RP402N501H-TR-FE

RP402x Series High Efficiency Small Packaged Step-up DC/DC Converter No. EA-317-180912 OUTLINE The RP402x is a high efficiency step-up DC/DC converter with synchronous rectifier. The device can start up with low voltage of typically 0.7 V which is ideal for the applications powered by either one-cell or two-cell alkaline, nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) batteries. Internally, the RP402x consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, 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 protection circuits. The RP402x is employing synchronous rectification for improving the efficiency or rectification by replacing diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance but also allows a design to reduce parts count. The RP402x is available in either internally fixed output voltage type or adjustable output voltage type. The RP402xxxxx is the internally fixed output voltage type. The RP402x00xx is the adjustable output voltage type, which allows output voltages that range from 1.8 V to 5.5 V via an external divider resistor. The RP402x provides the forced PWM control and the PWM/VFM auto switching control. Either one of these can be selected by inputting a signal to the MODE pin. The forced PWM control switches at fixed frequency rate in low output current in order to reduce noise. Likewise, the PWM/VFM auto switching control automatically switches from PWM mode to VFM mode in low output current in order to achieve high efficiency. The RP402N is available in the PWM/VFM auto switching control. However, the RP402N is also available in the forced PWM control as a custom-designed IC(1). The RP402x has a soft-start time of typically 0.5 ms. The RP402x features the complete output disconnect shutdown option and the input-to-output bypass shutdown option. The RP402xxxxA/ B/ E/ F incorporates the complete output disconnect shutdown option, which allows the output to be disconnected from the input. The RP402xxxxC/ D/ G/ H incorporates the inputto-output bypass shutdown option, which allows the output to be connected to the input. The RP402x is protected against damage by a short-current protection, an over-voltage lockout, an over voltage protection, an anti-ringing switch and a latch-type protection. An anti-ringing switch prevents the occurrence of noise when an inductor current reaches a discontinuous mode. The RP402x provides optional Latch function with current limit detection which can turn off the power in case the limit values are detected for a fixed time and current limit circuit controls peak inductor currents in every clock. The latch-type protection can be released by switching the CE pin from high to low while the power is turned on. The RP402x is offered in a compact 5-pin SOT23-5 package or a 8-pin DFN(PLP)2020-8 package. (1) As for the custom-designed IC, please contact our sales representatives. 1 RP402x No. EA-317-180912 FEATURES  Low Voltage Start-up ·································· Typ. 0.7 V  Input Voltage Range ··································· Fixed Output Voltage Type: 0.6 V to 4.8 V Adjustable Output Voltage Type: 0.6 V to 4.6 V  High Efficiency ·········································· 94% (100 mA/ 5.0 V, VIN = 3.6 V, 25°C) 90% (1 mA/ 5.0 V, VIN = 3.6 V, 25°C)  Output Current ·········································· 800 mA: VIN = 3.6 V, VOUT = 5.0 V  LX Driver ON Resistance ····························· NMOS/ PMOS: 0.20 Ω (VOUT = 5.0 V, 25°C)  PWM Oscillator Frequency ·························· 1.2 MHz (Normal PWM), 1.0 MHz (Forced PWM)  Output Voltage Range································· Fixed Output Voltage Type: 1.8 V to 5.5 V, 0.1 V step Adjustable Output Voltage Type: 1.8 V to 5.5 V (recommended)  OVLO Detector Threshold ··························· Typ. 5.1 V  OVP Detector Threshold ····························· Typ. 6.0 V  LX Peak Current Limit ································· Typ. 1.5 A  Latch Protection Delay Time························· Typ. 3.3 ms (RP402Kxx1x, RP402Nxx1x) Typ. 4.1 ms (RP402Kxx2x)  Soft-start Time ·········································· Typ. 0.5 ms  EMI Suppression (Built-in Anti-ringing Switch) (RP402Kxx1x, RP402Nxx1x)  Voltage Regulation at VIN > VOUT  Zero Input Complete Shutdown at VIN = 0 V  Input-to-Output Bypass Shutdown Option at CE = L (RP402xxxxC/ D/ G/ H)  Ceramic Capacitor Capable  Package ·················································· DFN(PLP)2020-8, SOT23-5 APPLICATIONS  MP3 Players, PDA  Digital Still Cameras  LCD Bias Supplies  Portable Blood Pressure Meter  Wireless Handset  GPS  USB-OTG  HDMI 2 RP402x No. EA-317-180912 SELECTION GUIDE The package type, the set output voltage, the PWM control type, the shutdown option, the MODE pin option, and the latch function are user-selectable options. Selection Guide Product Name RP402Kxx#$-TR RP402Nxx#$-TR-FE Package Quantity per Reel Pb Free Halogen Free DFN(PLP)2020-8 5,000 pcs Yes Yes SOT-23-5 3,000 pcs Yes Yes xx: Specify the set output voltage (VSET). 00: Adjustable Output Voltage Type (1.8 V to 5.5 V, recommended voltage range) xx: Fixed Output Voltage Type (1.8 V to 5.5 V, adjustable in 0.1 V step) Please note: SOT-23-5 package is only available with fixed output voltage type. #: Specify the PWM control type. 1: Normal PWM operation 2: Forced PWM operation $: Specify the combination of the shutdown option, the MODE pin option and the latch function. Version Shutdown Options at CE = L MODE Pin Latch Function A Complete Output Disconnect Yes Yes B Complete Output Disconnect Yes No C Input-to-Output Bypass Yes Yes D Input-to-Output Bypass Yes No E Complete Output Disconnect No Yes F Complete Output Disconnect No No G Input-to-Output Bypass No Yes H Input-to-Output Bypass No No Please refer to Selection Guide Table on the next page for detailed information. 