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參數(shù)資料
| 型號： | MAX1612EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Bridge-Battery Backup Controllers for Notebooks |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PTICH, QSOP-16 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 136K |
| 代理商： | MAX1612EEE |
M
where I
PEAK
is the peak current, I
OUT
is the load cur-
rent, V
BBATT
is the bridge-battery voltage, V
D
is the for-
ward drop across D1, V
OUT
is the output voltage, I
IN
is
average current provided by the bridge battery, and
V
RDS(ON)
is the voltage drop across the internal N-
channel power transistor at LX (typically 0.5V). A larger
number of cells reduces the I
PEAK
and, in effect,
reduces the discharge current, thereby extending the
discharge time. The same is true for decreasing the
output voltage or output current. For example, choose
the following values: I
OUT
= 100mA, V
OUT
= 5V, and
V
BBATT
= 2V (two cells). Using the minimum voltage of
1V for each cell, Table 2 summarizes some common
values.
Step 2:
To avoid saturation, choose an inductor (L) with
a peak current rating above the I
PEAK
calculated in
Step 1. Use low series resistance (
≤
200m
), to opti-
mize efficiency. In this example, a 15μH inductor is
used. See Table 4 for a list of component suppliers.
The “edge-of-continuous” DC-DC algorithm causes the
inductor value to fall out of the peak current equation.
Therefore, the exact inductor value chosen is not criti-
cal to the design. However, the switching frequency is
inversely proportional to inductance, so trade-offs of
switching losses versus physical inductor size can be
made by adjusting the inductor value.
where f is the switching frequency, V
OUT
is the output
voltage, V
RDSON
is the voltage across the internal MOS-
FET switch, V
D
is the forward voltage of D1, I
PEAK
is the
peak current, and V
BBATT
is the bridge battery voltage.
The maximum practical switching frequency is 400kHz.
Step 3:
Choose the charging (C
CC
) and discharging
(C
CD
) timing capacitors. These capacitors set the fre-
quency that the counter increments/decrements.
C
CC
(nF) = 4.3
·
expected charge time (in hours)
C
CD
(nF) = 4.3
·
expected discharge time (in hours)
For instance, using a charge time of 16 hours and a dis-
charge time of one hour, C
CC
= 68nF and C
CD
= 4.3nF.
(Consult battery manufacturers’ specifications for stan-
dard charging information, which generally compen-
sates for battery inefficiencies.)
Step 4:
Using the peak current calculated in Step 1,
calculate the series resistor (R
BBON
) as follows:
R
BBON
= (V
BBON
·
42,000) / I
PEAK
where V
BBON
= 2V (internally regulated).
Step 5:
Resistors R1, R2, and R3 set the DC-DC con-
verter’s output voltage and the low-battery comparator
trip value. The sum of R1, R2, and R3 must be less than
2M
, to minimize leakage errors. Choose resistor R1 =
750k
for the example. Calculate R2 and R3 as follows:
R2 = [ V
OUT
(R3) - 2 (R1) - 2 (R3) ] / (2 - V
OUT
)
R3 = (R1 + R2) / [ (V
TRIP
/ 1.8) - 1]
Bridge-Battery Bac kup Controllers
for Notebooks
10
______________________________________________________________________________________
V
OUT
(V)
V
BBATT
(V)
AVERAGE
I
PEAK
(mA)
I
IN
(mA)
MINIMUM
DISCHARGE TIME
(MINUTES)
10
12
13.2
15
18
20
6
5
4
4
300
250
150
125
20
24
6
5
2
2
2
3
3
3
600
500
450
400
333
300
300
250
225
200
167
150
4.5
6
5
4.5
Table 2. Summary of Common Values for
Designing with the MAX1612/MAX1613
Note:
In this table, I
OUT
= 100mA and battery capacity = 50mAh.
Table 3. Component List
INDUCTORS
CAPACITORS
RECTIFIERS
BATTERY
Sumida CD43
or CD54 series
Sprague 595D
series, AVX
TPS series
Motorola
MBR0530,
NIEC
EC10QS03L
Sanyo
N-50AAA
SUPPLIER
PHONE
FAX
AVX
USA: 207-287-5111
USA: 207-283-1941
Motorola
USA: 408-749-0510
800-521-6274
—
NIEC
USA: 805-867-2555
J apan: 81-3-3494-7411
USA: 805-867-2556
J apan: 81-3-3494-7414
Sumida
USA: 708-956-0666
J apan: 81-3-3607-5111
USA: 708-956-0702
J apan: 81-3-3607-5144
Table 4. Component Suppliers
Sanyo
USA: 619-661-6835
J apan: 81-7-2070-6306
USA: 619-661-1055
J apan: 81-7-2070-1174
f
1
L(I
)
(V
V
) (V
V
RDSON
V
V )
V )
(V
PEAK
BBATT
RDSON
OUT
BBATT
OUT
=
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| MAX1612EEE+ | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1612EEE+T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1612EEE-T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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