SX1308 – High Efficiency 1.2MHz 2A Step Up Converter

Part Number : SX1308

Function : High Efficiency 1.2MHz 2A Step Up Converter

Manufactures : Suosemi

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Description :

SX1308 High Efficiency 1.2MHz 2A Step U85pTConverter 85T FEATURES • Integrated 80mΩ Power MOSFET • 2V to 24V Input Voltage • 1.2MHz Fixed Switching Frequency • Internal 4A Switch Current Limit • Adjustable Output Voltage • Internal Compensation • Up to 28V Output Voltage • Automatic Pulse Frequency Modulation Mode at Light Loads • up to 96% Efficiency • Available in a 6-Pin SOT23-6 Package APPLICATIONS • Battery-Powered Equipment • Set-Top Boxed • LCD Bais Supply • DSL and Cable Modems and Routers • Networking cards powered from PCI or PCI express slots GENERAL DESCRIPTION The SX1 308 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The SX1308 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life. The SX1308 features automatic shifting to pulse frequency modulation mode at light loads. The SX1308 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The SX1308 is available in a small 6-pin SOT-23 package. TYPICAL APPLICATION Efficiency Efficiency (%) Figure 1. Basic Application Circuit Iout (mA) Figure 2. Efficiency Curve Copyright ©2010 by Suosemi Corporation 1 SX1308 ABSOLUTE MAXIMUM RATINGS IN, EN voltages -0.3V to 26V Operating Temperature…. -40°C to +85°C FB Voltages ..-0.3V to 6V Junction Temperature ..160°C SW Voltage..-0.3V to 30V Storage Temperature Range -65°C to 150°C Peak SW Sink and Source Current 4A Lead Temperature (Soldering, 10s) …+300°C PACKAGE/ORDER INFORMATION SW 1 6 NC GND 2 5 IN FB 3 PIN DESCRIPTION SOSOTT2233–56 (S(MXT13350408)) 4 EN PIN NAME FUNCTION 1 SW Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. SW can swing between GND and 28V. 2 GND Ground Pin 3 FB Feedback Input. The FB voltage is 0.6V. Connect a resistor divider to FB. Regulator On/Off Control Input. A high input at EN turns on the converter, and a 4 EN low input turns it off. When not used, connect EN to the input supply for automatic startup. 5 IN Input Supply Pin. Must be locally bypassed. 6 NC NC Copyright ©2010 by Suosemi Corporation 2 ELECTRICAL CHARACTERISTICS SX1308 (VIN=VEN=5V, TA = 25°C, unless otherwise noted.) Parameter Conditions MIN TYP MAX unit Operating Input Voltage 2 24 V Under Voltage Lockout 1.98 V Under Voltage Lockout Hysteresis 100 mV Current (Shutdown) Quiescent Current (PFM) Quiescent Current (PWM) Switching Frequency VEN= 0V VFB=0.7V,No switch VFB=0.5V,switch 0.1 1 µA 100 200 µA 1.6 2.2 mA 1.2 MHz Maximum Duty Cycle EN Input High Voltage VFB = 0V 90 1.5 % V EN Input Low Voltage 0.4 V FB Vo […]

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SX1308 Datasheet


 
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