IRDC3065 IRU3065 EVALUATION BOARD USER GUIDE INTRODUCTION SPECIFICATION DATA Inputs: The IRU3065 controller is designed to provide solu- JP1: Optional VDD input. Default VDD is connected tions for the applications requiring low power on board to VCC through a charge pump. switching regulators. The IRU3065 is specifically JP2: Optional Vref input. If accurate output is re designed for positive to negative conversion and uses quired, Vref should be connected to a accurate refer- few components for a simple solution. The IRU3065 ence voltage operates at high switching frequency (up to 1.5MHz), JP4: 5V Bus input and Vcc input (default connection). resulting in smaller components. The output voltage The output voltage will be equal to input voltage with can be set by using an external resistor divider. The negative sign. stability over all conditions is inherent with this archi- tecture without any compensation. The device is Outputs: available in the standard 6-Pin SOT-23. JP3. Vout=-5V @200mA. (see the IRU3065 data sheet for detailed description). Switching frequency Fs(MAX)=1.2 MHz Rev. 1.0 www.irf.com 1 10/20/04

IRDC3065 SCHEMATIC 1 2 3 4 D D JP4 Vin VIN/VCC R2 GND VGate JP1 VDD R7 Vdd R1 C3 + C GND 1 VGATEU1 VCC 6 Vcc QM1OSFET PC4 + C D1 C1 + IRU3065 2 GND VDD 5 J1 L2 D2 L3 JP3 3 VSNS ISNS 4Isns Vo VO JP2 C5 C6 GND R3 + + GND VREF/VCC B R4 B Vsns R5 R6 VRef A Title A Size Number Revision A Date: 2-Nov-2004 Sheet of File: E:\mqiao\IR_dcdc_IC\Iru3065\protel\JE3065~1.DDrDaBwn By: 1 2 3 4 Figure 1 - Schematic of IRU3065 evaluation-board. Bill of Material (BOM) Ref Designator Description Value Qty Part# Manuf Q1 MOSFET PFET 1 IRLML5203 IR U1 Controller 1 IRU3065 IR D1 Diode Fast Switchinh 1 BAT54 IR D2 Diode Fast Switchinh 1 10BQ015 IR L2 Inductor 1.2uA, 2A 1 LPO1704-122MC Coilcraft C1 Ceramic Cap 1uF, Y5V,16V 1 ECJ-2VF1C105Z Panasonic C3 Ceramic Cap 100pF, X7R,50V 1 ECJ-2VC1H100J Panasonic C6,C4 Ceramic Cap 10uF, X5R, 6.3V 2 ECJ2FBOJ106M Panasonic R4, R5 Resistor 10K, 1%, 0805 2 Any Any R3 Resistor 0.1Ohm, 0805 1 Any Any R1,R7 Resistor Open 2 R2,R6 Resistor Short 2 L3 Inductor Short 1 C5 Ceramic Cap Open 1 JP1,2,3,4 Terminal 4 ED1973-ND Digi-Key J1 Scope Probe 1 S1012-02-ND Digi-Key Bumpon 4 3M 2 www.irf.com Rev. 1.0 10/20/04

IRDC3065 Layout-Top layer and Bottom layer Rev. 1.0 www.irf.com 3 10/20/04

IRDC3065 Operation Characteristics Vout(V) vs Iout(mA) Efficiency versus load current 6 75 5 70 ) % 4 ( y 65 c V) en ut( 3 ci 60 Vo ffi 2 E 55 1 50 0 100 200 300 400 0 0 200 400 600 800 1000 Iout(mA) Iout(mA) Efficiency(%) with diode Efficiency(%) with 100 resistor Output voltage (absoutle value) versus load curren Efficiency with 1.2uH inductor, 800k Hz opera- (Vout=-5V, Iocp=400mA)t tion Frequency (KHz) versus load current Efficiency versus load current 900 800 75 ) 700 % 70 cy( 65 Hz) 600 n k e y( 500 ci 60 nc fi ue 400 Ef 55 eq Fr 300 50 200 0 100 200 300 400 100 Iout(mA) Efficiency(%) with diode 0 0 200 400 600 800 1000 Efficiency(%) with 100ohm resistor Iout(mA) Efficiency with 4.7uH inductor, 250kHz operation Frequency versus load current. (Vout=-5V, Iocp=400mA)t 4 www.irf.com Rev. 1.0 10/20/04

IRDC3065 Experimental waveforms Operation waveform with 450mA, the boundary of continuous mode and discontinuous mode. The out- Start Up put start out of regulation Operation waveform at 20mA load. Operation waveform with short output. Operation waveforms with 250mA load (normal operation) Rev. 1.0 www.irf.com 5 10/20/04

IRDC3065 IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 6 www.irf.com Rev. 1.0 10/20/04