S-8356 Datasheet | Seiko Instruments

S-8355/56/57/58 Series STEP-UP, SUPER-SMALL PACKAGE, 600 k Hz, PWM CONTROL or .sii-ic. PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER © 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 pensation 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 k Hz, 300 k Hz, and 600 k Hz models), an excellently designed error amplifier and a phase pensation 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. (IOUT = 1 m A) guaranteed - Low current consumption : During operation 25.9 μA (3.3 V, 100 k Hz, typ.) During shutdown 0.5 μA (max.) - Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series) 15 to 83% (100 k Hz models) 15 to 78% (250 k Hz, 300 k Hz, and 600 k Hz models) - External parts : Coil, diode, capacitor, and transistor - Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for VDD / VOUT separate types) Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than VDD / VOUT separate types) - Output voltage accuracy : ±2.4% - Oscillation frequency : 100 k Hz, 250 k Hz, 300 k Hz, 600 k Hz selectable - Soft start function : 6 ms (100 k Hz, typ.) - Shutdown function - Lead-free, Sn 100%, halogen-free- 1 - 1. Refer...