S-8365/8366 Series STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or www.ablic.com PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER www.ablicinc.com ABLIC Inc., 2009-2015 Rev.2.1 02 The S-8365/8366 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 timer latch short-circuit protection circuit, a PWM control circuit (S-8365 Series) and a PWM / PFM switching control circuit (S-8366 Series). With an external low-ON-resistance Nch Power MOS FET, this product is ideal for applications requiring high efficiency and a high output current. The S-8365 Series efficiently works on voltages condition of large I/O difference due to the PWM control circuit linearly varies the duty ratio to 90%. During light-load, the S-8366 Series switches its operation to the PFM control by the PWM / PFM switching control circuit in order to prevent efficiency decline due to the IC operating current. Ceramic capacitors can be used for output capacitor. Small packages SNT-6A, SOT-23-5 and SOT-23-6 enable high-density mounting. Features Low operation voltage : Start at 1.1 V (1 mA) guaranteed (in the product without UVLO function) Input voltage range : 1.8 V to 5.5 V Oscillation frequency : 1.2 MHz, 600 kHz Reference voltage : 0.6 V 2.0% Soft start function : 7 ms typ. Low current consumption : 70 A typ. at switching off Duty ratio : Built-in PWM / PFM switching control circuit (S-8366 Series) 28% to 85% (1.2 MHz product) 28% to 90% (600 kHz product) Shutdown function : Current consumption 1.0 A max. at shutdown External parts : Inductor, diode, capacitor, transistor Timer latch short-circuit protection circuit : Selectable with / without short-circuit protection circuit for each product Settable delay time by external capacitor (in the product with short-circuit protection) UVLO (under-voltage lockout) function : Selectable with / without UVLO for each product *1 Lead-free, Sn 100%, halogen-free *1. Refer to Product Name Structure for details. Applications MP3 players, digital audio players Digital cameras, GPS, wireless transceiver Portable devices Packages SNT-6A SOT-23-5 SOT-23-6 1 STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8365/8366 Series Rev.2.1 02 Block Diagram 1. With UVLO function and short-circuit protection L SD V OUT Triangular Wave UVLO VDD Oscillation Circuit PWM Comparator C Error FB PWM control, or Amplifier R FB1 M1 PWM / PFM Switching Control Circuit EXT FB R FB2 Timer Latch Short-Circuit Protection Reference Voltage ON/OFF with Soft-Start Circuit C V C OUT IN IN Circuit ON/OFF CSP VSS Figure 1 2. With UVLO function, without short-circuit protection L SD V OUT Triangular Wave UVLO Oscillation Circuit VDD Error C FB PWM Comparator Amplifier R FB1 M1 PWM control, or PWM / PFM Switching Control FB EXT R FB2 Circuit Reference Voltage ON/OFF V C with Soft-Start Circuit C IN IN OUT Circuit ON/OFF VSS Figure 2 2