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PDF ME2129D535 Data sheet ( Hoja de datos )
| Número de pieza | ME2129D535 | |
| Descripción | ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL | |
| Fabricantes | Microne | |
| Logotipo |  |
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ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
Ver 03
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
Description
STEP-UP SWITCHING REGULATOR
Feature
The ME2129 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 ME2129 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.
l Low voltage operation: Start-up is guaranteed from
0.9 V(IOUT =1 mA )
l Duty ratio: Built-in PWM/PFM switching control
circuit 15 to 78 % .
l oscillator frequency300KHz
l External parts: coil, diode, capacitor, and transistor
l Output voltage range: 1.5V ~6.5 V
l Output voltage accuracy±2%
l Soft start function: 2 ms.
l PACKAGESOT-23-5
Selection Guide
Typical Application:
l Mobile phones (PDC, GSM, CDMA, IMT200 etc.)
l Bluetooth equipment
l PDA
l Portable communication modem
l Portable games
l Cameras
l Digital cameras
l Cordless phones
l Notebook computers
1/13
1 page  
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
Ver 03
ME2129F
Measuring conditionsVDD=VCE=3.3V Topt=25 Unless otherwise specified
Parameter
SYMBOL
CONDITIONS
MIN TYP
Feed back voltage
VFB
-
1.225
1.25
Input voltage
VIN
-
-
Operation start voltage VST1 IOUT=1mA
--
Oscillation start voltage
VST2
No external parts, voltage applied to
VOUT
-
-
Operation holding
voltage
VHLD
IOUT=1mA Measured by decreasing
VIN voltage gradually
0.7
-
Current consumption 1 ISS1 VFB=VFB(S)× 0.95
- 1.5
Current consumption 2 ISS2 VFB=1.5V
- 15
Current consumption
during shutdown
ISSS VCE=0V
- 0.01
Feed back voltage
temperature coefficient
Ta=-25—85
- ±50
Oscillation frequency
fosc
-
255 300
Max. duty ratio
MAXDUTY VFB=VFB(S)× 0.95
- 78
PWM/PFM switching
duty ratio
PFMDUTY VFB=VFB(S)× 1.5, no load
- 15
Shutdown pin input
voltage
VSH Measured the oscillation at LX pin
VSL1
Judged the stop of
oscillation at LX pin
VOUT≥1.5V
0.75
-
-
-
Shutdown pin input
voltage
ISH VCE=VFB(S)×0.95
ISL VCE=0V
-0.1 -
-0.1 -
Soft start time
tss
-
-2
Efficiency
EFFI
-
- 85
1. VOUT(S) is the set output voltage value,and VOUT is the typital value of the output voltage.
2. VOUT(S) can be set by using the rate of VFB and output voltage setting resisitors(R1,R2).
3. VFB(S) is the set output voltage value.
4. VDD/VOUT separate type:
1.8VVDD<6V is recommended to stabilize the output voltage and oscillation frequency.
MAX
1.275
6
0.9
UNITS CIRCUIT
V4
V4
V4
0.7 V 3
- V4
- mA 3
- uA 3
0.5 uA 3
- ppm/
345 kHz
-
-
-V
0.3 V
0.1 uA
0.1 uA
- mS
-
4
3
3
3
3
3
3
3
4
4
5/13
5 Page 
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
Ver 03
2Responses of CE pin CE: 0→2V
Iout=1mA
3. Output Current vs. Output Voltage
Iout=100mA
4. Output Current vs. Efficiency
11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ME2129D535.PDF ] | |
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