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S-8340A25AFT-T2-U Datasheet(PDF) 10 Page - Seiko Instruments Inc |
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S-8340A25AFT-T2-U Datasheet(HTML) 10 Page - Seiko Instruments Inc |
10 / 55 page STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8340/8341 Series Rev.4.0_01 10 External parts Coil : Sumida Corporation CD54 (10 μH) Diode : Matsushita Electronic Industrial Co., Ltd. MA735 (Schottky type) Capacitor : Nichicon Corporation F93 (16 V, 47 μF, tantalum type) Transistor : Sanyo Electric Co., Ltd. 2SD1628G Base resistor (Rb) : 1.0 k Ω Base capacitor (Cb) : 2200 pF (ceramic type) CVREF : 0.01 μF CSS : 4700 pF RFB1 : 300 k Ω RFB2 : 100 k Ω CFB : 50 pF The ON/OFF pin is connected to the VOUT pin unless otherwise specified. Connect the SENSE pin to the VSS pin. *1. VOUT(E) : Actual output voltage value : Output voltage value when IOUT = 80 mA and VIN = 2.4 V is applied. The Typ. value (set output voltage value) is 1 + [V] *2. The change of output voltage with temperature [mV/ °C] is calculated from the following formula. However, the temperature change rates for RFB1 and RFB2 are assumed to be the same. = (1 + ) ΔVOUT ΔTa • VOUT ΔVOUT ΔTa RFB1 RFB2 [mV/ °C] × [ppm/ °C] ÷ 1000 (Change of output voltage (Set output (Output voltage temperature with temperature) voltage value) coefficient) Caution The S-8340/8341 Series steps up from VDD = 0.9 V. However, 2.5 V or more for VDD is recommended to stabilize the output voltage and oscillation frequency. If VDD is taken from VIN or other power sources, instead of VOUT, VDD should be 2.5 V or more. However, if VDD is other than 4.0 V, note that the output voltage accuracy of ±2.0% is not guaranteed due to dependency of output voltage on VDD. In particular, accuracy of output voltage is degraded significantly when the VDD voltage is 6.0 V or more. Therefore, do not use this IC when the VDD voltage is 6.0 V or more. If VDD of 2.5 V or more is applied, increase power supply so that VDD becomes 2.5 V or more within the soft-start time (3.0 ms). 300 k Ω 100 k Ω |
Similar Part No. - S-8340A25AFT-T2-U |
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Similar Description - S-8340A25AFT-T2-U |
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