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參數(shù)資料
| 型號： | MAX1858A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| 中文描述： | 雙路、180°異相工作的buck控制器，具有排序/預(yù)偏置啟動(dòng)和POR |
| 文件頁數(shù)： | 1/22頁 |
| 文件大小： | 553K |
| 代理商： | MAX1858A |
General Description
The MAX1858A/MAX1875A/MAX1876A dual, synchro-
nized, step-down controllers generate two outputs from
input supplies ranging from 4.5V to 23V. Each output is
adjustable from sub-1V to 18V and supports loads of 10A
or higher. Input voltage ripple and total RMS input ripple
current are reduced by synchronized 180° out-of-phase
operation.
The switching frequency is adjustable from 100kHz to
600kHz with an external resistor. Alternatively, the con-
troller can be synchronized to an external clock gener-
ated by another MAX1858A/MAX1875A/MAX1876A or a
system clock. One MAX1858A/MAX1875A/MAX1876A
can be set to generate an in-phase, or 90° out-of-
phase, clock signal for synchronization with additional
controllers. This allows two controllers to operate either
as an interleaved two- or four-phase system with each
output shifted by 90°. The MAX1858A/MAX1875A/
MAX1876A feature soft-start. The MAX1858A also fea-
tures first-on/last-off power sequencing and soft-stop.
The MAX1858A/MAX1875A/MAX1876A eliminate the
need for current-sense resistors by utilizing the low-side
MOSFET’s on-resistance as a current-sense element.
This protects the DC-DC components from damage dur-
ing output-overload conditions or output short-circuit
faults without requiring a current-sense resistor.
Adjustable foldback current limit reduces power dissipa-
tion during short-circuit conditions. The MAX1858A/
MAX1876A include a power-on reset (POR) output to sig-
nal the system when both outputs reach regulation.
The MAX1858A/MAX1875A/MAX1876A ensure that the
output voltage does not swing negative when the input
power is removed or when EN is driven low. The
MAX1875A/MAX1876A also allow prebias startup with-
out discharging the output.
The MAX1858A/MAX1875A/MAX1876A are available in a
24-pin QSOP package. Use the MAX1875 evaluation kit
or the MAX1858 evaluation kit to evaluate the
MAX1858A/MAX1875A/MAX1876A.
Applications
Network Power Supplies
Telecom Power Supplies
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
Broadband Routers
Servers
Desknote Computers
Features
o
4.5V to 23V Input Supply Range
o
0 to 18V Output Voltage Range (Up to 10A)
o
Adjustable Lossless Foldback Current Limit
o
Adjustable 100kHz to 600kHz Switching
Frequency
o
Optional Synchronization
o
Clock Output for Master/Slave Synchronization
o
4 x 90° Out-of-Phase Step-Down Converters
(Using Two Controllers, Figure 7)
o
Prebias Startup (MAX1875A/MAX1876A)
o
Power Sequencing (MAX1858A)
o
RST
Output with 140ms Minimum Delay
(MAX1858A/MAX1876A)
o
Fixed-Frequency Pulse-Width Modulation (PWM)
Operation
M
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
EN
LX2
DH2
BST2
OSC
ILIM2
FB2
COMP2
TOP VIEW
DL2
V
L
PGND
DL1
CKO
GND
REF
V+
16
15
14
13
9
10
11
12
BST1
DH1
LX1
COMP1
FB1
ILIM1
SYNC
QSOP
MAX1858A
MAX1875A
MAX1876A
RST (N.C.)
() ARE FOR THE MAX1875A ONLY
Pin Configuration
Ordering Information
19-2966; Rev 0; 10/03
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
PIN-PACKAGE
24 QSOP
24 QSOP
24 QSOP
MAX1858A
EEG
MAX1875A
EEG
MAX1876A
EEG
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1875A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1876A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1858AEEG | Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX186CMJP | Low-Power, 8-Channel, Serial 12-Bit ADCs |
| MAX186ACAP | Low-Power, 8-Channel, Serial 12-Bit ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1858AEEG | 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 |
| MAX1858AEEG+ | 功能描述:電壓模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858AEEG+T | 功能描述:電壓模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858AEEG-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 |
| MAX1858EEG | 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 |
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