User's Manual

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ELECTRONIC DEVICES DIVISION

PWM STEP-UP DC/DC CONVERTER

RH5RH××1A/××2B/××3B SERIES

APPLICATION MANUAL

NO.EA-023-9803

Summary of content (34 pages)

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PWM STEP-UP DC/DC CONVERTER RH5RH ×× 1A/ ××2B/ ××3B SERIES APPLICATION MANUAL ELECTRONIC DEVICES DIVISION NO.
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NOTICE 1. The products and the product specifications described in this application manual are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. This application manual may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3.
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RH5RH SERIES APPLICATION MANUAL CONTENTS OUTLINE ......................................................................................................1 FEATURES....................................................................................................1 APPLICATIONS .............................................................................................1 BLOCK DIAGRAM .........................................................................................2 SELECTION GUIDE ...................
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TYPICAL APPLICATIONS ............................................................................23 • RH5RH ×× 1A .................................................................................................23 • RH5RH ×× 2B..................................................................................................23 • RH5RH ×× 3B..................................................................................................24 • CE pin Drive Circuit ...............................................
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PWM STEP-UP DC/DC CONVERTER RH5RH ×× 1A/ ×× 2B/ ×× 3B SERIES OUTLINE The RH5RH ×× 1A/ ×× 2B/ ×× 3B Series are PWM Step-up DC/DC converter ICs by CMOS process. The RH5RH ×× 1A IC consists of an oscillator, a PWM control circuit, a driver transistor (Lx switch), a reference voltage unit, an error amplifier, a phase compensation circuit, resistors for voltage detection, a soft-start circuit, and an Lx switch protection circuit.
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RH5RH BLOCK DIAGRAM VLX limiter Lx Slow start Vref OUT Buffer Vss Phase Comp. LxSW PWM control – + EXT OSC Error Amp. Chip Enable CE Error Amp. (Error Amplifier) has a DC gain of 80dB, and Phase Comp. (Phase Compensation Circuit) provides the frequency characteristics including the 1st pole (fp=0.25Hz) and the zero point (fz=2.5kHz). Furthermore, another zero point (fz=1.0kHz) is also obtained by the resistors and a capacitor connected to the OUT pin. (Note) Lx Pin ............
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RH5RH PIN CONFIGURATION • SOT-89 • SOT-89-5 5 (mark side) 1 2 4 (mark side) 3 1 2 3 PIN DESCRIPTION Pin No. Symbol Description ×× 1B ×× 2B ×× 3B 1 1 5 VSS Ground Pin 2 2 2 OUT Step-up Output Pin, Power Supply (for device itself) 3 — 4 Lx — 3 3 EXT — — 1 CE Switching Pin (Nch Open Drain) External Tr.
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RH5RH ABSOLUTE MAXIMUM RATINGS Symbol Rating Unit Output Pin Voltage +12 V VLX Lx Pin Voltage +12 V Note1 VEXT EXT Pin Voltage – 0.3 to VOUT+0.3 V Note2 VCE CE Pin Voltage –0.3 to VOUT+0.
