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PDF AX3123 Data sheet ( Hoja de datos )
| Número de pieza | AX3123 | |
| Descripción | 1.4MHz Asynchronous Step-Down DC/DC Converter | |
| Fabricantes | AXElite | |
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AX3123
23V, 1.8A, 1.4MHz Asynchronous Step-Down
DC/DC Converter
GENERAL DESCRIPTION
The AX3123 is a monolithic step-down switch mode converter with a built-in power
MOSFET. It achieves 1.8A output current over a wide input supply range with excellent
load and line regulation. Current mode operation provides fast transient response and
eases loop stabilization. Fault condition protection includes cycle-by-cycle current limit
and over temperature protection.
The AX3123 requires a minimum number of available standard external components.
The AX3123 is available in SOT-23-6L, TSOT-23-6L packages.
FEATURES
- 1.8A Output Current
- 180mΩ Internal Power MOSFET Switch
- Stable with Low ESR Output Ceramic Capacitors
- Up to 92% Efficiency
- Fixed 1.4MHz Frequency
- Current Mode Operation
- Over-Temperature Protection with Hiccup-Mode
- Cycle-by-Cycle Over Current Protection
- Wide 4.5V to 23V Operating Input Range
- Output Adjustable from 0.805V to 15V
- 10μA Shutdown Current
- Miniature Packages: SOT-23-6L and TSOT-23-6L
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Apr.17, 2012
1 page  
AX3123
ELECTRICAL CHARACTERISTICS
(VIN=12V, TA=25°C, unless otherwise specified.)
Parameter
Symbol
Conditions
Min Typ Max Unit
Feedback Voltage
4.5V ≤ VIN ≤ 23V 0.785 0.805 0.825 V
Switch-On Resistance (Note1)
Switch Leakage
Current Limit (Note1)
VEN = 0V,
VSW = 0V
- 180 - mΩ
- - 10 μA
- 3 -A
Oscillator Frequency
1.2 1.4 1.7 MHz
Fold-back Frequency
VFB = 0V
- 460 - KHz
Maximum Duty Cycle
- 85 - %
Minimum On-Time (Note1)
- 100 - ns
Under Voltage Lockout Threshold Rising
Under Voltage Lockout Threshold
Hysteresis
EN Input Low Voltage
4.1 4.4 4.7 V
- 250 - mV
- - 0.4 V
EN Input High Voltage
1.2 - - V
EN Input Current
VEN = 2V
VEN = 0V
- 2.0 - μA
- 0.1 - μA
Supply Current (Shutdown)
VEN = 0V
- 10 - μA
Supply Current (Quiescent)
VEN = 2V, VFB = 1V - 1.8 - mA
Over-Temperature Protection Threshold
(Note1)
- 150 - °C
Note1: Guaranteed by design
Note 2: VIN = 5V, VOUT = 3.3V, maximum load current is about 1.4A.
5/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Apr.17, 2012
5 Page 
AX3123
TYPICAL CHARACTERISTICS (CONTINUES)
VIN = 12V, VOUT = 3.3V, C1 = 10μF, C2 = 22μF, L1 = 4.7μH, TA = +25°C, unless otherwise
noted.
IOUT=0.2A
IOUT=1.8A
VEN, 5V/div.
VOUT 1V/div.
IL 1A/div.
VSW 5V/div.
40μs/div.
Startup Through Enable Waveform
IOUT=0.2A
VEN, 5V/div.
VOUT 1V/div.
IL 1A/div.
VSW 5V/div.
200μs/div.
Shutdown Through Enable Waveform
IOUT = 200mA to 1.8A step
VOUT 100mV/div.
VEN, 5V/div.
VOUT 1V/div.
IL 1A/div.
VSW 5V/div.
40μs/div.
Startup Through Enable Waveform
IOUT=1.8A
VEN, 5V/div.
VOUT 1V/div.
IL 1A/div.
VSW 5V/div.
40μs/div.
Shutdown Through Enable Waveform
VOUT 1V/div.
IL 1A/div.
IL 1A/div.
400μs/div.
Load Transient Waveform
20μs/div.
Short Circuit Test
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Apr.17, 2012
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX3123.PDF ] | |
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