S-8355 Seiko Instruments, S-8355 Datasheet

S-8355

Manufacturer Part Number

S-8355

Description

(S-8355 - S-8358) PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR

Manufacturer

Seiko Instruments

Datasheet

1.S-8355.pdf (76 pages)

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Rev.6.6

STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or

PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

Features

Applications

Packages

• Low voltage operation : Startup at 0.9 V min. (I

• Low current consumption : During operation 25.9 µA (3.3 V, 100 kHz, typ.)

• Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series)

• External parts : Coil, diode, capacitor, and transistor

• Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for V

• 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 products

• 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

SOT-23-3

SOT-23-5

SOT-89-3

6-Pin SNB(B)

Package Name

_00

15 to 83% (100 kHz models)

15 to 78% (250 kHz, 300 kHz, and 600 kHz models)

Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than V

During shutdown 0.5 µA (max.)

MP003-A

MP005-A

UP003-A

BD006-A

Package

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.

Seiko Instruments Inc.

OUT

= 1 mA) guaranteed

Drawing Code

MP003-A

MP005-A

UP003-A

BD006-A

Tape

/ V

OUT

S-8355/56/57/58 Series

separate types)

/ V

OUT

separate types)

MP003-A

MP005-A

UP003-A

BD006-A

Reel

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