參數(shù)資料
型號(hào)： MAX17004AETJ+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3.3 A DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHHD-2, QFN-32
文件頁(yè)數(shù)： 22/36頁(yè)
文件大?。?/td> 611K
代理商： MAX17004AETJ+
MAX17003A/MAX17004A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
______________________________________________________________________________________
29
Input Capacitor Selection
The input capacitor must meet the ripple current
requirement (IRMS) imposed by the switching currents.
For an out-of-phase regulator, the total RMS current in
the input capacitor is a function of the load currents,
the input currents, the duty cycles, and the amount of
overlap as defined in Figure 8.
The 40/60 optimal interleaved architecture of the
MAX17003A/MAX17004A allows the input voltage to go
as low as 8.3V before the duty cycles begin to overlap.
This offers improved efficiency over a regular 180° out-
of-phase architecture where the duty cycles begin to
overlap below 10V. Figure 8 shows the input-capacitor
RMS current vs. input voltage for an application that
requires 5V/5A and 3.3V/5A. This shows the improve-
ment of the 40/60 optimal interleaving over 50/50 inter-
leaving and in-phase operation.
For most applications, nontantalum chemistries (ceram-
ic, aluminum, or OSCON) are preferred due to their
resistance to power-up surge currents typical of sys-
tems with a mechanical switch or connector in series
with the input. Choose a capacitor that has less than
10°C temperature rise at the RMS input current for opti-
mal reliability and lifetime.
Power-MOSFET Selection
Most of the following MOSFET guidelines focus on the
challenge of obtaining high load-current capability
when using high-voltage (> 20V) AC adapters. Low-
current applications usually require less attention.
The high-side MOSFET (NH) must be able to dissipate
the resistive losses plus the switching losses at both
VIN(MIN) and VIN(MAX). Ideally, the losses at VIN(MIN)
should be roughly equal to the losses at VIN(MAX), with
Figure 8. Input RMS Current
I
ID
D
I
ID
RMS
OUT
IN
LX
OL
OUT
IN
LX
=
()
() +
()
5
2
53
2
3
35
3
2
5
1
() ++
()
+
DI
I
D
I
D
OL
OUT
IN
OL
IN
LX
L
LX
OL
LX
OUT
IN
LX
OUT
IN
OL
DUT
D
V
D
V
D
3
5
3
+
()
==
=
Y
CYCLE OVERLAP FRACTION
IN
OUT OUT
OUT
I
VI
V
=
+
55
3II
V
II
VV
V
OUT
IN
RMS
LOAD
OUT
IN
OUT
IN
3
=
()
INPUT RMS CURRENT FOR INTERLEAVED OPERATION:
INPUT RMS CURRENT FOR SINGLE-PHASE OPERATION:
INPUT CAPACITOR RMS CURRENT
vs. INPUT VOLTAGE
VIN (V)
I RMS
(A)
18
16
12
14
10
8
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
620
IN PHASE
50/50 INTERLEAVING
40/60 OPTIMAL
INTERLEAVING
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX17004AETJ+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX17004ETJ+ 功能描述:電壓模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX17004ETJ+T 功能描述:電壓模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX17005AETP+ 功能描述:電池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)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
MAX17005AETP+T 功能描述:電池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)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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