3 RP402x No. EA-317-180912 Selection Guide Table Package Output Voltage Type #$ Shutdown Option at CE = L MODE Pin Function MODE Pin 1A 2A Complete Output Disconnect 1B Fixed Output Voltage Type 2B 1C 1D Input-toOutput Bypass DFN(PLP)2020-8 Yes 1A Adjustable Output Voltage Type 2A Complete Output Disconnect 1B 2B 1C 1D SOT-23-5 4 Fixed Output Voltage Type Input-toOutput Bypass 1E Complete Output 1F Disconnect Power Controlling Method “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Forced PWM Control Note: “H” recommended “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Forced PWM Control Note: “H” recommended “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Forced PWM Control Note: “H” recommended “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Forced PWM Control Note: “H” recommended “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control “H”: Normal PWM Control, “L”: PWM/VFM Auto Switching Control PWM/VFM Auto Switching Control PWM/VFM Auto Switching Control No 1G Input-toOutput 1H Bypass PWM/VFM Auto Switching Control PWM/VFM Auto Switching Control PWM Latch Controlling Function Method Normal PWM Yes Forced PWM Normal PWM No Forced PWM Normal PWM Yes Normal PWM No Normal PWM Yes Forced PWM Normal PWM No Forced PWM Normal PWM Yes Normal PWM No Normal PWM Normal PWM Normal PWM Normal PWM Yes No Yes No RP402x No. EA-317-180912 BLOCK DIAGRAMS *1 *2 This Bypass Switch is included in the RP402KxxxC / D only. This Latch Timer is included in the RP402KxxxA / C only. BYPASS SW *1 OVER VOLTAGE PROTECTION V IN Lx REVERSE DETECTOR VFM CONTROLLER MODE VREF OSCILLATOR POWER CONTROLLER STARTUP CIRCUIT + PWM CONTROLLER - VOUT BACKGATE CONTROLLER SOFT START CE CHIP ENABLE LATCH TIMER*2 SWITCHING CONTROLLER CURRENT PROTECTION SHORT PROTECTION RAMP COMPENSATION ＋ CURRENT FEEDBACK GND RP402Kxxxx Block Diagram *1 *2 This Bypass Switch is included in the RP402KxxxC / D only. This Latch Timer is included in the RP402KxxxA / C only. BYPASS SW *1 OVER VOLTAGE PROTECTION VIN Lx REVERSE DETECTOR VFM CONTROLLER MODE VREF POWER CONTROLLER STARTUP CIRCUIT + PWM CONTROLLER - VOUT OSCILLATOR BACKGATE CONTROLLER SOFT START CE CHIP ENABLE LATCH TIMER*2 SWITCHING CONTROLLER CURRENT PROTECTION SHORT PROTECTION RAMP COMPENSATION ＋ VFB CURRENT FEEDBACK GND RP402K00xx Block Diagram 5 RP402x No. EA-317-180912 *1 *2 This Bypass Switch is included in the RP402NxxxG/ H only. This Latch Timer is included in the RP402NxxxE/ G only. BYPASS SW *1 OVER VOLTAGE PROTECTION V IN Lx REVERSE DETECTOR VFM CONTROLLER VREF OSCILLATOR POWER CONTROLLER STARTUP CIRCUIT + PWM CONTROLLER - V OUT BACKGATE CONTROLLER SOFT START CE CHIP ENABLE LATCH TIMER*2 SWITCHING CONTROLLER CURRENT PROTECTION SHORT PROTECTION RAMP COMPENSATION ＋ CURRENT FEEDBACK GND RP402Nxxxx Block Diagram 6 RP402x No. EA-317-180912 PIN DESCRIPTION Top View 8 7 6 Bottom View 5 5 6 7 5 8 4  1 2 3 4 4 3 2 1 1 RP402K [DFN(PLP)2020-8] Pin Configurations 2 3 RP402N (SOT-23-5) Pin Configurations The tab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate level). It is recommended that the tab be connected to the ground plane on the board, or otherwise be left floating. RP402Kxxxx Pin Description Pin No. Symbol 1 MODE 2 NC 3 GND 4 Lx 5 VOUT 6 VIN 7 NC 8 CE Description Mode Pin(1) No Connection Ground Pin Internal NMOS Switch Drain Pin Output Pin Power Supply Pin No Connection Chip Enable Pin, Active-high RP402K00xx Pin Description Pin No. Symbol 1 MODE 2 NC 3 GND 4 Lx 5 VOUT 6 VIN 7 VFB 8 CE MODE Pin No Connection Ground Pin Internal NMOS Switch Drain Pin Output Pin Power Supply Pin Feedback Input Pin for Setting Output Voltage Chip Enable Pin, Active-high RP402Nxx1x Pin Description Pin No. Symbol 1 Lx 2 GND 3 CE 4 VIN 5 VOUT Description Internal NMOS Switch Drain Pin Ground Pin Chip Enable Pin, Active-high Power Supply Pin Output Pin (1) Description (1) MODE Pin = “H” is recommended for RP402Kxx2x. 7 RP402x No. EA-317-180912 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings Symbol Rating Unit VIN Pin Voltage −0.3 to 6.5 V VOUT VOUT Pin Voltage −0.3 to 7.0 V VLX LX Pin Voltage −0.3 to 6.5 V VCE CE Pin Voltage −0.3 to 6.5 V VFB VFB Pin Voltage (RP402K00xx only) −0.3 to 6.5 V MODE Pin Voltage (RP402Kxxxx only) −0.3 to 6.5 V VIN VMODE PD Parameter Power Dissipation (1) DFN(PLP)2020-8 1800 (JEDEC STD. 51-7) SOT-23-5 660 mW Tj Junction Temperature Range −40 to 125 °C Tstg Storage Temperature Range −55 to 125 °C 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 Recommended Operating Conditions Symbol Parameter Rating Unit VIN Input Voltage 0.6 to 4.8 V Ta Operating Temperature −40 to 85 °C RECOMMENDED OPERATING CONDITIONS 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. (1) 8 Refer to POWER DISSIPATION for detailed information. RP402x No. EA-317-180912 ELECTRICAL CHARACTERISTICS The specifications surrounded by are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C. RP402xxxxx Electrical Characteristics (Not applicable to RP402K00xx) Symbol Parameter Condition VSTART Start-up Voltage RL = 5.5 kΩ VHOLD Hold-on Voltage after start-up(1) RL = 5.5 kΩ VOVLO OVLO Voltage - VOVP OVP Voltage - IDD1 Quiescent Current 1 IDD2 Quiescent Current 2(2) Istandby VOUT ΔVOUT /ΔTa fosc Min. Typ. 0.7 (Ta = 25°C) Max. Unit 0.8 V 0.6 5.1 V 6.0 V VIN = VSET −0.4 V, VOUT = 0.95 x VSET 1.6 mA VIN = VSET −0.4 V, VOUT = VSET + 0.2 V 21 37 RP402xxxxA/ B/ E/ F VIN = 4.8 V, VOUT = 0V, VCE = 0V 0.2 1.0 RP402xxxxC/ D/ G/ H VIN = 4.8 V, VCE = 0 V 1.2 2.5 Standby Current Output Voltage VIN = VCE = 1.5 V Output-Voltage Temperature Coefficient −40°C ≤ Ta ≤ 85°C Switching Frequency RP402xxx1x RP402xxx2x VIN = 1.5 V, VOUT = 0.95 x VSET 4.8 V x0.985 x1.015 900 850 µA V ppm /°C 50 1080 1020 µA 1200 1320 1380 1000 1100 1150 kHz RONN NMOS ON Resistance(1) VOUT = 5.0 V 0.20 Ω RONP PMOS ON Resistance(1) VOUT = 5.0 V 0.20 Ω ICEH CE ”H” Input Current VIN = 4.8 V, VOUT = VCE = 5 V ICEL CE ”L” Input Current VIN = 4.8 V, VOUT = 5 V, VCE = 0 V RP402xxx1x 0.5 −0.5 µA µA VIN = 4.8V, VCE = 0 V, VMODE = 5.5 V 0.5 IMODEH MODE ”H” Input Current(3) IMODEL MODE ”L” Input Current(3) VIN = 4.8 V, VCE = VMODE = 0V ILXH Lx ”H” Leakage Current VIN = VOUT = VLX = 4.8V, VCE = 0 V 0.5 µA ILXL Lx ”L”Leakage Current VOUT = 5 V, VLX = 0 V, VCE = 0 V 0.5 µA ILXPEAK RP402xxx2x Lx Limit Current(4) 72 −0.5 1.3 µA µA 1.5 A All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C). (1) Hold-on Voltage and NMOS/ PMOS ON Resistance are dependent on VOUT. Quiescent Current 2 is not applicable to RP402xxx2x. (3) MODE “H”/ “L” Input Current/ Voltage is only applicable to RP402Kxxxx. (4) L Limit Current fluctuates depending on Duty. X (2) 9 RP402x No. EA-317-180912 ELECTRICAL CHARACTERISTICS (continued) The specifications surrounded by are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C. RP402xxxxx Electrical Characteristics (Not applicable to RP402K00xx) Symbol Parameter Condition VCEH CE ”H” Input Voltage VCEL CE “L” Input Voltage (Ta = 25°C) Min. Typ. Max. 0.7 V 0.3 (1) VMODEH MODE ”H” Input Voltage VMODEL MODE ”L” Input Voltage (1) Unit V V 1.0 0.4 V Oscillator Maximum Duty Cycle VIN = 1.5 V, VOUT = 0.95 x VSET 80 88 95 % tstart Soft-start Time(2) Measures the time when VCE = 0 V to 1.5 V, VOUT = VSET x 0.95 0.25 0.5 0.70 ms tprot Protection Delay Time(3) RP402xxx1x 2.7 3.3 3.9 ms RP402xxx2x 3.5 4.1 4.7 Maxduty RONA Anti-ringing Switch ON RONB Bypass Switch ON Resistance(5) IINZERO VIN Zero Current Resistance(4) RP402xxxxC/ D/ G/ H VIN = 2.5 V, VOUT = 3.3 V 100 Ω VIN = 3.0 V, VOUT = 0 V 160 Ω VIN = 0 V, VOUT = 5.5 V 0.1 1.0 µA All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C). (1) MODE “H”/ “L” Input Current/ Voltage is only applicable to RP402Kxxxx. VIN ≥ 1.7 V (3) Protection Delay Time is not included in RP402xxxxB/ D/ F/ H. (4) Anti-ringing Switch ON Resistance is dependent on V OUT. Not applicable to RP402xxx2x. (5) Bypass Switch ON Resistance is dependent on V . IN (2) 10 RP402x No. EA-317-180912 Electrical Characteristics by Differenct Output Voltage VOUT (Ta = 25°C) Product Name Min. Typ. Max. RP402x18xx 1.773 1.800 1.827 RP402x19xx 1.872 1.900 1.929 RP402x20xx 1.970 2.000 2.030 RP402x21xx 2.069 2.100 2.132 RP402x22xx 2.167 2.200 2.233 RP402x23xx 2.266 2.300 2.335 RP402x24xx 2.364 2.400 2.436 RP402x25xx 2.463 2.500 2.538 RP402x26xx 2.561 2.600 2.639 RP402x27xx 2.660 2.700 2.741 RP402x28xx 2.758 2.800 2.842 RP402x29xx 2.857 2.900 2.944 RP402x30xx 2.955 3.000 3.045 RP402x31xx 3.054 3.100 3.147 RP402x32xx 3.152 3.200 3.248 RP402x33xx 3.251 3.300 3.350 RP402x34xx 3.349 3.400 3.451 RP402x35xx 3.448 3.500 3.553 RP402x36xx 3.546 3.600 3.654 RP402x37xx 3.645 3.700 3.756 RP402x38xx 3.743 3.800 3.857 RP402x39xx 3.842 3.900 3.959 RP402x40xx 3.940 4.000 4.060 RP402x41xx 4.039 4.100 4.162 RP402x42xx 4.137 4.200 4.263 RP402x43xx 4.236 4.300 4.365 RP402x44xx 4.334 4.400 4.466 RP402x45xx 4.433 4.500 4.568 RP402x46xx 4.531 4.600 4.669 RP402x47xx 4.630 4.700 4.771 RP402x48xx 4.728 4.800 4.872 RP402x49xx 4.827 4.900 4.974 RP402x50xx 4.925 5.000 5.075 RP402x51xx 5.024 5.100 5.177 RP402x52xx 5.122 5.200 5.278 RP402x53xx 5.221 5.300 5.380 RP402x54xx 5.319 5.400 5.481 RP402x55xx 5.417 5.500 5.582 11 RP402x No. EA-317-180912 ELECTRICAL CHARACTERISTICS (continued) The specifications surrounded by are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C. RP402K00xx Electrical Characteristics Symbol VIN Parameter Condition Start-up Voltage RL = 5.5 kΩ VHOLD Hold-on Voltage after start-up(1) RL = 5.5 kΩ VOVLO OVLO Voltage VOVP OVP Voltage IDD1 Quiescent Current 1 IDD2 Quiescent Current 2(2) VFB Typ. Input Voltage VSTART Istandby Min. Standby Current 4.6 V 0.8 V V 0.6 5.1 V 6.0 V VIN = 3 V, VOUT = 5 V, VFB = 0.6 V 1.6 mA VIN = 4.8 V, VOUT = 5.5 V, VFB = 2.0 V, VMODE = 0 V 21 37 RP402KxxxA/ B VIN = 4.8 V, VOUT = 0V, VCE = 0V 0.2 1.0 RP402KxxxC/ D VIN = 4.8 V, VCE = 0 V 1.2 2.5 1.00 1.015 4.6 Feedback Voltage VIN = 3.0 V, VOUT = 5 V ΔVFB /ΔTa Output Voltage Temperature Coefficient −40°C ≤ Ta ≤ 85°C fosc Switching Frequency RP402K001x RP402K002x RONN NMOS ON Resistance(1) RONP Resistance(1) PMOS ON 0.7 (Ta = 25°C) Max. Unit VIN = 3.0 V, VOUT = 3.3 V, VFB = 0.6 V µA V ppm /°C 50 1080 1020 1200 1320 1380 900 850 1000 1100 1150 kHz VOUT = 5.0 V 0.20 Ω VOUT = 5.0 V 0.20 Ω ICEH CE ”H” Input Current VIN = 4.8 V, VOUT = VCE = 5.5 V ICEL CE ”L” Input Current VIN = 4.8 V, VOUT = 5 V, VCE = 0 V RP402K001x 0.985 µA 0.5 −0.5 µA µA 0.5 VIN = 4.8 V, VMODE = 5.5 V, VCE = 0 V IMODEH MODE ”H” Input Current IMODEL MODE ”H” Input Current VIN = 4.8 V, VCE = VMODE = 0V ILXH Lx ”H” Leakage Current VIN = VOUT = VLX = 4.8 V, VCE = 0 V 0.5 µA ILXL Lx ”L”Leakage Current VOUT = 5.0 V, VLX = 0 V, VCE = 0 V 0.5 µA ILXPEAK RP402K002x Lx Limit Current(3) 72 −0.5 1.3 µA µA 1.5 A All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C). (1) Hold-on Voltage and NMOS/ PMOS ON Resistance are dependent on VOUT. Quiescent Current 2 is not applicable to RP402K002x. (3) L Limit Current fluctuates depending on Duty. X (2) 12 RP402x No. EA-317-180912 ELECTRICAL CHARACTERISTICS (continued) The specifications surrounded by are guaranteed by design engineering −40°C ≤ Ta ≤ 85°C. RP402K00xx Electrical Characteristics Symbol Parameter VCEH CE ”H” Input Voltage VCEL CE ”L” Input Voltage VMODEH MODE ”H” Input Voltage VMODEL MODE ”L” Input Voltage Maxduty Condition Min. Typ. (Ta = 25°C) Max. Unit 0.7 V 0.3 V 1.0 Oscillator Maximum Duty Cycle Time(1) V 0.4 V 88 95 % 0.25 0.5 0.70 ms VIN = 3.0 V, VOUT = 3.3 V, VFB = 0.6 V 80 Measures the time when VOUT = 3.3 V, VCE = 0 V to 1.5 V, VOUT = 3.13 V tstart Soft-start tprot Protection Delay Time(2) RONA Anti-ringing Switch ON Resistance(3) VIN = 2.5 V, VOUT = 3.3 V 100 Ω RONB Bypass Switch ON Resistance(4) VIN = 3.0 V, VOUT = 0 V 160 Ω VIN = 0 V, VOUT = 5.5 V 0.1 IINZERO RP402K001x - 2.7 3.3 3.9 ms RP402K002x - 3.5 4.1 4.7 ms RP402KxxxC/ D VIN Zero Current 1.0 µA All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C). (1) Soft-start Time is VIN ≥ 1.7 V. Quiescent Current 2 is not applicable to RP402K002x. (3) L Limit Current fluctuates depending on Duty. X (4) Bypass Switch ON Resistance is dependent on V IN. (2) 13 RP402x No. EA-317-180912 THEORY OF OPERATION Forced PWM Control Type (RP402xx2A/ B) While normal PWM control type prevents the reverse inductor current at light load, forced PWM control type makes the inductor current reverse in order to eliminate the discontinuous current period. Therefore, even at light load or when the voltage difference between input and output is less, forced PWM control type can provide PWM operation without bursting. Normal PWM IL x Lx Forced PWM IL x Lx Operating Waveform of Normal PWM/ Forced PWM Control Type There is a case that forced PWM control performs burst operation without PWM operation because of the conditions of use. The conditions which cause burst operation are various and differ in set output voltage, input voltage, ambient temperature and load current. Please note that forced PWM control type decreases the efficiency at light load and does not include antiringing switch. The graph below indicates the typical operational maximum input voltage of forced PWM control type. RP402Kxx1x: MODE = ”H” (Normal PWM), RP402Kxx2x: (Forced PWM) RP402K33xx 1.8 3.5 1.6 3 1.4 1.2 1 0.8 0.6 0.4 RP402K181x 0.2 RP402K182x 0 2.5 2 1.5 1 RP402K331x RP402K332x 0.5 0 1 14 ( Ta = 25°C) ( Ta = 25°C) Input Voltage @ PWM [V] Input Voltage @ PWM [V] RP402K18xx 10 Output Current IOUT [mA] 100 1 10 Output Current IOUT [mA] 100 RP402x No. EA-317-180912 RP402K50xx RP402K55xx ( Ta = 25°C) ( Ta = 25°C) 5 6 4 Input Voltage @ PWM [V] Input Voltage @ PWM [V] 4.5 3.5 3 2.5 2 1.5 RP402K501x RP402K502x 1 0.5 5 4 3 2 RP402K551x RP402K552x 1 0 0 1 10 Output Current IOUT [mA] 1 100 10 Output Current IOUT [mA] 100 MODE Pin (RP402K only) When setting the MODE pin “high” of RP402K, it is recommended to connect the MODE pin “high” with the VOUT pin to ensure stability. Please note that a current flows through the pull-down resistor to consume power even in a standby state (CE=”low”) as the MODE pin is pulled down by an internal resistor when the Mode pin “high” is connected with VIN pin. Since RP402Kxx2A/B have only Forced PWM control type, the MODE pin “high” fixing is recommended to ensure safety, but also connecting the MODE pin to GND or using it in the open state are other options. Bypass Mode Application Example (RP402xxxxC/ D/ G/ H) The RP402xxxxC/ D/ G/ H is available in bypass mode when CE = L. The shown below is the application example of the device in bypass mode. In this application, when the main system is not in sleep, the RP402xxxxC/ D/ G/ H is set to active state to supply power to the main system and RTC. When the main system is in sleep, the RP 402xxxxC/ D/ G/ H is set to standby state to supply power to RTC in bypass mode. Using the device in the bypass mode can reduce the power loss and the consumption of battery. Also, using the device in bypass mode can eliminate external components for short-circuit protection. L C1 CE Control LX VIN CE RP402xxxx C/ D/ G/ H VOUT MODE GND Main System (VSET) C2 VOUT RTC (A small amount of current is required.) 15 RP402x No. EA-317-180912 Regulation Operation at VIN > VOUT The RP402x regulates the output voltage to the set output voltage even when the input voltage is higher than the set output voltage. Please note that this regulation operation decreases the efficiency and the maximum output current driving ability. The maximum output current driving ability can be different due to the set output voltage, the input voltage and the ambient temperature. The following is the switching condition (Typ.) from step-up operation to the step-down regulation. VIN ≤ VOUT−150 mV: Step-down regulation → Step-up operation VIN > VOUT−100 mV: Step-up operation → Step-down regulation Output Current vs.Input Voltage RP402xxxxx ILX vs.Input Voltage RP402xxxxx VOUT = 3.3V 500 600 450 550 400 500 350 300 ILX [mA] Output Current IOUT [mA] VOUT = 3.3V 250 200 150 450 400 350 300 100 250 50 200 0 3 3.5 4 4.5 5 3 3.5 4 4.5 5 5.5 Input Voltage VIN [V] Input Voltage VIN [V] Output Voltage Setting for RP402K00xx The RP402K00xx can set the output voltage freely by the external divider resistors using the following equation. Output Voltage = VFB  (R1 + R2) / R2 (VFB = 1.0 V) Zero Input Complete Shutdown at VIN = 0 V The RP402x provides a zero input complete shutdown function that allows the device to shut down the output when VIN = 0 V or VIN = open. This function protects against reverse current flow from VOUT to VIN when a voltage is applied to the VOUT pin while VIN = 0 V or VIN = open. Overcurrent Protection The RP402x incorporates a LX peak current limit circuit as the overcurrent protection circuit which controls the duty of LX when the LX peak current (ILXPEAK) reaches typically 1.5 A. Latch Type Protection (RP402xxxxA/ C/ E/ G) The RP402xxxxA/ C/ E/ G provides a latch type protection circuit to latch the power MOSFET to the off state in order to stop the DC/DC operation. To release the latch type protection, switch the CE pin from high to low once and switch it back to high while the power is turned on. Please note that the LX peak current (ILXPEAK) and the protection delay time (tprot) are easily affected by the self-heating or heat radiation efficiency. The large reduction in input voltage (VIN) or the unstable input voltage caused by short-circuit may affect the protection operation or protection delay time. 16 RP402x No. EA-317-180912 Short-circuit Protection The RP402x provides a short-circuit protection which stops the switching operation when a short circuit is detected. After a consecutive fixed period of the short-circuit state, the device performs a restart with soft-start operation. RP402xxxxA/ C/ E/ G latches the power in a stop state when the input voltage becomes lower than typically 1.6V and it is short-circuited. Overvoltage Protection The RP402x provides an overvoltage lockout (OVLO) circuit for monitoring the input pin voltage and an overvoltage protection (OVP) circuit for monitoring the output pin voltage. These circuits stops the switching operation when an overvoltage is detected. If the output voltage is dropped below the set output voltage when OVLO is released, the output voltage will be boosted to the set output voltage. 17 RP402x No. EA-317-180912 OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS Operation of Step-up DC/DC Converter and Output Current Basic Circuit Pch Tr. Coil(L) IOUT VIN VOUT Nch Tr. CL GND The inductor current (IL) flowing through the inductor (L) Discontinuous Mode Continuous Mode IL max IL IL IL max IL min IL min tf Iconst t ton t =1/fosc t ton toff toff t =1/fosc A PWM control type step-up DC/DC converter has two operation modes characterized by the continuity of inductor current: discontinuous current mode and continuous current mode. The voltage applied to the inductor L, when transistor is ON, is described as “VIN”. So, the current is described as “VIN x t / L”. Therefore, the electric power (PON) supplied from the input side, while transistor is ON, is described as follows: ton PON   VIN2  t/L dt ··························································································· Equation 1 0 18 RP402x No. EA-317-180912 In step-up circuit, power source supplies the electric power (POFF) even while transistor is OFF. The input current supplied by power source while transistor is OFF is described as “(VOUT − VIN) x t / L”. Therefore, the electric power POFF is described as follows: POFF   tf 0 VIN  (VOUT  VIN)  t/L dt ······································································· Equation 2 The time of which the inductance L releases the saved energy is described as “tf”. Therefore, the average electric power (PAV) in a cycle is described as follows: PAV  1/(ton toff) { ton 0 VIN2  t/L dt   tf 0 VIN  (VOUT  VIN)  t/L dt} ···················· Equation 3 In PWM control, when “tf = toff”, the inductor current becomes continuous, so the switching regulator operation turns into continuous