RP400N501B-TR-FE

RP400xxx1B SERIES HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS NO.EA-193-150909 OUTLINE RP400xxx1B Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23 or 6pin DFN(PLP). This converter starts up of low voltage (Typ.0.7V) operation from one to two alkaline or a nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) battery. This IC consists of a reference voltage unit with soft start, an error amplifier, phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control circuit, internal switches and a protection circuit. As a protection circuit, RP400xxx1B has a current limit circuit which limits the peak current of the inductor at each clock cycle. A low ripple high efficiency step up DC/DC converter can be composed of RP400xxx1B Series with only an inductor, a diode and capacitors. This converter is based on a fixed frequency current mode PWM control which goes to power save mode (VFM mode) at light load automatically. RP400xxx1B Series has built-in Anti-ringing switch to prevent switching node from ringing, when the converter enters the discontinuous current mode. The output voltage of RP400K001B can be set within 1.8~5.0V (recommended range of output voltage) by external divider resistors. FEATURES ● Low Start-up Voltage guaranteed ························0.7V ● Input Voltage Range ········································0.7V ~ 5.5V ● High Efficiency ···············································85% (100mA / 3.3V, VIN = 1.5V, 25°C) ● Output current ················································200mA / 3.3V (VIN = 1.5V) Typ.100mA / 2.0V (VIN = 1.2V) ● Internal Switch················································NMOS = 0.4Ω (VOUT = 3.3V, 25°C) ● Built-in Phase Compensation, Soft Start, Peak Current Limit Protection ● PWM Oscillator Frequency ································700kHz ● Output Voltage Range ······································Fixed: 1.8V to 5.0V with 0.1V Stepwise Adjustable: 1.8V ~ 5.0V (RP400K001B only) (Recommended range of output voltage) ● Stable with Ceramic Capacitors ● Small Package ···············································DFN(PLP)1820-6, SOT-23-5 ● Internal EMI suppression (Anti-ringing switch is included) APPLICATIONS ● MP3 players, PDA ● Digital Still Cameras ● LCD Bias Supplies ● Portable blood pressure meter ● Wireless Handset ● GPS 1 RP400xxx1B BLOCK DIAGRAMS 1. Adjustable Output: RP400K001B Lx VIN S tartup C irc uit C ontrol Logic B uffe r C urrent S ens e PW M C ontrol V O UT E rro rA m p f os c O sc VFB + V ref VF M C on tro l GND 2. Fixed Output: RP400xxx1B Lx VIN S tartup C ircu it C ontrol Logic B uff er C u rren t S ens e PW M C ontrol E rro rA m p fos c O sc + V F M C on trol V ref GND 2 V O UT - RP400xxx1B SELECTION GUIDE In the RP400 Series, output Voltage, Type of Output Voltage, and package for the ICs can be selected at the user’s request. Product Name RP400Kxx1B-TR RP400Nxx1B-TR-FE Package Quantity per Reel Pb Free Halogen Free DFN (PLP)1820-6 5,000 pcs Yes Yes SOT-23-5 3,000 pcs Yes Yes xx : Designation of output voltage 00: Adjustable Version (1.8V ~ 5.0V) * recommended range of output voltage / DFN(PLP)1820-6 only Fixed version is possible in the range from 1.8V to 5.0V with a step of 0.1V 3 RP400xxx1B PIN CONFIGURATION DFN(PLP)1820-6 SOT-23-5 5 6 1 5 2 4 3 4 1 (Bottom View) 2 3 (Top View) PIN DESCRIPTION RP400K001B: DFN(PLP)1820-6 Pin No Symbol Pin Description 1 VIN Power Supply Pin 2 NC No Connection 3 GND 4 Lx Internal NMOS Switch Drain Pin 5 VFB Feedback Input Pin for setting output voltage 6 VOUT Output Pin Ground Pin * Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but leaving it open is also acceptable. RP400Kxx1B: DFN(PLP)1820-6 Pin No Symbol Pin Description 1 VIN Power Supply Pin 2 NC No Connection 3 GND 4 Lx Internal NMOS Switch Drain Pin 5 NC No Connection 6 VOUT Output Pin Ground Pin * Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but leaving it open is also acceptable. RP400Nxx1B: SOT-23-5 4 Pin No Symbol 1 NC 2 GND 3 VIN 4 VOUT 5 Lx Pin Description No Connection Ground Pin Power Supply Pin Output Pin Internal NMOS Switch Drain Pin RP400xxx1B ABSOLUTE MAXIMAM RATINGS (GND=0V) Symbol Ratings Unit VIN Supply Voltage -0.3 to 6.0 V VOUT VOUT Pin Voltage -0.3 to 6.0 V VLX Lx Pin Input Voltage -0.3 to 6.0 V VFB VFB Pin Voltage ILX Lx Pin Output Current PD Power Dissipation * Ta Ambient Temp Range -40 to + 85 °C Tstg Storage Temp Range -55 to + 125 °C VIN Items RP400K001B -0.3 to 6.0 0.8 V A SOT-23-5 420 DFN(PLP)1820-6 880 mW * For Power Dissipation, please refer to PACKAGE INFORMATION. ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS) All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. 5 RP400xxx1B ELECTRICAL CHARACTERISTICS (Ta=25C) Symbol VIN Conditions Start-up Voltage 1 Load current =1mA Vhold1 Hold-on Voltage 1 (Once started) Load current=1mA IDD2 VFB VOUT ∆VOUT /∆Ta fosc ∆fosc /∆Ta RONN TYP. Feedback Voltage (Adjustable Version) Output-Voltage (Fixed Version) Output-Voltage Temperature Coefficient Switching Frequency Switching Frequency Temperature Coefficient NMOS On-Resistance (*1) Unit 5.5 V 0.9 V 0.7 V VIN=3V VOUT=5V VFB=0V 500 800 A Fixed Version. VIN=0.5VOUT VOUT= 0.95VOUT VOUT 100 (*3) A Adjustable Version VIN=VOUT=5V VFB=1.0V 160 300 A Fixed Version VIN=VOUT=5V 160 300 A 0.600 0.612 V 1.02 V Quiescent Current 1 Quiescent Current 2 (No switching) 0.7 MAX. Adjustable Version VIN=VOUT=3.3V 0.588 VIN= 1.5V 0.98 -40°C≤Ta≤85°C ppm /°C ±100 Adjustable Version VIN=VOUT=3.3V 595 700 805 kHz Fixed Version. VIN=VOUT=0.95VOUT 595 700 805 kHz -40°C≤Ta≤85°C ±0.2 kHz /°C VOUT=3.3V 0.4 Ω IFBH FB ”H” Input Current (Adjustable Version) VIN=VOUT=VFB=5V IXFBL FB ”L” Input Current (Adjustable Version) VIN=VOUT=5V VFB=0V ILxpeak MIN. Input Voltage Vstart1 IDD1 6 Item 0.5 A A -0.5 Adjustable Version VOUT=3.3V Detective at Duty=MaxDuty-5% 0.4 0.6 A Fixed Version. VOUT= 0.95VOUT Detective at Duty=MaxDuty-5% 0.4 0.6 A Lx Leak Current limit (*2) RP400xxx1B ELECTRICAL CHARACTERISTICS (cont.) (Ta=25C) Symbol Maxduty tstart RONA Item Max Duty Conditions TYP. MAX. Unit Adjustable Version VIN=VOUT=3.3V VFB=0V 80 88 95 % Fixed Version. VIN=VOUT=0.95VOUT 80 88 95 % Adjustable Version VIN=0V to 1.65V VOUT=3.3V At VOUT=2.97V 0.08 0.7 3.0 ms Fixed Version. VIN= 0V to VOUT 0.5 At VOUT=VOUT0.9 0.08 0.7 3.0 ms Adjustable Version VIN=VOUT=3.3V 110 Ω Fixed Version. VIN=VOUT=1.05VOUT 110 Ω Soft Start period Anti-ringing switch On Resistance MIN. *1) Guaranteed by design engineering. NMOS On-Resistance according to the VOUT voltage. *2) Lx limit current changes by Duty. *3) The maximum value of Operating Current 1(Fixed Version) is shown on the table below. VOUT (V) 1.8 V 1.9 V 2.0 V 2.1 V 2.2 V 2.3 V 2.4 V 2.5 V 2.6 V 2.7 V 2.8 V 2.9 V 3.0 V 3.1 V 3.2 V 3.3 V 3.4 V MAX (A) 290 310 320 340 360 370 390 400 420 440 450 470 480 500 520 530 550 VOUT (V) 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V MAX (A) 560 580 600 610 630 640 660 680 690 710 720 740 760 770 790 800 7 RP400xxx1B APPLICATION NOTES Adjustable Output Voltage Type (Version:B) Schottky Diode VOUT 1.8V to 5V L 10H(6.8H) V IN CIN 10F Lx RP400K001B V OUT COUT 10F GND R2 V FB R1 Fixed Output Voltage Type (Version:B) Schottky Diode VOUT 1.8V to 5V L 10H(6.8H) V IN CIN 10F Lx RP400xxx1B V OUT COUT 10F GND External components Capacitor Diode Inductor 8 : C2012JB1C106M (TDK) : CRS10I30A (TOSHIBA) : TDK SLF7045T-100M1R3-PF(TDK) RP400xxx1B ● Setting of Output Voltage Output voltage (1.8V to 5.0V recommended range of voltage) can be set with divider resistors for voltage setting, R1 and R2 as shown in the typical application. Refer to the next formula. Output Voltage = VFB  (R1 + R2) / R1 (VFB = 0.6V) Recommended value of resistors (R1 + R2) is lower than 100kΩ. Make sufficient power supply and ground and reinforce supplying. The large switching current could flow through the connection of power supply, inductor, ground, diode and the connection of VOUT. If the impedance of the connection of power supply and ground is high, the voltage level of power supply of the IC fluctuates with the switching current. We recommend you to use output capacitor and diode with an allowable voltage at least 1.5 times as much as setting output voltage. This is because there may be case where a spike-shaped high voltage is generated by an inductor when built-in transistor is on and off. Use a diode of a Schottky type with high switching speed, low reverse current and also pay attention to its current capacity. Set external components as close as possible to the IC and minimize the connection between the components and the IC. In particular, output capacitor should be connected to VOUT pin with IC ground by the minimum connection, because this IC uses the VOUT voltage as the main power supply, after start-up. Use capacitors with a capacity of 10F or more for VOUT pin. We recommend you to set a ceramic capacitor (10F) between VIN and ground. The divider resistors should be placed as close as possible to the IC ground pin. VFB line is recommended to use short line as well to avoid the influence of noise. Please select the inductor value 10H in the case of VOUT≧2.5V and 6.8H in the case of VOUT