CRS08 datasheet(8/50 Pages) SII

Part #	CRS08

Description	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM / PFM SWITCHABLE SWITCHING REGULATOR

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Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR

S-8363 Series

Rev.2.0_01

8



Operation

1. Switching control method

The S-8363 Series switching regulator automatically switches between the pulse width modulation method (PWM)

and pulse frequency modulation method (PFM) according to the load current.

A low ripple power can be supplied by operating on PWM control for which the pulse width changes up to 88% in

the range where the output load current is large.

The S-8363 Series operates on PFM control when the output load current is small and the pulses are skipped

according to the amount of the load current. Therefore, the oscillation circuit intermittently oscillates, reducing the

self-current consumption. This prevents decrease in efficiency when the output load current is small. The ripple

voltage during the PFM control is very small, so that the S-8363 Series realizes high efficiency and the low-noise

power supply.

The point at which PWM control switches to PFM control varies depending on the external element (inductor, diode,

etc.), input voltage value, and output voltage value, and this method achieves high efficiency in the output load

current of about 100

μA.

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Manufacturer	Part #	Datasheet	Description
ABLIC Inc.	S-8363	792Kb / 50P	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM / PFM SWITCHABLE SWITCHING REGULATOR Rev.2.0_02
ABLIC Inc.	S-8365	1Mb / 63P	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.2.1_02
Seiko Instruments Inc	S8365	3Mb / 63P	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
	S-8365	1Mb / 63P	STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
	S8355	3Mb / 72P	STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
ABLIC Inc.	S-8355	853Kb / 72P	STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_02
Seiko Instruments Inc	S-8363B-I6T1U2	2Mb / 50P	PWM/PFM SWITCHABLE SWITCHING REGULATOR
	S-8321	1Mb / 26P	SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
	S8353	2Mb / 49P	STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
	S8340	3Mb / 55P	STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER