S-8821

Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series The S-8821 series is a CMOS step-up charge pump DC-DC converter with a voltage regulation function. The S-8821 series consists of an oscillation circuit, a controller, a reference voltage circuit, an error amplifier circuit, and an output switching transistor, and can regulate the output voltage by PFM control. Since small ceramic capacitors can be used for the pump capacitor, input capacitor, and output capacitor, the mounting area can be minimized. Features • Step-up PFM control CMOS charge pump • Power supply voltage: • Output voltage: • Output voltage accuracy: • Built-in soft start circuit: • Output current • Oscillation frequency: • ON/OFF function: • Ultra-small package: • Lead-free products 1.6 to 5.0 V 2.5 to 5.5 V, selectable in 0.1 V steps. ±2 % max. 1.0 ms typ. 25 mA (VIN=(VOUT(S) × 0.80) V) 1.0 MHz typ. During standby: 1 μA max. SOT-23-6W Applications • Lithium ion battery driven applications • Local power supply • Power supply for white LED display backlights Packages Package Name Package Drawing Code Tape Reel SOT-23-6W MP006-B MP006-B MP006-B Seiko Instruments Inc. 1 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Block Diagram VIN CIN=4.7 μF SW1 Rev.3.1_00 VOUT COUT=10 μF Rs C+ CPUMP=0.10 μF SW 2 Switch control circuit PFM control oscillator circuit (1.0 MHz) + - Rf C− SW 3 Soft start circuit SW 4 ON/OFF circuit Reference voltage ON/OFF GND Figure 1 2 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Product Name Structure • The output voltage and packages for the S-8821 Series can be selected at the user’s request. Refer to the “Product name” for the meanings of the characters in the product name and “Product name list” for the full product names. 1. Product name S-8821 xx A MH – xxx TF G IC direction in tape specifications*1 Product name (abbreviation)*2 Package name (abbreviation) MH: SOT-23-6W Output voltage 25 to 55 (E.g., when the output voltage is 2.5 V, it is expressed as 25.) *1. Refer to the taping specifications at the end of this book. *2. Refer to the product name list. 2. Product name list Table 1 Output Voltage SOT-23-6W 2.5 V S-882125AMH-M2ATFG 3.0 V S-882130AMH-M2FTFG 3.3 V S-882133AMH-M2ITFG 3.5 V S-882135AMH-M2KTFG 3.6 V S-882136AMH-M2LTFG 4.0 V S-882140AMH-M2PTFG 4.5 V S-882145AMH-M2UTFG 5.0 V S-882150AMH-M2ZTFG 5.2 V S-882152AMH-M3BTFG 5.5 V S-882155AMH-M3ETFG Remark Contact the SII sales department for products with an output voltage other than those specified above. Seiko Instruments Inc. 3 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Pin Configurations SOT-23-6W Top view 6 5 4 Rev.3.1_00 Table 2 Pin No. 1 2 3 4 Symbol VIN C+ C− ON/OFF GND VOUT Pin Description Voltage input pin Charge-pump pump capacitor connection pin (positive pin) Charge-pump pump capacitor connection pin (negative pin) Shutdown pin High level (H) : normal operation (step-up) Low level (L) : step-up halt (all circuit halt) GND pin Voltage output pin 1 2 3 5 6 Figure 2 4 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Absolute Maximum Ratings Table 3 Items C+ pin voltage C− pin voltage VIN pin voltage VOUT pin voltage ON/OFF pin voltage Power dissipation Symbols VC+ VC− VIN VOUT VON/OFF PD (Ta=25°C unless otherwise specified) Absolute Maximum Ratings Units V VGND−0.3 to VGND+7.5 V VGND−0.3 to VGND+7 V VGND−0.3 to VGND+5.5 V VGND−0.3 to VGND+7 V VGND−0.3 to VIN+0.3 300 (When not mounted on board) mW mW 650*1 −40 to +85 °C −40 to +125 °C Operating ambient temperature Topr Storage temperature Tstg *1. When mounted on board [Mounted board] (1) Board size: 114.3 mm × 76.2 mm × t1.6 mm (2) Board name: JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (2) When not mounted on board 400 Power Dissipation PD (mW) 150 350 300 250 200 150 100 50 0 0 50 100 150 (1) When mounted on board 800 Power Dissipation PD (mW) 700 600 500 400 300 200 100 0 0 50 100 Ambient Temperature Ta (°C) Ambient