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参数资料
| 型号： | MAX8671XETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/44页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/CHARGER 40-TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Step-Down Inductor
Choose the step-down regulator inductance to be
4.7μH. The minimum recommended saturation current
requirement is 600mA. In PWM mode, the peak induc-
tor currents are equal to the load current plus one half
of the inductor ripple current. The MAX8671X works
well with physically small inductors. See Table 6 for
suggested inductors.
The peak-to-peak inductor ripple current during PWM
operation is calculated as follows:
where:
V OUT = output voltage
I OUTTAR = target (desired) output current—cannot
be more than the minimum p-channel current-limit
threshold
R N = n-channel on-resistance
R P = p-channel on-resistance
R L = external inductor’s ESR
V IN = input voltage—MAXIMUM
I P ? P = OUT SYS OUT
V ( V ? V
V SYS × f S × L
)
2) Use the following equation to calculate the maximum
output current (I OUTMAX ):
I L _ PEAK LOAD + P ? P
= I
I LIM ? OUT
I OUTMAX =
1 + ( R N L )
+ R
D = OUT OUTTAR N L
where f S is the 2MHz switching frequency.
The peak inductor current during PWM operation is cal-
culated as follows:
I
2
Step-Down Converter Output Current
The three MAX8671X step-down regulators each pro-
vide at least 425mA of output current when using a rec-
ommended inductor (Table 6). To calculate the
maximum output current for a particular application and
inductor use the following two-step process (as shown
in Figure 10):
1) Use the following equation to calculate the approxi-
mate duty cycle (D):
V + I (R + R )
V IN + I OUTTAR ( R N ? R P )
Table 6. Suggested Inductors
V ( 1 ? D )
2 × f × L
1 ? D
2 × f × L
where:
I LIM = p-channel current-limit threshold—MINIMUM
V OUT = output voltage
D = approximate duty cycle derived from step 1
f = oscillator frequency—MINIMUM
L = external inductor’s inductance—MINIMUM
R N = n-channel on-resistance
R L = external inductor’s ESR
MANUFACTURER
Sumida
Taiyo Yuden
TDK
TOKO
SERIES
CDRH2D11HP
CDH2D09
NR3012
NR3010
VLF3012
VLF3010
DE2812C
DE2810C
INDUCTANCE
(μH)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
ESR ( Ω )
190
218
130
190
160
240
130
180
CURRENT RATING
(mA)
750
700
770
750
740
700
880
640
DIMENSIONS (mm)
3.0 x 3.0 x 1.2 = 10.8mm 3
3.0 x 3.0 x 1.0 = 9.0mm 3
3.0 x 3.0 x 1.2 = 10.8mm 3
3.0 x 3.0 x 1.0 = 9.0mm 3
2.8 x 2.6 x 1.2 = 8.7mm 3
2.8 x 2.6 x 1.0 = 7.3mm 3
3.0 x 2.8 x 1.2 = 10.8mm 3
3.0 x 2.8 x 1.0 = 8.4mm 3
34
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|---|---|
| MAX8672ETD+T | 功能描述:电池管理 Backup Management IC for NiMH Batteries 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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