RP504x Series 600mA PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier The RP504x Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP504K/L can be switched from two control types by inputting signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP504N Series can be selected from fixed PWM control or PWM/VFM auto switching control.) RP504x includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2H) and output capacitor (4.7H) can be used by the switching of 2.25MHz. In addition to SOT-23-5 and DFN1616-6B packages, a 1.2mm x 1.6mm DFN(PLP)1216-6B package is also available. FEATURES * Supply Current (IDD1)*********************** Typ. 400A (VIN=VCE=5.5V, VOUT=VSETx0.8) * Supply Current (IDD2)*********************** Typ. 25A (VIN=VCE=VOUT=5.5V) * Standby Current (Istandby)****************** Max. 5A (VIN=5.5V, VCE=0V) * Input Voltage Range (VIN) *************** 2.3V to 5.5V * Output Voltage Range (VOUT)********** 0.8V to 3.3V (internally fixed) * Output Voltage Accuracy **************** 1.5% * Output Current (IOUT)*********************** 600mA * Oscillator Frequency (fosc)*************** 2.25MHz * Oscillator Maximum Duty Cycle (Maxduty) ** Min. 100% * UVLO Detect Voltage (VUVLO) ************* Typ. 2.0V * Soft Start Time (tstart)************************ Typ. 0.15ms * Coil-current Limit Circuit ***************** Current limit Typ. 900mA * Latch Protection Circuit ****************** Delay time for protection Typ. 1.5ms * Auto-Discharge Function**************** D Version * MODE pin *************************************** "H": PWM/VFM auto switching, * "L": fixed PWM (RP504N does not have MODE pin) Packages**************************************** DFN(PLP)1216-6F, DFN1616-6B, SOT-23-5 ) This is an approximate value, because output current depending on conditions and external parts. BLOCK DIAGRAM TYPICAL APPLICATION RP504L/K RP504L/K PVIN VIN L VIN LX VOUT 2.2H VIN Slope Compensation Chip Enable CE CIN 2.2F Current Feedback OSC Vref Current Protection PWM1 Control LX CE VOUT MODE GND COUT 4.7F Switching Control VOUT Soft Start L UVLO MODE CIN GND *1) MODE="H": PWM/VFM auto switchingMODE="L": fixed PWM Blue Line : only RP504Kxx1D, RP504Lxx1D COUT : MIPSZ2520D2R2MIPS2520D2R2 (FDK) MLP2520S2R2MVLS252010T-2R2M (TDK) CKP2520-2R2M (TAIYO YUDEN) : 2.2F: C1608JB0J225K (TDK) 2.2Fx2: C1005JB0J225K (TDK)JMK105BJ225MV (TAIYO YUDEN) 4.7F: C1005X5R0J475M (TDK)JMK105BJ475MV (TAIYO YUDEN) : C1608JB0J475K (TDK)GRM155B30J475KE18 (MURATA) SELECTION GUIDES Halogen Free Package DFN(PLP)1216-6F DFN1616-6B SOT-23-5 Q'ty per Reel Part No. 5,000 pcs RP504L .xx1-E2 5,000 pcs RP504K .xx1 -TR 3,000 pcs RP504N .xx1$ -TR-FE . . : Select from (.A.) With MODE pin, without auto-discharge function, (.D.) With MODE pin, with auto-discharge function, $ : Select from (.B.) PWM/VFM auto switching, without auto-discharge function, (.C.) Fixed PWM, without auto-discharge function, .xx. : Specify the output voltage within the range of 0.8V (.08.) to 3.3V (.33.) in 0.1V steps. PACKAGES (Top View) DFN(PLP)1216-6F 6 5 DFN1616-6B 4 6 5 TYPICAL CHARACTERISTIC SOT-23-5 5 4 RP504x (VOUT=3.3V) 4 1 1 2 3 4 5 6 2 3 