Temperature Ta (°C) Figure 3 Power Dissipation of Package Seiko Instruments Inc. 5 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Electrical Characteristics Table 4 Rev.3.1_00 (VIN=(VOUT(S) × 0.60) V*1, Ta=25°C unless otherwise specified) Items Symbols Conditions VOUT(S) ≤ 2.9 V Min. Typ. Max. Units V V V mA mA mA mV mV mVp−p kHz % Test circuits 2 2 2 2 2 2 2 2 2 2 1 2 1 1 1 1 1 1 Operation input voltage VIN Output voltage*2 Output current*3 VOUT(E) IOUT VOUT(S) > 2.9 V IOUT=10 mA VIN=(VOUT(S) × 0.54) V VIN=(VOUT(S) × 0.60) V*1 VIN=(VOUT(S) × 0.80) V VIN=(VOUT(S) × 0.60) V*1 to (VOUT(S) − 0.10) V, IOUT=10 mA IOUT=0.1 mA to 10 mA IOUT=10 mA VOUT=(VOUT(S) × 0.60) V, Measure waveform at C− pin VIN=(VOUT(S) × 0.54) V, VOUT(S) ≥ 3.0 V, IOUT=5 mA VIN=VOUT(S), VOUT=(VOUT(S) + 0.5) V VIN=(VOUT(S) × 0.54) V*6 to 5.0 V, VON/OFF=0 V *6 1.6 ⎯ 5.0 VOUT(S) × ⎯ 5.0 0.54 VOUT(S) × VOUT(S) × VOUT(S) 0.98 1.02 5 ⎯ ⎯ 15 ⎯ ⎯ 25 ⎯ ⎯ ⎯ ⎯ ⎯ 800 ⎯ 50 40 70 1000 90 100 80 ⎯ 1200 ⎯ Line regulation Load regulation Ripple voltage*4 Maximum oscillation frequency Efficiency*5 ΔVOUT1 ΔVOUT2 VRIP fosc η Operation consumption ISS1 ⎯ 35 60 μA current Standby consumption ISSS ⎯ 0.3 1.0 μA current ON/OFF pin input VSH VIN=(VOUT(S) × 0.54) V*6 to 5.0 V 1.5 ⎯ ⎯ V voltage (high level) ON/OFF pin input VSL VIN=(VOUT(S) × 0.54) V*6 to 5.0 V ⎯ ⎯ 0.3 V voltage (low level) ON/OFF pin input ISH VIN=(VOUT(S) × 0.54) V*6 to 5.0 V −0.1 ⎯ 0.1 μA current (high level) ON/OFF pin input ISL VIN=(VOUT(S) × 0.54) V*6 to 5.0 V −0.1 ⎯ 0.1 μA current (low level) Soft start time tSS IOUT=10 mA 0.2 1.0 4.0 ms *1. In case of VOUT ≤ 3.3 V, VIN=2.0 V *2. VOUT(E): Actual output voltage VOUT(S): Specified output voltage *3. The output current at which the output voltage becomes 97 % of VOUT(E) after gradually increasing the output current. *4. Design assurance *5. The ideal efficiency is indicated by the following expression. Efficiency (η)=(VOUT × IOUT) / (2.0 × VIN × IOUT) *6. In case of VOUT ≤ 2.9 V, VIN=1.6 V 6 Seiko Instruments Inc. Rev.3.1_00 Test Circuits 1. VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series VIN C+ C− 4.7 μF A A A VOUT GND ON/OFF A A Figure 4 2. VIN 0.1 μF 4.7 μF C+ C− A VOUT GND ON/OFF A 10 μF Figure 5 Seiko Instruments Inc. 7 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Operation 1. Basic operation Rev.3.1_00 Figure 6 shows the block diagram of the S-8821 Series. The S-8821 series controls the output voltage by using the pulse frequency modulation (PFM) method. The SW1 to SW4 switching transistors are switched ON/OFF with the clock generated by the internal oscillator circuit, and operates the step-up charge pump. The output voltage is fed back and the voltage split by feedback resistances Rs and Rf and reference voltage (Vref) are compared by a comparator. This comparator signal is used to modulate the oscillation pulse frequency in order to keep the output voltage constant. VIN CIN=4.7 μF SW1 VOUT COUT=10 μF Rs C+ CPUMP=0.10 μF SW 2 Switch control circuit C− SW 3 Soft start circuit PFM control oscillator circuit (1.0 MHz) + - Rf SW 4 ON/OFF circuit Reference voltage ON/OFF GND Figure 6 8 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series 2. Step-up Charge Pump The step-up charge pump steps up the voltage by switching ON/OFF of the SW1 to SW4 switching transistors. First, in order to charge the pump capacitance (CPUMP), set SW1 to OFF, SW2 to ON, SW3 to OFF, and SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged electricity to the output capacitance (COUT), SW1 set the switches as to ON, SW2 to OFF, SW3 to ON, and SW4 to OFF (discharge cycle). The input voltage can be stepped up to a constant voltage value by repeating this charge cycle and discharge cycle. Figure 7 shows the charge cycle, and Figure 8 shows the discharge cycle. SW 2: ON SW 1: OFF V IN Current flo w C PUMP 0 .10 μF C OUT 1 0 μF SW 4: ON SW 3: OFF Figure 7 SW 2: OFF SW 1: ON V IN C PUMP 0 .10 μF