Details, datasheet, quote on part number: S-8353AxxUA
PartS-8353AxxUA
CategoryPower Management => Regulators => Switching Regulators
DescriptionControl Method = Pwm, Pwm/pfm ;; Operation Start Voltage = 0.9V ;; Output Voltage = 1.5-6.5V (Vdd/Vout Sep.) 2.0-6.5V (the Others) ;; Output Accuracy = ±2.4% ;; Switching Frequency = 30, 50, 250 KHZ ;; Current Consumption Operating = 18.7 µA (3.3V, 50KHz) ;; Current Consumption Shutdown = 0.5 µA Max. ;; Efficiency Typ. = 85% ;; Package = SOT-23-5 SOT-23-3 SOT-89-3
CompanySeiko Instruments
DatasheetDownload S-8353AxxUA datasheet
  

 

Features, Applications

ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR

The S-8353/8354 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power MOS FET, an error amplifier, a phase compensation circuit, a PWM controller (S-8353 Series) and a PWM/PFM switching controller (S-8354 Series). Simply attaching a coil, capacitor, and diode externally can configure the step-up switching regulator. In addition to the above features, the small package and low power consumption of this series make it ideal for portable device applications requiring high efficiency. The S-8353 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM controller, which can vary the duty ratio linearly from 83 % (from 78 % for 250 kHz models), optimally-designed error amplifier, and phase compensation circuits. The S-8354 Series features a PWM/PFM switching controller that can switch the operation to a PFM controller with a duty ratio 15 % under a light load to prevent a decline in the efficiency due to the IC operating current.

Features

Low voltage operation: Low current consumption: Duty ratio: External parts: Output voltage: Oscillation frequency: Soft start function: Start-up is guaranteed from V (IOUT=1 mA) During operation: V, 50 kHz, typ.) During shutdown: 0.5 A (max.) Built-in PWM/PFM switching control circuit (S-8354 Series) % (30 kHz and 50 kHz models), % (250 kHz models) Coil, capacitor, and diode Can be set 0.1 V steps between 1.5 and 6.5 V (for VDD/VOUT separate types) or 2.0 and 6.5 V (for other than VDD/VOUT separate types). Accuracy 2.4%. 30 kHz, 50 kHz, and 250 kHz ms (50 kHz, typ.)

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, video equipment, and communications equipment Power supplies for microcomputers

Package name SOT-23-5 SOT-89-3 Package MP005-A UP003-A Drawing code Tape MP005-A UP003-A Reel MP005-A UP003-A

ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.1.2_00 S-8353/8354 Series Block Diagrams

C, H type (Without Shutdown Function) CONT VOUT Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit

Figure A, H type (With Shutdown Function) CONT VOUT Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit ON / OFF Figure D, J type CONT VDD Oscillation circuit IC internal power supply PWM control, + PWM/PFM switching - control circuit Soft start built-in Phase reference power compensation supply circuit Figure 3 VSS VOUT

ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR _00 S-8353/8354 Series

1. Function List Table 1 Product name Control system S-8354HxxUA S-8354JxxMC PWM PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching PWM/PFM switching Switching Shutdown VDD/VOUT frequency [kHz] function separate type Yes Package SOT-23-3 SOT-89-3 Application requiring shutdown function Application not requiring shutdown function Application not requiring shutdown function For pager Application in which output voltage is adjusted by external resistance Application requiring shutdown function and thin coil Application not requiring shutdown function and requiring thin coil Application not requiring shutdown function and requiring thin coil Application in which output voltage is adjusted by external resistance and that requires thin coil Application requiring shutdown function Application not requiring shutdown function Application not requiring shutdown function

SOT-23-3 For pager SOT-89-3 SOT-23-5 Application in which output voltage is adjusted by external resistance Application requiring shutdown function and thin coil Application not requiring shutdown function and requiring thin coil Application not requiring shutdown function and requiring thin coil Application in which output voltage is adjusted by external resistance and that requires thin coil


 

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