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參數資料
| 型號： | MAX1947 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
| 中文描述： | 低輸入/輸出電壓、升壓型DC-DC轉換器，帶有/RESET |
| 文件頁數： | 1/10頁 |
| 文件大?。?/td> | 817K |
| 代理商： | MAX1947 |
General Description
The MAX1947 is a compact, high-efficiency, step-up DC-
DC converter that regulates output voltages from 1.8V to
3.3V to power μP/DSP cores, memory, and I/O rails in 1-
and 2-cell alkaline/NiMH/NiCd battery-powered systems.
It features an internal 800mA switch and synchronous
rectifier to achieve up to 94% efficiency and to eliminate
the need for an external Schottky diode.
High-frequency switching (up to 2MHz) results in low
ripple and small external components, while automatic
pulse skipping at light loads reduces supply current to
just 70μA for extended battery life. Maxim’s proprietary
True Shutdown reduces supply current to just 2μA
and fully discharges the output to ground. The convert-
er is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V,
and 3.3V, requiring no feedback or compensation net-
work. A 75ms
RESET
output flag provides for power-on
reset (POR) and undervoltage detection. The MAX1947
is available in a space-saving 8-pin TDFN package.
Applications
MP3 Players, Pagers, and CD Players
PDAs and Organizers
Digital Still Cameras
Cordless Phones
Wireless Mice/Keyboards
Portable Medical Equipment
Other Battery-Powered Systems
Features
Low Input (0.7V) and Output (1.8V) Voltage
Capability
Internal Synchronous Rectifier
High 94% Efficiency
Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
Up to 2MHz Switching Allows Small External
Components and Low Output Ripple
Automatic Pulse Skipping at Light Loads for
Extended Battery Life
Low 70μA (typ) Operating Supply Current
(Measured at OUT)
Low 2μA Logic-Controlled Shutdown
True Shutdown Fully Discharges Output to
Ground
Uses Only Small Ceramic Capacitors
75ms
RESET
Output Flag
M
Low Input/Output Voltage
Step-Up DC-DC Converter with
RESET
________________________________________________________________
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
LX
PGND
SHDN
8
7
BATT
OUT
GND
GND
RESET
TDFN
3mm x 3mm
TOP VIEW
1
2
3
4
6
5
MAX1947
Pin Configuration
Ordering Information
MAX1947
LX
GND
BATT
OUT
PGND
10
μ
F
2.2
μ
F
4.7
μ
H
V
+1.8V, +2.5V,
+3.0V, +3.3V
V
+0.7V TO +V
OUT
RESET
SHDN
Typical Application Circuit
19-3086; Rev 0; 5/04
*
xy represents the output voltage code (e.g., 18 =1.8V).
Standard output voltages include 3.3V (33), 3.0V (30), 2.5V
(25), and 1.8V (18). Contact the factory for other output voltages
in 100mV increments between 1.8V and 3.3V; the minimum
order quantity is 25,000 units.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
-40
°
C to +85
°
C 8 TDFN 3mm x 3mm
PIN-PACKAGE
MAX1947ETAxy*
True Shutdown is a trademark of Maxim Integrated Products, Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1947ETAxy | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
| MAX1947ETA30 | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
| MAX1947ETA33 | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
| MAX1947ETA18 | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
| MAX1947ETA25 | Low Input/Output Voltage Step-Up DC-DC Converter with RESET |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1947ETA18 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1947ETA18+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 8TDFN EP - Rail/Tube |
| MAX1947ETA18+T | 功能描述:直流/直流開關轉換器 Step-Up w/RESET DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1947ETA18-T | 功能描述:直流/直流開關轉換器 Step-Up w/RESET DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1947ETA25 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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