Rev.1.2_00 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR S-8353/8354 Series The S-8353/8354 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power MOS FET, an error amplifier, a phase compensation circuit, a PWM controller (S-8353 Series) and a PWM/PFM switching controller (S-8354 Series). Simply attaching a coil, capacitor, and diode externally can configure the step-up switching regulator. In addition to the above features, the small package and low power consumption of this series make it ideal for portable device applications requiring high efficiency. The S-8353 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM controller, which can vary the duty ratio linearly from 0 % to 83 % (from 0 % to 78 % for 250 kHz models), optimally-designed error amplifier, and phase compensation circuits. The S-8354 Series features a PWM/PFM switching controller that can switch the operation to a PFM controller with a duty ratio is 15 % under a light load to prevent a decline in the efficiency due to the IC operating current. Features * Low voltage operation: * Low current consumption: * Duty ratio: * External parts: * Output voltage: * Oscillation frequency: * Soft start function: Start-up is guaranteed from 0.9 V (IOUT=1 mA) During operation: 18.7 A (3.3 V, 50 kHz, typ.) During shutdown: 0.5 A (max.) Built-in PWM/PFM switching control circuit (S-8354 Series) 15 % to 83 % (30 kHz and 50 kHz models), 15 % to 78 % (250 kHz models) Coil, capacitor, and diode Can be set in 0.1 V steps between 1.5 and 6.5 V (for VDD/VOUT separate types) or 2.0 and 6.5 V (for other than VDD/VOUT separate types). Accuracy of 2.4%. 30 kHz, 50 kHz, and 250 kHz 6 ms (50 kHz, typ.) Applications * * * * Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs Power supplies for audio equipment such as portable CD/MD players Constant voltage power supplies for cameras, video equipment, and communications equipment Power supplies for microcomputers Packages Package name SOT-23-3 SOT-23-5 SOT-89-3 Package MP003-A MP005-A UP003-A Drawing code Tape MP003-A MP005-A UP003-A Seiko Instruments Inc. Reel MP003-A MP005-A UP003-A 1 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Block Diagrams 1. A, C, H type (Without Shutdown Function) VOUT CONT Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit VSS Figure 1 2. A, H type (With Shutdown Function) VOUT CONT Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit VSS ON / OFF Figure 2 3. D, J type CONT VDD VOUT Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit Figure 3 2 Seiko Instruments Inc. VSS ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Product Name Structure 1. Function List Table 1 Product name Control system Switching Shutdown VDD/VOUT frequency [kHz] function separate type Package Application Application requiring shutdown function Application not requiring shutdown function Application not requiring shutdown function For pager Application in which output voltage is adjusted by external resistance Application requiring shutdown function and thin coil Application not requiring shutdown function and requiring thin coil Application not requiring shutdown function and requiring thin coil Application in which output voltage is adjusted by external resistance and that requires thin coil Application requiring shutdown function Application not requiring shutdown function Application not requiring shutdown function S-8353AxxMC PWM 50 Yes SOT-23-5 S-8353AxxMA PWM 50 SOT-23-3 S-8353AxxUA PWM 50 SOT-89-3 S-8353CxxMA PWM 30 SOT-23-3 S-8353DxxMC PWM 50 Yes SOT-23-5 S-8353HxxMC PWM 250 Yes SOT-23-5 S-8353HxxMA PWM 250 SOT-23-3 S-8353HxxUA PWM 250 SOT-89-3 S-8353JxxMC PWM 250 Yes SOT-23-5 50 Yes SOT-23-5 50 SOT-23-3 50 SOT-89-3 30 SOT-23-3 For pager 50 Yes SOT-23-5 250 Yes SOT-23-5 250 SOT-23-3 250 SOT-89-3 250 Yes SOT-23-5 S-8354AxxMC S-8354AxxMA S-8354AxxUA S-8354CxxMA S-8354DxxMC S-8354HxxMC S-8354HxxMA S-8354HxxUA S-8354JxxMC PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching Seiko Instruments Inc. Application in which output voltage is adjusted by external resistance Application requiring shutdown function and thin coil Application not requiring shutdown function and requiring thin coil Application not requiring shutdown function and requiring thin coil Application in which output voltage is adjusted by external resistance and that requires thin coil 3 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 2. Product Name S-835 x x xx xx - xxx - T2 IC direction in tape specifications *1 *2 Product code Package code MA: SOT-23-3 MC: SOT-23-5 UA: SOT-89-3 Output voltage 15 to 65 (Ex. When the output voltage is 1.5 V, it is expressed as 15.) Product type A: Normal products (SOT23-3, SOT-89-3), or With shutdown function products (SOT-23-5), C: Normal products D: VDD/VOUT separate type, H: Normal products (SOT23-3, SOT-89-3), or With shutdown function products (SOT-23-5), J: VDD/VOUT separate type, Control system 3: PWM control 4: PWM/PFM control *1. Refer to the taping specifications at the end of this book. *2. Refer to the "3. Product Name List". 