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參數(shù)資料
| 型號(hào)： | MAX1537ETX |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC36 |
| 封裝： | 6 X 6 MM, 0.8 MM HEIGHT, MO-220WJJD-1, TQFN-36 |
| 文件頁數(shù)： | 23/38頁 |
| 文件大?。?/td> | 763K |
| 代理商： | MAX1537ETX |
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M
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
______________________________________________________________________________________
23
Output Voltage
DC output accuracy specifications in the
Electrical
Characteristics
table refer to the error-comparator’s
threshold. When the inductor continuously conducts,
the MAX1533/MAX1537 regulate the peak of the output
ripple, so the actual DC output voltage is lower than the
slope-compensated trip level by 50% of the output rip-
ple voltage. For PWM operation (continuous conduc-
tion), the output voltage is accurately defined by the
following equation:
where V
NOM
is the nominal output voltage, A
SLOPE
equals 1%, and V
RIPPLE
is the output ripple voltage
(V
RIPPLE
= ESR x
I
INDUCTOR
as described in the
Output Capacitor Selection
section).
In discontinuous conduction (I
OUT
< I
LOAD(SKIP)
), the
MAX1533/MAX1537 regulate the valley of the output
ripple, so the output voltage has a DC regulation level
higher than the error-comparator threshold. For PFM
operation (discontinuous conduction), the output volt-
age is approximately defined by the following equation:
where V
NOM
is the nominal output voltage, f
OSC
is the
maximum switching frequency set by the internal oscil-
lator, f
SW
is the actual switching frequency, and I
IDLE
is
the idle-mode inductor current when pulse skipping.
Adjustable/Fixed Output Voltages
(Dual-Mode Feedback)
Connect FB3 and FB5 to GND to enable the fixed
SMPS output voltages (3.3V and 5V, respectively), set
by a preset, internal resistive voltage-divider connected
between CSL_ and analog ground. Connect a resistive
voltage-divider at FB_ between CSL_ and GND to
adjust the respective output voltage between 1V and
5.5V (Figure 5). Choose R2 (resistance from FB to
GND) to be about 10k
and solve for R1 (resistance
from OUT to FB) using the equation:
where V
FB_
= 1V nominal.
R
R
V
V
OUT
FB
1
2
1
_
_
=
V
V
f
f
I
ESR
OUT PFM
(
NOM
SW
OSC
IDLE
)
×
=
+
1
2
V
V
A
V
V
OUT PWM
(
NOM
SLOPE NOM
IN
RIPPLE
2
)
=
1
-
-
t
ON(SKIP)
≥
I
IDLE
L
V
IN
- V
OUT
I
I
LOAD(SKIP)
TIME
ON-TIME
0
CSL
TO ERROR
AMPLIFIER
REF
(2.0V)
R
12R
FB
FIXED OUTPUT
FB = GND
ADJUSTABLE
OUTPUT
Figure 4. Pulse-Skipping/Discontinuous Crossover Point
Figure 5. Dual-Mode Feedback Decoder
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1537ETX-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1537EVKIT | 制造商:Maxim Integrated Products 功能描述:MAIN POWER SUPPLY CONTROLLER FOR NOTEBOOK - Bulk |
| MAX1538ETI | 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 |
| MAX1538ETI+ | 功能描述:電池管理 Power-Source Select for Dual-Bat System 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 |
| MAX1538ETI+T | 功能描述:電池管理 Power-Source Select for Dual-Bat System 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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