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RH5RH ELECTRICAL CHARACTERISTICS • RH5RH301A VOUT=3.0V Symbol VOUT Item Conditions Output Voltage VIN MIN. TYP. MAX. Unit 2.925 3.000 3.075 V 8 V 0.9 V Input Voltage Vstart Start-up Voltage IOUT=1mA,VIN : 0→2V Vhold Hold-on Voltage IOUT=1mA,VIN : 2→0V IDD1 Supply Current 1 0.8 0.7 To be measured at OUT Pin (excluding Switching Current) Note V 15 25 µA 2 5 µA To be measured at OUT Pin IDD2 Supply Current 2 (excluding Switching Current) VIN=3.
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RH5RH • RH5RH501A VOUT=5.0V Symbol VOUT Item Conditions Output Voltage VIN MIN. TYP. MAX. Unit 4.875 5.000 5.125 V 8 V 0.9 V Input Voltage Vstart Start-up Voltage Iout=1mA,Vin:0→2V Vhold Hold-on Voltage Iout=1mA,Vin:2→0V IDD1 Supply Current 1 0.8 0.7 To be measured at OUT Pin (excluding Switching Current) Note V 30 45 µA 2 5 µA To be measured at OUT Pin IDD2 Supply Current 2 (excluding Switching Current) VIN=5.
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RH5RH • RH5RH302B VOUT=3.0V Symbol VOUT VIN Vstart Item Conditions Output Voltage MIN. TYP. MAX. Unit 2.925 3.000 3.075 V 8 V Input Voltage Oscillator Start-up Voltage EXT no load,VOUT :0→2V 0.7 0.8 V IDD1 Supply Current 1 EXT no load,VOUT=2.88V 30 50 µA IDD2 Supply Current 2 EXT no load,VOUT=3.5V 2 5 µA IEXTH EXT “H” Output Current VEXT=VOUT–0.4V –1.5 mA IEXTL EXT “L” Output Current VEXT=0.4V 1.
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RH5RH • RH5RH303B VOUT=3.0V Symbol VOUT Item Conditions Output Voltage VIN MIN. TYP. MAX. Unit 2.925 3.000 3.075 V 8 V 0.9 V Input Voltage Vstart Start-up Voltage IOUT=1mA,VIN : 0→2V Vhold Hold-on Voltage IOUT=1mA,VIN : 2→0V η Efficiency 0.8 0.7 70 V 85 % IDD1 Supply Current 1 To be measured at OUT pin 30 50 µA IDD2 Supply Current 2 To be measured at OUT pin VIN=3.5V 2 5 µA ILX Lx Switching Current VLX=0.4V 60 mA ILXleak Lx Leakage Current VLX=6V,VIN=3.
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RH5RH • RH5RH503B VOUT=5.0V Symbol VOUT Item Conditions Output Voltage VIN MIN. TYP. MAX. Unit 4.875 5.000 5.125 V 8 V 0.9 V Input Voltage Vstart Start-up Voltage IOUT=1mA,VIN : 0→2V Vhold Hold-on Voltage IOUT=1mA,VIN : 2→0V η Efficiency 0.8 0.7 70 V 85 % IDD1 Supply Current 1 To be measured at OUT pin 60 90 µA IDD2 Supply Current 2 To be measured at OUT pin VIN=5.5V 2 5 µA ILX Lx Switching Current VLX=0.4V 80 mA ILXleak Lx Leakage Current VLX=6V,VIN=5.
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RH5RH OPERATION OF STEP-UP DC/DC CONVERTER Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is on, and discharges the energy with the addition of the energy from Input Power Source thereto, so that a higher output voltage than the input voltage is obtained.
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RH5RH When the output current (IOUT) is relatively small, topen0).
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RH5RH Therefore it is necessary that the setting of the input/output conditions and the selection of peripheral components should be made with ILmax taken into consideration. • Output Current in Continuous Conduction Mode When the operation enters into the continuous conduction mode by increasing the IOUT, ILmin becomes equal to Iconst (> 0), and this current always flows through the inductor. Therefore, VIN · Iconst is added to PIN in Equation 5.
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RH5RH TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current Output Voltage VOUT(V) 3.0 2.9 2.8 2.7 1.5V RH5RH301A L=120µH 3.1 Output Voltage VOUT(V) RH5RH301A 3.1 2.0V 2.6 3.0 2.9 2.8 2.7 1.5V 2.6 VIN=1.0V VIN =1.0V 0 20 40 Output Current IOUT(mA) RH5RH501A 5.2 4.8 4.6 3.0V 4.0V 4.4 4.2 4.0 0 VIN= 1.0V 50 100 Output Current IOUT(mA) 10 40 20 30 Output Current IOUT(mA) RH5RH501A L=120µH 5.0 2.0V 0 60 5.2 Output Voltage VOUT(V) Output Voltage VOUT(V) 2.0V 2.5 2.5 4.0V 4.