current mode. The current deviation between On time and Off time is equal under steadystate condition of continuous current mode as follows: VIN x ton/ L = (VOUT − VIN) x toff / L ··············································································· Equation 4 The electric power (PAV) is equal to the output voltage (VOUTIOUT). Therefore, IOUT is as follows: IOUT = fosc x VIN2 x ton2 / {2 x L (VOUT - VIN)} = VIN2 x ton / (2 x L x VOUT) ································ Equation 5 When IOUT becomes more than VIN  ton  toff / (2  L  (ton + toff)), the inductor current becomes continuous, so the switching regulator operation turns into continuous current mode. The continuous inductor current is described as ICONST, so IOUT is described as follows: IOUT = fosc x VIN2 x ton2 / (2 x L (VOUT − VIN)) + VIN x Iconst / VOUT ········································ Equation 6 The peak current (ILmax) flowing through the inductor is described as follows: ILmax = Iconst + VIN x ton / L ····················································································· Equation 7 Put Equation 4 into Equation 6 to solve ILmax. ILmax is described as follows: ILmax = VOUT / VIN x IOUT + VIN x ton / (2 x L) ·································································· Equation 8 However, ton = (1 − VIN / VOUT) / fosc. The peak current is more than IOUT. Please consider ILmax when setting conditions of input and output, as well as selecting the external components. The peak current in the discontinuous current mode in Equation 7 can be calculated by Iconst = 0. Please note: The above calculation formulas are based on the ideal operation of the device in continuous mode. The loss caused by the external components and the built-in Lx switch are not included. Please use the peak current in Equation 8 as a reference when selecting an inductor. 19 RP402x No. EA-317-180912 TIMING CHART Soft-start Operation and Latch-type Protection Operation Input Voltage CE Voltage Output Current 1.60V (Typ.) Output Voltage LX Voltage tprot RP402xxx1x 3.3ms (Typ.) RP402xxx2x 4.1ms (Typ.) 0.5ms (Typ.) Standby *1 *2 Low-Boost Mode Soft Start Period VFM Mode*1 PWM Mode LX-Peak Current Limit Latch Protect*2 Only for RP402xxx1x (MODE = ”L”) Only for RP402xxxxA/ C/ E/ G < Start-up > When CE is changed from ”L” to ”H”, DC/DC converter starts up the operation. The RP402x has Low-Boost mode which can start up with low voltage such as 0.7 V. The DC/DC boosts up with Low-Boost mode until the output voltage reaches to typically 1.6 V. When the output voltage becomes more than or equal to typically 1.6 V, the soft-start operation starts in order to control inrush current. The DC/DC boosts up the output voltage until it reaches to the setting output voltage. 20 RP402x No. EA-317-180912 Please note: During Low-Boost mode, the oscillator frequency is dropped, so the step-up ability is low compared to the normal operation mode. Please pay attention to the step-up ratio and the load current. Softstart time depends on “set output voltage”, “input voltage”, “ambient temperature”, and “load current”. Soft Start Period vs.Input Voltage RP402xxxxx RL = 5.5kΩ ( Ta = 25°C ) 100.0 Soft Start Period vs.Ta RP402x33xx 1.0 VOUT = 3.3V VIN = 1.8V RL = 5.5kΩ 0.9 10.0 VSET=1.8V VSET=3.3V VSET=5.5V 1.0 Soft-start Time [ms] Soft-start Time [ms] 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.1 0.0 0 1 2 3 Input Voltage VIN [V] 4 5 -50 -25 0 25 50 75 100 Ta [℃] 21 RP402x No. EA-317-180912 APPLICATION INFORMATION L C1 CE Control MODE Control LX VIN RP402Kxxxx VOUT CE C2 VOUT MODE GND RP402Kxxxx Typical Application (Fixed Output Voltage Type) L C1 CE Control MODE Control LX VIN RP402K00xx VOUT C2 CE MODE VOUT RSPD R1 CSPD VFB GND R2 RP402K00xx Typical Application (Adjustable Output Voltage Type) L C1 CE Control LX VIN RP402Nxx1x CE VOUT C2 VOUT GND RP402Nxx1x Typical Application (Fixed Output Voltage Typ) 22 RP402x No. EA-317-180912 Recommended Components Symbol L C1 (CIN) Descriptions VLF403215MT-2R2M, 2.2 µH, TDK VLS3012HBX-2R2M, TDK NRS5020T2R2NMGJ, TAIYO YUDEN GRM188R60J106ME47, 10 µF, Murata GRM188R60J106ME47, 10 µF x 2, Murata C2 (COUT) As for the fixed output voltage type (RP402x50xx), 10 µF x 1 can be used if the mounting area is limited. The speedup capacitor (CSPD) is required for the adjustable output voltage type. Connect CSPD in parallel with the output resistor (R1). To calculate the CSPD value, the following equation can be used: f = 1 / (2 π × CSPD × R1) CSPD Adjust the CSPD value to make the oscillator frequency (f) approximately 20 kHz. For example, VOUT = 5.0 V, R1 = 2 MΩ, R2 = 500 kΩ and CSPD = 4 pF. The R1 and R2 values are calculated based on the operation efficiency under a light load, therefore R1 and R2 are having high-resistance values. The feedback voltage (VFB) can be affected by noise. To stabilize the device operation, decrease the R1 and R2 values. The speedup resistor (RSPD) is required for the adjustable output voltage type. RSPD Using RSPD can prevent the deterioration of the characteristics due to noise. If there’s a possibility of generation of a spike noise, use an approximately 1 kΩ RSPD. 23 RP402x No. EA-317-180912 TECHNICAL NOTES The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A peripheral component or the device mounted on PCB should not exceed its rated voltage, rated current or rated power. When designing a peripheral circuit, please be fully aware of the following points. (Refer to PCB Layout Considerations below.)  Ensure the VIN and GND lines are firmly connected. A large switching current flows through the GND lines and the VIN line. If their impedance is too high, noise pickup or unstable operation may result. When the built-in switch is turned off, the inductor may generate a spike-shaped high voltage. Use the highbreakdown voltage capacitor (COUT) which output voltage is 1.5 times or more than the set output voltage.  After a boosting of the step-up converter, the converter uses VOUT as a main power source. Therefore, the ceramic capacitor between the VOUT pin and the GND pin acts as a bypass capacitor. Considering the bias dependence, place a 10 µF or more ceramic capacitor (COUT) between the VOUT pin - the GND pin as close as possible. Also, place an approximately 10 µF ceramic capacitor (CIN) between the VIN pin - the GND pin.  Use a 2.2 µH inductor (L) which is having a low equivalent series resistance, having enough tolerable current and which is less likely to cause magnetic saturation.  