S-8533 Seiko Instruments, S-8533 Datasheet
S-8533
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S-8533 Summary of contents
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... P-channel and N-channel power MOS FETs, one coil, and three capacitors. Since the oscillation frequency is a high 300 kHz, the S-8533 can be used to configure a high efficiency step-down switching regulator capable of driving high output current using small external parts and 10% increase in efficiency is obtained compared to conventional step-down switching regulators ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series Block Diagram Tr VIN PDRV NDRV + CSS SS Remark All the diodes in the figure are parasitic diodes Oscillation circuit PWM control circuit − P.N feed-through prevention circuit + Reference voltage source with soft start ...
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... Rev.2.3 _00 Product Name Structure The output voltage for the S-8533 Series can be selected depending on usage. Refer to “1. Product name” for the definition of the product name and “2. Product name list” for the full product names. 1. Product Name S-8533A ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series Pin Configurations 8-Pin TSSOP Top view Figure 2 4 Pin No. Symbol * VOUT OFF ON/ 4 CSS 5 VSS 6 NDRV 7 PDRV 8 VIN *1. The NC pin is electrically open. Connection of this pin to VIN or VSS is allowed ...
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... D T opr T stg (2) When not mounted on board 400 300 200 100 0 150 100 Figure 3 Power Dissipation of Package Seiko Instruments Inc. S-8533 Series (Ta = 25°C unless otherwise specified) − 0 − 0 − 0 − ...
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... The same condition SS1 ON/OFF The same condition Measure time until SS1 PDRV pin oscillates. * 200 to 400 mA, S-8533A33A OUT Sumida Corporation Matsushita Electric Industrial Co., Ltd. MA737 (Schottky diode) Nichicon Corporation Toshiba Corporation 2200 pF 4700 pF 1000 pF × 1 ...
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... NDRV VSS Figure 4 VIN PDRV CSS ON/OFF VOUT NDRV VSS Figure 5 VIN PDRV CSS ON/OFF VOUT VSS NDRV Figure 6 Seiko Instruments Inc. S-8533 Series 2200 pF 1 kΩ F93 2SA1213-Y 22 μF × CD105 22 μH MA737 F93 F93 47 μF 47 μF C NDRV 1000 pF ...
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... Both of these effects constitute inherent drawbacks to those converters. In the S-8533 Series, the pulse width varies in the range from 0 to 100% according to the load current, yet the ripple voltage produced by the switching can easily be eliminated by a filter since the switching frequency is always constant ...
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... Figure 8 ON/OFF Pin Structure 4. 100% Duty Cycle The S-8533 Series operates with a maximum duty cycle of 100%. The switching transistor can be kept on to supply current to the load continually, even in cases where the input voltage falls below the preset output voltage value. The output voltage under these circumstances is equal to the subtraction of the lowering due to the DC resistance of the coil and the on-resistance of the switching transistor from the input voltage ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series Though the conditions mentioned above are required to prevent back-flow current, they are guidelines. Check the validity by measuring the prototype or the actual device. Coil current under no load I L 109 OUT − ...
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... L value. As the L value is made even larger, the efficiency degrades since the dissipation due to the series resistance of the coil increases inductance of 22 μH is recommended for the S-8533 Series. When choosing an inductor, attention to its allowable current should be paid since the current exceeding the allowable value will cause magnetic saturation in the inductor, leading to a marked decline in efficiency and the breakdown of the IC due to large current ...
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... Enhancement (P-channel, N-channel) MOS FETs can be used as external switching transistors for the S-8533 Series Enhancement (P-channel, N-channel) MOS FET The PDRV/NDRV pin of the S-8533 Series is capable of directly driving a P-channel or N-channel MOS FET with a gate capacity around 1000 pF. When P-channel/N-channel MOS FETs are chosen, efficiency will higher than that achieved by a PNP/NPN bipolar transistor since MOS FET switching speeds are higher than PNP/NPN bipolar transistors and power dissipation due to the base current is avoided ...
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... Caution The above connection diagram does not guarantee correct operation. Perform sufficient evaluation using the actual application to set the constants Power Pch Power MOS FET MOS FET 1 8 S-8533 Figure 11 Seiko Instruments Inc. S-8533 Series ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series Precautions • Install the external capacitors, diode, coil, and other peripheral parts as close to the IC as possible, and make a one- point grounding. • Normally, the P-channel and N-channel MOS FETs do not turn ON at the same time. However, if the external P- channel MOS FET has much different characteristics (input capacitance, V FET, they may turn ON at the same time, flowing a through current ...
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... V ( vs. (8) ON/OFF Pin Input Voltage “L” ( (V) IN Seiko Instruments Inc. S-8533 Series ) vs. Input Voltage (V OSC 360 340 Ta = 85°C 320 300 Ta = −40°C 280 Ta = 25°C 260 240 (V) IN ...