4 Seiko Instruments Inc. fosc=50 kHz fosc=50 kHz fosc=30 kHz fosc=50 kHz fosc=250 kHz fosc=250 kHz fosc=250 kHz ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series 3. Product Name List 3-1. S-8353 Series Table 2 Output voltage S-8353AxxMC Series S-8353AxxMA Series S-8353AxxUA Series S-8353CxxMA Series 2.0 V S-8353A20MC-IQF-T2 2.5 V S-8353A25MC-IQK-T2 2.7 V S-8353A27MC-IQM-T2 2.8 V S-8353A28MC-IQN-T2 3.0 V S-8353A30MC-IQP-T2 S-8353A30MA-IQP-T2 S-8353C30MA-ISP-T2 3.3 V S-8353A33MC-IQS-T2 S-8353A33MA-IQS-T2 S-8353A33UA-IQS-T2 3.8 V S-8353A38MC-IQX-T2 5.0 V S-8353A50MC-IRJ-T2 S-8353A50MA-IRJ-T2 S-8353A50UA-IRJ-T2 Remark Please contact the SII marketing department for products with an output voltage other than those specified above. Table 3 Output voltage S-8353DxxMC Series S-8353HxxMC Series S-8353JxxMC Series 2.0 V S-8353D20MC-IUF-T2 S-8353J20MC-IYF-T2 2.5 V S-8353J25MC-IYK-T2 3.0 V S-8353D30MC-IUP-T2 S-8353H30MC-IWP-T2 S-8353H31MC-IWQ-T2 3.1 V 3.3 V S-8353H33MC-IWS-T2 3.8 V S-8353H38MC-IWX-T2 4.0 V S-8353H40MC-IWZ-T2 S-8353H45MC-IXE-T2 4.5 V 5.0 V S-8353D50MC-IVJ-T2 S-8353H50MC-IXJ-T2 S-8353J50MC-IZJ-T2 Remark Please contact the SII marketing department for products with an output voltage other than those specified above. 3-2. S-8354 Series Table 4 Output voltage S-8354AxxMC Series S-8354AxxMA Series S-8354AxxUA Series S-8354DxxMC Series S-8354D20MC-JUF-T2 2.0 V 2.7 V S-8354A27MC-JQM-T2 S-8354A27MA-JQM-T2 3.0 V S-8354A30MC-JQP-T2 S-8354A30MA-JQP-T2 S-8354A30UA-JQP-T2 3.3 V S-8354A33MC-JQS-T2 S-8354A33MA-JQS-T2 S-8354A33UA-JQS-T2 4.0 V S-8354A40MC-JQZ-T2 5.0 V S-8354A50MC-JRJ-T2 S-8354A50MA-JRJ-T2 S-8354A50UA-JRJ-T2 Remark Please contact the SII marketing department for products with an output voltage other than those specified above. Table 5 Output voltage S-8354HxxMC Series S-8354JxxMC Series 3.0 V S-8354H30MC-JWP-T2 3.3 V S-8354H33MC-JWS-T2 5.0 V S-8354H50MC-JXJ-T2 S-8354J50MC-JZJ-T2 Remark Please contact the SII marketing department for products with an output voltage other than those specified above. Seiko Instruments Inc. 5 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Pin Configurations SOT-23-3 Top view 1 2 Table 6 Pin No. 1 2 3 Symbol VOUT VSS CONT Pin description Output voltage and IC power supply pin GND pin External inductor connection pin 3 Figure 4 SOT-23-5 Top view 5 1 Pin No. Symbol 1 ON / OFF (A, H type) 4 2 3 Figure 5 SOT-89-3 Top view 1 Table 7 2 Pin description Shutdown pin "H": Normal operation (Step-up operation) "L": Stop step-up (Entire circuit stopped) VOUT Output voltage pin (D, J type) VOUT 2 Output voltage and IC power supply pin (A, H type) VDD IC power supply pin (D, J type) *1 NC 3 No connection 4 VSS GND pin 5 CONT External inductor connection pin *1. The NC pin is electrically open. Table 8 Pin No. 1 2 3 Symbol VSS VOUT CONT Pin description GND pin Output voltage and IC power supply pin External inductor connection pin 3 Figure 6 6 Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Absolute Maximum Ratings Table 9 (Ta=25C unless otherwise specified) Absolute maximum rating Unit V VSS-0.3 to VSS+12 Item VOUT pin voltage Symbol VOUT ON / OFF pin voltage (S-835xAxxMC, S-835xHxxMC) VDD pin voltage (S-835xDxxMC, S-835xJxxMC) CONT pin voltage CONT pin voltage Power dissipation VON / OFF VSS-0.3 to VSS+12 VDD VSS-0.3 to VSS+12 VSS-0.3 to VSS+12 300 mA SOT-23-3 150 mW SOT-23-5 250 SOT-89-3 500 Operating ambient temperature Topr -40 to +85 C Storage ambient temperature Tstg -40 to +125 Caution The absolute maximum ratings are rated values exceeding which the product cloud suffer physical damage. These values must therefore not be exceeded under any conditions. VCONT ICONT PD Seiko Instruments Inc. 7 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Electrical Characteristics 1. 50 kHz Product (A type, D type) Table 10 Item Symbol Condition Output voltage VOUT Input voltage Operation start voltage Oscillation start voltage VIN VST1 VST2 Operation holding voltage VHLD Current consumption 1 ISS1 Current consumption 2 ISS2 Current consumption during shutdown (S-835xAxxMC Series) Switching current IOUT=1 mA No external parts, Voltage applied to VOUT IOUT=1 mA, Measured by decreasing VIN voltage gradually VOUT=VOUT(S)x0.95 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VOUT=VOUT(S)+ 0.5 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 ISSS VON / OFF =0 V ISW VCONT=0.4 V ISWQ Switching transistor leak current Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Maximum Duty ratio PWM/PFM switching duty ratio (S-8354 Series) ON / OFF pin input voltage (S-835xAxxMC Series) ON / OFF pin input current (S-835xAxxMC Series) Soft start time Efficiency 8 (Ta=25C unless otherwise specified) Test Min. Typ. Max. Unit circuit VOUT(S) VOUT(S) VOUT(S) V 2 x0.976 x1.024 10 0.9 0.8 1 0.7 10.8 13.3 18.7 24.7 31.0 37.8 4.8 5.0 5.1 5.3 5.5 5.7 18.0 22.2 31.1 41.1 51.6 63.0 9.5 9.9 10.2 10.6 10.9 11.3 0.5 80 103 125 144 176 200 215 128 165 200 231 282 320 344 mA VCONT=VOUT=10 V 0.5 A VIN=VOUT(S)x0.4 to x0.6 IOUT=10 A to VOUT(S) / 250x1.25 30 30 60 60 mV Ta=-40C ~ +85C 50 VOUT=VOUT(S)x0.95 VOUT=VOUT(S)x0.95 42.5 75 50 83 57.5 90 ppm/ C kHz % 10 15 24 0.75 0.3 VSL2 Measured oscillation at CONT pin Judged the stop When VOUT1.5 V oscillation at CONT When VOUT<1.5 V pin 0.2 ISH ON / OFF pin=VOUT(S)x0.95 -0.1 0.1 A ON / OFF pin=0 V -0.1 3.0 6.0 85 0.1 12.0 ms % VOUT1 VOUT2 VOUT Ta * VOUT fOSC MaxDuty PFMDuty VSH VSL1 ISL tSS EFFI S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VIN=VOUT(S)-0.1 V, No load Seiko Instruments Inc. 2 A 1 2 1 V 2 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series External parts Coil: CDRH6D28-101 of Sumida Corporation Diode: MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd. Capacitor: F93 (16 V, 22 F tantalum type) of Nichicon Corporation VIN=VOUT(S)x0.6 applied, IOUT=VOUT(S) / 250 Shutdown function built-in type (S-835xAxxMC Series): VDD/VOUT separate type (S-835xDxxMC Series): ON / OFF pin is connected to VOUT VDD pin is connected to VOUT pin Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD=0.8 V. However, 1.8 VVDD<10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD1.8 V must be applied for products with a set value of less than 1.9 V.) Seiko Instruments Inc. 9 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 2. 