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参数资料
| 型号： | MAX745EAP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER LI+ 20-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
Switch-Mode Lithium-Ion
Battery Charger
To set currents below full scale without changing
R1, adjust the voltage at SETI according to the follow-
ing formula:
I CHG = I FS (V SETI / V REF )
A capacitor at CCI sets the current-feedback loop’s
dominant pole. While the current is in regulation, CCV
voltage is clamped to within 80mV of the CCI voltage.
This prevents the battery voltage from overshooting
when the voltage setting is changed. The converse is
true when the voltage is in regulation and the current
setting is changed. Since the linear range of CCI or
CCV is about 2V (1.5V to 3.5V), the 80mV clamp results
in negligible overshoot when the loop switches from
voltage regulation to current regulation, or vice versa.
Monitoring Charge Current
The battery-charging current can be externally moni-
tored by placing a scaling resistor (R IBAT ) between
IBAT and GND. IBAT is the output of a voltage-con-
trolled current source, with output current given by:
R IBAT must be chosen to limit V IBAT to voltages below
2V for the maximum charging current. Connect IBAT to
GND if unused.
PWM Controller
The battery voltage or current is controlled by a
current-mode, PWM DC/DC converter controller. This
controller drives two external N-channel MOSFETs,
which control power from the input source. The con-
troller sets the switched voltages pulse width so that it
supplies the desired voltage or current to the battery.
Total component cost is reduced by using a dual,
N-channel MOSFET.
The heart of the PWM controller is a multi-input com-
parator. This comparator sums three input signals to
determine the switched signal’s pulse width, setting the
battery voltage or current. The three signals are the
current-sense amplifier’s output, the GMV or GMI error
amplifier’s output, and a slope-compensation signal
that ensures that the current-control loop is stable.
I IBAT =
0.9 μ A
mV
× V SENSE
The PWM comparator compares the current-sense
amplifier’s output to the lower output voltage of either
the GMV or GMI amplifiers (the error voltage). This cur-
where V SENSE is the voltage across the current-sense
resistor (in millivolts) given by:
V SENSE = V CS - V BATT = I CHG x R1
The voltage across R IBAT is then given by:
V IBAT = 0 . 9 × 1 0 ? 3 A V × I CHG × R 1 × R IBAT
rent-mode feedback reduces the effect of the inductor
on the output filter LC formed by the output inductor
(L1) and C1 (Figure 1). This makes stabilizing the cir-
cuit much easier, since the output filter changes to a
first-order RC from a complex, second-order RLC.
IBAT
DCIN
BATT
CURRENT
SENSE
5.4V
REG
4.2
REF
REF
A V = 6
CS
ON
GMI
VL
STATUS
SETI
CCI
1/4
BST
DHI
CLAMP
PWM
LOGIC
VL
LX
DLO
PGND
VADJ
GMV
THM/SHDN
CCV
CELL0
CELL
REF
2
CELL1
Figure 2. Functional Diagram
LOGIC
GND
_______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX745EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX745 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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| MAX7461EUK-T | 功能描述:视频 IC RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
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