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| 型号： | MAX8725ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/30页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 托盘 |
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Multichemistry Battery Chargers with Automatic
System Power Selector
In discontinuous mode, a new cycle is not started until
the LVC voltage rises above 0.15V. Discontinuous-
mode operation can occur during conditioning charge
of overdischarged battery packs, when the charge cur-
rent has been reduced sufficiently by the CCS control
GM OUT
BATT
loop, or when the charger is in constant voltage mode
with a nearly full battery pack.
R ESR
R L
Compensation
The charge voltage, charge current, and input current-
limit regulation loops are compensated separately and
independently at the CCV, CCI, and CCS pins.
CCV Loop Compensation
CCV
R CV
C CV
R OGMV
GMV
REF
C OUT
The simplified schematic in Figure 5 is sufficient to
describe the operation of the MAX1909/MAX8725 when
the voltage loop (CCV) is in control. The required com-
Figure 5. CCV Loop Diagram
pensation network is a pole-zero pair formed with C CV
and R CV . The pole is necessary to roll off the voltage
loop’s response at low frequency. The zero is necessary
GM OUT =
1
A CSI × RS 2
R OGMV × ( 1 + sC CV × R CV )
( 1 + sC CV OGMV )
LTF = GM OUT × ×
to compensate the pole formed by the output capacitor
and the load. R ESR is the equivalent series resistance
(ESR) of the charger output capacitor (C OUT ). R L is the
equivalent charger output load, where R L = Δ V BATT /
Δ I CHG . The equivalent output impedance of the GMV
amplifier, R OGMV , is greater than 10M Ω . The voltage
loop transconductance (GMV = I CCV / V BATT ) depends
on the MODE input, which determines the number of
where A CSI = 20, and RS2 = 0.015 Ω in the Typical
Operating Circuits (Figures 1 and 2), so GM OUT =
3.33A/V.
The loop transfer function is:
× R
cells. GMV = 0.125mA/mV for 4 cells and GMV =
0.167mA/mV for 3 cells. The DC-DC converter transcon-
ductance is dependent upon the charge current-sense
( 1 + sC OUT × R L )
R L
G MV ( 1 + sC OUT × R ESR )
resistor RS2:
Table 1. Poles and Zeros of the Voltage-Loop Transfer Function
NO.
NAME
CALCULATION
DESCRIPTION
1
CCV pole
f P _ CV =
1
2 π R OGMV × C CV
Lowest frequency pole created by C CV and GMV’s finite output
resistance. Since R OGMV is very large and not well controlled, the
exact value for the pole frequency is also not well controlled
(R OGMV > 10M Ω ).
Voltage-loop compensation zero. If this zero is at the same
2
CCV zero
f Z _ CV =
1
2 π R CV × C CV
frequency or lower than the output pole f P_OUT , then the loop
transfer function approximates a single pole response near the
crossover frequency. Choose C CV to place this zero at least one
decade below crossover to ensure adequate phase margin.
3
Output pole
f P _ OUT =
1
2 π R L × C OUT
Output pole formed with the effective load resistance R L and the
output capacitance C OUT . R L influences the DC gain but does not
affect the stability of the system or the crossover frequency.
4
Output zero
f Z _ OUT =
1
2 π R ESR × C OUT
Output ESR Zero. This zero can keep the loop from crossing unity
gain if f Z_OUT is less than the desired crossover frequency;
therefore, choose a capacitor with an ESR zero greater than the
crossover frequency.
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8725ETI+ | 功能描述:电池管理 Multichemistry Battery Charger 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 |
| MAX8725ETI+T | 功能描述:电池管理 Multichemistry Battery Charger 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 |
| MAX8725ETI-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 |
| MAX8725EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX8725 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 |
| MAX8726EUE | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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