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PDF ME2139 Data sheet ( Hoja de datos )
| Número de pieza | ME2139 | |
| Descripción | ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL | |
| Fabricantes | Microne | |
| Logotipo |  |
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ME2139
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
Description
The ME2139 series is a CMOS step-up
switching regulator which mainly consists of a
reference voltage source, an oscillation circuit,
an error amplifier, a phase compensation circuit,
a PWM/PFM switching control circuit. With an
external low-ON-resistance Nch Power MOS,
this product is applicable to applications
requiring high efficiency and high output current.
The ME2139 series switches its operation to the
PFM control circuit whose duty ratio is 15 % with
to the PWM/PFM switching control circuit under
a light load and to prevent decline in the
efficiency by IC operation current.
Selection Guide
Feature
Low voltage operation: Start-up is guaranteed
from 0.9 V(IOUT =1 mA )
Duty ratio: Built-in PWM/PFM switching control
circuit 15 to 78 % .
oscillator frequency：1.0MHz
External parts: coil, diode, capacitor, and
transistor
Output voltage range: 1.5V ~6.5 V
Output voltage accuracy：±2%
Soft start function: 2 mS.
PACKAGE：SOT23-5
Typical Application
MP3 players, digital audio players
Digital cameras, GPS, wireless transceiver
Portable devices
V1.0
Page 1 of 11
1 page  
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
ME2139
Note:
1. VOUT(S) is the set output voltage value, and VOUT is the typical value of the output voltage.
2. VOUT(S) can be set by using the rate of VFB and output voltage setting resistors (R1, R2).
3. VFB(S) is the set output voltage value.
4. VDD/VOUT separate type:
1.8V≦VDD<6V is recommended to stabilize the output voltage and oscillation frequency.
Test Circuit
1.
2.
External parts（suggest）
1、Diode use Schottky diode such as IN5817 or IN5819 (forward voltage drop:0.2V)
2、Inductor：3.3μH（r<30mΩ）
3、Capacitor：ceramic capacitor 22μF（It is best to use two parallel connection ceramic capacitors）
4、Feed back resistors:R1+R2<50KΩ
V1.0
Page 5 of 11
5 Page 
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
ME2139
· The information described herein is subject to change without notice.
· Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or
diagrams described herein whose related industrial properties, patents, or other rights belong to
third parties. The application circuit examples explain typical applications of the products, and do
not guarantee the success of any specific mass-production design.
· Use of the information described herein for other purposes and/or reproduction or copying
without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited.
· The products described herein cannot be used as part of any device or equipment affecting the
human body, such as exercise equipment, medical equipment, security systems, gas equipment, or
any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing
Micro One Electronics Inc.
· Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high
quality and reliability, the failure or malfunction of semiconductor products may occur. The user of
these products should therefore give thorough consideration to safety design, including
redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires,
or community damage that may ensue.
V1.0
Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ME2139.PDF ] | |
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