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S8353

Seiko Instruments
Part Number S8353
Manufacturer Seiko Instruments
Description (S8353 / S8354) PWM Control Switchable Built-in Transistor Switching Regulator
Published Oct 17, 2007
Detailed Description www.DataSheet4U.com Rev.1.4_00 STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR S...
Datasheet PDF File S8353 PDF File

S8353
S8353

Overview
www.
DataSheet4U.
com Rev.
1.
4_00 STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR S-8353/8354 Series 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 control circuit (S-8353 Series) and a PWM / PFM switching control circuit (S-8354 Series).
The S-8353/8354 Series can configure the step-up switching regulator with an external coil, capacitor, and diode.
In addition to the above features, the small package and low current consumption make the S-8353/8354 Series ideal for portable equipment applications requiring high efficiency.
The S-8353 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 models), an excellently 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 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 18.
7 µA (3.
3 V, 50 kHz, typ.
) During shutdown: 0.
5 µA (max.
) • Duty ratio : Built-in PWM / PFM switching control circuit (S-8354 Series) 15 % to 83 % (30 kHz and 50 kHz models) 15 % to 78 % (250 kHz models) • External parts : Coil, capacitor, and diode • 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 : 30 kHz, 50 kHz, and 250 kHz selectable • Soft start function : 6 ms (50 kHz, typ.
) „ Applications • Power supplies fo...


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