30 kHz Product (C type) Table 11 Item Symbol Condition Output voltage VOUT Input voltage Operation start voltage Oscillation start voltage VIN VST1 VST2 Operation holding voltage VHLD Current consumption 1 ISS1 Current consumption 2 ISS2 Switching current ISW IOUT=1 mA No external parts, Voltage applied to VOuT IOUT=1 mA, Measured by decreasing VIN voltage gradually VOUT=VOUT(S)x0.95 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VOUT=VOUT(S)+ 0.5 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VCONT=0.4 V S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 (Ta=25C unless otherwise specified) Test Min. Typ. Max. Unit circuit VOUT(S) VOUT(S) VOUT(S) V 2 x0.976 x1.024 10 0.9 0.8 1 0.7 52 62 72 88 100 108 9.8 13.1 16.8 20.7 24.8 435 4.7 4.9 5.1 5.2 83 100 115 141 160 172 16.4 21.9 28.0 34.5 41.4 9.0 9.4 9.7 10.1 10.4 0.5 A 30 30 60 60 mV 50 30 83 35 90 ppm/ C kHz % 15 24 6.0 84 12.0 Switching transistor leak VCONT=VOUT=10 V ISWQ current VOUT1 Line regulation VIN=VOUT(S)x0.4 to x0.6 VOUT2 Load regulation IOUT=10 A to VOUT(S) / 250x1.25 OUT V Output voltage Ta=-40C to +85C temperature coefficient Ta * VOUT Oscillation frequency fOSC VOUT=VOUT(S)x0.95 25 Maximum duty ratio MaxDuty VOUT=VOUT(S)x0.95 75 PWM/PFM switching duty 10 PFMDuty VIN=VOUT(S)-0.1 V, No load ratio (S-8354 Series) Soft start time tSS 3.0 Efficiency EFFI External parts Coil: CDRH6D28-101 of Sumida Corporation Diode: MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd. Capacitor: F93 (16 V, 22 F tantalum type) of Nichicon Corporation VIN=VOUT(S)x0.6 applied, IOUT=VOUT(S) / 250 Remarks 1. 10 2 A 1 mA ms % 2 1 2 VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage. Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series 3. 250 kHz Product (H type, J type) Table 12 Item Symbol Condition Output voltage VOUT Input voltage Operation start voltage Oscillation start voltage VIN VST1 VST2 Operation holding voltage VHLD Current consumption 1 ISS1 Current consumption 2 ISS2 Current consumption during shutdown (S-835xHxxMC Series) Switching current IOUT=1 mA No external parts, Voltage applied to VOUT IOUT=1 mA, Measured by decreasing VIN gradually VOUT=VOUT(S)x0.95 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VOUT=VOUT(S)+ 0.5 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 ISSS VON / OFF =0 V ISW VCONT=0.4 V ISWQ Switching transistor leak current Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Maximum duty ratio PWM/PFM switching duty ratio (S-8354 Series) ON / OFF pin input voltage (S-835xHxxMC Series) ON / OFF pin input current (S-835xHxxMC Series) Soft start Efficiency (Ta=25C unless otherwise specified) Test Min. Typ. Max. Unit citcuit VOUT(S) VOUT(S) VOUT(S) V 2 x0.976 x1.024 10 0.9 0.8 1 0.7 36.5 48.3 74.3 103.1 134.1 167.0 9.1 9.3 9.5 9.7 9.8 10.0 60.8 80.5 123.8 171.9 223.5 278.4 18.2 18.6 18.9 19.3 19.6 19.9 0.5 80 103 125 144 176 200 215 128 165 200 231 282 320 344 mA VCONT=VOUT=10 V 0.5 A VIN=VOUT(S)x0.4 to x0.6 IOUT=10 A to VOUT(S) / 250x1.25 30 30 60 60 mV Ta=-40C to +85C 50 212.5 70 250 78 287.5 85 ppm/ C kHz % 10 15 24 0.75 0.3 VSL2 Measured the oscillation at CONT pin When VOUT1.5 V Judged the stop of oscillation at CONT When VOUT<1.5 V pin 0.2 ISH ON / OFF pin=VOUT(S)x0.95 -0.1 0.1 A ON / OFF pin=0 V -0.1 1.8 3.6 85 0.1 7.2 ms % VOUT1 VOUT2 VOUT Ta * VOUT fOSC MaxDuty PFMDuty VSH VSL1 ISL tSS EFFI S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VOUT=VOUT(S)x0.95 VOUT=VOUT(S)x0.95 VIN=VOUT(S)-0.1 V, No load Seiko Instruments Inc. 2 A 1 2 1 V 2 11 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series External parts Coil: CDRH6D28-220 of Sumida Corporation Diode: MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd. Capacitor: F93 (16 V, 22 F tantalum type) of Nichicon Corporation VIN=VOUT(S)x0.6 applied, IOUT=VOUT(S) / 250 Shutdown function built-in type (S-835xHxxMC Series): ON / OFF pin is connected to VOUT VDD pin is connected to VOUT pin VDD/VOUT separate type (S-835xJxxMC Series): Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD=0.8 V. However, 1.8 VVDD<10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD1.8 V must be applied for products with a set value of less than 1.9 V.) 12 Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Test Circuits 1. 