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參數(shù)資料
| 型號(hào)： | MAX1904ETJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| 中文描述： | 0.2 A DUAL SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 0.80 MM, MO-220WHHD-2, TQFN-32 |
| 文件頁數(shù)： | 12/33頁 |
| 文件大?。?/td> | 649K |
| 代理商： | MAX1904ETJ |
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M
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
12
______________________________________________________________________________________
Standard Application Circuit
The basic MAX1901/MAX1904 dual-output 3.3V/5V
buck converter (Figure 1) is easily adapted to meet a
wide range of applications with inputs up to 28V by
substituting components from Table 1. These circuits
represent a good set of tradeoffs between cost, size,
and efficiency, while staying within the worst-case
specification limits for stress-related parameters, such
as capacitor ripple current. Don
’
t change the frequency
of these circuits without first recalculating component
values (particularly inductance value at maximum bat-
tery voltage). Adding a Schottky rectifier across each
synchronous rectifier improves the efficiency of these
circuits by approximately 1%, but this rectifier is other-
wise not needed because the MOSFETs required for
these circuits typically incorporate a high-speed silicon
diode from drain to source. Use a Schottky rectifier
rated at a DC current equal to at least one-third of the
load current.
Detailed Description
The MAX1901/MAX1902/MAX1904 are dual, BiCMOS,
switch-mode power-supply controllers designed pri-
marily for buck-topology regulators in battery-powered
applications where high-efficiency and low-quiescent
supply current are critical. Light-load efficiency is
enhanced by automatic Idle-Mode operation, a vari-
able-frequency pulse-skipping mode that reduces tran-
sition and gate-charge losses. Each step-down,
power-switching circuit consists of two N-channel
MOSFETs, a rectifier, and an LC output filter. The out-
put voltage is the average AC voltage at the switching
node, which is regulated by changing the duty cycle of
the MOSFET switches. The gate-drive signal to the
N-channel high-side MOSFET must exceed the battery
voltage, and is provided by a flying-capacitor boost cir-
cuit that uses a 100nF capacitor connected to BST_.
Table 1. Component Selection for Standard 3.3V/5V Application
LOAD CURRENT
4A/500kHz
7V to 24V
500kHz
COMPONENT
4A/333kHz
6A/500kHz
Input Range
Frequency
7V to 24V
333kHz
7V to 24V
500kHz
Q1, Q3 High-Side
MOSFETs
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
Fairchild FDS6612A or
International Rectifier
IRF7807V
Q2, Q4 Low-Side
MOSFETs with Integrated
Schottky Diodes
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
Fairchild FDS6670S or
International Rectifier
IRF7807DV1
C3 Input Capacitor
3
10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
3
10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
4
10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
C1 Output Capacitor
150μF, 6V POSCAP
Sanyo 6TPC150M
150μF, 6V POSCAP
Sanyo 6TPC150M
2
150μF, 6V POSCAP
Sanyo 6TPC150M
C2 Output Capacitor
2
150μF, 4V POSCAP
Sanyo 4TPC150M
2
150μF, 4V POSCAP
Sanyo 4TPC150M
2
220μF, 4V POSCAP
Sanyo 4TPC220M
R1, R2 Resistors
0.018
Dale WSL2512-R018-F
0.018
Dale WSL2512-R018-F
0.012
Dale WSL2512-R012-F
L1 Inductor
10μH, 4.5A Ferrite
Sumida CDRH124-100
7.0μH, 5.2A Ferrite
Sumida CEI122-H-7R0
4.2μH, 6.9A Ferrite
Sumida CEI122-H-4R2
L2 Inductor
7.0μH, 5.2A Ferrite
Sumida CEI122-H-7R0
5.6μH, 5.2A Ferrite
Sumida CEI122-H-5R6
4.2μH, 6.9A Ferrite
Sumida CEI122-H-4R2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1904ETJ+ | 功能描述:DC/DC 開關(guān)控制器 500kHz Multi-Output Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1904ETJ+T | 功能描述:DC/DC 開關(guān)控制器 500kHz Multi-Output Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1904ETJ-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1906EVKIT | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1906SEEE | 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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