S-8355K18MC-NADT2X Datasheet, PDF (1/72 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8355/56/57/58 Series
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or
www.sii-ic.com
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 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. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 25.9 μA (3.3 V, 100 kHz, typ.)
During shutdown 0.5 μA (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 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 kHz, 250 kHz, 300 kHz, 600 kHz selectable
• Soft start function : 6 ms (100 kHz, typ.)
• Shutdown function
• Lead-free, Sn 100%, halogen-free^*1
*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