300 CONT ON / OFF A VOUT *2 VDD *1 VSS Oscilloscope + 0.1 F - Figure 7 2. + - CONT VOUT *2 VDD *1 ON / OFF VSS + - V 0.1 F Figure 8 *1. *2. Only for S-835xAxxMC Series and S-835xHxxMC Series Only for S-835xDxxMC Series and S-835xJxxMC Series Seiko Instruments Inc. 13 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Operation 1. Step-up DC-DC Converter The S-8353 Series is a DC-DC converter that uses a pulse width modulation method (PWM) and features low current consumption. In the S-8353 Series, the switching frequency does not change, although the pulse width changes from 0 % to 83 % (78 % for H type and J type) corresponding to each load current. The ripple voltage generated from switching can thus be removed easily using a filter because the switching frequency is constant. The S-8354 Series is a DC-DC converter that automatically switches between a pulse width modulation method (PWM) and a pulse frequency modulation method (PFM), depending on the load current, and features low current consumption. The S-8354 Series operates under PWM control with the pulse width duty changing from 15 % to 83 % (78 % for H type and J type) when the output load current is high. On the other hand, when the output current is low, the S-8354 Series operates under PFM control with the pulse width duty fixed at 15 %, and pulses are skipped according to the load current. The oscillator thus oscillates intermittently so that the resultant lower current consumption prevents a reduction in the efficiency when the load current is low. The switching point from PWM control to PFM control depends on the external devices (coil, diode, etc.), input voltage, and output voltage. This series is an especially efficient DC-DC converter at an output current of around 100 A. For this IC, a built-in soft start circuit controls the rush current and overshoot of the output voltage when the power is turned on or the ON / OFF pin is set to "H" level. 2. ON/ OFF Pin (Shutdown Pin) (Only for S-835xAxxMC Series and S-835xHxxMC Series) Stops or starts step-up operation. Setting the ON / OFF pin to "L" level stops operation of all the internal circuits and reduces the current consumption significantly. DO NOT use the ON / OFF pin in a floating state because it has the structure shown in Figure 9 and is not pulled up or pulled down internally. DO NOT apply a voltage of between 0.3 V and 0.75 V to the ON / OFF pin because applying such a voltage increases the current consumption. If the ON / OFF pin is not used, connect it to the VOUT pin. The ON / OFF pin does not have hysteresis. Table 13 ON / OFF pin CR oscillation circuit Outpu voltage "H" Operation Fixed *1 "L" Stop VIN *1. Voltage obtained by extracting the voltage drop due to the DC resistance of the inductor and the diode forward voltage from VIN. VOUT ON / OFF VSS Figure 9 14 ON/ OFF Pin Structure Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series 3. Step-up Switching Regulator Circuit for Basic Equations L D VIN CONT VOUT + M1 VSS Caution - CL The above connection diagram will not guarantees successful operation. through evaluation using the actual application to set the constant. Figure 10 Perform Step-up switching regulator circuit for basic equations The following are the basic equations {(1) through (7)} of the step-up switching regulator. (Refer to Figure 10) *1 Voltage at CONT pin at the moment M1 is turned ON, VA : *2 VA=VS *1. Current (IL) flowing through L is zero *2. Non-saturated voltage of M1 The change in IL over time: dIL VL VIN - VS = = dt L L (1) (2) Integration of equation (2) (IL): VIN - VS IL = *t L (3) IL flows while M1 is ON (tON). The time of tON is determined by the oscillation frequency of OSC. The peak current (IPK) after tON: VIN - VS IPK = (4) * tON L 2 The energy stored in L is represented by 1/2 * L (IPK) . When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor. Then, the reverse voltage (VL) is generated: *1 (5) VL=(VOUT+VD )-VIN *1. Diode forward voltage The voltage at CONT pin rises only by VOUT+VD. The change in the current (IL) flowing through the diode into VOUT during tOFF: dIL VL VOUT + VD - VIN = = dt L L Seiko Instruments Inc. (6) 15 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Integration of equation (6) is as follows: VOUT + VD - VIN IL = IPK - *t L (7) During tON, the energy is stored in L and is not transmitted to VOUT. When receiving the output current (IOUT) from VOUT, the energy of the capacitor (CL) is consumed. As a result, the pin voltage of CL is reduced, and goes to the lowest level after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted through the diode to CL, and the voltage of CL rises rapidly. VOUT is a time function, and therefore indicates the maximum value (ripple voltage: VP-P) when the current flowing through into VOUT and load current (IOUT) match. Next, the ripple voltage is determined as follows: IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level: VOUT + VD - VIN IOUT = IPK - (8) * t1 L L t1 = (IPK - IOUT ) * VOUT + VD - VIN (9) When M1 is turned OFF (tOFF), IL=0 (when the energy of the inductor is completely transmitted): Based on equation (7), L tOFF (10) = VOUT + VD - VIN IPK When substituting equation (10) for equation (9), IOUT t1 = tOFF - * tOFF IPK Electric charge Q1 which is charged in CL during t1: t1 t1 t1 VOUT + VD - VIN VOUT + VD - VIN 1 2 Q1 = * * t1 ILdt = IPK * dt - tdt = IPK * t1 - 0 0 0 L 2 L When substituting equation (12) for equation (9): 1 IPK + IOUT Q1 = IPK - (IPK - IOUT ) * t1 = * t1 2 2 A rise in voltage (VP-P) due to Q 1: Q1 1 IPK + IOUT VP - P = = * * t1 CL CL 2 When taking into consideration IOUT to be consumed during t1 and the ESR (Equivalent Series Resistance) of CL, namely RESR: Q1 1 IPK + IOUT IOUT * t1 IPK + IOUT VP - P = = * * t1 + * RESR - CL CL 2 2 CL When substituting equation (11) for equation (15): (IPK - IOUT )2 tOFF IPK + IOUT VP - P = * + * RESR 2IPK CL 2 (11) (12) (13) (14) (15) (16) Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small ESR. 16 Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series External Parts Selection for DC-DC Converter The relationship between the major characteristics of the step-up circuit and the characteristic parameters of the