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參數(shù)資料
| 型號： | MAX640 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters |
| 中文描述： | 5V/3.3V/3V/可調(diào)、高效率、低IQ、降壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 166K |
| 代理商： | MAX640 |
________________________________________________________________ Maxim Integrated Products
1
_______________General Desc ription
The MAX639/MAX640/MAX653 step-down switching
regulators provide high efficiency over a wide range of
load currents, delivering up to 225mA. A current-limiting
pulse-frequency-modulated (PFM) control scheme gives
the devices the benefits of pulse-width-modulated
(PWM) converters (high efficiency at heavy loads), while
using only 10μA of supply current (vs. 2mA to 10mA for
PWM converters). The result is high efficiency over a
wide range of loads.
The MAX639/MAX640/MAX653 input range is 4V to
11.5V, and the devices provide lower preset output volt-
ages of 5V, 3.3V, and 3V, respectively. Or, the output
can be user-adjusted to any voltage from 1.3V to the
input voltage.
The MAX639/MAX640/MAX653 have an internal 1A power
MOSFET switch, making them ideal for minimum-compo-
nent, low- and medium-power applications. For increased
output drive capability, use the MAX649/MAX651/MAX652
step-down controllers, which drive an external P-channel
FET to deliver up to 5W.
________________________Applic ations
9V Battery to 5V, 3.3V, or 3V Conversion
High-Efficiency Linear Regulator Replacement
Portable Instruments and Handy-Terminals
5V-to-3.3V Converters
____________________________Features
o
High Efficiency for a Wide Range of Load Currents
o
10μA Quiescent Current
o
Output Currents Up to 225mA
o
Preset or Adjustable Output Voltage:
5.0V (MAX639)
3.3V (MAX640)
3.0V (MAX653)
o
Low-Battery Detection Comparator
o
Current-Limiting PFM Control Scheme
______________Ordering Information
Ordering Information continued on last page.
*Contact factory for dice specifications.
M
5V /3.3V /3V /Adjustable, High-Effic ienc y,
Low I
Q
, S tep-Down DC-DC Converters
19-4505; Rev 3; 8/97
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
MAX639
CPA
MAX639CSA
MAX639C/D
MAX639EPA
1
2
3
4
5
8
7
6
MAX639
MAX640
MAX653
DIP/SO
TOP VIEW
VFB
SHDN
V+
LX
VOUT
LBO
LBI
GND
__________________Pin Configuration
GND
MAX639
SHDN
LX
VOUT
LBO
LOW-BATTERY
DETECTOR
OUTPUT
ON/OFF
LBI
LOW-BATTERY
DETECTOR
INPUT
OUTPUT
5V
225mA
INPUT
5.5V TO 11.5V
V+
VFB
__________Typic al Operating Circ uit
MAX639ESA
MAX639MJ A
-40°C to +85°C
-55°C to +125°C
8 SO
8 CERDIP
INFEVALUATION KIT
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX653 | 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters |
| MAX639CPA | 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters |
| MAX640ESA | CABLE ASSEMBLY; SMA MALE TO SMC PLUG; 50 OHM, RG188-DS COAX, DOUBLE SHIELDED; 6" CABLE LENGTH |
| MAX639CSA | 700-mW Mono, Differential Input, Class-AB Audio Amplifier with Active High Shutdown and Depop 8-SOIC -40 to 85 |
| MAX639EPA | 700-mW Mono, Differential Input, Class-AB Audio Amplifier with Active High Shutdown and Depop 8-SOIC -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6400BS22 | 制造商:Maxim Integrated Products 功能描述:UP SUPERVISORY CIRCUIT IN 4-BUMP 2X2 CHIP-SCA - Bulk |
| MAX6400BS22+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.2V 1UA 4UCSP - Rail/Tube |
| MAX6400BS22+T | 功能描述:監(jiān)控電路 uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6400BS22-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6400BS23 | 制造商:Maxim Integrated Products 功能描述:UP SUPERVISORY CIRCUIT IN 4-BUMP 2X - Rail/Tube |
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