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PDF AX3021 Data sheet ( Hoja de datos )
| Número de pieza | AX3021 | |
| Descripción | 1.5A PWM Buck DC/DC Converter | |
| Fabricantes | AXElite | |
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Hay una vista previa y un enlace de descarga de AX3021 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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AX3021
200KHz, 1.5A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3021 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 1.5A load without additional transistor. It saves board space. The
external shutdown function can be controlled by logic level and then come into standby
mode. The internal compensation makes feedback control having good line and load
regulation without external design. Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage, and current limit is against over current
operating of the output switch. If current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced.
The AX3021 series operates at a switching frequency of 200KHz thus allow smaller
sized filter components than what would be needed with lower frequency switching
regulators. Other features include a guaranteed +3% tolerance on output voltage under
specified input voltage and output load conditions. The chips are available in a standard
8-lead SOP Expose-Pad package.
FEATURES
- Output voltage: adjustable output version.
- Adjustable version output voltage range: 0.75V to 22V+3%.
- 200KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 24V.
- Output load current: 1.5A.
- Expose-Pad (EP) SOP-8L Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.09, 2010
1 page  
AX3021
FUNCTION DESCRIPTIONS
Pin Functions
VCC
This is the positive input supply for the IC switching regulator. A suitable input bypass
capacitor must be presented at this pin to minimize voltage transients and to supply the
switching currents needed by the regulator.
VSS
Circuit ground.
SW
Internal switch. The voltage at this pin switches between (+VCC – VSAT) and
approximately – 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize coupling
to sensitive circuitry, the PC board copper area connected to this pin should be minimized.
Feedback
Senses the regulated output voltage to complete the feedback loop.
EN
Allows the switching regulator circuit to be shutdown using logic level signals thus
dropping the total input supply current to approximately 10uA. Pulling this pin below a
threshold voltage of approximately 0.5V shuts the regulator down, and pulling this pin
above 2.0V (up to a maximum of VCC) turns the regulator on.
Thermal Considerations
The SOP-8L package needs a heat sink under most conditions. The size of the heat
sink depends on the input voltage, the output voltage, the load current and the ambient
temperature. The AX3021 junction temperature rises above ambient temperature for a 1.5A
load and different input and output voltages.
For the best thermal performance, wide copper traces and generous amounts of PCB
copper (need connect to the VSS pins) should be used in the board layout, (One exception
is the SW pin, which should not have large areas of copper.) Large areas of copper provide
the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air
lowers the thermal resistance even further.
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.09, 2010
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX3021.PDF ] | |
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