external parts is shown in Figure 11. For higher efficiency? For larger output current? For smaller ripple voltage? PFM control PWM control Smaller inductance Larger inductance Smaller DC resistance of inductor Larger output capacitance Figure 11 Larger output capacitance Relationship between Major Characteristics of Step-up Circuit and External Parts 1. Inductor The inductance has a strong influence on the maximum output current (IOUT) and efficiency (). The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT increases. If L is made even smaller, the efficiency falls causing a decline in the current drive capacity for the switching transistor, and IOUT decreases. The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a certain L value. Increasing L further decreases the efficiency due to the loss of coil DC resistance. IOUT also decreases. A higher oscillation frequency allows selection of a lower L value, making the coil smaller. The recommended inductances are 47 to 220 H for A, C, and D types, and 10 to 47 H for H and J types. Observe the allowable inductor current when choosing an inductor. Exceeding the allowable current of the inductor causes magnetic saturation, resulting in very low efficiency and destruction of the IC chip due to a large current. Choose an inductor so that IPK does not exceed the allowable current. IPK in con-continuous mode is calculated from the following equation: 2 IOUT ( VOUT + VD - VIN) (17) (A) IPK = fosc * L fosc=oscillation frequency, VD 0.4 V. 2. Diode Use an external diode that meets the following requirements: * Low forward voltage: (VF<0.3 V) * High switching speed: (50 ns max.) * Reverse voltage: VOUT+VF or more * Rated current: IPK or more Seiko Instruments Inc. 17 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 3. Capacitor (CIN, CL) A capacitor on the input side (CIN) improves the efficiency by reducing the power impedance and stabilizing the input current. Select a CIN value according to the impedance of the power supply used. A capacitor on the output side (CL) is used for smoothing the output voltage. For step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. Therefore, select an appropriate capacitor in accordance with the ripple voltage, which increases in the case of a high output voltage or a high load current. The capacitor value should be at least 10 F. Select capacitor with an appropriate ESR (Equivalent Series Resistance) for stable output voltage. The stable range of voltage for this IC depends on the ESR. Although the inductance (L) is also a factor, an ESR of 30 m to 500 m maximizes the characteristics. However, the best ESR value may depend on the value of L, the capacitance, the wiring, and the applications (output load). Therefore, fully evaluate the ESR under the actual operating conditions to determine the best value. Figure 18 of Application Circuits shows an example of a circuit that uses a ceramic capacitor and the external resistance (ESR) for reference. 4. VDD/VOUT Separate Types (Only for D type and J type) The D and J types are ideal for the following applications because the power pin for the IC chip and the VOUT pin for the output voltage are separated. (1) When changing the output voltage with external resistance. (2) When outputting a high voltage within the operating voltage (10 V). Choose the products in the Table 14 according to the applications (1) or (2) above. Table 14 Output voltage VCC S-835xx18 S-835xx50 Connection to VDD pin 1.8 VVCC<5 V Yes VIN or VCC 5 VVCC10 V Yes VIN Cautions 1. This IC starts a step-up operation at VDD=0.8 V, but set 1.8 VDD10 V to stabilize the output voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows connection of the VDD pin to either the input power VIN pin or output power VOUT pin. 2. Choose external resistors RA and RB so as to not affect the output voltage, considering that there is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance between the VOUT pin and VSS pin is as follows: (1) S-835xx18: 2.1 M to 14.8 M (2) S-835xx20: 1.4 M to 14.8 M (3) S-835xx30: 1.4 M to 14.2 M (4) S-835xx50: 1.4 M to 12.1 M 3. Attach a capacitor (CC) in parallel to the RA resistance when an unstable event such as oscillation of the output voltage occurs. Calculate CC using the following equation: 1 CC [F] = 2 * * RA * 20 kHz 18 Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Standard Circuits 1. S-8353AxxMA/UA, S-8353CxxMA, S-8353HxxMA/UA, S-8354AxxMA/UA, S-8354CxxMA, S-8354HxxMA/UA SD L VOUT CONT Oscillation circuit VIN CIN + - PWM control, PWM/PFM switching control circuit Soft start built-in reference power supply Remark IC internal power supply + - CL + - Phase compensating circuit VSS The power supply for the IC chip is from the VOUT pin. Figure 12 2. S-8353AxxMC, S-8353HxxMC, S-8354AxxMC, S-8354HxxMC SD L VOUT CONT Oscillation circuit VIN IC internal power supply PWM control, + PWM/PFM switching control - circuit CIN + - Soft start built-in reference power supply Phase compensating circuit + - CL VSS ON / OFF Remark The power supply for the IC chip is from the VOUT pin. Figure 13 Seiko Instruments Inc. 19 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 3. S-8353DxxMC, S-8353JxxMC, S-8354DxxMC, S-8354JxxMC SD L CONT VDD Oscillation circuit VIN CIN + - PWM control, PWM/PFM switching control circuit Soft start built-in reference power supply Remark IC internal power supply + - Phase compensating circuit CC RA + - CL VOUT VSS RB The power supply