Switching Regulators 

精工的开关型稳压芯片能够高效率地将输入电压转变为另一种固定的输出电压。这一类别的产品提供三种变换方式：升压、降压、升/降压。PWM 方式是一种高效，低纹波，低噪声的控制方式；PFM 方式具有在低负载下获得较高效率的特性，PWM/PFM 切换型的控制方式能够在轻负载时采用PFM方式，重负载时自动切换为PWM，已获得更加优异的性能。

Type Model No. Control Method Operation Start Voltage Output Voltage Switching Frequency Current Consumption Operating Efficiency Typ. Package STEP-UP S-8355/56/57/58 series New PWM, PWM/PFM (External FET) 0.9V 1.5-6.5V (Vdd/Vout sep.) 2.0-6.5V (the others) 100, 250, 300, 600 KHz 25.9 µA (3.3 V, 100 KHz) 85% 6-pin SNB SOT-23-5 SOT-23-3 SOT-89-3 STEP-UP S-8353/8354 series PWM, PWM/PFM (Built-in FET) 0.9V 1.5-6.5V (Vdd/Vout sep.) 2.0-6.5V (the others) 30, 50, 250 KHz 18.7 µA (3.3V, 50KHz) 85% SOT-23-5 SOT-23-3 SOT-89-3 STEP-UP S-83M355/83M356 series New PWM, PWM/PFM (Built-in FET) 1.5V 2.0-15V (can be changed by an external resistor) 600 KHz 1.25 mA (Vout=Vout(s)×0.95) 85% PLP-8B STEP-UP S-8351/8352 series PFM (External FET) 0.9 V 2.0-6.5V (A, B, C) 1.5-6V (D) 100 KHz 23.2 µA (3.3V) 85% SOT-23-5 SOT-23-3 SOT-89-3 STEP-UP S-8337/8338 series New PWM (External FET) (Input 1.8 to 6.0 V) Desired output voltage via external resistor 286 KHz to 1.133 MHz via external resistor 400 µA (700KHz, VFB =0.95V) - 8-pin SON(A), 8-pin TSSOP STEP-UP S-8340/8341 series PWM, PWM/PFM (External FET) 0.9 V 2.5-6.0V 300, 600 KHz 350 µA (3.3V, 600KHz) 87% (Vout=5V) 8-pin TSSOP STEP-UP S-8333 series New 1-channel for LCD (External FET) (Input 1.8 to 6.0 V) Desired output voltage via external resistor 286 KHz to 1.133 MHz via external resistor 450 µA (700KHz, VFB =0.95V) - SNT-8A 8-pin TSSOP STEP-UP S-8335 series 3-channel for LCD (External FET) (Input 2.4-5V) Maximum 12.41-16.59V) 100 KHz 100 µA (Mode 1, Vbat=3V) 82% 24-pin TSSOP STEP-UP S-8330/8331 series 1-channel for LCD (External FET) (Input 2-9V) Maximum 20-30V 50, 180 KHz 100 µA (Vin=5V, 180KHz) 85% 8-pin SSOP STEP-DOWN S-8520/8521 series PWM, PWM/PFM (External FET) (Input 2.5 to 10/16 V) 1.5-6.0V 60, 180, 300 KHz 60 µA (180KHz) 21 µA (60KHz) 100 µA (300KHz) 93% SOT-23-5 STEP-DOWN S-8540/8541 series PWM, PWM/PFM (External FET) (Input 2.5-10 V) 1.5-6.0 V 300, 600 KHz 180 µA (600KHz) 140 µA (300KHz) 90% 8-pin MSOP STEP-DOWN S-8533 series PWM Syncronous (External FET) (Input 2.7-16 V) 1.25-6.0 V 300 KHz 30 µA 94% 8-pin TSSOP STEP-UP/DOWN S-8460 PWM (External FET) (Input 2.2-18 V) 2.5-6.0 V 300 KHz 75 µA (Step-down) 900 µA (Step-up) 87% (Step-down) 83% (Step-up) 16-pin TSSOP

　

　

Charge Pump ICs

SII charge pump ICs provide constant current, and step-up or step-down voltage with only 2 external capacitors. PC board size reduction is realized compared to DC/DC controllers that use choke coils. The S-8813 Series features 3-channel constant current output for white LEDs. The S-88x features step-up output, or step-down output.

Model No. Type Efficiency Operating Voltage Output Output Accuracy Switching Frequency Package Note S-8813 series 3-channel White LCD Driver 82% 2.7 to 4.5 V 5.0 to 18mA (Vout = 4V or less, Vin = 3V) ±5% 600 KHz 10-pin SON(B) For White LCD S-8821 series New Voltage regulation step-up 90% 1.6 to 5.0 V 2.5 to 5.5 V, 0.1 V steps ±2 % max. 1.0 MHz SOT-23-6W, 6-Pin SNB(B), 6-Pin SON(A) Output current 25 mA (Vin=(Vout(s) × 0.80) V)