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, this product is ideal for applications requiring high efficiency and a high output current. The S-8365 Series efficiently works on voltage’s 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 µA 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 µA 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
- Lead-free product
Applications
- MP3 players, digital audio players
- Digital cameras, GPS, wireless transceiver
- Portable devices