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发布者:微桥 发布时间:2011-9-2 阅读:7228次    关键字: AX3117
AX3117/A-PWM Control 3A Step-Down Converter


AX3117/A-PWM Control 3A Step-Down Converter DataSheet

AX3117 for 5V2.1A Charger

GENERAL DESCRIPTION
    AX3117/A consists of step-down switching regulator with PWM control. The device includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
    AX3117/A provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly forms 0 up to 100%. An over current protection and short circuit protection functions are built outside that it can set by a resistance. An external compensation is easily to system stable; the low ESR output capacitor can be used. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L-EP package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 40V, it is also suitable for the operation via an AC adapter.

FEATURES
- Input Voltage􀎚8V to 40V
- Duty ratio􀎚0% to 100% PWM control
- Oscillation frequency􀎚100K/300KHz
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Current mode non-synchronous PWM converter
- External current limit setting.
- Under Voltage Lockout.
- Over Voltage Protection.
- Line-compensation built in.
- SOP-8L-EP Pb-Free package.

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