FAN5307MPX

FAN5307 High-Efficiency Step-Down DC-DC Converter Features ƒ 95% Efficiency, Synchronous Operation ƒ Adjustable Output Voltage Option: 0.7V to 0.8VIN ƒ 2.5V to 5.5V Input Voltage Range ƒ Customized Fixed Output Voltage Options ƒ Up to 300mA Output Current ƒ Fixed Frequency 1MHz PWM Operation ƒ High-Efficiency, Power-Save Mode ƒ 100% Duty Cycle Low Dropout Operation ƒ Soft Start ƒ Dynamic Output Voltage Positioning ƒ 15µA Quiescent Current ƒ Excellent Load Transient Response ƒ 5-Lead SOT-23 Package ƒ 6-Lead MLP 3x3mm Package Applications ƒ ƒ ƒ ƒ ƒ Pocket PCs, PDAs Description The FAN5307, a high-efficiency, low-noise synchronous PWM current mode and Pulse Skip (Power-Save) mode DC-DC converter, is designed for battery-powered applications. It provides up to 300mA of output current over a wide input range from 2.5V to 5.5V. The output voltage can be either internally fixed or externally adjustable over a wide range of 0.7V to 0.8VIN by an external voltage divider. Custom output voltages are also available. Contact a Fairchild sales representative for customized output voltage options. At moderate and light loads, pulse skipping modulation is used. Dynamic voltage positioning is applied, and the output voltage is shifted 0.8% above nominal value, for increased headroom during load transients. At higher loads, the system automatically switches to current mode PWM control, operating at 1 MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. In Power-Save mode, the quiescent current is reduced to 15µA to achieve high efficiency and ensure long battery life. In shutdown mode, the supply current drops below 1µA. The device is available in 5-lead SOT-23 and 6-lead MLP 3x3mm packages. Cell Phones Battery-Powered Portable Devices Digital Cameras Low Power DSP Supplies Ordering Information Part Number FAN5307S18X Operating Temperature Range VOUT (V) -40 to +85°C 1.8 Eco Status Packing Method 5-Lead SOT-23 RoHS Tape and Reel Green Tape and Reel Package FAN5307MP18 X -40 to +85°C 1.8 6-lead 3x3mm Molded Leadless Package (MLP) FAN5307S15X -40 to +85°C 1.5 5-Lead SOT-23 RoHS Tape and Reel FAN5307MP15 X -40 to +85°C 1.5 6-lead 3x3mm Molded Leadless Package (MLP) Green Tape and Reel FAN5307SX -40 to +85°C Adjustable 5-Lead SOT-23 RoHS Tape and Reel FAN5307MPX -40 to +85°C Adjustable 6-lead 3x3mm Molded Leadless Package (MLP) Green Tape and Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2005 Fairchild Semiconductor Corporation FAN5307 • Rev. 1.0.5 www.fairchildsemi.com FAN5307 — High-Efficiency Step-Down DC-DC Converter August 2009 EN GND VIN 1 6 2 5 3 4 CIN = 4.7µF FB PGND VOUT LX 10µH COUT=10µF Figure 1. 6-Lead 3x3mm (MLP) Figure 2. 5-Lead SOT-23 100 95 VIN=2.5V Efficiency [%] 90 VIN=3.6V 85 VIN=5.5V 80 75 70 65 0.01 0.1 1 10 100 1000 FAN5307 — High-Efficiency Step-Down DC-DC Converter Typical Applications Load Current [mA] Figure 3. Efficiency vs. Load Current (VOUT=1.8V) © 2005 Fairchild Semiconductor Corporation FAN5307 • Rev. 1.0.5 www.fairchildsemi.com 2 Figure 4. 5-Lead SOT-23 Figure 5. 6-Lead 3x3mm MLP Pin Definitions 5-Lead SOT-23 Pin # Name Description 1 VIN 2 GND 3 EN Enable Input. Logic HIGH enables the chip; logic LOW disables the chip and reduces supply current to