulation loop (BW CRL ) is
lower than the pole frequency of transistor Q1 (f B ). Set
BW CRL by selecting C2.
BW CRL in Hz = gm/C2, C2 in farads,
gm = 0.0018 Siemens
The pole frequency of the PNP pass transistor, Q1, can
be determined by assuming a single-pole current gain
response. Both f T and B o should be specified on the
data sheet for the particular transistor used for Q1.
f B in Hz = f T /B o , f T in Hz, B o = DC current gain
Condition for Stability of Current-Regulation Loop:
BW CRL < f B
The MAX712/MAX713 dissipate power due to the cur-
rent-voltage product at DRV. Do not allow the power
dissipation to exceed the specifications shown in the
Absolute Maximum Ratings. DRV power dissipation can
be reduced by using the cascode connection shown in
Figure 5.
Power dissipation due to DRV sink current =
terminated. Note that each cycle has two t A intervals
and two voltage measurements.
The MAX712 terminates fast charge when a compari-
son shows that the battery voltage is unchanging. The
MAX713 terminates when a conversion shows the bat-
tery voltage has fallen by at least 2.5mV per cell. This is
the only difference between the MAX712 and MAX713.
Temperature Charge Cutoff
Figure 9a shows how the MAX712/MAX713 detect over-
and under-temperature battery conditions using negative
temperature coefficient thermistors. Use the same model
thermistor for T1 and T2 so that both have the same
nominal resistance. The voltage at TEMP is 1V (referred
to BATT-) when the battery is at ambient temperature.
The threshold chosen for THI sets the point at which
fast charging terminates. As soon as the voltage-on
TEMP rises above THI, fast charge ends, and does not
restart after TEMP falls below THI.
The threshold chosen for TLO determines the tem-
perature below which fast charging will be inhibited.
If TLO > TEMP when the MAX712/MAX713 start up, fast
charge will not start until TLO goes below TEMP.
The cold temperature charge inhibition can be disabled
by removing R5, T3, and the 0.022 μ F capacitor; and by
tying TLO to BATT-.
To disable the entire temperature comparator charge-
cutoff mechanism, remove T1, T2, T3, R3, R4, and R5,
and their associated capacitors, and connect THI to V+
and TLO to BATT-. Also, place a 68kQ resistor from
REF to TEMP, and a 22k Ω resistor from BATT- to TEMP.
(current into DRV) x (voltage on DRV)
ZERO
NEGATIVE
VOLTAGE
Voltage-Slope Cutoff
The MAX712/MAX713’s internal analog-to-digital con-
VOLTAGE
VOLTAGE
SLOPE
CUTOFF FOR MAX712
SLOPE
CUTOFF FOR MAX712
OR MAX713
verter has 2.5mV of resolution. It determines if the bat-
RISES
ZERO
tery voltage is rising, falling, or unchanging by
comparing the battery’s voltage at two different times.
After power-up, a time interval of t A ranging from 21sec
to 168sec passes (see Table 3 and Figure 8), then a
0
POSITIVE RESIDUAL
RESIDUAL
NEGATIVE
RESIDUAL
t
battery voltage measurement is taken. It takes 5ms to
perform a measurement. After the first measurement is
t A
5
ms
t A
5
ms
t A
5
ms
t A
5
ms
t A
5
ms
t A
5
ms
complete, another t A interval passes, and then a
second measurement is taken. The two measurements
are compared, and a decision whether to terminate
charge is made. If charge is not terminated, another full
two-measurement cycle is repeated until charge is
12
INTERVAL INTERVAL INTERVAL INTERVAL INTERVAL INTERVAL
NOTE: SLOPE PROPORTIONAL TO VBATT
Figure 8. Voltage Slope Detection
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX712EPE+ | 功能描述:电池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX712ESE | 功能描述:电池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX712ESE+ | 功能描述:电池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX712ESE+T | 功能描述:电池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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 |
| MAX712ESE-T | 功能描述:电池管理 NiCd/NiMH Battery Fast-Charge Ctlr 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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