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S-8358H50MC-NVJT2G

Description
switching controllers step-Up swr pwm/pfm 25.9ua Iq
Categorysemiconductor    Other integrated circuit (IC)   
File Size862KB,73 Pages
ManufacturerSeiko
Environmental Compliance
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S-8358H50MC-NVJT2G Overview

switching controllers step-Up swr pwm/pfm 25.9ua Iq

S-8355/56/57/58 Series
www.sii-ic.com
© Seiko Instruments Inc., 2002-2014
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.8.0
_00
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. (I
OUT
= 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 V
DD
/ V
OUT
separate types)
Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than V
DD
/ V
OUT
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
Seiko Instruments Inc.
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