-1- Digital cameras and MP3 Palmtop computers / PDAs Cellular phones Wireless handsets and DSL modems PC cards Portable media players
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1 Synchronous Buck DC/DC Converter YF1004 Features Up to 95% Efficiency Current mode operation for excellent line and load transient response Low quiescent current: 230µA Low Switch on Resistance R DS(ON), Internal Switch: 0.35Ω Output voltage:0.6v~5.5v Automatic PWM/PFM mode switching No Schottky diode required 1.4MHz fixed frequency switching Short-Circuit protection Shutdown quiescent current: < 1µA Low profile DFN3*3-10L package (lead-free packaging is now available) Application Digital cameras and MP3 Palmtop computers / PDAs Cellular phones Wireless handsets and DSL modems PC cards Portable media players Description The YF1004 is high efficiency synchronous, PWM step-down DC/DC converters working under an input voltage range of 2.5V to 5.5V. This feature makes the YF1004 suitable for single Li-lon battery-powered applications. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 200µA with no load, and drops to < 1µA in shutdown. The internal synchronous switch is desired to increase efficiency without an external Schottky diode. The 1.4 MHz fixed switching frequency allows the using of tiny, low profile inductors and ceramic capacitors, which minimized overall solution footprint. The YF1004 converters are available in the industry standard DFN3*3-10L power packages (or upon request). Order Information YF : Symbol 1 2 Description Denotes Output voltage: Adjustable Output Denotes Package Types: E: DFN3*3-10L -1-
2 Typical Application Pin Assignment PIN NUMBER PIN NAME FUNCTION DFN3*3-10L 1 V FB1 Output feedback 1 2 EN1 ON/OFF Control 1 (High Enable) 3 VIN Input 4 SW1 Switch Output 1 DFN3*3-10L 5 GND Ground 6 N/C 7 SW2 Switch Output 2 8 N/C 9 EN2 ON/OFF Control 2 (High Enable) 10 V FB2 Output feedback 2-2-
3 Functional Diagram -3-
4 Absolute Maximum Ratings Power Dissipation Internally limited V IN V ~ + 6 V V ON/OFF V ~ (V IN + 0.3) V V SW V ~ (V IN + 0.3) V V FB V ~ + 6 V I SW..1.3A Operating Temperature Range ~ + 85 Lead Temperature (Soldering 10 sec.) Storage Temperature Range.- 65 ~ Junction Temperature Electrical Characteristics Operating Conditions: T A =25, V IN =3.6V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V OUT Output Voltage I OUT = 100mA, R2(4)/R1(3)= V V IN Input Voltage Range V V FB Regulated Voltage T A = V I FB Feedback Current ±30 na V FB V REF V IN=2.5V~5.5V %/V F OSC Oscillator Frequency V FB = 0.6V or V OUT = 100% MHz I Q Quiescent Current V FB = 0.5V or V OUT = 90%, I LOAD = 0A µa I S Shutdown Current V EN = 0V, V IN = 4.2V µa I PK Peak Inductor Current V IN = 3V, V FB = 0.5V or V OUT = 90%, Duty Cycle < 35% A R PFET R DS(ON) of P-Channel FET I SW = 100mA Ω R NFET R DS(ON) of N-Channel FET I SW = -100mA Ω EFFI * Efficiency When connected to ext. components 93 % V IN=EN=3.6 V, I OUT=100mA V OUT V OUT Line Regulation V IN=2.5V~5.5V %/V V LOADREG V OUT Load Regulation 0.33 % EFFI = [(Output Voltage Output Current) / (Input Voltage Input Current)] 100% -4-
5 Typical Performance Characteristis VOUT=1.8V VOUT=2.5V CONVERSION EFFICIENCY CONVERSION EFFICIENCY ) % ( Y C N E I C I F F E OUTPUT CURRENT VIN=2.7V VIN=3.6V VIN=4.2V Y C N E I C I F F E OUTPUT CURRENT VIN=2.7V VIN=3.6V VIN=4.2V Output Noise 100mV/DIV AC COUPLED VIN=3.6V VOUT=1.8V 2ms/DIV ILOAD=0mA Output Noise 10mV/DIV AC COUPLED VIN=3.6V VOUT=1.8V ILOAD=200mA 200ns/DIV -5-
6 Typical Performance Characteristis Start up from shutdown Quiescent Supply Current vs. Supply Voltage Feed back Bias Current vs. Temp -6-
7 Typical Performance Characteristis Shutdown Current vs. Temp Switching Frequency vs. Temp Rds(on) vs. Temp Open/Closed Loop Current Limit vs. Temp -7-
8 Application Information PIN ASSIGNMENT V FB1 (Pin 1):Output feedback 1. Receives the feedback voltage from an external resistive divider across the output. In the adjustable version, the output voltage is set by a resistive divider according to the following formula: V OUT = 0.6V [1 + (R2/R1)]. EN1 (Pin 2): First en control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shutsdown the device. In shutdown, all functions are disabled drawing <1µA supply current. Do not leave EN floating. V IN (Pin 3): Main Supply Pin. Must be closely decoupled to GND, or with a 2.2µF or greater ceramic capacitor. SW1 (Pin 4): First switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. GND (Pin 5): Ground Pin. N/C(Pin 6): EN2 (Pin 7): Second en control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shutsdown the device. In shutdown, all functions are disabled drawing <1µA supply current. Do not leave EN floating. N/C(Pin8) SW2 (Pin 9): Second switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. V FB2 (Pin 10):Output feedback 2. Receives the feedback voltage from an external resistive divider across the output. In the adjustable version, the output voltage is set by a resistive divider according to the following formula: V OUT = 0.6V [1 + (R4/R3)]. -8-
9 PCB LAYOUT GUIDELINES When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the YF1004. These items are also illustrated graphically in Figures 1 and 2. Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the V IN trace should be kept short, direct and wide. 2. Does the V FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of C OUT and ground. 3. Does the (+) plate of C IN connect to V IN as closely as possible? This capacitor provides the AC current to the internal power MOSFETs. 4. Keep the switching node, SW, away from the sensitive V FB node. 5. Keep the ( ) plates of C IN and C OUT as close as possible. -9-
10 Packaging Information DFN3*3-10L Package Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.700/ / / /0.035 A A D E D E k 0.200MIN 0.008MIN b e 0.500TYP 0.020TYP L
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