for the IC chip is from the VOUT pin. Figure 14 Caution 20 The above connection diagram will not guarantees successful operation. through evaluation using the actual application to set the constant. Seiko Instruments Inc. Perform ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Power Dissipation of Package 600 SOT-89-3 SOT-23-5 400 SOT-23-3 Power dissipation (PD) [mW] 200 0 0 50 100 150 Ambient temperature (Ta) [C] Figure 15 Power Dissipation of Package (Before Mounting) Precautions * Mount external capacitors, diodes, and coils as close as possible to the IC. Especially, mounting the output capacitor (capacitor between VDD pin and VSS pin for VDD/VOUT separate type) in the power supply line of the IC close to the IC can enable stable output characteristics. If it is impossible, it is recommended to mount and wire a ceramic capacitor of around 0.1 F close to the IC. * Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current flows at the time of a power supply injection. Because these largely depend on the coil, the capacitor and impedance of power supply used, fully check them using an actually mounted model. * The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits and external parts. Thoroughly test all settings with your device. The recommended external part should be used wherever possible, but if this is not possible for some reason, contact an SII sales person. * Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit. * SII claims no responsibility for any and all disputes arising out of or in connection with any infringement of the products including this IC upon patents owned a third party. Seiko Instruments Inc. 21 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Application Circuits Example of Ceramic Capacitor Application When using a component with a small ESR, such as a ceramic capacitor, for the output capacitance, mount a resistor (R1) equivalent to the ESR in series with the ceramic capacitor (CL) as shown in Figure 16. R1 differs depending on the L value, capacitance, wiring, and application (output load). The following example shows a circuit using R1=100 m, output voltage=3.3 V, output load=100 mA and its characteristics. L VIN SD VOUT CIN CONT R1 VOUT CL VSS Caution The above connection diagram and constant will not guarantees successful operation. Perform through evaluation using the actual application to set the constant. Figure 16 Circuit Using Ceramic Capacitor Table 15 IC L type name SD type name CL (Ceramic capacitor) R1 S-8353A33 CDRH5D28-101 MA2Z748 10 Fx2 100 m Output Characteristics (a), (b), (c) Ceramic Capacitor Circuit Output Characteristics 1. Output current-Efficiency 2. 80 60 40 V IN=0.9 VIN=1.8 V IN=2.7 20 0 0.01 0.1 1 10 100 Output current-Output voltage Output voltage VOUT [V] Efficiency [%] 100 1000 3.40 3.35 3.30 3.25 3.20 0.01 Output current I OUT [mA] 3. Output current-Ripple voltage Ripple voltage Vr [mV] 140 22 120 100 VIN=0.9 VIN=1.8 VIN=2.7 80 60 40 20 0 0.01 0.1 1 10 100 Output current I OUT [mA] 1000 Seiko Instruments Inc. VIN=0.9 VIN=1.8 VIN=2.7 0.1 1 10 100 Output current IOUT [mA] 1000 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Examples of Major Temperature Characteristics (Ta=- =-40 =- to +85C) 50 ISS1 - Ta (VOUT = 3.3 V, fosc= 50 kHz) 100 40 80 30 ISS1 60 ISS1 [A] 20 [A] 40 10 20 0 -40 10 -20 0 20 40 Ta [C] 60 80 0 -40 100 ISS2 - Ta (VOUT = 3.3 V, fosc= 50 kHz) 10 8 ISS2 ISS2 0 20 40 Ta [C] 60 80 100 ISS2 - Ta (VOUT = 3.3 V, fosc= 250 kHz) 6 [A] 4 [A] 4 2 2 1.0 -20 8 6 0 -40 ISS1 - Ta (VOUT = 3.3 V, fosc= 250 kHz) -20 0 20 40 Ta [C] 60 80 0 -40 100 -20 0 20 40 Ta [C] 60 80 100 ISSS - Ta (VOUT= 3.3 V, fosc= 250 kHz) 0.8 ISSS 0.6 [A] 0.4 0.2 0.0 -40 500 -20 0 20 40 Ta [C] 60 80 100 ISW -Ta (VOUT = 3.3 V,fosc= 250 kHz) 1.0 0.8 400 ISW 300 ISWQ 0.6 [mA] 200 [A] 0.4 100 0.2 0 -40 ISWQ-Ta (VOUT= 3.3 V,fosc= 250 kHz) -20 0 20 40 Ta [C] 60 80 100 0.0 -40 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 23 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series fosc - Ta (VOUT= 3.3 V, fosc= 50 kHz) 70 60 fosc [kHz] 300 fosc 50 [kHz] 40 250 200 30 -40 -20 0 20 40 Ta [C] 60 80 150 -40 100 MaxDuty - Ta (VOUT = 3.3 V, fosc= 50 kHz) 100 100 90 90 80 MaxDuty [%] 70 80 MaxDuty [%] 70 60 60 50 -40 25 -20 0 20 40 Ta [C] 60 80 PFMDuty - Ta (VOUT= 3.3 V, fosc= 250 kHz) S-8354 Series 1.0 20 40 Ta [C] 60 80 100 MaxDuty - Ta (VOUT = 3.3 V, fosc= 250 kHz) -20 0 20 40 Ta [C] 60 80 100 VSH - Ta (VOUT = 3.3 V, fosc= 250 kHz) VSH 0.6 [V] 10 0.4 0.2 5 -40 -20 0 20 40 Ta [C] 60 80 100 VSL1 - Ta (VOUT= 3.3 V, fosc= 250 kHz) 0.0 -40 1.0 0.8 0.8 VSL1 0.6 VSL2 0.6 [V] 0.4 [V] 0.4 0.2 0.2 0.0 -40 0 0.8 PFMDuty 15 [%] 1.0 -20 50 -40 100 20 24 f osc - Ta (VOUT= 3.3 V, fosc= 250 kHz) 350 -20 0 20 40 Ta [C] 60 80 100 0.0 -40 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 VSL2 - Ta (VOUT= 3.3 V, fosc= 250 kHz) -20 0 20 40 Ta [C] 60 80 100 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series 8 TSS vs. Ta (VOUT = 3.3 V, fOSC = 50 kHz) 8 6 6 TSS 4 [ms] TSS 4 [ms] 2 2 0 -40 1.2 -20 0 20 40 Ta [C] 60 80 0 -40 -20 100 VST1 vs. Ta (VOUT = 3.3 V, fOSC = 250 kHz) 1.2 1.0 20 40 Ta [C] 60 80 100 VST2 vs. Ta (VOUT = 3.3 V, fOSC = 250 kHz) 0.8 VST2 [V] 0.6 0.6 0.4 0.4 0.2 0.2 0.0 -40 3.40 0 1.0 0.8 VST1 [V] TSS vs. Ta (VOUT = 3.3 V, fOSC = 250 kHz) -20 0 20 40 Ta [C] 60 80 100 VOUT vs. Ta (VOUT = 3.3 V, fOSC = 50 kHz) 0.0 -40 3.40 3.35 3.35 VOUT 3.30 [V] VOUT 3.30 [V] 3.25 3.25 3.20 -40 -20 0 20 40 Ta [C] 60 80 100 -20 