Current flow C OUT 1 0 μF SW 4: OFF SW 3: ON Figure 8 Seiko Instruments Inc. 9 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series 3. Shutdown Pin (ON/OFF Pin) Rev.3.1_00 Setting the ON/OFF pin to the Low level ("L") causes the voltage of the VOUT pin to change to the GND level and simultaneously the operation of all the internal circuit to stop. At this time, the consumption current is largely reduced, to a level of approximately 0.3 μA. The structure of the ON/OFF pin is as shown in Figure 9. Since the ON/OFF pin is neither pulled down nor pulled up internally, do not use it in the floating state. When the ON/OFF pin is not used, connect it to the VIN pin. Table 5 ON/OFF pin “H”: Power on “L”: Power off Internal circuit Operating Stop VOUT pin voltage Set value VGND level VIN VIN ON/OFF GND Figure 9 4. Soft Start Function The S-8821 Series features a built-in soft start circuit. Upon power application or when the ON/OFF pin is switched from "L" to "H", the output voltage gradually rises over the soft start time, and the output current is gradually output as a result. This soft start function reduces the input current rush. 10 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series External Capacitor Selection 1. Input and Output Capacitors (CIN, COUT) The input capacitor (CIN) lowers the power supply impedance and averages the input current. The CIN value is selected according to the impedance of the power supply that is used. Select a ceramic capacitor with a small equivalent series resistance (ESR). Although this figure varies according to the impedance of the power supply that is used as well as the load current value, it is generally in the range of 4.7 μF to 10 μF. For the output capacitor (COUT), select a ceramic capacitor with a small ESR for smoothing the ripple voltage. A value of 10 μF is recommended for the capacitance value. Use of a capacitor with a capacitance lower than 10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a capacitance greater than 10 μF results in the output voltage not being able to rise up to setting value and the impossibility to obtain the desired output current. 2. Pump Capacitor (CPUMP) The pump capacitor (CPUMP) is required for stepping up the voltage. Select a ceramic capacitor with a small ESR. A capacitance value of 0.10 μF is recommended. Use of a capacitor with a capacitance greater than 0.10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a capacitance lower than 0.10 μF results in the output voltage not being able to raise up to setting value and the impossibility to obtain the desired output current. Seiko Instruments Inc. 11 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Precautions Rev.3.1_00 • Regarding the wiring to the VIN pin, VOUT pin, C+ pin, C− pin and GND pin, be careful to perform pattern wiring so as to obtain low impedance. • Always connect a capacitor to the VOUT pin, C+ pin, and C− pin. • Connect CIN and COUT in the vicinity of the IC and sufficiently strengthen the wiring for GND pin and VIN pin in order to lower the impedance of the wiring resistance, etc. High impedance may cause unstable operation. Moreover, in selecting CIN and COUT, perform a full evaluation of the actual usage conditions. • Connect CPUMP in the vicinity of the IC and sufficiently strengthen the wiring for the C+ pin and C− pin in order to lower the impedance of the wiring resistance, etc. High impedance may cause instable operation. Moreover, in selecting CPUMP, perform a full evaluation of the actual usage conditions. • The ON/OFF pin is configured as shown in Figure 9 and is neither pulled up or down internally, so do not use this pin in a floating state. When not using the ON/OFF pin, connect it to the VIN pin. Moreover, please do not apply voltage higher than VIN + 0.3 V to an ON/OFF pin. Current flows for a VIN pin through the protection diode inside IC. • Since this IC consists of double step-up circuits, it