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RH5RH 2) Efficiency vs. Output Current RH5RH301A Efficiency η (%) Efficiency η (%) 2.0V 70 1.5V 60 VIN=1.0V 50 0 10 20 Output Current IOUT(mA) RH5RH501A VIN=1.0V 1.5V 10 30 20 Output Current IOUT(mA) 40 L=270µH 100 90 Efficiency η (%) Efficiency η (%) 60 RH5RH501A L=120µH 4.0V 80 3.0V 70 2.0V 60 VIN=1.0V 50 80 70 60 4.0V VIN= 1.0V 3.0V 2.
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RH5RH 3) Supply Curret (No Load) vs. Input Voltage RH5RH301A 70 RH5RH301A L=120µH 70 60 Supply Current IIN (µA) Supply Current IIN (µA) 60 50 40 30 20 10 0 1.0 1.2 1.6 1.4 Input Voltage VIN(V) RH5RH501A 1.8 100 50 2 3 Input Voltage VIN(V) 30 20 10 1.2 1.4 1.6 Input Voltage VIN(V) 200 0 1 40 RH5RH501A L=120µH 150 50 0 1.0 2.0 Supply Current IIN (µA) 200 Supply Current IIN (µA) L=270µH 2.0 L=270µH 150 100 50 0 4 1.8 1 2 3 Input Voltage VIN(V) 4 4) Output Current vs.
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RH5RH RH5RH301A Ripple Voltage Vr (mV p-p) Ripple Voltage Vr (mV p-p) 60 50 3.0V 40 VIN=0.9V 2.0V 30 RH5RH501A L=270µH 70 20 10 80 70 60 4.0V 50 3.0V 40 30 2.0V 20 VIN=0.9V 10 0 0 20 30 40 50 60 Output Current IOUT(mA) 10 70 RH5RH302B VIN=0.9V 2.0V 3.0V 50 40 30 20 10 0 1 50 100 150 Output Current IOUT(mA) 20 30 40 50 60 70 Output Current IOUT(mA) 10 RH5RH502B L=28µH 70 60 1 80 120 Ripple Voltage Vr (mV p-p) 1 Ripple Voltage Vr (mV p-p) L=270µH 90 L=28µH 2.
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RH5RH302B L=28µH 1.4 1.2 1.0 Vstart 0.8 0.6 0.4 Vhold 0.2 0 0 20 40 60 80 Output Current IOUT(mA) 100 Start-up/Hold-on Voltage Vstart/Vhold (V) Start-up/Hold-on Voltage Vstart/Vhold (V) RH5RH RH5RH502B L=28µH 1.4 1.2 Vstart 1.0 0.8 0.6 Vhold 0.4 0.2 0 80 20 40 60 Output Current IOUT(mA) 0 100 6) Output Voltage vs.Temperature RH5RH301A 3.1 3.0 2.9 2.8 2.7 –40 –20 0 20 40 60 Temperature Topt(˚C) RH5RH302B 5.2 80 IOUT=10mA VIN=2V L=28µH 3.1 3.0 2.9 2.
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RH5RH 7) Start-up Voltage vs. Temperature 8) Hold-on Voltage vs. Temperature RH5RH501A RH5RH501A 1.0 Hold-on Voltage Vhold(V) Start-up Voltage Vstart(V) 1.2 1.0 0.8 0.6 0.4 0.2 0 –40 –20 40 0 20 Temperature Topt(˚C) 60 0.6 0.4 0.2 0 –40 80 9) Supply Current 1 vs.Temperature 0.
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RH5RH 13) Oscillator Frequency vs.
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RH5RH 100 IOUT=10mA VIN=2V L=28µH 90 80 70 60 50 –40 RH5RH502B Oscillator Duty Cycle Maxdty(%) Oscillator Duty Cycle Maxdty(%) RH5RH302B –20 0 20 40 Temperature Topt(˚C) 60 80 60 80 100 IOUT=10mA VIN=3V L=28µH 90 80 70 60 50 –40 –20 0 20 40 Temperature Topt(˚C) 60 80 15) VLX Voltage Limit vs. Temperature RH5RH501A VLX Voltage Limit VLXlim(V) 1.2 1.0 0.8 0.6 0.4 0.2 0.0 –40 –20 0 20 40 Temperature Topt(˚C) 16) EXT “H” Output Current vs. Temperature 17) EXT “L” Output Current vs.
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RH5RH 18) Load Transient Response RH5RH301A IOUT=1mA-30mA 4.5 210 6.5 210 4.0 180 6.0 180 150 3.0 120 2.5 90 60 2.0 Output Current 30 1.0 0 20 40 60 Time t(ms) Output Voltage 5.5 150 5.0 120 4.5 90 60 4.0 Output Current 3.5 0 80 240 30 3.0 0 20 40 60 Time t(ms) RH5RH502B RH5RH302B IOUT=1mA-30mA 0 80 4.5 210 6.5 210 4.0 180 6.0 180 Output Voltage 3.5 150 3.0 120 2.5 90 2.0 Output Current 1.5 1.