0 20 40 Ta [C] 60 80 100 VOUT vs. Ta (VOUT = 3.3 V, fOSC = 250 kHz) 3.20 -40 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 25 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Examples of Major Power Supply Dependence Characteristics (Ta= =25C) ISS1,2 - VDD (VOUT = 3.3 V, fOSC= 50 kHz, Ta= 25C) 50 100 40 80 ISS1,2 30 ISSS 60 [A] [A] 20 10 0 0 2 4 VDD 6 [V] 8 10 0 fOSC - VDD (fOSC= 50 kHz) 70 2 4 6 VDD [V] 8 10 f OSC - VDD (fOSC= 250 kHz) 300 60 fosc 40 20 0 [kHz] ISSS - VDD (VOUT = 3.3 V, fOSC= 250 kHz, Ta= 25C) 250 fosc 50 [kHz] 200 40 150 30 100 0 2 6 VDD [V] ISW - VDD 8 10 0 2 4 8 10 500 4 0 2 4 6 VDD [V] 8 10 400 ISW 300 [mA] 200 100 -0 6 VDD [V] VOUT - VDD VOUT - VDD (VOUT= 3.3 V, fOSC= 50 kHz, VDD separate type) VIN= 1.98 V, IOUT= 13.2 mA VOUT [V] (VOUT= 3.3 V, fOSC= 250 kHz, V DD separate type) VIN= 1.98 V, IOUT= 13.2 mA 3.4 3.4 3.3 3.3 VOUT 3.2 [V] 3.1 3.1 3.0 3.0 0 26 3.2 2 4 VDD 6 [V] 8 10 0 Seiko Instruments Inc. 2 4 6 VDD [V] 8 10 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Output Waveforms 1. S-8353A33 2. IOUT=50 mA, VIN=1.98 V 1. IOUT=10 mA, VIN=1.98 V Output voltage Output voltage [0.01 V/div] [0.01 V/div] CONT voltage CONT voltage [1 V/div] [1 V/div] t [10 s/div] t [10 s/div] 3. IOUT=100 mA, VIN=1.98 V Output voltage [0.02 V/div] CONT voltage [1 V/div] t [10 s/div] 2. S-8354H33 1. IOUT = 100 A VIN = 1.98 V Output voltage [0.01 V/div] 2. IOUT = 10 mA VIN = 1.98 V Output voltage [0.01 V/div] 4 4 CONT voltage [1 V/div] 2 CONT voltage [1 V/div] 0 2 0 t [2 s/div] t [2 s/div] 3. IOUT = 50 mA VIN = 1.98 V Output voltage [0.02 V/div] 4. IOUT = 100 mA VIN = 1.98 V Output voltage [0.02 V/div] 4 4 CONT voltage [1 V/div] 2 CONT voltage [1 V/div] 2 0 0 t [2 s/div] Seiko Instruments Inc. t [2 s/div] 27 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Examples of Transient Response Characteristics (Ta= =25C) (S-8354H33) 1. Power-On (VIN; 0 V 2.0 V) 2 VIN [V] 4 0 2 VIN [V] 0 4 2 VOUT [V] t (1 ms/div) 2. 0 2 VOUT [V] 0 t (1 ms/div) ON/ OFF Pin Response (VON/OFF; 0 V 2.0 V) ON/OFF (250 kHz, IOUT = 1 mA, VIN = 2 V) VON/OFF [V] 2 ON/OFF (250 kHz, IOUT = 50 mA, VIN = 2 V) VON/OFF [V] 4 0 2 4 0 2 VOUT [V] t (1 ms/div) 2 VOUT [V] 0 t (1 ms/div) 0 3. Load Fluctuations (250 kHz, IOUT ; 100 A 50 mA, VIN = 1.98 V) Load Fiuctuation Load Fiuctuation (250 kHz, IOUT ; 50 mA 100 A, VIN = 1.98 V) IOUT IOUT 50 mA 50 mA 100 A 100 A VOUT [0.05 V/div] VOUT [0.05 V/div] t (5 ms/div) t (200 s/div) 4. Input Voltage Fluctuations VIN [V] Input voltage fluctuation (250 kHz, IOUT = 50 mA) VIN = 1.98 V 2.64 V VIN [V] 2.64 2.64 1.98 1.98 Input voltage fluctuation (250 kHz, IOUT = 50 mA) VIN = 2.64 V 1.98 V VOUT [0.04 V/div] VOUT [0.02 V/div] t (100 s/div) 28 t (100 s/div) Seiko Instruments Inc. ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series Reference Data Reference data is provided to determine specific external components. Therefore, the following data shows the characteristics of the recommended external components selected for various applications. 1. Reference Data for External Components Table 16 Efficiency vs. Output Characteristics and Output Voltage vs. Output Current Characteristics for External Components No. Product name 1 2 3 4 5 6 7 8 S-8353H50MC S-8353H50MC S-8353H50MC S-8354A50MC S-8354A50MC S-8353A50MC S-8353A50MC S-8353A33MC Oscillation frequency [kHz] 250 250 250 50 50 50 50 50 Output voltage [V] Control system Inductor Diode Output capacitor 5.0 5.0 5.0 5.0 5.0 5.0 5.0 3.3 PWM PWM PWM PWM/PFM PWM/PFM PWM PWM PWM CDRH8D28-220 CDRH5D28-220 CXLP120-220 CDRH8D28-101 CXLP120-470 CDRH8D28-101 CXLP120-470 CDRH8D28-101 MA2Z748 MA2Z748 MA2Z748 MA2Z748 MA2Z748 MA2Z748 MA2Z748 MA2Z748 F93 (16 V, 47 F) F93 (6.3 V, 22 F) F92 (6.3 V, 47 F) F93 (6.3 V, 22 F) F92 (6.3 V, 47 F) F93 (6.3 V, 22 F) F92 (6.3 V, 47 F) F93 (6.3 V, 22 F) The performance of the external components is shown below. Table 17 Properties of External Components Component Inductor Product name CDRH8D28-220 Manufacturer Sumida Corporation CDRH8D28-101 CDRH5D28-220 CXLP120-220 Sumitomo Special Metals Co., Ltd. CXLP120-470 Diode F93 (16 V, 47 F) F93 (6.3 V, 22 F) F92 (6.3 V, 47 F) DC resistance Maximum allowable current Forward voltage Forward current Capacitor *1. *2. *3. *4. MA2Z748 Matsushita Electric Industrial Co., Ltd, Nichicon Corporation Characteristics *1 *2 22 H, DCR =95 m, Imax. =1.6 A, Component height=3.0 mm *1 *2 100 H, DCR =410 m, Imax. =0.75 A, Component height =3.0 mm *1 *2 22 H, DCR =122 m, Imax. =0.9 A, Component height =3.0 mm *1 *2 22 H, DCR =590 m, Imax. =0.55 A, Component height =1.2 mm *1 *2 47 H, DCR =950 m, Imax. =0.45 A, Component height =1.2 mm *3 *4 VF =0.4 V, IF =0.3 A Caution The values shown in the characteristics column of Table 17 above are based on the materials provided by each manufacturer, however, consider the characteristics of the original materials when using the above products. Seiko Instruments Inc. 29 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 2. Reference Data (1) The following shows the actual (a) Output current vs. Efficiency characteristics and (b) Output current vs. Output voltage characteristics under the conditions of No. 1 to 8 in Table 16. (1) S-8353H50MC (b) Output current vs. Output voltage (a) Output current vs. Efficiency Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 5.2 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 (2) S-8353H50MC (a) Output current vs. Efficiency (b) Output current vs. Output