cannot set more than twice voltage of VIN to VOUT(S). • Be careful about the usage conditions for the input/output voltages and output current to make sure that dissipation within the IC does not exceed the allowable power dissipation of the package. For reference, the calculation of the power consumption in this IC is shown below. PD=(VIN × 2.0 − VOUT) × (IOUT) Reference: VIN=4.2 V, VOUT=5.5 V, IOUT=10 mA PD=(4.2 × 2.0 − 5.5) × 0.010=29 mW • Since the information described herein is subject to change without notice, confirm that this is the latest one before using. • 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 by a third party. 12 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Characteristics (Typical Data) (1) Output voltage vs. Operation input voltage S-882133A IOUT=10 mA, Ta=25°C S-882150A IOUT=10 mA, Ta=25°C 3.50 3.45 3.40 VOUT [V] VOUT [V] 5.30 5.20 5.10 5.00 4.90 4.80 2.0 2.5 3.0 3.5 VIN [V] 3.35 3.30 3.25 3.20 3.15 3.10 1.5 4.0 4.5 5.0 5.5 4.70 1.5 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 (2) Output voltage vs. Output current S-882133A VIN=2.0 V, Ta=25°C S-882150A VIN=3.0 V, Ta=25°C 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 0 5 10 15 IOUT [mA] 5.30 5.20 5.10 VOUT [V] VOUT [V] 5.00 4.90 4.80 20 25 30 4.70 0 5 10 15 IOUT [mA] 20 25 30 (3) Operation consumption vs. Operation input voltage S-882133A Ta=25°C S-882150A Ta=25°C 50 45 40 35 30 25 20 15 10 1.5 2.0 2.5 3.0 3.5 VIN [V] 50 45 40 ISS1 [μA] ISS1 [μA] 35 30 25 20 15 10 1.5 2.0 4.0 4.5 5.0 5.5 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 Seiko Instruments Inc. 13 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Rev.3.1_00 (4) Ripple voltage vs. Operation input voltage S-882133A IOUT=10 mA, Ta=25°C S-882150A IOUT=10 mA, Ta=25°C 100 80 VRIP [mVp-p] VRIP [mVp-p] 100 80 60 40 20 2.5 3.0 3.5 VIN [V] 60 40 20 0 1.5 2.0 4.0 4.5 5.0 5.5 0 1.5 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 (5) Efficiency*1 vs. Operation input voltage S-882133A IOUT=10 mA, Ta=25°C S-882150A IOUT=10 mA, Ta=25°C 100 80 η [%] η [%] 100 80 60 40 20 1.5 2.0 60 40 20 1.5 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 *1. The ideal efficiency is indicated by the following expression. Efficiency (η)=(VOUT × IOUT) / (2.0 × VIN × IOUT) (6) Maximum oscillation frequency vs. Operation input voltage S-882133A Ta=25°C S-882150A Ta=25°C 1300 1200 fOSC [kHz] fOSC [kHz] 1300 1200 1100 1000 900 800 2.5 3.0 3.5 VIN [V] 1100 1000 900 800 700 1.5 2.0 4.0 4.5 5.0 5.5 700 1.5 2.0 2.5 3.0 3.5 VIN [V] 4.0 4.5 5.0 5.5 14 Seiko Instruments Inc. Rev.3.1_00 VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series (7) Load fluctuation S-882133A VIN=2.0 V S-882150A VIN=3.0 V CH1 CH1 10 mA CH2 1 mA [1 ms/div.] CH1: VOUT [20 mV/div.] CH2: IOUT [2 mA/div.] 10 mA CH2 1 mA [1 ms/div.] CH1: VOUT [20 mV/div.] CH2: IOUT [2 mA/div.] (8) Input voltage fluctuation S-882133A IOUT=10 mA S-882150A IOUT=10 mA CH1 CH1 5.0 V CH2 1.8 V [1 ms/div.] CH1: VOUT [20 mV/div.] CH2: VIN [1 V/div.] 3.3 V CH2 3.0 V [1 ms/div.] CH1: VOUT [20 mV/div.] CH2: VIN [1 V/div.] Seiko Instruments Inc. 15 2.9±0.2 1.9±0.2 6 5 4 0.95 1 2 3 0.95 0.15 -0.08 +0.1 0.4 -0.05 +0.1 No. MP006-B-P-SD-1.0 TITLE No. SCALE UNIT SOT236-B-PKG Dimensions MP006-B-P-SD-1.0 mm Seiko Instruments Inc. 4.0±0.1(10 pitches:40.0±0.2) +0.1 ø1.5 -0 2.0±0.05 0.25±0.1 ø1.0 -0 +0.2 4.0±0.1 1.4±0.2 3.2±0.2 321 456 Feed direction No. MP006-B-C-SD-1.0 TITLE No. SCALE UNIT SOT236-B-Carrier Tape MP006-B-C-SD-1.0 mm Seiko Instruments Inc. 12.5max. Enlarged drawing in the central part ø13±0.2 9.0±0.3 (60°) (60°) No. MP006-B-R-SD-1.0 TITLE No. SCALE UNIT mm SOT236-B-Reel MP006-B-R-SD-1.0 QTY 3,000 Seiko Instruments Inc. • • • • • • 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. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. When the products described herein are regulated products subject to the Wassenaar Arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.