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| 型號： | MAX1902ETJ |
| 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)： | 1/33頁 |
| 文件大小： | 649K |
| 代理商： | MAX1902ETJ |
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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.
General Description
The MAX1901/MAX1902/MAX1904 are buck-topology,
step-down, switch-mode, power-supply controllers that
generate logic-supply voltages in battery-powered sys-
tems. These high-performance, dual/triple-output devices
include on-board power-up sequencing, power-good sig-
naling with delay, digital soft-start, secondary winding
control, low dropout circuitry, internal frequency-compen-
sation networks, and automatic bootstrapping.
Up to 97% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system
suspend or standby mode. Excellent dynamic response
corrects output load transients within five clock cycles.
Strong 1A on-board gate drivers ensure fast external N-
channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the
SKIP
pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX1901/MAX1902/MAX1904 include two PWM reg-
ulators, adjustable from 2.5V to 5.5V with fixed 5.0V and
3.3V modes. All these devices include secondary feed-
back regulation, and the MAX1902 contains a 12V/120mA
linear regulator. The MAX1901/MAX1904 include a sec-
ondary feedback input (SECFB), plus a control pin
(STEER) that selects which PWM (3.3V or 5V) receives the
secondary feedback signal. SECFB provides a method
for adjusting the secondary winding voltage regulation
point with an external resistor divider, and is intended to
aid in creating auxiliary voltages other than fixed 12V.
The MAX1901/MAX1902 contain internal output overvolt-
age and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
Features
o
97% Efficiency
o
4.2V to 30V Input Range
o
2.5V to 5.5V Dual Adjustable Outputs
o
Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode)
o
12V Linear Regulator
o
Adjustable Secondary Feedback
(MAX1901/MAX1904)
o
5V/50mA Linear Regulator Output
o
Precision 2.5V Reference Output
o
Programmable Power-Up Sequencing
o
Power-Good (
RESET
) Output
o
Output Overvoltage Protection
(MAX1901/MAX1902)
o
Output Undervoltage Shutdown
(MAX1901/MAX1902)
o
333kHz/500kHz Low-Noise, Fixed-Frequency
Operation
o
Low-Dropout, 98% Duty-Factor Operation
o
2.5mW Typical Quiescent Power (12V input, both
SMPSs on)
o
4μA Typical Shutdown Current
M
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________________________________________________________
Maxim Integrated Products
1
5V
LINEAR
12V
LINEAR
POWER-UP
SEQUENCE
POWER-
GOOD
3.3V
SMPS
5V
SMPS
RESET
ON/OFF
5V (RTC)
3.3V
INPUT
5V
12V
Functional Diagram
19-2224; Rev 3; 12/03
Ordering Information
Idle Mode is a trademark of Maxim Integrated Products, Inc.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
PART
TEMP RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
PIN-PACKAGE
28 SSOP
32 Thin QFN 5m m x 5m m
28 SSOP
32 Thin QFN 5m m x 5m m
28 SSOP
32 Thin QFN 5m m x 5m m
MAX1901
EAI
MAX1901ETJ
MAX1902
EAI
MAX1902ETJ
MAX1904
EAI
MAX1904ETJ
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1904BEAI | 制造商:Maxim Integrated Products 功能描述: |
| MAX1904BEAI+ | 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 |
| MAX1904BEAI+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 |
| MAX1904EAI | 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 |
| MAX1904EAI+ | 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 |
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