FAN5308MPX
FAN5308MPX Datasheet
FAN5308 800mA High-Efficiency Step-Down DC-DC Converter
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FAN5308MPX |
FAN5308MPX (pdf) |
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| FAN5308 800mA High-Efficiency Step-Down DC-DC Converter June 2007 FAN5308 tm 800mA High-Efficiency Step-Down DC-DC Converter • 96% efficiency, synchronous operation • Adjustable output voltage options from 0.8V to VIN • 2.5V to 5.5V input voltage range • Up to 800mA output current • Fixed-frequency 1.3MHz PWM operation • High-efficiency, power-save mode • 100% duty cycle low-dropout operation • Soft-start • Output over-voltage protection • Dynamic output voltage positioning • 25µA quiescent current • Thermal shutdown and short-circuit protection • Pb-free 3x3mm 6-lead MLP package • Pocket PCs, PDAs • Cell phones • Battery-powered portable devices • Digital cameras • Hard disk drives • Set-top boxes • Point-of-load power • Notebook computers • Communications equipment Designed for use in battery-powered applications, the FAN5308 is a high-efficiency, low-noise synchronous PWM current mode and pulse skip power-save mode DC-DC converter. It can provide up to 800mA of output current over an input range from 2.5V to 5.5V. The output voltage can be externally adjusted over a range of 0.8V to 5.5V by means of an external voltage divider. At moderate and light loads, pulse skipping modulation is used. Dynamic voltage positioning is applied and the output voltage is shifted above nominal value for increased headroom during load transients. At higher loads, the system automatically switches over to current mode PWM control, operating at 1.3MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. To achieve high efficiency and ensure long battery life, the quiescent current is reduced to 25µA in power-save mode, and the supply current drops below 1µA in shut-down mode. The FAN5308 is available in a 3x3mm 6-lead MLP package. Ordering Information Product Number FAN5308 Output Voltage Adjustable Package Type 3x3mm 6-Lead MLP Order Code FAN5308MPX CIN 10uF PGND P1 AGND 3.3uH 5KΩ R2 10KΩ VOUT 1.2V 800mA COUT 2 x 10uF Figure Typical Application FAN5308 800mA High-Efficiency Step-Down DC-DC Converter Pin Configuration VIN 1 PGND 2 P1 AGND 6 SW 5 NC Pin Description Pin # P1 1 2 Name AGND VIN PGND Figure Pin Assignment for 3x3mm 6-Lead MLP Description Analog Ground. P1 must be soldered to the PCB ground. Supply Voltage Input. Power Ground. This pin is connected to the internal MOSFET switches. This pin must be externally connected to AGND. Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply current to less than 1µA. Do not float this pin. Feedback Input. Adjustable voltage option, connect this pin to the resistor divider. No Connection Pin. Switching Node. This pin is connected to the internal MOSFET switches. 2005 Fairchild Semiconductor Corporation FAN5308 800mA High-Efficiency Step-Down DC-DC Converter Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Parameter VIN Voltage On Any Other Pin Lead Soldering Temperature 10 seconds Junction Temperature Storage Temperature Thermal Resistance, Junction-to-Case 3x3mm 6-lead MLP 1 Electrostatic Discharge Protection ESD Level 2 HBM CDM Min. Max. VIN 260 150 8 Unit V °C °C °C °C/W Junction-to-ambient thermal resistance, is a strong function of PCB material, board thickness, thickness and number of copper planes, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics. Using Mil Std. 883E, method Human Body Model and EIA/JESD22C101-A Charged Device Model . Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Parameter Supply Voltage Range Output Voltage Range, Adjustable Version Output Current Inductor 3 Input Capacitor 3 Output Capacitor 3 Operating Ambient Temperature Range Operating Junction Temperature Range |
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