VIN MODE CE VOUT GND LX 1 1 2 3 4 5 6 2 3 CE MODE VIN LX GND VOUT 1 1 2 3 4 5 2 3 VOUT GND LX VIN CE ) The tab is substrate level (GND). Efficiency (%) Efficiency vs. Output Current VIN=5.0V, VMODE=0V 100 VIN=4.3V, VMODE=0V 90 80 70 60 50 VIN=VMODE=4.3V 40 30 20 VIN=VMODE=3.6V 10 0 0.01 0.1 1 10 100 1000 Output Current IOUT (mA) APPLICATIONS * Power source for battery-powered equipment * Power source for hand-held communication equipment, cameras, and VCRs * Power source for compact HDD No.EK-259-110607 Step-down DC/DC Converter RP504x Series Step-down DC/DC Converter 600mA PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier RP50x Series 600mA Step-down DC/DC Converter Comparison RP504x Series Control Output Current *1 RP500x Series PWM/VFM auto switching / PWM/VFM auto switching / Fixed PWM Fixed PWM It can be switched by MODE pin RP502x Series RP503x Series PWM/VFM auto switching / Fixed PWM PWM/VFM auto switching 600mA 600mA 600mA 600mA Supply CurrentPWM Mode Typ. 400A Typ. 400A Typ. 750A - Supply CurrentVFM Mode Typ. 25A Typ. 100A Typ. 180A Typ. 20A Supply CurrentStandby Max. 5A Max. 5A Max. 5A Max. 5A 2.5V to 5.5V 2.5V to 5.5V Input Voltage Range Output Voltage Range Oscillator Frequency Output Voltage Accuracy Oscillator Maximum Duty Cycle UVLO Detect Voltage 2.3V to 5.5V 2.55V to 5.5V 0.8V to 3.3V 1.1V to 3.3V 0.8V to 3.3V 0.8V to 2.5V Typ. 2.25MHz Typ. 1.2MHz Typ. 3.3MHz Typ. 2MHz 1.5% 1.5% 1.5% 1.5% Min.100% Min.100% Min.100% Min.100% Typ. 2.0V Typ. 2.2V Typ. 2.2V Typ. 2.2V Soft-start Time Typ. 0.15ms Typ. 0.12ms Typ. 0.12ms Typ. 0.15ms Latch Protection Circuit Protection Delay Time Typ. 1.5ms Typ. 1.5ms Typ. 1.5ms Typ. 1.5ms Coil-current Limit Circuit Typ. 900mA Typ. 900mA Package DFN(PLP)1212-6F DFN1616-6B SOT-23-5*4 DFN Package A Version With MODE pin without auto-discharge function D Version With MODE pin Version with auto-discharge function SOT Package B Version Typ. 900mA 2 WLCSP-6-P2* 3 DFN1616-6* DFN(PLP)1820-6 SOT-23-6W 1 Version Typ. 800mA 2 WLCSP-6-P2* 3 DFN1616-6* 1 Version WLCSP-6-P2*2 3 DFN1616-6* 4 SOT-23-5* 1 Version PWM/VFM auto switching, PWM/VFM auto switching, PWM/VFM auto switching, without auto-discharge function without auto-discharge function without auto-discharge function 2 Version 2 Version Fixed PWM Fixed PWM without auto-discharge function without auto-discharge function 3 Version 3 Version PWM/VFM auto switching, with auto-discharge function PWM/VFM auto switching, with auto-discharge function 4 PWM/VFM auto switching, except for the DFN package without auto-discharge function 4 Version C Version Fixed PWM Fixed PWM with auto-discharge function without auto-discharge function 2 Version PWM/VFM auto switching, with auto-discharge function Version Fixed PWM with auto-discharge function *1) This is an approximate value, because output current depending on conditions and external parts. *2) RP500Z, RP502Z, and RP503Z are pin-compatible *3) RP500L, RP502L, and RP503L are pin-compatible *4) RP503N and RP504N are pin-compatible The currently available information as of June 2011 is provided in this New Product News. EK-259-110607