S-8355/56/57/58 Series STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER www.sii-ic.com SII Semiconductor Corporation, 2002-2015 Rev.8.1 01 The S-8355/56/57/58 Series is a CMOS step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57 Series) and a PWM/PFM switching control circuit (S-8356/58 Series). With an external low-ON-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a high output current. The S-8355/57 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, 300 kHz, and 600 kHz models), an excellently designed error amplifier and a phase compensation circuits. S-8356/58 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. (I = 1 mA) guaranteed OUT Low current consumption : During operation 25.9 A (3.3 V, 100 kHz, typ.) During shutdown 0.5 A (max.) Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series) 15 to 83% (100 kHz models) 15 to 78% (250 kHz, 300 kHz, and 600 kHz models) External parts : Coil, diode, capacitor, and transistor Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for V / V separate types) DD OUT Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than V / V separate types) DD OUT Output voltage accuracy : 2.4% Oscillation frequency : 100 kHz, 250 kHz, 300 kHz, 600 kHz selectable Soft start function : 6 ms (100 kHz, typ.) Shutdown function *1 Lead-free, Sn 100%, halogen-free *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 communications devices Power supplies for microcomputers Packages SOT-23-3 SOT-23-5 SOT-89-3 1 STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8355/56/57/58 Series Rev.8.1 01 Block Diagrams (1) S-8357/58 Series B, H and F Types (2) S-8357/58 Series B, H, F and N Types (Without Shutdown Function) (With Shutdown Function) VOUT VOUT Oscillation circuit IC internal Oscillation circuit IC internal power power supply PWMcontrol circuit or supply + PWM / PFM switching + PWMcontrol circuit or EXT EXT control circuit PWM / PFM switching control circuit Soft start built-in Phase reference power compensation Soft start built-in Phase VSS supply circuit reference power compensation VSS supply circuit ON/ OFF Figure 1 Figure 2 (3) S-8357/58 Series E, J, G and P Types (4) S-8355/56 Series K, L, M and Q Types (V / V Separate Type) (With Shutdown Function, V / V Separate Type) DD OUT DD OUT VDD VOUT VDD VOUT IC internal IC internal Oscillation circuit power power Oscillation circuit supply supply PWMcontrol circuit or + EXT PWMcontrol circuit or PWM / PFM switching + EXT PWM / PFM switching control circuit control circuit Soft start built-in Phase reference power Soft start built-in Phase compensation VSS supply reference power compensation circuit VSS supply circuit ON/ OFF Figure 3 Figure 4 2