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| 型号： | MAX8939EWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 42/45页 |
| 文件大小： | 0K |
| 描述： | IC PWR MGMT HANDSETS 30WLP |
| 标准包装： | 2,500 |
| 应用： | 充电泵，无线设备 |
| 输入电压： | 2.9 V ~ 5.5 V |
| 输出数： | 7 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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MAX8939/MAX8939A/MAX8939B
System Power Management
for Mobile Handset
Applications Information
Inductor Selection
The OUT1 step-up converter is designed to use a 2.2 F H
to 10 F H inductor (see Table 22). To prevent core satura-
tion, ensure that the inductor saturation current rating
exceeds the peak inductor current for the application.
Calculate the worst-case peak inductor current with the
following formula:
For small values of L in discontinuous conduction opera-
tion, I PEAK is 860mA (typ). Table 23 provides a list of
recommended inductors.
Capacitor Selection
Ceramic capacitors are recommended due to their low
ESR. Ensure that the capacitor maintains its capaci-
tance over temperature and DC bias. Generally ceramic
capacitors with X5R or X7R temperature characteristics
perform well. Note that some small size ceramic capaci-
I PEAK
=
V OUT × I OUT(MAX)
0.9 × V IN(MIN)
+
V IN(MIN) × 0.5 F s
2 × L
tors fail to maintain their capacitance when a DC bias is
applied and should be avoided. Place the capacitors as
close as possible to the IC.
The OUT2 LED driver is optimized for using a 10 F H
inductor, although larger or smaller inductors may be
used. Using a smaller inductance results in discontinu-
ous current mode operation over a larger range of output
power, whereas use of a larger inductance results in
continuous conduction for most of the operating range.
To prevent core saturation, ensure that the inductor’s
saturation current rating exceeds the peak inductor cur-
rent for the application. For larger inductor values and
continuous conduction operation, calculate the worst-
case peak inductor current with the following formula:
The recommended input and output capacitor values are
shown in Figure 1, however, larger value capacitors can
be used to further reduce ripple at the expense of size
and higher cost.
Compensation
The OUT1 step-up converter is compensated for sta-
bility through an external compensation network from
COMP1 to ground. A 2200pF ceramic capacitor is rec-
ommended.
The OUT2 LED driver is compensated for stability
through an external compensation network from COMP2
I PEAK
=
V OUT × I OUT(MAX)
0.9 × V IN(MIN)
+
V IN(MIN) × 0.5 F s
2 × L
to ground. A 0.22 F F ceramic capacitor is recommended
for most applications. Higher C COMP2 values increase
soft-start duration, as well as the time delay between
enabling the step-up converter to initiating soft-start. See
the Soft-Start OUT2 section for more information.
Table 22. Recommended Inductors for L1
MANUFACTURER
Cooper (Coiltronics)
FDK
TDK
TOKO
PART
SD3114
MIPF2520
MIPW3226
VLS3012ET
VLS3010T
DE2812C
DE2812C
INDUCTANCE
(μH)
2.2
2.2
2.2
2.2
10
2.7
10
DCR
(m I )
110
80
100
80
390
75
325
I SAT
(A)
1.74
1.3
1.1
1.35
0.65
1.8
0.78
DIMENSIONS
(L TYP x W TYP x H MAX ) (mm)
3.0 x 3.0 x 1.45
2.5 x 2.0 x 1.0
3.2 x 2.6 x 1.0
3 x 3 x 1.2
3 x 3 x 1.0
3.0 x 3.2 x 1.2
3.0 x 3.2 x 1.2
Table 23. Recommended Inductors for L2
MANUFACTURER
TOKO
FDK
PART
1098AS-100M
1069AS-220M
MIP3226D100M
INDUCTANCE
(μH)
10
22
10
DCR
(m I )
290
570
160
I SAT
(A)
0.75
0.47
0.9
DIMENSIONS
(L TYP x W TYP x H MAX ) (mm)
2.8 x 3.0 x 1.2
3 x 3 x 1.8
3.2 x 2.6 x 1.0
42
Maxim Integrated
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相关代理商/技术参数 |
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|---|---|
| MAX8939QEWV+T | 制造商:Maxim Integrated Products 功能描述:SYSTEM POWER - Tape and Reel |
| MAX893LESA | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+ | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA-T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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