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S-8520F40MC-BNZT2x Datasheet(PDF) 1 Page - Seiko Instruments Inc |
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S-8520F40MC-BNZT2x Datasheet(HTML) 1 Page - Seiko Instruments Inc |
1 / 44 page S-8520/8521 Series www.sii-ic.com STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER © SII Semiconductor Corporation, 1997-2010 Rev.9.0_01 1 The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM / PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an error amplifier, and other components. The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit that prevents overshoot at startup. The S-8521 Series works with either PWM control or PFM control. It normally operates using PWM control with a duty ratio of 25% to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. The S-8520/8521 Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation. By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input voltage up to 16 V. Features • Low current consumption During operation: 60 μA max. (A, B types) 21 μA max. (C, D types) 100 μA max. (E, F types) During shutdown: 0.5 μA max. • Input voltage: 2.5 V to 16 V (B, D, F types) 2.5 V to 10 V (A, C, E types) • Output voltage: Selectable between 1.5 V and 6.0 V in 0.1 V step • Duty ratio: 0% to 100% PWM control (S-8520 Series) 25% to100% PWM / PFM switching control (S-8521 Series) • External parts are Pch power MOS FET or PNP transistor, coil, diode, and capacitor only (When using PNP transistor, add base resistor and capacitor). • Oscillation frequency: 180 kHz typ. (A, B types) 60 kHz typ. (C, D types) 300 kHz typ. (E, F types) • Soft-start function: 8 ms. typ. (A, B types) 12 ms. typ. (C, D types) 4.5 ms. typ. (E, F types) • With a shutdown function • With a built-in overload protection circuit Overload detection time: 4 ms. typ. (A type) 14 ms. typ. (C type) 2.6 ms. typ. (E type) • Lead-free, Sn 100%, halogen-free*1 *1. Refer to “ Product Name Structure” for details. |
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