The MODE pin is controlled with a logic voltage. To make it "H", 1.0 V or more must be forced to the MODE pin. If power supply is less than 1.0 V, MODE pin must be pulled up to VOUT.  When using Forced PWM Control Type, the MODE pin should be “H”.  The RP402x can reset the latch protection circuit by setting the CE signal ‘L’ (VCE < 0.3 V) once while the power is switched on (VIN > 0.8 V). If setting the CE pin when VIN does not reach 0.8 V due to too large CIN, the latch protection circuit cannot be reset correctly. Likewise, if starting the device up when the CE pin is shorted to the VIN pin or VOUT pin, the latch protection circuit cannot be reset.  If controlling the CE pin by input voltage, the gradient of the power supply at rising must be considered. So, the CE pin must be connected via the delay circuit or the voltage detector to become the CE pin voltage less than 0.3 V until the VIN becomes more than 0.8V.  Placing a snubber circuit (Serial connection of CR) in parallel with a diode can reduce the spike noise caused by the Lx pin. The conditions of circuit board has a strong influence on the CR time constant and the efficiency of the converter. The evaluation has to be done using an actual converter (10 Ω and 300 pF). 24 RP402x No. EA-317-180912 PCB Layout Considerations Current Path on PCB Figure 1 and Figure 2 show the current pathways of application circuits when MOSFET is turned ON or when MOSFET is turned OFF, respectively. As shown in Figure 1 and Figure 2, the currents flow in the directions of blue or green arrows. The parasitic components (impedance, inductance or capacitance) formed in the pathways indicated by the red arrows affect the stability of the system and become the cause of noise. Reduce the parasitic components as much as possible. The current pathways should be made by short and thick wirings. Figure 1. MOSFET-ON Figure 2. MOSFET-OFF 25 RP402x No. EA-317-180912 RP402Kxxxx (PKG: DFN(PLP)2020-8pin) Typical Board Layout Top Layer Bottom Layer RP402K00xx (PKG: DFN(PLP)2020-8pin) Typical Board Layout Top Layer Bottom Layer RP402Nxxxx (PKG: SOT-23-5pin) Typical Board Layout Top Layer 26 Bottom Layer RP402x No. EA-317-180912 TYPICAL CHARACTERISTICS Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed. 1) Output Voltage vs. Output Current RP402x181x MODE = "L" ( VFM / PWM ) 1.9 RP402K181x MODE = "H" ( Normal PWM ) (Ta = 25°C) Input Voltage 1.9 1.84 0.8V 1.82 1.8 1.0V 1.78 1.2V 1.76 1.74 1.84 0.8V 1.82 1.8 1.0V 1.78 1.2V 1.76 1.5V 1.72 1.7 1.7 0.1 1 10 100 1000 Output Current IOUT(mA) RP402K182x ( Forced PWM ) 1.9 10000 0.1 1 10 100 1000 Output Current IOUT(mA) 10000 (Ta = 25°C) Input Voltage 1.88 Output Voltage VOUT (V) 0.7V 1.86 1.74 1.5V 1.72 (Ta = 25°C) Input Voltage 1.88 0.7V 1.86 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.88 0.7V 1.86 1.84 0.8V 1.82 1.8 1.0V 1.78 1.2V 1.76 1.74 1.5V 1.72 1.7 0.1 1 10 100 1000 Output Current IOUT(mA) RP402x331x MODE = "L" ( VFM / PWM ) 3.5 10000 0.8V 3.35 1.2V 1.5V 3.3 1.8V 3.25 2.0V 3.2 Output Voltage VOUT (V) 3.4 Input Voltage 0.7V 3.4 0.8V 3.35 1.2V 3.3 1.5V 1.8V 3.25 2.5V 3.2 3.0V 3.15 3.1 (Ta = 25°C) 3.45 0.7V 3.15 2.0V 2.5V 3.0V 3.1 0.1 1 10 100 1000 Output Current IOUT(mA) RP402K332x ( Forced PWM ) 3.5 Output Voltage VOUT (V) 3.5 Input Voltage 3.45 Output Voltage VOUT (V) RP402K331x MODE = "H" ( Normal PWM ) (Ta = 25°C) 10000 0.1 1 10 100 1000 Output Current IOUT(mA) 10000 (Ta = 25°C) Input Voltage 3.45 0.7V 3.4 0.8V 3.35 1.2V 1.5V 3.3 1.8V 3.25 2.0V 3.2 2.5V 3.15 3.0V 3.1 0.1 1 10 100 1000 Output Current IOUT(mA) 10000 27 RP402x No. EA-317-180912 RP402x501x MODE = "L" ( VFM / PWM ) RP402K501x MODE = "H" ( Normal PWM ) (Ta = 25°C) 5.2 Input Voltage 5.15 0.8V 5.1 1.2V 5.05 1.8V 2.4V 5 2.7V 4.95 3.2V 4.9 Output Voltage VOUT (V) Output Voltage VOUT (V) 5.2 3.7V 4.85 Input Voltage 5.15 0.8V 5.1 1.2V 5.05 1.8V 2.4V 5 2.7V 4.95 3.2V 4.9 3.7V 4.85 4.2V 4.8 4.2V 4.8 0.1 1 10 100 1000 Output Current IOUT(mA) RP402K502x ( Forced PWM ) 5.2 Output Voltage VOUT (V) (Ta = 25°C) 10000 0.1 1 10 100 1000 Output Current IOUT(mA) 10000 (Ta = 25°C) Input Voltage 5.15 0.8V 5.1 1.2V 5.05 1.8V 2.4V 5 2.7V 4.95 3.2V 4.9 3.7V 4.85 4.2V 4.8 0.1 1 10 100 1000 Output Current IOUT(mA) RP402x551x MODE = "L" ( VFM / PWM ) (Ta = 25°C) 0.8V 5.7 1.2V 1.8V 5.6 2.4V 5.5 2.7V 3.2V 5.4 3.7V 4.2V 5.3 4.8V 0.1 1 10 100 1000 Output Current IOUT(mA) RP402K552x ( Forced PWM ) 5.8 Output Voltage VOUT (V) Input Voltage 0.8V 5.7 1.2V 1.8V 5.6 2.4V 5.5 2.7V 3.2V 5.4 3.7V 4.2V 5.3 4.8V 5.2 5.2 0.1 10000 (Ta = 25°C) Input Voltage 0.8V 5.7 1.2V 5.6 1.8V 2.4V 5.5 2.7V 3.2V 5.4 3.7V 4.2V 5.3 4.8V 5.2 0.1 28 RP402K551x MODE = "H" ( Nomal PWM ) (Ta = 25°C) 5.8 Input Voltage Output Voltage VOUT (V) Output Voltage VOUT (V) 5.8 10000 1 10 100 1000 Output Current IOUT(mA) 10000 1 10 100 1000 Output Current IOUT(mA) 10000 RP402x No. EA-317-180912 Efficiency vs. Output Current RP402x181x MODE = "L" ( VFM / PWM ) 100 RP402K181x MODE = "H" ( Normal PWM ) (Ta = 25°C) 100 Input Voltage 0.7V 70 0.8V 60 50 1.0V 40 0.8V 60 50 1.0V 40 1.2V 20 20 1.5V 10 0 0.01 0.7V 70 30 1.2V 30 Input Voltage 80 Efficiency η(%) Efficiency η(%) 80 (Ta = 25°C) 90 90 0.1 1 10 100 Output Current IOUT(mA) RP402K182x ( Forced PWM ) 100 1.5V 10 0 0.01 1000 0.1 1 10 100 Output Current IOUT(mA) 1000 (Ta = 25°C) Input Voltage 90 0.7V Efficiency η(%) 80 70 60 0.8V 50 40 1.0V 30 20 1.2V 10 0.1 1 10 100 Output Current IOUT(mA) RP402x331x MODE = "L" ( VFM / PWM ) 100 1000 100 Input Voltage 90 0.8V 70 1.2V 60 1.5V 50 (Ta = 25°C) Input Voltage 90 0.7V 80 Efficiency η(%) RP402K331x MODE = "H" ( Normal PWM ) (Ta = 25°C) 0.7V 80 Efficiency η(%) 0 0.01 0.8V 70 1.2V 60 1.5V 50 40 1.8V 40 1.8V 30 2.0V 30 2.0V 20 2.5V 20 2.5V 10 3.0V 10 3.0V 0 0.01 0.1 1 10 100 Output Current IOUT(mA) RP402K332x ( Forced PWM ) 100 0 0.01 1000 1 10 100 Output Current IOUT(mA) 1000 Input Voltage 0.7V 80 0.8V 70 60 1.2V 50 1.5V 40 1.8V 30 20 2.0V 10 2.5V 0 0.01 0.1 (Ta = 25°C) 90 Efficiency η(%) 2) 0.1 1 10 100 Output Current IOUT(mA) 1000 29 RP402x No. EA-317-180912 RP402x501x MODE = "L" ( VFM / PWM ) 100 2.4V 50 40 2.7V 30 1.2V 70 1.8V 60 2.4V 50 2.7V 3.2V 30 3.2V 20 3.7V 20 3.7V 10 4.2V 10 0.1 1 10 100 Output Current IOUT(mA) RP402K502x ( Forced PWM ) 100 0 0.01 1000 1 10 100 Output Current IOUT(mA) 1000 Input Voltage 0.8V 80 1.2V 70 1.8V 60 2.4V 50 40 2.7V 30 3.2V 20 3.7V 10 4.2V 0 0.01 4.2V 0.1 (Ta = 25°C) 90 Efficiency η(%) 0.8V 40 0 0.01 0.1 1 10 100 Output Current IOUT(mA) RP402x551x MODE = "L" ( VFM / PWM ) 100 1000 RP402K551x MODE = "H" ( Normal PWM ) (Ta = 25°C) 100 Input Voltage (Ta = 25°C) Input Voltage 0.8V 90 0.8V 80 1.2V 80 1.2V 70 1.8V 70 1.8V 60 2.4V 60 2.4V 50 2.7V 50 2.7V 40 3.2V 40 3.2V 30 3.7V 30 3.7V 20 4.2V 20 4.2V 10 4.8V 10 4.8V 90 Efficiency η(%) Efficiency η(%) 60 0 0.01 0.1 1 10 100 Output Current IOUT(mA) RP402K552x ( Forced PWM ) 100 (Ta = 25°C) Input Voltage 0.8V 80 1.2V 70 1.8V 60 2.4V 50 2.7V 40 3.2V 30 3.7V 20 4.2V 10 0 0.01 0 0.01 1000 90 0.1 1 10 100 Output Current IOUT(mA) 1000 Efficiency η(%) Efficiency η(%) 1.8V Input Voltage 80 1.2V 70 (Ta = 25°C) 90 0.8V 80 Efficiency η(%) 100 Input Voltage 90 30 RP402K501x MODE = "H" ( Normal PWM ) (Ta = 25°C) 0.1 1 10 100 Output Current IOUT(mA) 1000 RP402x No. EA-317-180912 3) Standby Current vs. Ambient Temperature RP402x33xA/B/E/F RP402x33xC/D/G/H VIN = 4.8V / VOUT = OPEN 5.0 4.5 4.5 4.0 4.0 Standby Current [µA] Standby Current [µA] VIN = 4.8V / VOUT = GND 5.0 3.5 3.0 2.5 2.0 1.5 3.0 2.5 2.0 1.5 1.0 1.0 0.5 0.5 0.0 0.0 -50 -25 0 25 50 75 -50 100 -25 0 25 50 75 100 Ta [°C] Ta [°C] 4) 3.5 Supply Current 1 vs. Ambient Temperature RP402x33xx VIN = VSET - 0.4V / VOUT = 0.95 × VSET 5.0 4.5 4.0 IDD1 [mA] 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -25 0 25 50 75 100 Ta [°C] 5) Supply Current 2 vs. Ambient Temperature RP402x331x VIN = VSET - 0.4V / VOUT = VSET + 0.2V 30 25 IDD2 [µA] 20 15 10 5 0 -50 -25 0 25 50 75 100 Ta [°C] Start-up vs. Ambient Temperature RP402x33xx ( RL = 5.5kΩ ) 0.8 Start-up Voltage [V] 6) 0.75 0.7 0.65 0.6 -50 -25 0 25 50 75 100 Ta [°C] 31 RP402x No. EA-317-180912 7) Hold-on Voltage vs. Ambient Temperature RP402x33xx ( RL = 5.5kΩ ) 0.41 Hold-on Voltage [V] 0.39 0.37 0.35 0.33 0.31 0.29 0.27 0.25 -50 -25 0 25 50 75 100 Ta [°C] 8) Oscillator Frequency vs. Ambient Temperature RP402K331x MODE = "H" ( Normal PWM ) VIN = 1.5V 1400 1200 1350 1150 1100 1250 fosc [Hz] fosc [Hz] 1300 1200 1150 850 800 -25 0 25 50 75 100 RP402x33xx 100 90 80 Max duty [%] 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 Ta [°C] 10) Lx Current Limit vs. Duty RP402xxxxx (Ta = 25°C) 2500 2300 RP402K001x (5.0V) 2100 RP402K001x (3.3V) 1900 RP402K001x (2.9V) 1700 RP402K001x (2.5V) 1500 RP402K001x (2.3V) 1300 RP402K001x (2.0V) 1100 RP402K001x (1.8V) 900 700 500 30 40 50 60 70 -50 -25 0 25 Ta [°C] Maxduty vs. Ambient Temperature Lxpeak [mA] 950 900 Ta [°C] 80 90 Duty [%] 11) Lx Current Limit vs. Ambient Temperature 32 1000 1050 -50 20 1050 1100 1000 9) RP402K332x ( Forced PWM ) VIN = 1.5V 50 75 100 RP402x No. EA-317-180912 RP402x33xx VIN = 1.65V 2500 2300 2100 Lxpeak [mA] 1900 1700 1500 1300 1100 900 700 500 -50 -25 0 25 50 75 100 Ta [°C] 12) CE ”H” Input Voltage vs. Ambient Temperature RP402xxxxx 0.8 0.7 VCEH [V] 0.6 0.5 0.4 0.3 0.2 -50 -25 0 25 50 75 100 Ta [°C] 13) MODE ”H” Input Voltage vs. Ambient Temperature RP402Kxxxx 1.0 VMODEH [V] 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 Ta [°C] 14) Output Voltage vs. Ambient Temperature RP402x33xx VIN = 1.5V 3.40 Output Voltage VOUT [V] 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.20 -50 -25 0 25 50 75 100 Ta [°C] 33 RP402x No. EA-317-180912 15) Feedback Voltage vs. Ambient Temperature RP402K00xx (VSET = 5.0V) VIN = 3.0V 1.03 Feedback Voltage VFB [V] 1.02 1.01 1.00 0.99 0.98 0.97 -50 -25 0 25 50 75 100 Ta [°C] 16) Start-up Waveform (COUT = 20 μF) RP402K331A RP402K331A (Ta = 25°C) VIN = 1.2V / IOUT = 1mA) Output Voltage 4 3 1.5 1 0.5 CE Input Voltage 2 Output Voltage VOUT / CE Input Voltage [V] 0 Inductor Current ILX [A] Output Voltage VOUT / CE Input Voltage [V] 1 Inductor Current Output Voltage 3 CE Input Voltage 2 (Ta = 25°C) VIN = 1.8V / IOUT = 1mA) 1 0 1.5 1 Inductor Current 0.5 0 0 -0.5 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 Inductor Current ILX [A] 4 -0.5 4.5 -0.5 0 0.5 Time t [ms] 1 1.5 2 Time t [ms] 17) Load Transient Response (COUT = 20 μF) RP402x181x MODE = "L" (VFM / PWM) VIN = 0.9V 1.7 Output Current 1mA 50mA 50 20 40 60 80 Time t [μs] 1.7 Output Current 50mA 1mA 50 0 (Ta = 25°C) 0 0.5 VIN = 0.9V 1 1.5 2 2.5 Time t [ms] 3 3.5 RP402K181x MODE = "H" (Normal PWM) 4 4.5 (Ta = 25°C) 1.9 Output Voltage 1.7 Output Current 1mA 50mA 50 -40 -20 0 20 40 60 80 Time t [μs] 0 100 120 140 160 Output Voltage VOUT [V] 1.75 Output Current IOUT [mA] 1.85 1.8 Output Voltage 1.8 1.75 1.7 Output Current 50mA 1mA 50 0 -0.5 0 0.5 1 1.5 2 2.5 Time t [ms] 3 3.5 4 4.5 Output Current IOUT [mA] 1.85 Output Voltage VOUT [V] 1.75 -0.5 1.9 34 1.8 0 100 120 140 160 RP402K181x MODE = "H" (Normal PWM) VIN = 0.9V Output Voltage VOUT [V] 1.75 0 Output Voltage 1.85 1.8 Output Current IOUT [mA] Output Voltage VOUT [V] 1.85 -20 (Ta = 25°C) 1.9 Output Voltage -40 RP402x181x MODE = "L" (VFM / PWM) Output Current IOUT [mA] 1.9 VIN = 0.9V (Ta = 25°C) RP402x No. EA-317-180912 RP402K182x (Forced PWM) VIN = 0.9V Output Current 1mA 50mA 50 0 20 40 60 80 Time t [μs] Output Current 50mA 1mA 50 -40 (Ta = 25°C) -20 0 20 40 60 80 Time t [ms] 0 100 120 140 160 RP402x331x MODE = "L" (VFM / PWM) VIN = 1.8V (Ta = 25°C) 3.2 3.1 Output Current 1mA 200mA 200 -20 0 20 40 60 80 Time t [μs] 0 100 120 140 160 RP402K331x MODE = "H" (Normal PWM) VIN = 1.8V Output Voltage 3.4 3.3 3.2 3.1 Output Current 200mA 1mA 200 Output Current IOUT [mA] 3.3 Output Voltage VOUT [V] 3.5 Output Voltage 3.4 -40 0 -0.5 (Ta = 25°C) 0 0.5 1 1.5 2 2.5 Time t [ms] 3 3.5 4 RP402K331x MODE = "H" (Normal PWM) VIN = 1.8V 3.6 4.5 (Ta = 25°C) Output Current IOUT [mA] 3.3 3.2 3.1 Output Current 1mA 200mA 200 -40 -20 0 20 40 60 80 Time t [μs] RP402K332x (Forced PWM) VIN = 1.8V Output Voltage VOUT [V] 3.5 Output Voltage 3.4 0 100 120 140 160 Output Voltage 3.4 3.3 3.2 3.1 Output Current 200mA 1mA 200 Output Current IOUT [mA] 3.6 3.5 0 -0.5 (Ta = 25°C) 0 0.5 1 1.5 2 2.5 Time t [ms] RP402K332x (Forced PWM) VIN = 1.8V 3 3.5 4 4.5 (Ta = 25°C) 3.6 3.6 3.5 3.3 3.2 3.1 Output Current 1mA 200mA 200 -40 -20 0 20 40 60 80 Time t [μs] 0 100 120 140 160 Output Current IOUT [mA] Output Voltage 3.4 Output Voltage VOUT [V] 3.5 Output Voltage 3.4 3.3 3.2 3.1 Output Current 200mA 1mA 200 -40 -20 0 20 40 60 80 Time t [ms] Output Current IOUT [mA] Output Voltage VOUT [V] 1.7 3.6 3.5 Output Voltage VOUT [V] 1.75 0 100 120 140 160 RP402x331x MODE = "L" (VFM / PWM) VIN = 1.8V Output Voltage 1.8 Output Current IOUT [mA] 1.7 Output Voltage VOUT [V] Output Current IOUT [mA] 1.75 3.6 Output Voltage VOUT [V] 1.85 Output Voltage 1.8 Output Current IOUT [mA] Output Voltage VOUT [V] 1.85 -20 (Ta = 25°C) 1.9 1.9 -40 RP402K182x (Forced PWM) VIN = 0.9V (Ta = 25°C) 0 100 120 140 160 35 RP402x No. EA-317-180912 Output Current 1mA 250mA 250 RP402K501x MODE = "H" (Normal PWM) VIN = 3.7V (Ta = 25°C) 4.9 4.85 Output Current 1mA 250mA 250 RP402K502x (Forced PWM) VIN = 3.7V 250 0 0.5 1 1.5 2 2.5 Time t [ms] 3 3.5 4 RP402K501x MODE = "H" (Normal PWM) VIN = 3.7V 4.5 (Ta = 25°C) 5.1 Output Voltage 5.05 5 4.95 4.9 Output Current 250mA 1mA 4.85 250 0 100 120 140 160 40 60 80 Time t [μs] Output Current 250mA 1mA 0 -0.5 0 0.5 1 3 3.5 4 RP402K502x (Forced PWM) VIN = 3.7V (Ta = 25°C) 1.5 2 2.5 Time t [ms] 4.5 (Ta = 25°C) 5.2 5.15 5.05 Output Voltage 5 4.95 4.9 4.85 Output Current 1mA 250mA 250 -40 -20 0 20 40 60 80 Time t [μs] 0 100 120 140 160 Output Voltage 5.1 5.05 5 4.95 4.9 Output Current 250mA 1mA 4.85 250 -40 -20 0 20 40 60 80 Time t [μs] Output Current IOUT [mA] 5.1 20 4.9 4.85 5.15 4.95 0 5 4.95 5.2 Output Voltage -20 5.05 0 5 -40 Output Voltage -0.5 Output Voltage VOUT [V] Output Voltage VOUT [V] 5.05 (Ta = 25°C) 5.1 0 100 120 140 160 40 60 80 Time t [μs] Output Voltage VOUT [V] 20 Output Current IOUT [mA] 5.1 0 Output Voltage VOUT [V] 4.85 Output Current IOUT [mA] 4.9 Output Current IOUT [mA] Output Voltage VOUT [V] 4.95 -20 RP402K501x MODE = "L" (VFM / PWM) 5.15 5 -40 VIN = 3.7V 5.2 Output Voltage 5.05 Output Voltage VOUT [V] (Ta = 25°C) Output Current IOUT [mA] 5.1 RP402K501x MODE = "L" (VFM / PWM) Output Current IOUT [mA] VIN = 3.7V 0 100 120 140 160 18) Output Voltage Waveform (COUT = 20 μF) 3.34 Output Voltage 3.35 3.3 LX Voltage 3.25 4 2 0 Output Voltage VOUT [V] VIN = 1.5V / IOUT = 1mA LX Voltage VLX [V] Output Voltage VOUT [V] 3.4 RP402x331x MODE = "L" (VFM / PWM ) (Ta = 25°C) VIN = 1.5V / IOUT = 100mA (Ta = 25°C) Output Voltage 3.32 3.3 LX Voltage 3.28 4 2 0 -2 -2 0 1 2 3 Time t [ms] 36 4 5 0 1 2 Time t [μs] 3 4 5 LX Voltage VLX [V] RP402x331x MODE = "L" (VFM / PWM ) RP402x No. EA-317-180912 RP402K331x MODE = "H" (Normal PWM ) 3.34 Output Voltage 3.35 3.3 LX Voltage 3.25 4 2 Output Voltage VOUT [V] VIN = 1.5V / IOUT = 1mA (Ta = 25°C) LX Voltage VLX [V] VIN = 1.5V / IOUT = 100mA (Ta = 25°C) Output Voltage 3.32 3.3 LX Voltage 3.28 4 2 0 0 -2 -2 0 1 2 3 4 0 5 1 RP402K332x (Forced PWM ) 4 RP402K332x (Forced PWM ) (Ta = 25°C) 3.34 VIN = 1.5V / IOUT = 1mA VIN = 1.5V / IOUT = 100mA 3.3 LX Voltage 3.25 4 2 0 Output Voltage VOUT [V] Output Voltage 3.35 LX Voltage VLX [V] Output Voltage VOUT [V] 3 5 Time t [μs] Time t [μs] 3.4 2 (Ta = 25°C) Output Voltage 3.32 3.3 LX Voltage 3.28 4 2 0 -2 0 1 2 3 4 LX Voltage VLX [V] Output Voltage VOUT [V] 3.4 LX Voltage VLX [V] RP402K331x MODE = "H" (Normal PWM ) -2 5 0 Time t [μs] 1 2 3 4 5 Time t [μs] 19) Mode Switching Waveform RP402K331x ( Ta = 25°C ) VIN = 1.5V / IOUT = 1mA Output Voltage VOUT [V] 2 0 MODE Input Voltage 3.4 3.35 3.3 MODE Input Voltage [V] 4 Output Voltage 3.25 3.2 -2 -1 0 1 2 3 4 Time t [ms] 5 6 7 8 20) Bypass Switch ON Resistance RP402xxxxC/D/G/H 300.0 (Ta= 25°C) Vin=2 V 250.0 Vin=3. 2V RONB [Ω] 200.0 150.0 100.0 50.0 0.0 0 2 4 6 VOUT [V] 37 RP402x No. EA-317-180912 21) PWM Operable Maximum Input Voltage vs. Ambient Temperature RP402Kxx2x: (Forced PWM) RP402Kxx1x: MODE = "H" (Normal PWM) RP402K50xx RP402K50xx ( IOUT = 10mA) ( IOUT = 1mA) 5 5 4.5 4.5 Input Voltage @ PWM [V] Input Voltage @ PWM [V] 4 3.5 3 2.5 2 1.5 1 RP402K502x RP402K501x 0.5 4 3.5 3 2.5 2 1.5 1 RP402K502x RP402K501x 0.5 0 0 -50 -25 0 25 Ta [°C] 50 75 100 -50 -25 0 25 Ta [°C] 50 75 100 75 100 RP402K50xx ( IOUT = 100mA) 5 Input Voltage @ PWM [V] 4.5 4 3.5 3 2.5 2 1.5 1 RP402K502x 0.5 RP402K501x 0 -50 -25 0 25 Ta [°C] 50 75 100 22) Reverse Current at VIN = 0 vs. Ambient Temperature RP402xxxxx VIN = 0V / VOUT = 5.5V 0.2 0.0 IINZERO [µA] -0.2 -0.4 -0.6 -0.8 -1.0 -50 -25 0 25 50 75 100 Ta [°C] 23) Latch Protection Delay Time vs. Ambient Temperature RP402xxx2A/C/E/G RP402xxx1A/C/E/G VIN = 4.5V 4.0 4.8 3.8 4.6 3.6 4.4 tPROT [ms] tPROT [ms] VIN = 4.5V 3.4 4.0 3.0 3.8 3.6 2.8 -50 -25 0 25 Ta [°C] 38 4.2 3.2 50 75 100 -50 -25 0 25 Ta [°C] 50 POWER DISSIPATION DFN(PLP)2020-8 Ver. A The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following measurement conditions are based on JEDEC STD. 51-7. Measurement Conditions Item Measurement Conditions Environment Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass Cloth Epoxy Plastic (Four-Layer Board) Board Dimensions 76.2 mm × 114.3 mm × 0.8 mm Copper Ratio Outer Layer (First Layer): Less than 95% of 50 mm Square Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square Through-holes  0.3 mm × 23 pcs Measurement Result (Ta = 25°C, Tjmax = 125°C) Item Measurement Result Power Dissipation 1800 mW Thermal Resistance (ja) ja = 53°C/W Thermal Characterization Parameter (ψjt) ψjt = 27°C/W ja: Junction-to-Ambient Thermal Resistance ψjt: Junction-to-Top Thermal Characterization Parameter 2000 1800 1800 Power Dissipation (mW) 1600 1400 1200 1000 800 600 400 200 0 0 25 50 75 85 Ambient Temperature (°C) 100 125 Power Dissipation vs. Ambient Temperature Measurement Board Pattern i PACKAGE DIMENSIONS DFN (PLP) 2020-8 Ver. B * * DFN (PLP) 2020-8 Package Dimensions ∗ The tab on the bottom of the package shown by blue circle is a substrate potential (GND). It is recommended that this tab be connected to the ground plane on the board but it is possible to leave the tab floating. i POWER DISSIPATION SOT-23-5 Ver. A The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following measurement conditions are based on JEDEC STD. 51-7. Measurement Conditions Item Measurement Conditions Environment Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass Cloth Epoxy Plastic (Four-Layer Board) Board Dimensions 76.2 mm × 114.3 mm × 0.8 mm Copper Ratio Outer Layer (First Layer): Less than 95% of 50 mm Square Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square Through-holes  0.3 mm × 7 pcs Measurement Result Item (Ta = 25°C, Tjmax = 125°C) Measurement Result Power Dissipation 660 mW Thermal Resistance (ja) ja = 150°C/W Thermal Characterization Parameter (ψjt) ψjt = 51°C/W ja: Junction-to-Ambient Thermal Resistance ψjt: Junction-to-Top Thermal Characterization Parameter Power Dissipation vs. Ambient Temperature Measurement Board Pattern i SOT-23-5 PACKAGE DIMENSIONS Ver. A 2.9±0.2 1.1±0.1 1.9±0.2 0.8±0.1 (0.95) 4 1 2 0～0.1 0.2min. +0.2 1.6-0.1 5 2.8±0.3 (0.95) 3 0.4±0.1 +0.1 0.15-0.05 SOT-23-5 Package Dimensions i 1. 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