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... IN (1 S-8533A15AFT) 3. 100 mA OUT 3.35 3.33 V 3.31 OUT ( 400 mA 3.29 OUT 3.27 3. S-8533A50AFT 400 mA OUT (V) IN Seiko Instruments Inc. ) vs. Input Voltage (V OUT (3 S-8533A33AFT 0.1 mA OUT I = 100 mA OUT (V) IN Rev.2.3 _00 ) 400 mA OUT 14 16 ...
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... V/div 4.5 V Output voltage (1.5 V/div S-8533A15AFT (V Input voltage Output voltage t (2 ms/div) S-8533A33AFT (V Input voltage Output voltage t (2 ms/div) S-8533A50AFT (V Input voltage Output voltage t (2 ms/div) Seiko Instruments Inc. S-8533 Series : 10 mA) OUT : 0 V → 9 (2.5 V/div V/div) ...
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... V/div 4.5 V Output voltage (1.5 V/div → 1 mA) ON/OFF OUT S-8533A15AFT (V pin voltage Output voltage t (2 ms/div) S-8533A33AFT (V pin voltage Output voltage t (2 ms/div) S-8533A50AFT (V pin voltage Output voltage t (2 ms/div) Seiko Instruments Inc ON/OFF (1 V/div ...
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... IN 500 mA Output current 0.1 mA Output voltage (0.1 V/div) S-8533A15AFT (V Output current Output voltage (0.1 V/div) t (0.1 ms/div) S-8533A33AFT (V Output current Output voltage (0.1 V/div) t (0.1 ms/div) S-8533A50AFT (V Output current Output voltage (0.1 V/div) t (0.1 ms/div) Seiko Instruments Inc. S-8533 Series : 500 mA 0 (0.1 ms/div 500 mA ...
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... Input voltage (2.5 V/div Output voltage (0.1 V/div 2.7 V → 9.0 V → 2.7 V, 5.0 V → 9.0 V → 5.0 V, 7.5 V → 9.0 V → 7 S-8533A15AFT (I Input voltage Output voltage t (0.5 ms/div) S-8533A33AFT (I Input voltage Output voltage t (0.5 ms/div) S-8533A50AFT (I Input voltage Output voltage t (0.5 ms/div) Seiko Instruments Inc. : 500 mA) OUT 10 V (2.5 V/div ...
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... Si3441DV Si3442DV CPH6302 CPH6402 Si3455DV Si3454DV CPH6302 CPH6402 Si3455DV Si3454DV CDRH125/10 μH CPH6303 CPH6403 CPH6302 CPH6402 Seiko Instruments Inc. S-8533 Series Output Input Application Condition Capacitor Capacitor 47 μF × μF, 0.1 μF I ≤ OUT IN ≤ 1 OUT ≤ OUT IN ≤ ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series External Parts List for Ripple Data Table 5 External Parts for Input Voltage vs. Ripple Voltage Characteristics Data Output No. Product Name Voltage (27) S-8533A15AFT 1.5 V (28) (29) S-8533A33AFT 3.3 V (30) (31) (32) (33) S-8533A50AFT 5.0 V (34) Performance Data for Parts The following shows the performance of external parts ...
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... Output current (mA) (7) S-8533A50AFT (CPH6302/CPH6402) 100 100 Output current (mA) ) vs. efficiency (η) characteristics when the S-8533 Series is used OUT (2) S-8533A15AFT (Si3441DV/Si3442DV) 100 5 1000 10000 (4) S-8533A33AFT (Si3441DV/Si3442DV) 100 ...
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... 100 Ou tput current (mA) 24 (10) S-8533A15AFT (Si3441DV/Si3442DV) 100 5 1000 10 000 (12) S-8533A33AFT (Si3441DV/Si3442DV) 100 7 000 10000 (14) S-8533A33AFT (Si3454DV/Si3455DV) 100 000 10000 ...
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... 100 Output current (mA) (18) S-8533A15AFT (Si3441DV/Si3442DV 5 1000 10000 (20) S-8533A33AFT (Si3441DV/Si3442DV 7 1000 10000 (22) S-8533A33AFT (Si3454DV/Si3455DV 1000 ...
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... STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER www.DataSheet4U.com S-8533 Series (25) S-8533A33AFT (CPH6303/CPH6403 4. 7 100 (mA) Output current 26 (26) S-8533A33AFT (CPH6302/CPH6402) 100 1000 10000 1 Seiko Instruments Inc. Rev.2 100 1000 10000 ...
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... S-8533A50AFT (Si3454DV/Si3455DV 1000 10000 Seiko Instruments Inc. S-8533 Series ) characteristics when the S-8533 Series 100 1000 Out pu t current (mA) 4. 100 1000 Output current (mA 4. ...
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... 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 ...