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S8353 Datasheet(PDF) 1 Page - Seiko Instruments Inc |
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S8353 Datasheet(HTML) 1 Page - Seiko Instruments Inc |
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1 / 49 page  S-8353/8354 Series www.sii-ic.com STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR © SII Semiconductor Corporation, 2002-2010 Rev.3.0_01 1 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 control circuit (S-8353 Series) and a PWM / PFM switching control circuit (S-8354 Series). The S-8353/8354 Series can configure the step-up switching regulator with an external coil, capacitor, and diode. In addition to the above features, the small package and low current consumption make the S-8353/8354 Series ideal for portable equipment applications requiring high efficiency. The S-8353 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM control circuit whose duty ratio can be varied linearly from 0% to 83% (from 0% to 78% for 250 kHz models), an excellently 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: Startup at 0.9 V min. (IOUT = 1 mA) guaranteed • Low current consumption : During operation 18.7 μA (3.3 V, 50 kHz, typ.) During shutdown: 0.5 μA (max.) • Duty ratio : 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) • External parts : Coil, capacitor, and diode • Output voltage : Selectable in 0.1 V steps between 1.5 V and 6.5 V (for VDD / VOUT separate types) Selectable in 0.1 V steps between 2.0 V and 6.5 V (for other than VDD / VOUT separate types) • Output voltage accuracy : ±2.4% • Oscillation frequency : 30 kHz, 50 kHz, and 250 kHz selectable • Soft start function : 6 ms (50 kHz, typ.) • Lead-free, Sn 100%, halogen-free*1 *1. Refer to “ Product Name Structure” for details. 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, VCRs, and communication devices • Power supplies for microcomputers Packages • SOT-23-3 • SOT-23-5 • SOT-89-3 |
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