voltage Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 5.2 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 (3) S-8353H50MC (a) Output current vs. Efficiency (b) Output current vs. Output voltage Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 0.01 0.1 1 10 100 1000 5.2 5.1 5.0 4.9 4.8 4.7 0.01 Output current IOUT [mA] 30 VIN = 2 V VIN = 3 V VIN = 4 V 0.1 1 10 100 Output current IOUT [mA] Seiko Instruments Inc. 1000 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series (4) S-8354A50MC (b) Output current vs. Output voltage (a) Output current vs. Efficiency Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 0.01 0.1 1 10 100 Output current IOUT [mA] 5.2 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 1000 0.1 1 10 100 Output current IOUT [mA] 1000 (5) S-8354A50MC (a) Output current vs. Efficiency (b) Output current vs. Output voltage Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 5.2 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 (6) S-8353A50MC (b) Output current vs. Output voltage (a) Output current vs. Efficiency Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 5.2 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 Seiko Instruments Inc. 0.1 1 10 100 Output current IOUT [mA] 1000 31 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series (7) S-8353A50MC (b) Output current vs. Output voltage (a) Output current vs. E fficiency 5.2 Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 2 V VIN = 3 V VIN = 4 V 40 20 5.1 5.0 4.9 VIN = 2 V VIN = 3 V VIN = 4 V 4.8 4.7 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 (8) S-8354A33MC (a) Output current vs. Efficiency (b) Output current vs. Output voltage Output voltage VOUT [V] Efficiency [%] 100 80 60 VIN = 0.9 V VIN = 1.8 V VIN = 2.7 V 40 20 3.4 3.3 3.2 VIN = 0.9 V VIN = 1.8 V VIN = 2.7 V 3.1 3.0 0.01 32 3.5 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 Seiko Instruments Inc. 0.1 1 10 100 Output current IOUT [mA] 1000 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2 _00 S-8353/8354 Series 3. Reference Data (2) The following shows the actual output current vs. ripple voltage characteristics under the conditions of No. 1 to 8 in Table 16. (1) S-8353H50MC (2) S-8353H50MC Output current vs. Ripple voltage Ripple voltage Vr [mV] Ripple voltage Vr [mV] Output current vs. Ripple voltage 100 VIN = 2 V VIN = 3 V VIN = 4 V 80 60 40 20 100 60 40 20 0 0 0.01 0.1 1 10 100 Output current IOUT [mA] 0.01 1000 (3) S-8353H50MC Output current vs. Ripple voltage 200 Ripple voltage Vr [mV] VIN = 2 V VIN = 3 V VIN = 4 V 160 120 0.1 1 10 100 Output current IOUT [mA] 80 40 Output current vs. Ripple voltage VIN = 2 V VIN = 3 V VIN = 4 V 160 120 80 40 0 0 0.01 0.1 1 10 100 0.01 1000 0.1 (5) S-8354A50MC Output current vs. Ripple voltage 160 100 1000 Output current vs. Ripple voltage Ripple voltage Vr [mV] 200 10 (6) S-8353A50MC 280 240 1 Output current IOUT [mA] Output current IOUT [mA] Ripple voltage Vr [mV] 1000 (4) S-8354A50MC 200 Ripple voltage Vr [mV] VIN = 2 V VIN = 3 V VIN = 4 V 80 VIN = 2 V VIN = 3 V VIN = 4 V 120 80 40 0 200 VIN = 2 V VIN = 3 V VIN = 4 V 160 120 80 40 0 0.01 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 Seiko Instruments Inc. 0.1 1 10 100 Output current IOUT [mA] 1000 33 ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series 280 (8) S-8353A33MC Output current vs. ripple voltage Ripple voltage Vr [mV] Ripple voltage Vr [mV] (7) S-8353A50MC VIN = 2 V VIN = 3 V VIN = 4 V 240 200 160 120 80 40 Output current vs. ripple voltage 160 120 VIN = 0.9 V VIN = 1.8 V VIN = 2.7 V 80 40 0 0 0.01 34 200 0.1 1 10 100 Output current IOUT [mA] 1000 0.01 Seiko Instruments Inc. 0.1 1 10 100 Output current IOUT [mA] 1000 2.90.2 1 2 3 0.16 +0.1 -0.05 0.950.1 1.90.2 0.40.1 No. MP003-A-P-SD-1.1 TITLE SOT233-A-PKG Dimensions MP003-A-P-SD-1.1 No. SCALE UNIT mm Seiko Instruments Inc. +0.1 1.5 -0.05 4.00.1 2.00.1 1.10.1 0.250.05 1.60.1 4.00.1 2.850.2 3 2 1 Feed direction No. MP003-A-C-SD-1.1 TITLE No. SOT233-A-Carrier Tape MP003-A-C-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 (60) (60) No. MP003-A-R-SD-1.1 TITLE SOT233-A-Reel No. MP003-A-R-SD-1.1 SCALE UNIT QTY. 3,000 mm Seiko Instruments Inc. 2.90.2 1.90.2 4 5 1 2 +0.1 0.16 -0.06 3 0.950.1 0.40.1 No. MP005-A-P-SD-1.2 TITLE No. SOT235-A-PKG Dimensions MP005-A-P-SD-1.2 SCALE UNIT mm Seiko Instruments Inc. 4.00.1(10 pitches:40.00.2) +0.1 o1.5 -0 2.00.05 +0.2 o1.0 -0 0.250.1 4.00.1 1.40.2 3.20.2 3 2 1 4 5 Feed direction No. MP005-A-C-SD-2.1 TITLE SOT235-A-Carrier Tape No. MP005-A-C-SD-2.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 (60) (60) No. MP005-A-R-SD-1.1 SOT235-A-Reel TITLE No. MP005-A-R-SD-1.1 SCALE QTY. UNIT mm Seiko Instruments Inc. 3,000 4.50.1 1.50.1 1.60.2 1 2 3 1.50.1 1.50.1 0.40.05 45 0.40.1 0.40.1 0.450.1 No. UP003-A-P-SD-1.1 TITLE SOT893-A-PKG Dimensions No. UP003-A-P-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. +0.1 o1.5 -0 4.00.1(10 pitches : 40.00.2) 2.00.05 o1.5 +0.1 -0 5 max. 0.30.05 8.00.1 2.00.1 4.750.1 Feed direction No. UP003-A-C-SD-1.1 TITLE SOT893-A-Carrier Tape No. UP003-A-C-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. 16.5max. 13.00.3 Enlarged drawing in the central part (60) (60) No. UP003-A-R-SD-1.1 SOT893-A-Reel TITLE No. UP003-A-R-SD-1.1 SCALE UNIT QTY. mm Seiko Instruments Inc. 1,000 * * * * * * The information described herein is subject to change without notice. Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. 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