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LP3910 Datasheet(PDF) 62 Page - Texas Instruments

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Part # LP3910
Description  Power Management IC for Hard-Drive-Based Portable Media Players
PDF  72 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP3910 Datasheet(HTML) 62 Page - Texas Instruments

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SAT
RIPPLE
AVE
IN
OUT
RIPPLE
IN
OUT
AVE
OUTMAX
IN
I
I
I
V
1
V
where
I
V
2L
V
I
I
¦
V
!
§
·
¨
¸
©
¹
!
SAT
OUTMAX
RIPPLE
IN
OUT
OUT
RIPPLE
IN
I
I
I
V
V
V
1
where
I
2L
¦
V
!
§
·
§
·
¨
¸
¨
¸
©
¹ ©
¹
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
www.ti.com
Typical Application (continued)
9.2.1 Design Requirements
For typical PMU applications, use the parameters listed in Table 15.
Table 15. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Minimum input voltage
2.7 V
Maximum input voltage
5.5 V
LDO1 output voltage
2.5 V
LDO2 output voltage
3 V
Buck1 output voltage
1.6 V
Buck2 output voltage
1.8 V
Buck-Boost output voltage
3.3 V
Charge current
100 mA
9.2.2 Detailed Design Procedure
9.2.2.1 Inductors for Buck1, Buck2 and Buck-Boost
There are two main considerations when choosing an inductor; the inductor must not saturate and the inductor
current ripple is small enough to achieve the desired output voltage ripple. Care must be taken when reviewing
the different saturation current ratings that are specified by different manufacturers.
Saturation current ratings are typically specified at 25°C, so ratings at maximum ambient temperature of the
application must be requested from the manufacturer.
There are two methods to choose the inductor saturation current rating:
9.2.2.1.1
Method 1
The saturation current is greater than the sum of the maximum load current and the worst-case average-to-peak
inductor current. This can be written as Equation 4:
(4)
Considered when using the Buck-Boost in boost mode, use Equation 5:
where
•
IRIPPLE: Average-to-peak inductor current
•
IOUTMAX: Maximum load current
•
VIN: Maximum input voltage in application
•
L: Minimum inductor value including worst case tolerances (30% drop can be considered for Method 1)
•
ƒ: Minimum switching frequency
•
VOUT: Output voltage
(5)
62
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