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RH5RH 19) Distribution of Output Voltage Output Voltage VOUT (V) RH5RH501A 5.18~5.20 5.16~5.18 5.14~5.16 5.12~5.14 5.10~5.12 5.08~5.10 5.06~5.08 5.04~5.06 5.02~5.04 5.00~5.02 4.98~5.00 4.96~4.98 4.94~4.96 4.92~4.94 4.90~4.92 4.88~4.90 4.86~4.88 4.84~4.86 4.82~4.84 4.80~4.
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RH5RH TYPICAL APPLICATIONS • RH5RH××1A Diode Inductor VOUT Lx OUT Vss + VIN Capacitor Components Inductor (L) : 120µH (Sumida Electric Co., Ltd.) Diode (D) : MA721 (Matsushita Electronics Corporation, Schottky Type) Capacitor (CL) : 22µF (Tantalum Type) FIG.
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RH5RH • RH5RH ×× 3B Diode Inductor VOUT Lx NC OUT EXT CE Vss + VIN Capacitor Components Inductor (L) : 120µH (Sumida Electric Co., Ltd.) Diode (D) : MA721 (Matsushita Electronics Corporation, Schottky Type) Capacitor (CL) : 22µF (Tantalum Type) FIG.
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RH5RH • CE pin Drive Circuit Diode Inductor RH5RH××3B Lx NC VOUT OUT EXT CE Vss Pull-up resistor + VIN Capacitor CE Tr FIG.
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RH5RH APPLICATION CIRCUITS • 12V Step-up Circuit Inductor Diode VOUT RH5RH502B Cb ZD:6.8V + OUT VIN Capacitor EXT Vss RZD Rb Tr Starter Circuit (Note) When the Output Current is small or the Output Voltage is unstable,use the Rzd for flowing the bias current through the Zener diode ZD. FIG.
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RH5RH • Step-up/Step-down Circuit with Flyback Trance1:1 Diode VOUT RH5RH ××1A OUT Lx VIN + Vss Capacitor Starter Circuit (Note) Use a RH5RH ×× 2B,depend on the Output Current. FIG. 8 *The Starter Circuit is necessary for all above circuits. 1.for Step-up Circuit. Starter Circuit VOUT side VIN side 2.for Step-down and Step-up/Step-down Circuit. VIN side VOUT side RST Tr Starter Circuit ZDST ZDst 2.5V≤/ZDst≤Designation of Output Voltage Rst Input Bias Current of ZDst and Tr.
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RH5RH PACKAGE DIMENSIONS (Unit: mm) • SOT-89 • SOT-89-5 4.5±0.1 4.5±0.1 1.5±0.1 0.4 1.6±0.2 1.5±0.1 1.6±0.2 0.4±0.1 0.42±0.1 0.4±0.1 ø1.0 1 0.9 MIN. 0.4±0.1 3 2 +0.5 –0.3 2.5±0.1 0.4 4.25MAX. 2.5±0.1 3 2 4.5 1 0.8 MIN. ø1.0 4 5 0.4±0.1 0.42 ±0.1 0.47 ±0.1 1.5±0.1 1.5±0.1 0.42 ±0.1 0.42 ±0.1 0.47 ±0.1 1.5±0.1 1.5±0.1 TAPING SPECIFICATIONS (Unit: mm) 4.0±0.1 4.7 5.65±0.05 2.0±0.05 12±0.3 +0.1 ø 1.5 –0 0.3±0.1 1.5±0.1 • SOT-89 5.0 8.0±0.1 2.5MAX.
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RH5RH APPLICATION HINTS When using these ICs, be sure to take care of the following points : • Set external components as close as possible to the IC and minimize the connection between the components and the IC. In particular, when an external component is connected to OUT Pin, make minimum connection with the capacitor. • Make sufficient grounding. A large current flows through Vss Pin by switching.
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RICOH COMPANY, LTD. ELECTRONIC DEVICES DIVISION HEADQUARTERS 13-1, Himemuro-cho, Ikeda City, Osaka 563-8501, JAPAN Phone 81-727-53-1111 Fax 81-727-53-6011 YOKOHAMA OFFICE (International Sales) 3-2-3, Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa 222-8530, JAPAN Phone 81-45-477-1697 Fax 81-45-477-1694·1695 http://www.ricoh.co.jp/LSI/english/ RICOH CORPORATION ELECTRONIC DEVICES DIVISION SAN JOSE OFFICE 3001 Orchard Parkway, San Jose, CA 95134-2088, U.S.A.